[Bug 1896096] [NEW] Git version: Build process is broken in block_curl.c.o

[Bug 1896096] [NEW] Git version: Build process is broken in block_curl.c.o

[Frederic Bezies]

Public bug reported:

Gcc version: 10.2.0
Glusterfs: 8.1
Libguestfs: 1.42

Configure options used:

configure \
    --prefix=/usr \
    --sysconfdir=/etc \
    --localstatedir=/var \
    --libexecdir=/usr/lib/qemu \
    --extra-ldflags="$LDFLAGS" \
    --smbd=/usr/bin/smbd \
    --enable-modules \
    --enable-sdl \
    --disable-werror \
    --enable-slirp=system \
    --enable-xfsctl \
    --audio-drv-list="pa alsa sdl"
    
Error log attached. Here is the beginning:

/usr/bin/ld: /usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../lib/Scrt1.o: in function `_start':
(.text+0x24): undefined reference to `main'
/usr/bin/ld: libblock-curl.a(block_curl.c.o): in function `curl_block_init':

** Affects: qemu
     Importance: Undecided
         Status: New

** Attachment added: "Crash error log."
   https://bugs.launchpad.net/bugs/1896096/+attachment/5411766/+files/bug%20qemu%20log

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Title:
  Git version: Build process is broken in block_curl.c.o

Status in QEMU:
  New

Bug description:
  Gcc version: 10.2.0
  Glusterfs: 8.1
  Libguestfs: 1.42

  Configure options used:

  configure \
      --prefix=/usr \
      --sysconfdir=/etc \
      --localstatedir=/var \
      --libexecdir=/usr/lib/qemu \
      --extra-ldflags="$LDFLAGS" \
      --smbd=/usr/bin/smbd \
      --enable-modules \
      --enable-sdl \
      --disable-werror \
      --enable-slirp=system \
      --enable-xfsctl \
      --audio-drv-list="pa alsa sdl"
      
  Error log attached. Here is the beginning:

  /usr/bin/ld: /usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../lib/Scrt1.o: in function `_start':
  (.text+0x24): undefined reference to `main'
  /usr/bin/ld: libblock-curl.a(block_curl.c.o): in function `curl_block_init':

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[Bug 1896096] Re: Git version: Build process is broken in block_curl.c.o

[Daniel Berrange]

Please give more info on your host OS build environment, and most
importantly confirm that you have tried doing a build from a
*completely* clean git checkout. Recent build system changes introduced
risk of problems if you have not done a full clean. "git clean -f -x -d"
will delete every file in your git checkout that is not committed,
ensuring you are starting from a pristine checkout.

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Title:
  Git version: Build process is broken in block_curl.c.o

Status in QEMU:
  New

Bug description:
  Gcc version: 10.2.0
  Glusterfs: 8.1
  Libguestfs: 1.42

  Configure options used:

  configure \
      --prefix=/usr \
      --sysconfdir=/etc \
      --localstatedir=/var \
      --libexecdir=/usr/lib/qemu \
      --extra-ldflags="$LDFLAGS" \
      --smbd=/usr/bin/smbd \
      --enable-modules \
      --enable-sdl \
      --disable-werror \
      --enable-slirp=system \
      --enable-xfsctl \
      --audio-drv-list="pa alsa sdl"
      
  Error log attached. Here is the beginning:

  /usr/bin/ld: /usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../lib/Scrt1.o: in function `_start':
  (.text+0x24): undefined reference to `main'
  /usr/bin/ld: libblock-curl.a(block_curl.c.o): in function `curl_block_init':

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[Bug 1896096] Re: Git version: Build process is broken in block_curl.c.o

[Frederic Bezies]

I'm using Archlinux. Trying right now a build from scratch and I will
report asap. Keeping fingers crossed.

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Title:
  Git version: Build process is broken in block_curl.c.o

Status in QEMU:
  New

Bug description:
  Gcc version: 10.2.0
  Glusterfs: 8.1
  Libguestfs: 1.42

  Configure options used:

  configure \
      --prefix=/usr \
      --sysconfdir=/etc \
      --localstatedir=/var \
      --libexecdir=/usr/lib/qemu \
      --extra-ldflags="$LDFLAGS" \
      --smbd=/usr/bin/smbd \
      --enable-modules \
      --enable-sdl \
      --disable-werror \
      --enable-slirp=system \
      --enable-xfsctl \
      --audio-drv-list="pa alsa sdl"
      
  Error log attached. Here is the beginning:

  /usr/bin/ld: /usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../lib/Scrt1.o: in function `_start':
  (.text+0x24): undefined reference to `main'
  /usr/bin/ld: libblock-curl.a(block_curl.c.o): in function `curl_block_init':

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[Bug 1896096] Re: Git version: Build process is broken in block_curl.c.o

[Frederic Bezies]

Build process is still broken even with a blank new version of git
source code.


Once again, everything start while processing block_curl.so.

Here is the beginning of the error log:

Linking target block-curl.so
/usr/bin/ld: /usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../lib/Scrt1.o: in function `_start':
(.text+0x24): undefined reference to `main'
/usr/bin/ld: libblock-curl.a(block_curl.c.o): in function `curl_block_init':


Curl version: 7.72.0 if it matters.

Attaching error log.


** Attachment added: "Another error log with a clean source code."
   https://bugs.launchpad.net/qemu/+bug/1896096/+attachment/5412123/+files/qemu-error-log2

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Title:
  Git version: Build process is broken in block_curl.c.o

Status in QEMU:
  New

Bug description:
  Gcc version: 10.2.0
  Glusterfs: 8.1
  Libguestfs: 1.42

  Configure options used:

  configure \
      --prefix=/usr \
      --sysconfdir=/etc \
      --localstatedir=/var \
      --libexecdir=/usr/lib/qemu \
      --extra-ldflags="$LDFLAGS" \
      --smbd=/usr/bin/smbd \
      --enable-modules \
      --enable-sdl \
      --disable-werror \
      --enable-slirp=system \
      --enable-xfsctl \
      --audio-drv-list="pa alsa sdl"
      
  Error log attached. Here is the beginning:

  /usr/bin/ld: /usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../lib/Scrt1.o: in function `_start':
  (.text+0x24): undefined reference to `main'
  /usr/bin/ld: libblock-curl.a(block_curl.c.o): in function `curl_block_init':

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[Bug 1896096] Re: Git version: Build process is broken in block_curl.c.o

[Daniel Berrange]

Can you attach the full build log, including all the "configure" output,
and ideally pass  "V=1" as an arg to 'make'

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Title:
  Git version: Build process is broken in block_curl.c.o

Status in QEMU:
  New

Bug description:
  Gcc version: 10.2.0
  Glusterfs: 8.1
  Libguestfs: 1.42

  Configure options used:

  configure \
      --prefix=/usr \
      --sysconfdir=/etc \
      --localstatedir=/var \
      --libexecdir=/usr/lib/qemu \
      --extra-ldflags="$LDFLAGS" \
      --smbd=/usr/bin/smbd \
      --enable-modules \
      --enable-sdl \
      --disable-werror \
      --enable-slirp=system \
      --enable-xfsctl \
      --audio-drv-list="pa alsa sdl"
      
  Error log attached. Here is the beginning:

  /usr/bin/ld: /usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../lib/Scrt1.o: in function `_start':
  (.text+0x24): undefined reference to `main'
  /usr/bin/ld: libblock-curl.a(block_curl.c.o): in function `curl_block_init':

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[Bug 1896096] Re: Git version: Build process is broken in block_curl.c.o

[Frederic Bezies]

Full build log from start to crash.

** Attachment added: "qemu.log"
   https://bugs.launchpad.net/qemu/+bug/1896096/+attachment/5412152/+files/qemu.log

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Title:
  Git version: Build process is broken in block_curl.c.o

Status in QEMU:
  New

Bug description:
  Gcc version: 10.2.0
  Glusterfs: 8.1
  Libguestfs: 1.42

  Configure options used:

  configure \
      --prefix=/usr \
      --sysconfdir=/etc \
      --localstatedir=/var \
      --libexecdir=/usr/lib/qemu \
      --extra-ldflags="$LDFLAGS" \
      --smbd=/usr/bin/smbd \
      --enable-modules \
      --enable-sdl \
      --disable-werror \
      --enable-slirp=system \
      --enable-xfsctl \
      --audio-drv-list="pa alsa sdl"
      
  Error log attached. Here is the beginning:

  /usr/bin/ld: /usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../lib/Scrt1.o: in function `_start':
  (.text+0x24): undefined reference to `main'
  /usr/bin/ld: libblock-curl.a(block_curl.c.o): in function `curl_block_init':

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[Bug 1896096] Re: Git version: Build process is broken in block_curl.c.o

[Daniel Berrange]

Nothing looks especially unusual there, but clear it is failing to link
the block-curl.so as a library and is instead linking it as an
executable and thus failing to find "main". I can't explain why that
would be the case.

