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Subject: [Bug bootstrap/98860] [11 Regression] bootstrap failure on MinGW-w64
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Date: Wed, 31 Mar 2021 07:12:25 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98860

--- Comment #58 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jakub Jelinek <jakub@gcc.gnu.org>:

https://gcc.gnu.org/g:a49a96f681bf13c6e77644d4507e867f00f93fe6

commit r11-7923-ga49a96f681bf13c6e77644d4507e867f00f93fe6
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Wed Mar 31 09:11:29 2021 +0200

    i386, debug: Default to -gdwarf-4 on Windows targets with broken ld.bfd
[PR98860]

    As mentioned in the PR, before the
=20=20=20
https://sourceware.org/git/?p=3Dbinutils-gdb.git;a=3Dcommit;h=3Dba6eb62ff0e=
a9843a018cfd7cd06777bd66ae0a0
    fix from March 1st, PECOFF ld.bfd didn't know about .debug_loclists,
    .debug_rnglists and other debug sections new in DWARF 5.  Unfortunately,
    unlike for ELF linkers, that means the sections were placed in wrong
    ordering with wrong VMA/LMA, so the resulting executables are apparently
    unusable.

    As that is pretty new change, newer than 2.35.2 or 2.36 binutils releas=
es,
    the following patch adds a workaround that turns -gdwarf-4 by default
    instead of -gdwarf-5 if a broken linker is found at configure time.
    Users can still explicitly play with -gdwarf-5 and either use a non-bro=
ken
    linker or use custom linker scripts for the broken one, but at least
    by default it should work.

    2021-03-31  Jakub Jelinek  <jakub@redhat.com>

            PR bootstrap/98860
            * configure.ac (HAVE_LD_BROKEN_PE_DWARF5): New AC_DEFINE if PEC=
OFF
            linker doesn't support DWARF sections new in DWARF5.
            * config/i386/i386-options.c (ix86_option_override_internal):
Default
            to dwarf_version 4 if HAVE_LD_BROKEN_PE_DWARF5 for TARGET_PECOFF
            targets.
            * config.in: Regenerated.
            * configure: Regenerated.=