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Subject: Re: _Unwind_Backtrace crashes
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* Alexander Monakov <amonakov@ispras.ru> [2015-08-28 16:21:08 +0300]:
> I was able to reproduce this using the musl-gcc wrapper on a glibc-based
> system.  I tracked it down to dl_iterate_phdr callback in libgcc failing to
> find PT_GNU_EH_FRAME header in this loop:
> 
> https://gcc.gnu.org/git/?p=gcc.git;a=blob;f=libgcc/unwind-dw2-fde-dip.c;h=137dced8d558b9f786d935c8e4ab73200fb6409d;hb=HEAD#l267
> 
> And indeed adding -Wl,--eh-frame-hdr to the musl-gcc command line fixes it.
> 

here the test works even without .eh_frame_hdr with gcc-5.1 (alpine, musl based toolchain).

but i see the same failure with gcc-4.9.2 (debian, glibc based) and then --eh-frame-hdr fixes it.

> Normally this ld option is present in built-in specs, but musl-gcc's specs
> don't set it.
> 
> Alexander