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Title:
  Git version: Build process is broken in block_curl.c.o

Status in QEMU:
  New

Bug description:
  Gcc version: 10.2.0
  Glusterfs: 8.1
  Libguestfs: 1.42

  Configure options used:

  configure \
      --prefix=/usr \
      --sysconfdir=/etc \
      --localstatedir=/var \
      --libexecdir=/usr/lib/qemu \
      --extra-ldflags="$LDFLAGS" \
      --smbd=/usr/bin/smbd \
      --enable-modules \
      --enable-sdl \
      --disable-werror \
      --enable-slirp=system \
      --enable-xfsctl \
      --audio-drv-list="pa alsa sdl"
      
  Error log attached. Here is the beginning:

  /usr/bin/ld: /usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../lib/Scrt1.o: in function `_start':
  (.text+0x24): undefined reference to `main'
  /usr/bin/ld: libblock-curl.a(block_curl.c.o): in function `curl_block_init':

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[Bug 1896096] Re: Git version: Build process is broken in block_curl.c.o

[Laurent Vivier]

>From log:
> The Meson build system
> Version: 0.55.3

Perhaps a(nother) problem with meson?

Try "meson=git"

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Title:
  Git version: Build process is broken in block_curl.c.o

Status in QEMU:
  New

Bug description:
  Gcc version: 10.2.0
  Glusterfs: 8.1
  Libguestfs: 1.42

  Configure options used:

  configure \
      --prefix=/usr \
      --sysconfdir=/etc \
      --localstatedir=/var \
      --libexecdir=/usr/lib/qemu \
      --extra-ldflags="$LDFLAGS" \
      --smbd=/usr/bin/smbd \
      --enable-modules \
      --enable-sdl \
      --disable-werror \
      --enable-slirp=system \
      --enable-xfsctl \
      --audio-drv-list="pa alsa sdl"
      
  Error log attached. Here is the beginning:

  /usr/bin/ld: /usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../lib/Scrt1.o: in function `_start':
  (.text+0x24): undefined reference to `main'
  /usr/bin/ld: libblock-curl.a(block_curl.c.o): in function `curl_block_init':

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[Bug 1896096] Re: Git version: Build process is broken in block_curl.c.o

[Daniel Berrange]

Added Paolo for his Meson expertize in case he can spot the flaw

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Title:
  Git version: Build process is broken in block_curl.c.o

Status in QEMU:
  New

Bug description:
  Gcc version: 10.2.0
  Glusterfs: 8.1
  Libguestfs: 1.42

  Configure options used:

  configure \
      --prefix=/usr \
      --sysconfdir=/etc \
      --localstatedir=/var \
      --libexecdir=/usr/lib/qemu \
      --extra-ldflags="$LDFLAGS" \
      --smbd=/usr/bin/smbd \
      --enable-modules \
      --enable-sdl \
      --disable-werror \
      --enable-slirp=system \
      --enable-xfsctl \
      --audio-drv-list="pa alsa sdl"
      
  Error log attached. Here is the beginning:

  /usr/bin/ld: /usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../lib/Scrt1.o: in function `_start':
  (.text+0x24): undefined reference to `main'
  /usr/bin/ld: libblock-curl.a(block_curl.c.o): in function `curl_block_init':

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[Bug 1896096] Re: Git version: Build process is broken in block_curl.c.o

[Frederic Bezies]

Tried meson-git, and it is still breaking on the same file. No luck
here.

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Title:
  Git version: Build process is broken in block_curl.c.o

Status in QEMU:
  New

Bug description:
  Gcc version: 10.2.0
  Glusterfs: 8.1
  Libguestfs: 1.42

  Configure options used:

  configure \
      --prefix=/usr \
      --sysconfdir=/etc \
      --localstatedir=/var \
      --libexecdir=/usr/lib/qemu \
      --extra-ldflags="$LDFLAGS" \
      --smbd=/usr/bin/smbd \
      --enable-modules \
      --enable-sdl \
      --disable-werror \
      --enable-slirp=system \
      --enable-xfsctl \
      --audio-drv-list="pa alsa sdl"
      
  Error log attached. Here is the beginning:

  /usr/bin/ld: /usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../lib/Scrt1.o: in function `_start':
  (.text+0x24): undefined reference to `main'
  /usr/bin/ld: libblock-curl.a(block_curl.c.o): in function `curl_block_init':

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[Bug 1896096] Re: Git version: Build process is broken in block_curl.c.o

[Daniel Berrange]

Can you do the build using  "make V=1" so that we actually see the
compiler command lines used in the log file.

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Title:
  Git version: Build process is broken in block_curl.c.o

Status in QEMU:
  New

Bug description:
  Gcc version: 10.2.0
  Glusterfs: 8.1
  Libguestfs: 1.42

  Configure options used:

  configure \
      --prefix=/usr \
      --sysconfdir=/etc \
      --localstatedir=/var \
      --libexecdir=/usr/lib/qemu \
      --extra-ldflags="$LDFLAGS" \
      --smbd=/usr/bin/smbd \
      --enable-modules \
      --enable-sdl \
      --disable-werror \
      --enable-slirp=system \
      --enable-xfsctl \
      --audio-drv-list="pa alsa sdl"
      
  Error log attached. Here is the beginning:

  /usr/bin/ld: /usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../lib/Scrt1.o: in function `_start':
  (.text+0x24): undefined reference to `main'
  /usr/bin/ld: libblock-curl.a(block_curl.c.o): in function `curl_block_init':

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[Bug 1896096] Re: Git version: Build process is broken in block_curl.c.o

[Frederic Bezies]

Log with make V=1 as requested.

** Attachment added: "qemuv1.log"
   https://bugs.launchpad.net/qemu/+bug/1896096/+attachment/5412193/+files/qemuv1.log

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Title:
  Git version: Build process is broken in block_curl.c.o

Status in QEMU:
  New

Bug description:
  Gcc version: 10.2.0
  Glusterfs: 8.1
  Libguestfs: 1.42

  Configure options used:

  configure \
      --prefix=/usr \
      --sysconfdir=/etc \
      --localstatedir=/var \
      --libexecdir=/usr/lib/qemu \
      --extra-ldflags="$LDFLAGS" \
      --smbd=/usr/bin/smbd \
      --enable-modules \
      --enable-sdl \
      --disable-werror \
      --enable-slirp=system \
      --enable-xfsctl \
      --audio-drv-list="pa alsa sdl"
      
  Error log attached. Here is the beginning:

  /usr/bin/ld: /usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../lib/Scrt1.o: in function `_start':
  (.text+0x24): undefined reference to `main'
  /usr/bin/ld: libblock-curl.a(block_curl.c.o): in function `curl_block_init':

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[Bug 1896096] Re: Git version: Build process is broken in block_curl.c.o

[Paolo Bonzini]

cc  -o block-curl.so  -Wl,--as-needed -Wl,--allow-shlib-undefined
-shared -fPIC -Wl,--start-group -Wl,-soname,block-curl.so -Wl,--whole-
archive libblock-curl.a -Wl,--no-whole-archive -Wl,--warn-common
-Wl,-z,relro -Wl,-z,now -m64 -Wl,-O1,--sort-common,--as-
needed,-z,relro,-z,now -fstack-protector-strong -O2 -g -fPIE -DPIE
-std=gnu99 -Wall -g -pie -Wl,-O1,--sort-common,--as-
needed,-z,relro,-z,now libmodule-common.a -lcurl -Wl,--export-dynamic
-pthread -lgmodule-2.0 -lglib-2.0 -lglib-2.0 -Wl,--end-group

It could be because of -pie overriding -shared.  You wrote that you have
--extra-ldflags="$LDFLAGS" but what is $LDFLAGS?

