Re: Build problems with xen 4.7

From: M A Young <m.a.young@durham.ac.uk>
To: Peng Fan <van.freenix@gmail.com>
Cc: julien.grall@arm.com, xen-devel@lists.xen.org,
	Marcos Matsunaga <marcos.matsunaga@oracle.com>,
	Jan Beulich <JBeulich@suse.com>
Subject: Re: Build problems with xen 4.7
Date: Mon, 8 Aug 2016 20:22:57 +0100 (BST)	[thread overview]
Message-ID: <alpine.LFD.2.20.1608082003250.3659@austen3.home> (raw)
In-Reply-To: <20160808143732.GA6990@linux-7smt.suse>

On Mon, 8 Aug 2016, Peng Fan wrote:

> ...
> <command-line>:0:0: error: "__OBJECT_FILE__" redefined [-Werror]
> <command-line>:0:0: note: this is the location of the previous definition
> cc1: all warnings being treated as errors
>
> ...
>
> Does this patch work when cross compile for ARM64?

I dropped that patch following suggestions on this thread, and just did it 
in the spec file, where the relevant bit is

export EXTRA_CFLAGS_XEN_TOOLS="$RPM_OPT_FLAGS"
export EXTRA_CFLAGS_QEMU_TRADITIONAL="$RPM_OPT_FLAGS"
export EXTRA_CFLAGS_QEMU_XEN="$RPM_OPT_FLAGS"
%if %build_crosshyp
XEN_TARGET_ARCH=x86_64 make %{?_smp_mflags} %{?efi_flags} prefix=/usr xen CC="/usr/bin/x86_64-linux-gnu-gcc `echo $RPM_OPT_FLAGS | sed -e 's/-m32//g' -e 's/-march=i686//g' -e 's/-mtune=atom//g'`"
%else
make %{?_smp_mflags} %{?efi_flags} prefix=/usr xen CC="gcc $RPM_OPT_FLAGS"
%endif
./configure --prefix=%{_prefix} --libdir=%{_libdir} --with-system-seabios=%{seabiosloc} --with-system-qemu=/usr/bin/qemu-system-i386 --with-linux-backend-modules="xen-evtchn xen-gntdev xen-gntalloc xen-blkback xen-netback xen-pciback xen-scsiback xen-acpi-processor"
make %{?_smp_mflags} %{?ocaml_flags} prefix=/usr tools
make                 prefix=/usr docs
export RPM_OPT_FLAGS_RED=`echo $RPM_OPT_FLAGS | sed -e 's/-m64//g' -e 's/--param=ssp-buffer-size=4//g' -e's/-fstack-protector-strong//'`
%ifarch %{ix86}
export EXTRA_CFLAGS_XEN_TOOLS="$RPM_OPT_FLAGS_RED"
%endif
make mini-os-dir
make -C stubdom build
%ifarch x86_64
export EXTRA_CFLAGS_XEN_TOOLS="$RPM_OPT_FLAGS_RED"
XEN_TARGET_ARCH=x86_32 make -C stubdom pv-grub
%endif

which is a bit messy but seems to work. In summary you need not to set 
CFLAGS or unset it, and can instead pass extra compile options using
EXTRA_CFLAGS_XEN_TOOLS, EXTRA_CFLAGS_QEMU_TRADITIONAL and 
EXTRA_CFLAGS_QEMU_XEN and with CC="gcc compile_options" added to the make 
command for the hypervisor.

	Michael Young

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