[Bug target/97865] libtool needs to be updated for Darwin20.

[cvs-commit at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97865

--- Comment #31 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-9 branch has been updated by Iain D Sandoe
<ia...@gcc.gnu.org>:

https://gcc.gnu.org/g:3d29d0d630caac54dbcc6c3fb961258a011a30fc

commit r9-9497-g3d29d0d630caac54dbcc6c3fb961258a011a30fc
Author: Iain Sandoe <i...@sandoe.co.uk>
Date:   Wed Nov 18 10:06:03 2020 +0000

    Darwin : Update libtool and dependencies for Darwin20 [PR97865]

    The change in major version (and the increment from Darwin19 to 20)
    caused libtool tests to fail which resulted in incorrect build settings
    for shared libraries.

    We take this opportunity to sort out the shared undefined symbols state
    rather than propagating the current unsound behaviour into a new rev.

    This change means that we default to the case that missing symbols are
    considered an error, and if one wants to allow this intentionally, the
    confiuration for that case should be set appropriately.

    Three existing cases need undefined dynamic lookup:
     libitm, where there is already a configuration mechanism to add the
             flags.
     libcc1, where we add simple configuration to add the flags for Darwin.
     libsanitizer, where we can add to the existing extra flags.

            Backported from 1352bc88a0525743c952197fb2db6e4f8c091cde and
5dc998933e7aa737f4a45a8a2885d42d5288d51a

    libcc1/ChangeLog:

            PR target/97865
            * Makefile.am: Add dynamic_lookup to LD flags for Darwin.
            * configure.ac: Test for Darwin host and set a flag.
            * Makefile.in: Regenerate.
            * configure: Regenerate.

    libitm/ChangeLog:

            PR target/97865
            * configure.tgt: Add dynamic_lookup to XLDFLAGS for Darwin.
            * configure: Regenerate.

    libsanitizer/ChangeLog:

            PR target/97865
            * configure.tgt: Add dynamic_lookup to EXTRA_CXXFLAGS for
            Darwin.
            * configure: Regenerate.

    ChangeLog:

            PR target/97865
            * libtool.m4: Update handling of Darwin platform link flags
            for Darwin20.

    gcc/ChangeLog:

            PR target/97865
            * configure: Regenerate.

    libatomic/ChangeLog:

            PR target/97865
            * configure: Regenerate.

    libbacktrace/ChangeLog:

            PR target/97865
            * configure: Regenerate.

    libffi/ChangeLog:

            PR target/97865
            * configure: Regenerate.

    libgfortran/ChangeLog:

            PR target/97865
            * configure: Regenerate.

    libgomp/ChangeLog:

            PR target/97865
            * configure: Regenerate.

    libhsail-rt/ChangeLog:

            PR target/97865
            * configure: Regenerate.

    libobjc/ChangeLog:

            PR target/97865
            * configure: Regenerate.

    libphobos/ChangeLog:

            PR target/97865
            * configure: Regenerate.

    libquadmath/ChangeLog:

            PR target/97865
            * configure: Regenerate.

    libssp/ChangeLog:

            PR target/97865
            * configure: Regenerate.

    libstdc++-v3/ChangeLog:

            PR target/97865
            * configure: Regenerate.

    libvtv/ChangeLog:

            PR target/97865
            * configure: Regenerate.

    zlib/ChangeLog:

            PR target/97865
            * configure: Regenerate.

    Co-Authored-By: Jakub Jelinek  <ja...@redhat.com>