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Title:
  Git version: Build process is broken in block_curl.c.o

Status in QEMU:
  New

Bug description:
  Gcc version: 10.2.0
  Glusterfs: 8.1
  Libguestfs: 1.42

  Configure options used:

  configure \
      --prefix=/usr \
      --sysconfdir=/etc \
      --localstatedir=/var \
      --libexecdir=/usr/lib/qemu \
      --extra-ldflags="$LDFLAGS" \
      --smbd=/usr/bin/smbd \
      --enable-modules \
      --enable-sdl \
      --disable-werror \
      --enable-slirp=system \
      --enable-xfsctl \
      --audio-drv-list="pa alsa sdl"
      
  Error log attached. Here is the beginning:

  /usr/bin/ld: /usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../lib/Scrt1.o: in function `_start':
  (.text+0x24): undefined reference to `main'
  /usr/bin/ld: libblock-curl.a(block_curl.c.o): in function `curl_block_init':

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[Bug 1896096] Re: Git version: Build process is broken in block_curl.c.o

[Frederic Bezies]

When I looked at /etc/makepkg.conf on my Archlinux, I found;
LDFLAGS="-Wl,-O1,--sort-common,--as-needed,-z,relro,-z,now"

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Title:
  Git version: Build process is broken in block_curl.c.o

Status in QEMU:
  New

Bug description:
  Gcc version: 10.2.0
  Glusterfs: 8.1
  Libguestfs: 1.42

  Configure options used:

  configure \
      --prefix=/usr \
      --sysconfdir=/etc \
      --localstatedir=/var \
      --libexecdir=/usr/lib/qemu \
      --extra-ldflags="$LDFLAGS" \
      --smbd=/usr/bin/smbd \
      --enable-modules \
      --enable-sdl \
      --disable-werror \
      --enable-slirp=system \
      --enable-xfsctl \
      --audio-drv-list="pa alsa sdl"
      
  Error log attached. Here is the beginning:

  /usr/bin/ld: /usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../lib/Scrt1.o: in function `_start':
  (.text+0x24): undefined reference to `main'
  /usr/bin/ld: libblock-curl.a(block_curl.c.o): in function `curl_block_init':

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[Bug 1896096] Re: Git version: Build process is broken in block_curl.c.o

[Paolo Bonzini]

Please attach config-host.mak and config.log.  Hopefully that is enough
to blame one of you, :) configure, meson.build or Meson itself.

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Title:
  Git version: Build process is broken in block_curl.c.o

Status in QEMU:
  New

Bug description:
  Gcc version: 10.2.0
  Glusterfs: 8.1
  Libguestfs: 1.42

  Configure options used:

  configure \
      --prefix=/usr \
      --sysconfdir=/etc \
      --localstatedir=/var \
      --libexecdir=/usr/lib/qemu \
      --extra-ldflags="$LDFLAGS" \
      --smbd=/usr/bin/smbd \
      --enable-modules \
      --enable-sdl \
      --disable-werror \
      --enable-slirp=system \
      --enable-xfsctl \
      --audio-drv-list="pa alsa sdl"
      
  Error log attached. Here is the beginning:

  /usr/bin/ld: /usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../lib/Scrt1.o: in function `_start':
  (.text+0x24): undefined reference to `main'
  /usr/bin/ld: libblock-curl.a(block_curl.c.o): in function `curl_block_init':

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[Bug 1896096] Re: Git version: Build process is broken in block_curl.c.o

[Frederic Bezies]

** Attachment added: "config.log asked for"
   https://bugs.launchpad.net/qemu/+bug/1896096/+attachment/5412210/+files/config.log

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Title:
  Git version: Build process is broken in block_curl.c.o

Status in QEMU:
  New

Bug description:
  Gcc version: 10.2.0
  Glusterfs: 8.1
  Libguestfs: 1.42

  Configure options used:

  configure \
      --prefix=/usr \
      --sysconfdir=/etc \
      --localstatedir=/var \
      --libexecdir=/usr/lib/qemu \
      --extra-ldflags="$LDFLAGS" \
      --smbd=/usr/bin/smbd \
      --enable-modules \
      --enable-sdl \
      --disable-werror \
      --enable-slirp=system \
      --enable-xfsctl \
      --audio-drv-list="pa alsa sdl"
      
  Error log attached. Here is the beginning:

  /usr/bin/ld: /usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../lib/Scrt1.o: in function `_start':
  (.text+0x24): undefined reference to `main'
  /usr/bin/ld: libblock-curl.a(block_curl.c.o): in function `curl_block_init':

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[Bug 1896096] Re: Git version: Build process is broken in block_curl.c.o

[Frederic Bezies]

** Attachment added: "config-host.mak asked for"
   https://bugs.launchpad.net/qemu/+bug/1896096/+attachment/5412211/+files/config-host.mak

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Title:
  Git version: Build process is broken in block_curl.c.o

Status in QEMU:
  New

Bug description:
  Gcc version: 10.2.0
  Glusterfs: 8.1
  Libguestfs: 1.42

  Configure options used:

  configure \
      --prefix=/usr \
      --sysconfdir=/etc \
      --localstatedir=/var \
      --libexecdir=/usr/lib/qemu \
      --extra-ldflags="$LDFLAGS" \
      --smbd=/usr/bin/smbd \
      --enable-modules \
      --enable-sdl \
      --disable-werror \
      --enable-slirp=system \
      --enable-xfsctl \
      --audio-drv-list="pa alsa sdl"
      
  Error log attached. Here is the beginning:

  /usr/bin/ld: /usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../lib/Scrt1.o: in function `_start':
  (.text+0x24): undefined reference to `main'
  /usr/bin/ld: libblock-curl.a(block_curl.c.o): in function `curl_block_init':

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[Bug 1896096] Re: Git version: Build process is broken in block_curl.c.o

[Daniel Berrange]

The problem is caused by the extra flags you're forcing on the compiler:

Using 'CFLAGS' from environment with value: '-O2 -g -fPIE -DPIE -std=gnu99 -Wall'
Using 'LDFLAGS' from environment with value: '-g -pie -Wl,-O1,--sort-common,--as-needed,-z,relro,-z,now'
Using 'CPPFLAGS' from environment with value: '-D_FORTIFY_SOURCE=2'

Most particularly the "-pie" in LDFLAGS.  This is only valid for
executables, not shared libraries, and thus it breaks the build.

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Title:
  Git version: Build process is broken in block_curl.c.o

Status in QEMU:
  New

Bug description:
  Gcc version: 10.2.0
  Glusterfs: 8.1
  Libguestfs: 1.42

  Configure options used:

  configure \
      --prefix=/usr \
      --sysconfdir=/etc \
      --localstatedir=/var \
      --libexecdir=/usr/lib/qemu \
      --extra-ldflags="$LDFLAGS" \
      --smbd=/usr/bin/smbd \
      --enable-modules \
      --enable-sdl \
      --disable-werror \
      --enable-slirp=system \
      --enable-xfsctl \
      --audio-drv-list="pa alsa sdl"
      
  Error log attached. Here is the beginning:

  /usr/bin/ld: /usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../lib/Scrt1.o: in function `_start':
  (.text+0x24): undefined reference to `main'
  /usr/bin/ld: libblock-curl.a(block_curl.c.o): in function `curl_block_init':

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[Bug 1896096] Re: Git version: Build process is broken in block_curl.c.o

[Frederic Bezies]

I used these settings until Qemu 5.1.0 was released and it worked. These
flags are used by archlinux for stable qemu release packaging.

See https://github.com/archlinux/svntogit-
packages/blob/packages/qemu/trunk/PKGBUILD

Since qemu moved to meson, it breaks. I don't know why it used to work
before. Thanks for your answer anyway.

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Title:
  Git version: Build process is broken in block_curl.c.o

Status in QEMU:
  New

Bug description:
  Gcc version: 10.2.0
  Glusterfs: 8.1
  Libguestfs: 1.42

  Configure options used:

  configure \
      --prefix=/usr \
      --sysconfdir=/etc \
      --localstatedir=/var \
      --libexecdir=/usr/lib/qemu \
      --extra-ldflags="$LDFLAGS" \
      --smbd=/usr/bin/smbd \
      --enable-modules \
      --enable-sdl \
      --disable-werror \
      --enable-slirp=system \
      --enable-xfsctl \
      --audio-drv-list="pa alsa sdl"
      
  Error log attached. Here is the beginning:

  /usr/bin/ld: /usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../lib/Scrt1.o: in function `_start':
  (.text+0x24): undefined reference to `main'
  /usr/bin/ld: libblock-curl.a(block_curl.c.o): in function `curl_block_init':

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[Bug 1896096] Re: Git version: Build process is broken in block_curl.c.o

[Daniel Berrange]

FYI, QEMU automatically enables PIC/PIE as needed, so there's no need to
set it via these flags.

In fact everything in your $CFLAGS is already set by QEMU out of the box
too.

