[Buildroot] [Bug 14581] qemu-system-ppc -M mac99 does not boot for glibc system

[bugzilla@busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=14581

--- Comment #1 from romain.naour@gmail.com ---
Hi Waldemar,

Thanks for the report!

I can reproduce it easily with gcc-10 and gcc-11 but not with gcc-9.

The powerpc 7400 support has been broken since the beginning of gcc-10
development.
After the commit [1] removing -many from the options passed by default to the
assembler, the build of this defconfig fail with assembler errors:

arch/powerpc/perf/bhrb.S: Assembler messages:
arch/powerpc/perf/bhrb.S:22: Error: unrecognized opcode: `cmpldi'
arch/powerpc/perf/bhrb.S:24: Error: unrecognized opcode: `ld'
arch/powerpc/perf/bhrb.S:25: Error: unrecognized opcode: `sldi'

It was fixed later by the commit [2] before the gcc-10 release but glibc
segfault at runtime since then.

The Buildroot gitlab-ci testing only test with uClibc-ng libc but I try
sometime with Glibc... but I missed this issue.

This issue should be reported to gcc.

[1]
https://gcc.gnu.org/git/?p=gcc.git;a=commitdiff;h=e154242724b084380e3221df7c08fcdbd8460674
[2]
https://gcc.gnu.org/git/?p=gcc.git;a=commitdiff;h=66711279083121b07d909ac0fc2f3a744ac7c937

Best regards,
Romain

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