[Bug other/96217] undefined reference to `_Unwind_Resume'

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96217

--- Comment #5 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to LE GARREC Vincent from comment #0)
> Created attachment 48880 [details]
> glibc-build.zip
> 
> I work on Gentoo. I compiled gcc with -O0 and I was able to complete the
> build (I didn't executed tests).
> 
> But I try to compile glibc with gcc built with -O0. The log says :
> 
> /usr/lib/gcc/x86_64-pc-linux-gnu/10.1.0/../../../../x86_64-pc-linux-gnu/bin/
> ld.bfd: /usr/lib/gcc/x86_64-pc-linux-gnu/10.1.0/32/libgcc.a(_divdi3.o): in
> function `__divdi3':
> /var/tmp/portage/sys-devel/gcc-10.1.0-r2/work/gcc-10.1.0/libgcc/libgcc2.c:
> 1246: undefined reference to `_Unwind_Resume'
> /usr/lib/gcc/x86_64-pc-linux-gnu/10.1.0/../../../../x86_64-pc-linux-gnu/bin/
> ld.bfd:
> /usr/lib/gcc/x86_64-pc-linux-gnu/10.1.0/32/libgcc.a(_divdi3.o):(.data.rel.
> local.DW.ref.__gcc_personality_v0[DW.ref.__gcc_personality_v0]+0x0):
> undefined reference to `__gcc_personality_v0'
> /usr/lib/gcc/x86_64-pc-linux-gnu/10.1.0/../../../../x86_64-pc-linux-gnu/bin/
> ld.bfd: /usr/lib/gcc/x86_64-pc-linux-gnu/10.1.0/32/libgcc.a(_moddi3.o): in
> function `__moddi3':
> /var/tmp/portage/sys-devel/gcc-10.1.0-r2/work/gcc-10.1.0/libgcc/libgcc2.c:
> 1269: undefined reference to `_Unwind_Resume'
> 
> A simple test case is really hard because gcc successfully built small other
> packages and I have no idea why I have this "undefined reference".
> 
> I was able to compiling gcc with -O2 (with gcc built with -O0) then to build
> glibc successfully.
> 
> Please find enclosed the build.log of glibc.

How did you build GCC with -O0?  I never have any problems glibc build
using GCC built with -O0.  I configure GCC -O0 build with

CC="gcc" CXX="g++" BOOT_CFLAGS="-O0 -g" CFLAGS="-O0 -g" BOOT_CXXFLAGS="-g"
CXXFLAGS="-g" CFLAGS_FOR_TARGET="-O2 -g" CXXFLAGS_FOR_TARGET="-O2 -g"
/export/gnu/import/git/sources/gcc/configure --disable-bootstrap