For LDFLAGS you can cull the -g and -pie

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Title:
  Git version: Build process is broken in block_curl.c.o

Status in QEMU:
  Invalid

Bug description:
  Gcc version: 10.2.0
  Glusterfs: 8.1
  Libguestfs: 1.42

  Configure options used:

  configure \
      --prefix=/usr \
      --sysconfdir=/etc \
      --localstatedir=/var \
      --libexecdir=/usr/lib/qemu \
      --extra-ldflags="$LDFLAGS" \
      --smbd=/usr/bin/smbd \
      --enable-modules \
      --enable-sdl \
      --disable-werror \
      --enable-slirp=system \
      --enable-xfsctl \
      --audio-drv-list="pa alsa sdl"
      
  Error log attached. Here is the beginning:

  /usr/bin/ld: /usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../lib/Scrt1.o: in function `_start':
  (.text+0x24): undefined reference to `main'
  /usr/bin/ld: libblock-curl.a(block_curl.c.o): in function `curl_block_init':

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[Bug 1896096] Re: Git version: Build process is broken in block_curl.c.o

[Daniel Berrange]

Before the meson port, the  "-pie" arg was on the CLI *before* the
"-shared" arg so the "-shared" wins and results in a shared library.

After the meson port, "-shared" appears first, and so "-pie" wins and
tries to create an executable.

IOW, this passing of -pie was always wrong, and it was only by luck that
it didn't break the build before.

** Changed in: qemu
       Status: New => Invalid

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Title:
  Git version: Build process is broken in block_curl.c.o

Status in QEMU:
  Invalid

Bug description:
  Gcc version: 10.2.0
  Glusterfs: 8.1
  Libguestfs: 1.42

  Configure options used:

  configure \
      --prefix=/usr \
      --sysconfdir=/etc \
      --localstatedir=/var \
      --libexecdir=/usr/lib/qemu \
      --extra-ldflags="$LDFLAGS" \
      --smbd=/usr/bin/smbd \
      --enable-modules \
      --enable-sdl \
      --disable-werror \
      --enable-slirp=system \
      --enable-xfsctl \
      --audio-drv-list="pa alsa sdl"
      
  Error log attached. Here is the beginning:

  /usr/bin/ld: /usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../lib/Scrt1.o: in function `_start':
  (.text+0x24): undefined reference to `main'
  /usr/bin/ld: libblock-curl.a(block_curl.c.o): in function `curl_block_init':

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[Bug 1896096] Re: Git version: Build process is broken in block_curl.c.o

[Frederic Bezies]

So, I'll try to tweak LDFLAGS and if it doesn't work, well... That's
life. Thanks for the infos.

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Title:
  Git version: Build process is broken in block_curl.c.o

Status in QEMU:
  Invalid

Bug description:
  Gcc version: 10.2.0
  Glusterfs: 8.1
  Libguestfs: 1.42

  Configure options used:

  configure \
      --prefix=/usr \
      --sysconfdir=/etc \
      --localstatedir=/var \
      --libexecdir=/usr/lib/qemu \
      --extra-ldflags="$LDFLAGS" \
      --smbd=/usr/bin/smbd \
      --enable-modules \
      --enable-sdl \
      --disable-werror \
      --enable-slirp=system \
      --enable-xfsctl \
      --audio-drv-list="pa alsa sdl"
      
  Error log attached. Here is the beginning:

  /usr/bin/ld: /usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../lib/Scrt1.o: in function `_start':
  (.text+0x24): undefined reference to `main'
  /usr/bin/ld: libblock-curl.a(block_curl.c.o): in function `curl_block_init':

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[Bug 1896096] Re: Git version: Build process is broken in block_curl.c.o

[Frederic Bezies]

Even with LDFLAGS tweaking, it breaks. Anyway, thanks for your help
here.

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Title:
  Git version: Build process is broken in block_curl.c.o

Status in QEMU:
  Invalid

Bug description:
  Gcc version: 10.2.0
  Glusterfs: 8.1
  Libguestfs: 1.42

  Configure options used:

  configure \
      --prefix=/usr \
      --sysconfdir=/etc \
      --localstatedir=/var \
      --libexecdir=/usr/lib/qemu \
      --extra-ldflags="$LDFLAGS" \
      --smbd=/usr/bin/smbd \
      --enable-modules \
      --enable-sdl \
      --disable-werror \
      --enable-slirp=system \
      --enable-xfsctl \
      --audio-drv-list="pa alsa sdl"
      
  Error log attached. Here is the beginning:

  /usr/bin/ld: /usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../lib/Scrt1.o: in function `_start':
  (.text+0x24): undefined reference to `main'
  /usr/bin/ld: libblock-curl.a(block_curl.c.o): in function `curl_block_init':

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Re: [Bug 1896096] Re: Git version: Build process is broken in block_curl.c.o

[Paolo Bonzini]

What's your new configure command line? Attach the config.log and make V=1
log again please.

That said, I noticed that the flags were included twice in the linker
command line so maybe you've only removed them in one place.

Il ven 18 set 2020, 18:20 Frederic Bezies <1896096@bugs.launchpad.net> ha
scritto:

> Even with LDFLAGS tweaking, it breaks. Anyway, thanks for your help
> here.
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1896096
>
> Title:
>   Git version: Build process is broken in block_curl.c.o
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/qemu/+bug/1896096/+subscriptions
>
>

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Title:
  Git version: Build process is broken in block_curl.c.o

Status in QEMU:
  Invalid

Bug description:
  Gcc version: 10.2.0
  Glusterfs: 8.1
  Libguestfs: 1.42

  Configure options used:

  configure \
      --prefix=/usr \
      --sysconfdir=/etc \
      --localstatedir=/var \
      --libexecdir=/usr/lib/qemu \
      --extra-ldflags="$LDFLAGS" \
      --smbd=/usr/bin/smbd \
      --enable-modules \
      --enable-sdl \
      --disable-werror \
      --enable-slirp=system \
      --enable-xfsctl \
      --audio-drv-list="pa alsa sdl"
      
  Error log attached. Here is the beginning:

  /usr/bin/ld: /usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../lib/Scrt1.o: in function `_start':
  (.text+0x24): undefined reference to `main'
  /usr/bin/ld: libblock-curl.a(block_curl.c.o): in function `curl_block_init':

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[Bug 1896096] Re: Git version: Build process is broken in block_curl.c.o

[Daniel Berrange]

FWIW, I reproduced the original failure using your LDFLAGS, and tested
that removing '-pie' made it work

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Title:
  Git version: Build process is broken in block_curl.c.o

Status in QEMU:
  Invalid

Bug description:
  Gcc version: 10.2.0
  Glusterfs: 8.1
  Libguestfs: 1.42

  Configure options used:

  configure \
      --prefix=/usr \
      --sysconfdir=/etc \
      --localstatedir=/var \
      --libexecdir=/usr/lib/qemu \
      --extra-ldflags="$LDFLAGS" \
      --smbd=/usr/bin/smbd \
      --enable-modules \
      --enable-sdl \
      --disable-werror \
      --enable-slirp=system \
      --enable-xfsctl \
      --audio-drv-list="pa alsa sdl"
      
  Error log attached. Here is the beginning:

  /usr/bin/ld: /usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../lib/Scrt1.o: in function `_start':
  (.text+0x24): undefined reference to `main'
  /usr/bin/ld: libblock-curl.a(block_curl.c.o): in function `curl_block_init':

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[Bug 1896096] Re: Git version: Build process is broken in block_curl.c.o

[Frederic Bezies]

Configure line: configure \
    --prefix=/usr \
    --sysconfdir=/etc \
    --localstatedir=/var \
    --libexecdir=/usr/lib/qemu \
    --smbd=/usr/bin/smbd \
    --extra-ldflags="-Wl,-O1,--sort-common,--as-needed,-z,relro,-z,now" \
    --enable-modules \
    --enable-sdl \
    --disable-werror \
    --enable-slirp=system \
    --enable-xfsctl \
    --audio-drv-list="pa alsa sdl"

** Attachment added: "config.log"
   https://bugs.launchpad.net/qemu/+bug/1896096/+attachment/5412259/+files/config.log

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Title:
  Git version: Build process is broken in block_curl.c.o

Status in QEMU:
  Invalid

Bug description:
  Gcc version: 10.2.0
  Glusterfs: 8.1
  Libguestfs: 1.42

  Configure options used:

  configure \
      --prefix=/usr \
      --sysconfdir=/etc \
      --localstatedir=/var \
      --libexecdir=/usr/lib/qemu \
      --extra-ldflags="$LDFLAGS" \
      --smbd=/usr/bin/smbd \
      --enable-modules \
      --enable-sdl \
      --disable-werror \
      --enable-slirp=system \
      --enable-xfsctl \
      --audio-drv-list="pa alsa sdl"
      
  Error log attached. Here is the beginning:

  /usr/bin/ld: /usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../lib/Scrt1.o: in function `_start':
  (.text+0x24): undefined reference to `main'
  /usr/bin/ld: libblock-curl.a(block_curl.c.o): in function `curl_block_init':

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[Bug 1896096] Re: Git version: Build process is broken in block_curl.c.o

[Frederic Bezies]

And qemu log build using make -V=1.

