[Bug build/26260] New: undefined reference to `_Unwind_Resume'

[Bug build/26260] New: undefined reference to `_Unwind_Resume'

[sourceware@le-garrec.fr]

https://sourceware.org/bugzilla/show_bug.cgi?id=26260

            Bug ID: 26260
           Summary: undefined reference to `_Unwind_Resume'
           Product: glibc
           Version: 2.31
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: build
          Assignee: unassigned at sourceware dot org
          Reporter: sourceware@le-garrec.fr
                CC: carlos at redhat dot com
  Target Milestone: ---

I can't build glibc if gcc was built with -O0 option. I open a bug in the GCC
project (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96217) but they told me
the problem was in glibc.

The glibc 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'

The solution is to make a change in Makeconfig :
from
gnulib = -lgcc $(gnulib-arch)
to
gnulib = -lgcc -lgcc_eh $(gnulib-arch)

What do you think of this change ? Do you think that glibc should supports -O0
compilation ?

-- 
You are receiving this mail because:
You are on the CC list for the bug.

[Bug build/26260] undefined reference to `_Unwind_Resume'

[sourceware@le-garrec.fr]

https://sourceware.org/bugzilla/show_bug.cgi?id=26260

LE GARREC Vincent <sourceware@le-garrec.fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |sourceware@le-garrec.fr

-- 
You are receiving this mail because:
You are on the CC list for the bug.

[Bug build/26260] undefined reference to `_Unwind_Resume'

[joseph at codesourcery dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=26260

--- Comment #1 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
Linking libc with libgcc_eh is not correct.  See the four-paragraph 
comment on the definitions of libunwind, gnulib and related variables for 
an explanation.  There are various requirements on libgcc and the GCC 
build process to avoid such circular dependencies and to ensure that a 
stripped glibc binary built with an inhibit_libc GCC is identical to one 
built following a longer sequence of alternating GCC and glibc builds.  
It seems you've found another such requirement: libgcc must not be built 
in a way that introduces references to EH symbols in the code statically 
linked into shared libc.

glibc does not itself support being built with -O0 either.  It would be 
desirable to do so, but there might still be requirements in that case for 
some individual files or functions to be compiled with optimization.  
Likewise, even if a libgcc mostly built with -O0 works for building glibc, 
it seems optimization might be required for building some files therein.

-- 
You are receiving this mail because:
You are on the CC list for the bug.