[Bug libc/29621] librtld.os: in function `__register_frame': libgcc/unwind-dw2-fde.c:136: undefined reference to `malloc'

["arnout at mind dot be" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=29621

Arnout Vandecappelle <arnout at mind dot be> changed:

           What    |Removed                     |Added
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                 CC|                            |arnout at mind dot be

--- Comment #17 from Arnout Vandecappelle <arnout at mind dot be> ---
I can reproduce the issue with:

CFLAGS_FOR_TARGET='-O0' scripts/build-many-glibcs.py /var/tmp/glibc-tests
compilers nios2-linux-gnu

It fails at compilers-nios2-linux-gnu glibc nios2-linux-gnu build with

/.../nios2-glibc-linux-gnu/bin/ld:
/.../nios2-linux-gnu/glibc/nios2-linux-gnu/elf/librtld.os: in function
`__register_frame':
/.../libgcc/unwind-dw2-fde.c:136: undefined reference to `malloc'


I don't know if we can conclude if the problem is in GCC or in glibc. There is
a GCC bug as well: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107728 but they
answer with:

> This is not a GCC issue as __register_frame_table is declared as extern.
> This is almost definitely a glibc issue really.
> But I doubt glibc can be compiled at -O0 because of these issues.
> [Moreover], the functions are not optimized out at -O2 but rather they
> don't get pulled in glibc building because another function is referenced.
> 
> Either libgcc should be built with -fdata-sections -ffunction-sections or 
> glibc builds needs to be fixed such that it does not reference the function
> in the unwinder at -O0.  You need to look at the linker map to figure why
> the object file is being pulled into glibc at -O0 and not at -O2.
> But it is still a bug in glibc's ld.so really.

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