Hope it helps.

** Attachment added: "qemuv1-2.log"
   https://bugs.launchpad.net/qemu/+bug/1896096/+attachment/5412260/+files/qemuv1-2.log

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Title:
  Git version: Build process is broken in block_curl.c.o

Status in QEMU:
  Invalid

Bug description:
  Gcc version: 10.2.0
  Glusterfs: 8.1
  Libguestfs: 1.42

  Configure options used:

  configure \
      --prefix=/usr \
      --sysconfdir=/etc \
      --localstatedir=/var \
      --libexecdir=/usr/lib/qemu \
      --extra-ldflags="$LDFLAGS" \
      --smbd=/usr/bin/smbd \
      --enable-modules \
      --enable-sdl \
      --disable-werror \
      --enable-slirp=system \
      --enable-xfsctl \
      --audio-drv-list="pa alsa sdl"
      
  Error log attached. Here is the beginning:

  /usr/bin/ld: /usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../lib/Scrt1.o: in function `_start':
  (.text+0x24): undefined reference to `main'
  /usr/bin/ld: libblock-curl.a(block_curl.c.o): in function `curl_block_init':

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Re: [Bug 1896096] Re: Git version: Build process is broken in block_curl.c.o

[Paolo Bonzini]

You have to unset LDFLAGS, or remove -pie. Specifying --extra-ldflags is
useless because Meson already obeys the LDFLAGS environment variable.

Il ven 18 set 2020, 19:11 Frederic Bezies <1896096@bugs.launchpad.net> ha
scritto:

> And qemu log build using make -V=1.
>
> Hope it helps.
>
> ** Attachment added: "qemuv1-2.log"
>
> https://bugs.launchpad.net/qemu/+bug/1896096/+attachment/5412260/+files/qemuv1-2.log
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1896096
>
> Title:
>   Git version: Build process is broken in block_curl.c.o
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/qemu/+bug/1896096/+subscriptions
>
>

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Title:
  Git version: Build process is broken in block_curl.c.o

Status in QEMU:
  Invalid

Bug description:
  Gcc version: 10.2.0
  Glusterfs: 8.1
  Libguestfs: 1.42

  Configure options used:

  configure \
      --prefix=/usr \
      --sysconfdir=/etc \
      --localstatedir=/var \
      --libexecdir=/usr/lib/qemu \
      --extra-ldflags="$LDFLAGS" \
      --smbd=/usr/bin/smbd \
      --enable-modules \
      --enable-sdl \
      --disable-werror \
      --enable-slirp=system \
      --enable-xfsctl \
      --audio-drv-list="pa alsa sdl"
      
  Error log attached. Here is the beginning:

  /usr/bin/ld: /usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../lib/Scrt1.o: in function `_start':
  (.text+0x24): undefined reference to `main'
  /usr/bin/ld: libblock-curl.a(block_curl.c.o): in function `curl_block_init':

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[Bug 1896096] Re: Git version: Build process is broken in block_curl.c.o

[Toolybird]

Chiming in here as the user who initially suggested Arch use this:

--extra-ldflags="$LDFLAGS"

qemu-5.0.0 introduced a breaking change whereby LDFLAGS from the
environment were ignored. For Arch, this resulted in exclusion of `--as-
needed' from the link, which naturally caused dependency chaos.

The Arch Build System globally sets CFLAGS and LDFLAGS in the build
environment to try and ensure all pkgs are built to distro standards.
The build systems for most pkgs in the distro respect FLAGS from the
environment.

When qemu-5.2.0 is released, Arch will obviously need to adapt to
account for Meson changes.

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Title:
  Git version: Build process is broken in block_curl.c.o

Status in QEMU:
  Invalid

Bug description:
  Gcc version: 10.2.0
  Glusterfs: 8.1
  Libguestfs: 1.42

  Configure options used:

  configure \
      --prefix=/usr \
      --sysconfdir=/etc \
      --localstatedir=/var \
      --libexecdir=/usr/lib/qemu \
      --extra-ldflags="$LDFLAGS" \
      --smbd=/usr/bin/smbd \
      --enable-modules \
      --enable-sdl \
      --disable-werror \
      --enable-slirp=system \
      --enable-xfsctl \
      --audio-drv-list="pa alsa sdl"
      
  Error log attached. Here is the beginning:

  /usr/bin/ld: /usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../lib/Scrt1.o: in function `_start':
  (.text+0x24): undefined reference to `main'
  /usr/bin/ld: libblock-curl.a(block_curl.c.o): in function `curl_block_init':

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[Bug 1896096] Re: Git version: Build process is broken in block_curl.c.o

[Peter Maydell]

Huh. I thought we ignored the environment LDFLAGS/CFLAGS from much
earlier than 5.0 and was about to ask if honouring it was a change
introduced with the Meson switch! My (not necessarily very considered)
opinion is that generally it's better not to honour the environment
CFLAGS and LDFLAGS because they can have all sorts of random stuff in
them that just doesn't work in complicated cases like QEMU, as in this
example where they included "-pie". --extra-ldflags has the semantics of
"add these on top of whatever the standard set of QEMU build flags is"
so the user doesn't need to try to specify absolutely everything, and
it's clear from the configure line that extra non-default options are
being added.

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Title:
  Git version: Build process is broken in block_curl.c.o

Status in QEMU:
  Invalid

Bug description:
  Gcc version: 10.2.0
  Glusterfs: 8.1
  Libguestfs: 1.42

  Configure options used:

  configure \
      --prefix=/usr \
      --sysconfdir=/etc \
      --localstatedir=/var \
      --libexecdir=/usr/lib/qemu \
      --extra-ldflags="$LDFLAGS" \
      --smbd=/usr/bin/smbd \
      --enable-modules \
      --enable-sdl \
      --disable-werror \
      --enable-slirp=system \
      --enable-xfsctl \
      --audio-drv-list="pa alsa sdl"
      
  Error log attached. Here is the beginning:

  /usr/bin/ld: /usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../lib/Scrt1.o: in function `_start':
  (.text+0x24): undefined reference to `main'
  /usr/bin/ld: libblock-curl.a(block_curl.c.o): in function `curl_block_init':

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[Bug 1896096] Re: Git version: Build process is broken in block_curl.c.o

[Frederic Bezies]

Just for your information, I added this before configure and it is still
broken: export LDFLAGS="-Wl,-O1,--sort-common,--as-
needed,-z,relro,-z,now"


I think I'll wait until Qemu 5.2.0 is released to see how Archlinux will fix this annoying behaviour.

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Title:
  Git version: Build process is broken in block_curl.c.o

Status in QEMU:
  Invalid

Bug description:
  Gcc version: 10.2.0
  Glusterfs: 8.1
  Libguestfs: 1.42

  Configure options used:

  configure \
      --prefix=/usr \
      --sysconfdir=/etc \
      --localstatedir=/var \
      --libexecdir=/usr/lib/qemu \
      --extra-ldflags="$LDFLAGS" \
      --smbd=/usr/bin/smbd \
      --enable-modules \
      --enable-sdl \
      --disable-werror \
      --enable-slirp=system \
      --enable-xfsctl \
      --audio-drv-list="pa alsa sdl"
      
  Error log attached. Here is the beginning:

  /usr/bin/ld: /usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../lib/Scrt1.o: in function `_start':
  (.text+0x24): undefined reference to `main'
  /usr/bin/ld: libblock-curl.a(block_curl.c.o): in function `curl_block_init':

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[Bug 1896096] Re: Git version: Build process is broken in block_curl.c.o

[Paolo Bonzini]

You can include the output of the build to help debugging this further
failure.

LDFLAGS has legitimate used but I think it would make sense to fail
configure if LDFLAGS contains -pie. Perhaps Meson could do so as well.

