[Buildroot] [Bug 13661] New: host-python2 build fails on aarch64

[Buildroot] [Bug 13661] New: host-python2 build fails on aarch64

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=13661

            Bug ID: 13661
           Summary: host-python2 build fails on aarch64
           Product: buildroot
           Version: unspecified
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P5
         Component: Other
          Assignee: unassigned at buildroot.uclibc.org
          Reporter: christian at paral.in
                CC: buildroot at uclibc.org
  Target Milestone: ---

I'm seeing the following build error on armv8 (aarch64):

/build/host-python-2.7.18/Modules/_ctypes/libffi/src/closures.c:472:7: warning:
ignoring return value of 'ftruncate' declared with attribute
'warn_unused_result' [-Wunused-result]
2021-03-23T08:50:16.2844591Z   472 |       ftruncate (execfd, offset);
2021-03-23T08:50:16.2845961Z       |       ^~~~~~~~~~~~~~~~~~~~~~~~~~
2021-03-23T08:50:16.3656935Z
/build/host-python-2.7.18/Modules/_ctypes/libffi/src/aarch64/sysv.S: Assembler
messages:
2021-03-23T08:50:16.3669765Z
/build/host-python-2.7.18/Modules/_ctypes/libffi/src/aarch64/sysv.S:145: Error:
constant expression required at operand 2 -- `tbz
x23,#AARCH64_FFI_WITH_V_BIT,1f'
2021-03-23T08:50:16.3679469Z
/build/host-python-2.7.18/Modules/_ctypes/libffi/src/aarch64/sysv.S:174: Error:
constant expression required at operand 2 -- `tbz
x23,#AARCH64_FFI_WITH_V_BIT,1f'
2021-03-23T08:50:16.3688258Z
/build/host-python-2.7.18/Modules/_ctypes/libffi/src/aarch64/sysv.S:282: Error:
constant expression required at operand 2 -- `tbz
x0,#AARCH64_FFI_WITH_V_BIT,1f'
2021-03-23T08:50:16.3692215Z building dbm using gdbm
2021-03-23T08:50:16.3693379Z 
2021-03-23T08:50:16.3695198Z Python build finished, but the necessary bits to
build these modules were not found:
2021-03-23T08:50:16.3697325Z _tkinter           bsddb185           dl           
2021-03-23T08:50:16.3698676Z imageop            sunaudiodev                     
2021-03-23T08:50:16.3702910Z To find the necessary bits, look in setup.py in
detect_modules() for the module's name.
2021-03-23T08:50:16.3704463Z 
2021-03-23T08:50:16.3705077Z 
2021-03-23T08:50:16.3706170Z Failed to build these modules:
2021-03-23T08:50:16.3707366Z _ctypes                    

This is building on Gentoo arm64 on a Jetson tx2:

gcc --version
gcc (Gentoo 10.2.0-r5 p6) 10.2.0

Is the compiler generating invalid asm? How to fix this, so that host-python
works on arm64?

The full build output is here (& attached to bug):

https://github.com/skiffos/SkiffOS/runs/2172698881

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[Buildroot] [Bug 13661] host-python2 build fails on aarch64

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=13661

Christian Stewart <christian@paral.in> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Version|unspecified                 |2020.11.3
                 CC|                            |christian at paral.in
               Host|                            |jetson tx2 (arm64)
              Build|                            |ccf38c04f05819594b034b5def8
                   |                            |4e18e4699cffd
             Target|                            |odroid c4 (arm64)

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[Buildroot] [Bug 13661] host-python2 build fails on aarch64

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=13661

Christian Stewart <christian@paral.in> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |WORKSFORME

--- Comment #1 from Christian Stewart <christian@paral.in> ---
Not seeing this anymore, not sure why.

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[Buildroot] [Bug 13661] host-python2 build fails on aarch64

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=13661

Christian Stewart <christian@paral.in> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
         Resolution|WORKSFORME                  |---

--- Comment #2 from Christian Stewart <christian@paral.in> ---
https://github.com/skiffos/SkiffOS/issues/142

According to some users attempting to build with Arm64 machines using Ubuntu as
the host (for Buildroot) against latest 2021.02.3,

This issue is still present - host-python fails to build.

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[Buildroot] [Bug 13661] host-python2 build fails on aarch64

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=13661

--- Comment #3 from Torsten Hahn <torstenhahn@fastmail.fm> ---
I experiencing the same issue here:

Host System: docker container running at an Apple M1 machine, git checkout of
recent stable buildroot

(created via docker buildx build --platform linux/arm64 -t br_db/arm64) running
a recent ubuntu image as triggers the described error as soon as host-python2
is built.

Would be very nice to have a workaround / fix for this because we have several
build machines with aarch64 architecture.

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[Buildroot] [Bug 13661] host-python2 build fails on aarch64

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=13661

Torsten Hahn <torstenhahn@fastmail.fm> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|normal                      |major
                 CC|                            |torstenhahn at fastmail.fm

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[Buildroot] [Bug 13661] host-python2 build fails on aarch64

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=13661

--- Comment #4 from Erico Nunes <nunes.erico@gmail.com> ---
Created attachment 9006
  --> https://bugs.busybox.net/attachment.cgi?id=9006&action=edit
0001-python-use-system-libffi-for-host-python.patch

I remember seeing this a while back. I looked a bit into the problem back then
and solved it with the attached patch.
I never went around to fully testing it and submitting it to the list.
If it solves the problem for you, feel free to take it and submit it to the
list.

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[Buildroot] [Bug 13661] host-python2 build fails on aarch64

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=13661

--- Comment #5 from Christian Stewart <christian@paral.in> ---
Erico, thanks, your patch works great.

I will submit to the list.

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[Buildroot] [Bug 13661] host-python2 build fails on aarch64

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=13661

Yann E. MORIN <yann.morin.1998@free.fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|REOPENED                    |RESOLVED
         Resolution|---                         |FIXED
                 CC|                            |yann.morin.1998 at free.fr

--- Comment #6 from Yann E. MORIN <yann.morin.1998@free.fr> ---
Christian, All,

Thanks for the report.

We believe this is now fixed with the patch you submitted, and which was just
appiled as of commit b31f7bc958.

Thank you!

Regards,
Yann E. MORIN.

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