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

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

[legarrec.vincent at gmail dot com]

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

            Bug ID: 96217
           Summary: undefined reference to `_Unwind_Resume'
           Product: gcc
           Version: 10.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: other
          Assignee: unassigned at gcc dot gnu.org
          Reporter: legarrec.vincent at gmail dot com
  Target Milestone: ---

Created attachment 48880
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=48880&action=edit
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.

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

[rguenth at gcc dot gnu.org]

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

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
I think you should report this to glibc, not GCC.

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

[legarrec.vincent at gmail dot com]

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

--- Comment #2 from LE GARREC Vincent <legarrec.vincent at gmail dot com> ---
Are you sure ?

I thought it the fault of GCC because :
  - glibc can be build if gcc was built with -O2
  - glibc can't be build if gcc was built with -O0

I think the build of glibc should not depend on the CFLAGS of GCC.

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

[jakub at gcc dot gnu.org]

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

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jakub at gcc dot gnu.org

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
The division and modulo functions in glibc are built with -fexceptions (since
r190483 it seems), so I guess you don't really want to build them with -O0,
because in that case you might end up with some _Unwind_Resume,
__gcc_personality_v0 etc. not optimized away like it happened to you.
You'd need to link with -lgcc_eh to get those, as it is not in -lgcc
(intentionally) or -shared-libgcc.

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

[legarrec.vincent at gmail dot com]

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

--- Comment #4 from LE GARREC Vincent <legarrec.vincent at gmail dot com> ---
I know that building the world with -O0 can be strange but it really helps me
when a software crashes.
Thanks, -lgcc_eh solves the problem. I will create a bugreport to glibc and
hope they will fix it.
Maybe you can change the status to Invalid ? I can only use RESOLVED.

[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

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

[legarrec.vincent at gmail dot com]

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

--- Comment #6 from LE GARREC Vincent <legarrec.vincent at gmail dot com> ---
My log says :

>>> Configuring source in /var/tmp/portage/sys-devel/gcc-10.1.0-r2/work/gcc-10.1.0 ...
 * CFLAGS="-march=native -O0 -ggdb2 -g2 -pipe -fno-omit-frame-pointer"
 * CXXFLAGS="-march=native -O0 -ggdb2 -g2 -pipe -fno-omit-frame-pointer"
 * LDFLAGS="-Wl,-O0 -Wl,--as-needed"

 * PREFIX:          /usr
 * BINPATH:         /usr/x86_64-pc-linux-gnu/gcc-bin/10.1.0
 * LIBPATH:         /usr/lib/gcc/x86_64-pc-linux-gnu/10.1.0
 * DATAPATH:        /usr/share/gcc-data/x86_64-pc-linux-gnu/10.1.0
 * STDCXX_INCDIR:   /usr/lib/gcc/x86_64-pc-linux-gnu/10.1.0/include/g++-v10

 * Languages:       c,c++,fortran

 * Configuring GCC with:
 *      --host=x86_64-pc-linux-gnu
 *      --build=x86_64-pc-linux-gnu
 *      --prefix=/usr
 *      --bindir=/usr/x86_64-pc-linux-gnu/gcc-bin/10.1.0
 *      --includedir=/usr/lib/gcc/x86_64-pc-linux-gnu/10.1.0/include
 *      --datadir=/usr/share/gcc-data/x86_64-pc-linux-gnu/10.1.0
 *      --mandir=/usr/share/gcc-data/x86_64-pc-linux-gnu/10.1.0/man
 *      --infodir=/usr/share/gcc-data/x86_64-pc-linux-gnu/10.1.0/info
 *     
--with-gxx-include-dir=/usr/lib/gcc/x86_64-pc-linux-gnu/10.1.0/include/g++-v10
 *      --with-python-dir=/share/gcc-data/x86_64-pc-linux-gnu/10.1.0/python
 *      --enable-languages=c,c++,fortran
 *      --enable-obsolete
 *      --enable-secureplt
 *      --disable-werror
 *      --with-system-zlib
 *      --disable-nls
 *      --enable-checking=release
 *      --with-bugurl=https://bugs.gentoo.org/
 *      --with-pkgversion=Gentoo 10.1.0-r2 p3
 *      --disable-esp
 *      --enable-libstdcxx-time
 *      --enable-shared
 *      --enable-threads=posix
 *      --enable-__cxa_atexit
 *      --enable-clocale=gnu
 *      --enable-multilib
 *      --with-multilib-list=m32,m64
 *      --disable-fixed-point
 *      --enable-targets=all
 *      --enable-libgomp
 *      --disable-libmudflap
 *      --disable-libssp
 *      --disable-libada
 *      --disable-systemtap
 *      --enable-vtable-verify
 *      --without-zstd
 *      --enable-lto
 *      --without-isl
 *      --enable-default-pie
 *      --enable-default-ssp

[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 #7 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to LE GARREC Vincent from comment #6)
> My log says :
> 
> >>> Configuring source in /var/tmp/portage/sys-devel/gcc-10.1.0-r2/work/gcc-10.1.0 ...
>  * CFLAGS="-march=native -O0 -ggdb2 -g2 -pipe -fno-omit-frame-pointer"
>  * CXXFLAGS="-march=native -O0 -ggdb2 -g2 -pipe -fno-omit-frame-pointer"

I don't think it works.  You can compile GCC compiler with -O0. But
you need to compile GCC run-time at least with -O.  Please add

CFLAGS_FOR_TARGET="-O2 -g"
CXXFLAGS_FOR_TARGET="-O2 -g"

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

[legarrec.vincent at gmail dot com]

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

--- Comment #8 from LE GARREC Vincent <legarrec.vincent at gmail dot com> ---
Thanks, you're right. I was able to build with

CFLAGS="-march=native -ggdb2 -g2 -pipe -fno-omit-frame-pointer -O0"
CXXFLAGS="-march=native -ggdb2 -g2 -pipe -fno-omit-frame-pointer -O0"

but with adding :
export CFLAGS_FOR_TARGET="-O2 -g"
export CXXFLAGS_FOR_TARGET="-O2 -g"

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

[legarrec.vincent at gmail dot com]

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

--- Comment #9 from LE GARREC Vincent <legarrec.vincent at gmail dot com> ---
For the record : the bug I opened in glibc bugzilla :
https://sourceware.org/bugzilla/show_bug.cgi?id=26260

Like gcc, glibc doesn't supports -O0