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Title:
  Git version: Build process is broken in block_curl.c.o

Status in QEMU:
  Invalid

Bug description:
  Gcc version: 10.2.0
  Glusterfs: 8.1
  Libguestfs: 1.42

  Configure options used:

  configure \
      --prefix=/usr \
      --sysconfdir=/etc \
      --localstatedir=/var \
      --libexecdir=/usr/lib/qemu \
      --extra-ldflags="$LDFLAGS" \
      --smbd=/usr/bin/smbd \
      --enable-modules \
      --enable-sdl \
      --disable-werror \
      --enable-slirp=system \
      --enable-xfsctl \
      --audio-drv-list="pa alsa sdl"
      
  Error log attached. Here is the beginning:

  /usr/bin/ld: /usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../lib/Scrt1.o: in function `_start':
  (.text+0x24): undefined reference to `main'
  /usr/bin/ld: libblock-curl.a(block_curl.c.o): in function `curl_block_init':

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[Bug 1896096] Re: Git version: Build process is broken in block_curl.c.o

[Frederic Bezies]

Building log while settings LDFLAGS as is:  export LDFLAGS="-Wl,-O1
,--sort-common,--as-needed,-z,relro,-z,now"

** Attachment added: "qemuv1-2.log"
   https://bugs.launchpad.net/qemu/+bug/1896096/+attachment/5412418/+files/qemuv1-2.log

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Title:
  Git version: Build process is broken in block_curl.c.o

Status in QEMU:
  Invalid

Bug description:
  Gcc version: 10.2.0
  Glusterfs: 8.1
  Libguestfs: 1.42

  Configure options used:

  configure \
      --prefix=/usr \
      --sysconfdir=/etc \
      --localstatedir=/var \
      --libexecdir=/usr/lib/qemu \
      --extra-ldflags="$LDFLAGS" \
      --smbd=/usr/bin/smbd \
      --enable-modules \
      --enable-sdl \
      --disable-werror \
      --enable-slirp=system \
      --enable-xfsctl \
      --audio-drv-list="pa alsa sdl"
      
  Error log attached. Here is the beginning:

  /usr/bin/ld: /usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../lib/Scrt1.o: in function `_start':
  (.text+0x24): undefined reference to `main'
  /usr/bin/ld: libblock-curl.a(block_curl.c.o): in function `curl_block_init':

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Re: [Bug 1896096] Re: Git version: Build process is broken in block_curl.c.o

[Paolo Bonzini]

Nope, something is overriding your LDFLAGS and adding -pie back. Please
open a bug on Arch, if they want to enable PIE by default they can do it in
gcc and binutils.

Adding -pie to LDFLAGS is as nonsensical as adding -shared.

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Title:
  Git version: Build process is broken in block_curl.c.o

Status in QEMU:
  Invalid

Bug description:
  Gcc version: 10.2.0
  Glusterfs: 8.1
  Libguestfs: 1.42

  Configure options used:

  configure \
      --prefix=/usr \
      --sysconfdir=/etc \
      --localstatedir=/var \
      --libexecdir=/usr/lib/qemu \
      --extra-ldflags="$LDFLAGS" \
      --smbd=/usr/bin/smbd \
      --enable-modules \
      --enable-sdl \
      --disable-werror \
      --enable-slirp=system \
      --enable-xfsctl \
      --audio-drv-list="pa alsa sdl"
      
  Error log attached. Here is the beginning:

  /usr/bin/ld: /usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../lib/Scrt1.o: in function `_start':
  (.text+0x24): undefined reference to `main'
  /usr/bin/ld: libblock-curl.a(block_curl.c.o): in function `curl_block_init':

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[Bug 1896096] Re: Git version: Build process is broken in block_curl.c.o

[Frederic Bezies]

Well, I'll wait until qemu 5.2.0 is released to see how archlinux work
around this problem. Thanks anyway for your help.

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Title:
  Git version: Build process is broken in block_curl.c.o

Status in QEMU:
  Invalid

Bug description:
  Gcc version: 10.2.0
  Glusterfs: 8.1
  Libguestfs: 1.42

  Configure options used:

  configure \
      --prefix=/usr \
      --sysconfdir=/etc \
      --localstatedir=/var \
      --libexecdir=/usr/lib/qemu \
      --extra-ldflags="$LDFLAGS" \
      --smbd=/usr/bin/smbd \
      --enable-modules \
      --enable-sdl \
      --disable-werror \
      --enable-slirp=system \
      --enable-xfsctl \
      --audio-drv-list="pa alsa sdl"
      
  Error log attached. Here is the beginning:

  /usr/bin/ld: /usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../lib/Scrt1.o: in function `_start':
  (.text+0x24): undefined reference to `main'
  /usr/bin/ld: libblock-curl.a(block_curl.c.o): in function `curl_block_init':

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[Bug 1896096] Re: Git version: Build process is broken in block_curl.c.o

[Toolybird]

Looking deeper into this... I believe there are indeed qemu bugs here.

It's actually the qemu configure script which is adding `-pie'

$ echo $LDFLAGS
-Wl,-O1,--sort-common,--as-needed,-z,relro,-z,now

Yet meson-logs/meson-log.txt tells me that:

Using 'LDFLAGS' from environment with value: '-g -pie -Wl,-O1,--sort-
common,--as-needed,-z,relro,-z,now'

Where did the `-pie' come from? Answer: the qemu configure script!

https://git.qemu.org/?p=qemu.git;a=blob;f=configure;h=756447900855e0b886ec6eb4e6b6aecf48c20a97;hb=HEAD#l2250

Simply unsetting LDFLAGS allows the build to complete successfully.

Not only that, qemu is now ignoring my user supplied CFLAGS from the
environment. I haven't analysed this one yet but I'm starting to realise
this hybrid meson/configure script approach is quite complicated.

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Title:
  Git version: Build process is broken in block_curl.c.o

Status in QEMU:
  Invalid

Bug description:
  Gcc version: 10.2.0
  Glusterfs: 8.1
  Libguestfs: 1.42

  Configure options used:

  configure \
      --prefix=/usr \
      --sysconfdir=/etc \
      --localstatedir=/var \
      --libexecdir=/usr/lib/qemu \
      --extra-ldflags="$LDFLAGS" \
      --smbd=/usr/bin/smbd \
      --enable-modules \
      --enable-sdl \
      --disable-werror \
      --enable-slirp=system \
      --enable-xfsctl \
      --audio-drv-list="pa alsa sdl"
      
  Error log attached. Here is the beginning:

  /usr/bin/ld: /usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../lib/Scrt1.o: in function `_start':
  (.text+0x24): undefined reference to `main'
  /usr/bin/ld: libblock-curl.a(block_curl.c.o): in function `curl_block_init':

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Re: [Bug 1896096] Re: Git version: Build process is broken in block_curl.c.o

[Paolo Bonzini]

Il dom 20 set 2020, 00:40 Toolybird <1896096@bugs.launchpad.net> ha
scritto:

> Looking deeper into this... I believe there are indeed qemu bugs here.
>

You're right.

$ cat test
#! /bin/sh
echo before
env | grep LDFLAGS
LDFLAGS="-pie $LDFLAGS"
echo after
env | grep LDFLAGS

$ ./test
before
after

$ LDFLAGS='-Wl,--as-needed' ./test before
LDFLAGS=-Wl,--as-needed
after
LDFLAGS=-pie -Wl,--as-needed

Because changes to environment variables propagate without having to export
them again.

So we need to unset CFLAGS and LDFLAGS in the configure script.

Paolo

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Title:
  Git version: Build process is broken in block_curl.c.o

Status in QEMU:
  Invalid

Bug description:
  Gcc version: 10.2.0
  Glusterfs: 8.1
  Libguestfs: 1.42

  Configure options used:

  configure \
      --prefix=/usr \
      --sysconfdir=/etc \
      --localstatedir=/var \
      --libexecdir=/usr/lib/qemu \
      --extra-ldflags="$LDFLAGS" \
      --smbd=/usr/bin/smbd \
      --enable-modules \
      --enable-sdl \
      --disable-werror \
      --enable-slirp=system \
      --enable-xfsctl \
      --audio-drv-list="pa alsa sdl"
      
  Error log attached. Here is the beginning:

  /usr/bin/ld: /usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../lib/Scrt1.o: in function `_start':
  (.text+0x24): undefined reference to `main'
  /usr/bin/ld: libblock-curl.a(block_curl.c.o): in function `curl_block_init':

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[Bug 1896096] Re: Git version: Build process is broken in block_curl.c.o

[Toolybird]

> So we need to unset CFLAGS and LDFLAGS in the configure script.

Yes, but is this what you really want? It seems to go against standard
practice. The usual expectation is even documented in Meson docs:

https://mesonbuild.com/howtox.html#set-extra-compiler-and-linker-flags-
from-the-outside-when-eg-building-distro-packages

Yes, qemu is a complex beast and I understand why you want full control
over the build. But it certainly will make life harder for downstream
distros/users who like to build pkgs with their own preferred options.

BTW, --extra-ldflags="my additional linker option" seems to work.
But --extra-cflags="my additional compiler switch" seems to also add it to the link line which seems a bit odd?

>From configure script:

--extra-cflags=*) QEMU_CFLAGS="$QEMU_CFLAGS $optarg"
                  QEMU_LDFLAGS="$QEMU_LDFLAGS $optarg"

The whole conversion to Meson is clearly a massive effort and deserves
big praise :) But as a clueless end user, I wonder why you didn't just
bite the bullet and go full Meson (à la Libvirt) and get rid of the
configure script completely?

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Title:
  Git version: Build process is broken in block_curl.c.o

Status in QEMU:
  Invalid

Bug description:
  Gcc version: 10.2.0
  Glusterfs: 8.1
  Libguestfs: 1.42

  Configure options used:

  configure \
      --prefix=/usr \
      --sysconfdir=/etc \
      --localstatedir=/var \
      --libexecdir=/usr/lib/qemu \
      --extra-ldflags="$LDFLAGS" \
      --smbd=/usr/bin/smbd \
      --enable-modules \
      --enable-sdl \
      --disable-werror \
      --enable-slirp=system \
      --enable-xfsctl \
      --audio-drv-list="pa alsa sdl"
      
  Error log attached. Here is the beginning:

  /usr/bin/ld: /usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../lib/Scrt1.o: in function `_start':
  (.text+0x24): undefined reference to `main'
  /usr/bin/ld: libblock-curl.a(block_curl.c.o): in function `curl_block_init':

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[Bug 1896096] Re: Git version: Build process is broken in block_curl.c.o

[Paolo Bonzini]

> But --extra-cflags="my additional compiler switch" seems to
> also add it to the link line which seems a bit odd?

That's due to LTO.  IIRC autotools do the same (after all
the linking step is a "cc" invocation), but I may be wrong.

> I wonder why you didn't just bite the bullet and go full Meson
> (à la Libvirt) and get rid of the configure script completely?

Because that would have been 8000 more lines to convert and
more bugs that would not have been caught before the merge.
The problem with having custom Makefiles is that some rebases
were horrible.  When going from 4.2 to 5.1, there were a couple
merge commits that took me one day each!  In addition, compared
to Libvirt adding new source files seemed much more common in QEMU.

Basically the conversion was merged in the "worst possible
state that can already be considered an improvement", in order
to focus on fixing bugs and progressing in the conversion,
rather than on rebases.  I must admit it was a bit worse than
expected, but as long as maintainers have not been blocked in
their work it's still more or less going according to plan.

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Title:
  Git version: Build process is broken in block_curl.c.o

Status in QEMU:
  Invalid

Bug description:
  Gcc version: 10.2.0
  Glusterfs: 8.1
  Libguestfs: 1.42

  Configure options used:

  configure \
      --prefix=/usr \
      --sysconfdir=/etc \
      --localstatedir=/var \
      --libexecdir=/usr/lib/qemu \
      --extra-ldflags="$LDFLAGS" \
      --smbd=/usr/bin/smbd \
      --enable-modules \
      --enable-sdl \
      --disable-werror \
      --enable-slirp=system \
      --enable-xfsctl \
      --audio-drv-list="pa alsa sdl"
      
  Error log attached. Here is the beginning:

  /usr/bin/ld: /usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../lib/Scrt1.o: in function `_start':
  (.text+0x24): undefined reference to `main'
  /usr/bin/ld: libblock-curl.a(block_curl.c.o): in function `curl_block_init':

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[Bug 1896096] Re: Git version: Build process is broken in block_curl.c.o

[Paolo Bonzini]

Posted "[PATCH 0/4] configure: bugfixes and cleanups for CFLAGS".

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Title:
  Git version: Build process is broken in block_curl.c.o

Status in QEMU:
  Invalid

Bug description:
  Gcc version: 10.2.0
  Glusterfs: 8.1
  Libguestfs: 1.42

  Configure options used:

  configure \
      --prefix=/usr \
      --sysconfdir=/etc \
      --localstatedir=/var \
      --libexecdir=/usr/lib/qemu \
      --extra-ldflags="$LDFLAGS" \
      --smbd=/usr/bin/smbd \
      --enable-modules \
      --enable-sdl \
      --disable-werror \
      --enable-slirp=system \
      --enable-xfsctl \
      --audio-drv-list="pa alsa sdl"
      
  Error log attached. Here is the beginning:

  /usr/bin/ld: /usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../lib/Scrt1.o: in function `_start':
  (.text+0x24): undefined reference to `main'
  /usr/bin/ld: libblock-curl.a(block_curl.c.o): in function `curl_block_init':

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[Bug 1896096] Re: Git version: Build process is broken in block_curl.c.o

[Toolybird]

> Posted "[PATCH 0/4] configure: bugfixes and cleanups for CFLAGS".

(sorry for delay)

Thanks for the patches. They seem to fix the Arch case i.e. build
succeeds without hacks and FLAGS in the build env are being respected.

However, I tested the "unset FLAGS" case and patch 4/4 seems to cause a
weird failure I don't understand:

../qemu/meson.build:1:0: ERROR: Unable to determine dynamic linker

A full log can be found at /build/qemu-git/src/build-full/meson-logs
/meson-log.txt

ERROR: meson setup failed

There is nothing in meson-log to indicate the failure reason. Any ideas?

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Title:
  Git version: Build process is broken in block_curl.c.o

Status in QEMU:
  Invalid

Bug description:
  Gcc version: 10.2.0
  Glusterfs: 8.1
  Libguestfs: 1.42

  Configure options used:

  configure \
      --prefix=/usr \
      --sysconfdir=/etc \
      --localstatedir=/var \
      --libexecdir=/usr/lib/qemu \
      --extra-ldflags="$LDFLAGS" \
      --smbd=/usr/bin/smbd \
      --enable-modules \
      --enable-sdl \
      --disable-werror \
      --enable-slirp=system \
      --enable-xfsctl \
      --audio-drv-list="pa alsa sdl"
      
  Error log attached. Here is the beginning:

  /usr/bin/ld: /usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../lib/Scrt1.o: in function `_start':
  (.text+0x24): undefined reference to `main'
  /usr/bin/ld: libblock-curl.a(block_curl.c.o): in function `curl_block_init':

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[Bug 1896096] Re: Git version: Build process is broken in block_curl.c.o

[Toolybird]

** Attachment added: "meson-log.txt"
   https://bugs.launchpad.net/qemu/+bug/1896096/+attachment/5413347/+files/meson-log.txt

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Title:
  Git version: Build process is broken in block_curl.c.o

Status in QEMU:
  Invalid

Bug description:
  Gcc version: 10.2.0
  Glusterfs: 8.1
  Libguestfs: 1.42

  Configure options used:

  configure \
      --prefix=/usr \
      --sysconfdir=/etc \
      --localstatedir=/var \
      --libexecdir=/usr/lib/qemu \
      --extra-ldflags="$LDFLAGS" \
      --smbd=/usr/bin/smbd \
      --enable-modules \
      --enable-sdl \
      --disable-werror \
      --enable-slirp=system \
      --enable-xfsctl \
      --audio-drv-list="pa alsa sdl"
      
  Error log attached. Here is the beginning:

  /usr/bin/ld: /usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../lib/Scrt1.o: in function `_start':
  (.text+0x24): undefined reference to `main'
  /usr/bin/ld: libblock-curl.a(block_curl.c.o): in function `curl_block_init':

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Re: [Bug 1896096] Re: Git version: Build process is broken in block_curl.c.o

[Paolo Bonzini]

Yes that's a silly mistake that invokes the linker with a dummy empty
argument. I'll fix it and repost, thanks for testing on Arch!

Paolo

Il mar 22 set 2020, 23:41 Toolybird <1896096@bugs.launchpad.net> ha
scritto:

> ** Attachment added: "meson-log.txt"
>
> https://bugs.launchpad.net/qemu/+bug/1896096/+attachment/5413347/+files/meson-log.txt
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1896096
>
> Title:
>   Git version: Build process is broken in block_curl.c.o
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/qemu/+bug/1896096/+subscriptions
>
>

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Title:
  Git version: Build process is broken in block_curl.c.o

Status in QEMU:
  Invalid

Bug description:
  Gcc version: 10.2.0
  Glusterfs: 8.1
  Libguestfs: 1.42

  Configure options used:

  configure \
      --prefix=/usr \
      --sysconfdir=/etc \
      --localstatedir=/var \
      --libexecdir=/usr/lib/qemu \
      --extra-ldflags="$LDFLAGS" \
      --smbd=/usr/bin/smbd \
      --enable-modules \
      --enable-sdl \
      --disable-werror \
      --enable-slirp=system \
      --enable-xfsctl \
      --audio-drv-list="pa alsa sdl"
      
  Error log attached. Here is the beginning:

  /usr/bin/ld: /usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../lib/Scrt1.o: in function `_start':
  (.text+0x24): undefined reference to `main'
  /usr/bin/ld: libblock-curl.a(block_curl.c.o): in function `curl_block_init':

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[Bug 1896096] Re: Git version: Build process is broken in block_curl.c.o

[Toolybird]

v2 patches appear to work fine in both test scenarios. Thanks again.

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Title:
  Git version: Build process is broken in block_curl.c.o

Status in QEMU:
  Invalid

Bug description:
  Gcc version: 10.2.0
  Glusterfs: 8.1
  Libguestfs: 1.42

  Configure options used:

  configure \
      --prefix=/usr \
      --sysconfdir=/etc \
      --localstatedir=/var \
      --libexecdir=/usr/lib/qemu \
      --extra-ldflags="$LDFLAGS" \
      --smbd=/usr/bin/smbd \
      --enable-modules \
      --enable-sdl \
      --disable-werror \
      --enable-slirp=system \
      --enable-xfsctl \
      --audio-drv-list="pa alsa sdl"
      
  Error log attached. Here is the beginning:

  /usr/bin/ld: /usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../lib/Scrt1.o: in function `_start':
  (.text+0x24): undefined reference to `main'
  /usr/bin/ld: libblock-curl.a(block_curl.c.o): in function `curl_block_init':

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[Bug 1896096] Re: Git version: Build process is broken in block_curl.c.o

[Frederic Bezies]

Just asking: any hope to see this patch added to qemu git source code?

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Title:
  Git version: Build process is broken in block_curl.c.o

Status in QEMU:
  Invalid

Bug description:
  Gcc version: 10.2.0
  Glusterfs: 8.1
  Libguestfs: 1.42

  Configure options used:

  configure \
      --prefix=/usr \
      --sysconfdir=/etc \
      --localstatedir=/var \
      --libexecdir=/usr/lib/qemu \
      --extra-ldflags="$LDFLAGS" \
      --smbd=/usr/bin/smbd \
      --enable-modules \
      --enable-sdl \
      --disable-werror \
      --enable-slirp=system \
      --enable-xfsctl \
      --audio-drv-list="pa alsa sdl"
      
  Error log attached. Here is the beginning:

  /usr/bin/ld: /usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../lib/Scrt1.o: in function `_start':
  (.text+0x24): undefined reference to `main'
  /usr/bin/ld: libblock-curl.a(block_curl.c.o): in function `curl_block_init':

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Re: [Bug 1896096] Re: Git version: Build process is broken in block_curl.c.o

[Paolo Bonzini]

Yes, of course.

Il mer 30 set 2020, 21:25 Frederic Bezies <1896096@bugs.launchpad.net> ha
scritto:

> Just asking: any hope to see this patch added to qemu git source code?
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1896096
>
> Title:
>   Git version: Build process is broken in block_curl.c.o
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/qemu/+bug/1896096/+subscriptions
>
>

-- 
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/1896096

Title:
  Git version: Build process is broken in block_curl.c.o

Status in QEMU:
  Invalid

Bug description:
  Gcc version: 10.2.0
  Glusterfs: 8.1
  Libguestfs: 1.42

  Configure options used:

  configure \
      --prefix=/usr \
      --sysconfdir=/etc \
      --localstatedir=/var \
      --libexecdir=/usr/lib/qemu \
      --extra-ldflags="$LDFLAGS" \
      --smbd=/usr/bin/smbd \
      --enable-modules \
      --enable-sdl \
      --disable-werror \
      --enable-slirp=system \
      --enable-xfsctl \
      --audio-drv-list="pa alsa sdl"
      
  Error log attached. Here is the beginning:

  /usr/bin/ld: /usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../lib/Scrt1.o: in function `_start':
  (.text+0x24): undefined reference to `main'
  /usr/bin/ld: libblock-curl.a(block_curl.c.o): in function `curl_block_init':

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[Bug 1896096] Re: Git version: Build process is broken in block_curl.c.o

[Toolybird]

Hi Paolo,

The CFLAGS patches seem to have missed your last big pull req:

[PULL v8 00/86] Misc QEMU patches for 2020-09-24

Apparently disappeared between v3 and v4. Oversight or intentional?
Thanks.

-- 
You received this bug notification because you are a member of qemu-
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https://bugs.launchpad.net/bugs/1896096

Title:
  Git version: Build process is broken in block_curl.c.o

Status in QEMU:
  Invalid

Bug description:
  Gcc version: 10.2.0
  Glusterfs: 8.1
  Libguestfs: 1.42

  Configure options used:

  configure \
      --prefix=/usr \
      --sysconfdir=/etc \
      --localstatedir=/var \
      --libexecdir=/usr/lib/qemu \
      --extra-ldflags="$LDFLAGS" \
      --smbd=/usr/bin/smbd \
      --enable-modules \
      --enable-sdl \
      --disable-werror \
      --enable-slirp=system \
      --enable-xfsctl \
      --audio-drv-list="pa alsa sdl"
      
  Error log attached. Here is the beginning:

  /usr/bin/ld: /usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../lib/Scrt1.o: in function `_start':
  (.text+0x24): undefined reference to `main'
  /usr/bin/ld: libblock-curl.a(block_curl.c.o): in function `curl_block_init':

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[Bug 1896096] Re: Git version: Build process is broken in block_curl.c.o

[Paolo Bonzini]

Intentional because they possibly broke one of the build scenarios that
are tested pre-pull (even though the GitLab CI was fine, it does not yet
cover everything).

The plan is to flush my queue until there's only the current 5 pending
meson patches, and then submit those in isolation.

-- 
You received this bug notification because you are a member of qemu-
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https://bugs.launchpad.net/bugs/1896096

Title:
  Git version: Build process is broken in block_curl.c.o

Status in QEMU:
  Invalid

Bug description:
  Gcc version: 10.2.0
  Glusterfs: 8.1
  Libguestfs: 1.42

  Configure options used:

  configure \
      --prefix=/usr \
      --sysconfdir=/etc \
      --localstatedir=/var \
      --libexecdir=/usr/lib/qemu \
      --extra-ldflags="$LDFLAGS" \
      --smbd=/usr/bin/smbd \
      --enable-modules \
      --enable-sdl \
      --disable-werror \
      --enable-slirp=system \
      --enable-xfsctl \
      --audio-drv-list="pa alsa sdl"
      
  Error log attached. Here is the beginning:

  /usr/bin/ld: /usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../lib/Scrt1.o: in function `_start':
  (.text+0x24): undefined reference to `main'
  /usr/bin/ld: libblock-curl.a(block_curl.c.o): in function `curl_block_init':

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[Bug 1896096] Re: Git version: Build process is broken in block_curl.c.o

[Paolo Bonzini]

New version of the patches posted:

[PATCH 0/4] Convert remaining submodules to meson, cleanup env var
handling

This will sidestep the issue that broke in the Sep 24 pull request.

-- 
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https://bugs.launchpad.net/bugs/1896096

Title:
  Git version: Build process is broken in block_curl.c.o

Status in QEMU:
  Invalid

Bug description:
  Gcc version: 10.2.0
  Glusterfs: 8.1
  Libguestfs: 1.42

  Configure options used:

  configure \
      --prefix=/usr \
      --sysconfdir=/etc \
      --localstatedir=/var \
      --libexecdir=/usr/lib/qemu \
      --extra-ldflags="$LDFLAGS" \
      --smbd=/usr/bin/smbd \
      --enable-modules \
      --enable-sdl \
      --disable-werror \
      --enable-slirp=system \
      --enable-xfsctl \
      --audio-drv-list="pa alsa sdl"
      
  Error log attached. Here is the beginning:

  /usr/bin/ld: /usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../lib/Scrt1.o: in function `_start':
  (.text+0x24): undefined reference to `main'
  /usr/bin/ld: libblock-curl.a(block_curl.c.o): in function `curl_block_init':

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