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From: "glaubitz at physik dot fu-berlin.de" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/95381] [11 Regression]: Bootstrap on m68k fails with
 ICE: in operator[], at vec.h:867
Date: Tue, 29 Dec 2020 10:42:08 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D95381

--- Comment #9 from John Paul Adrian Glaubitz <glaubitz at physik dot fu-be=
rlin.de> ---
I have bisected this now and it turns out, the regression was introduced by:

commit eede1a6bf3a4f33fa5afef9e4dfc80c4dd89eeb3
Author: Nick Clifton <nickc@redhat.com>
Date:   Mon Jun 18 10:39:01 2018 +0000

    Ensure that control characters in user supplied error and warning messa=
ges
are escaped.

            PR 84195
            * tree.c (escaped_string): New class.  Converts an unescaped
            string into its escaped equivalent.
            (warn_deprecated_use): Use the new class to convert the
            deprecation message, if present.
            (test_escaped_strings): New self test.
            (test_c_tests): Add test_escaped_strings.

    From-SVN: r261697

Interestingly, later SVN/git revisions still built fine, with 20191130 being
the last good one:

> https://buildd.debian.org/status/logs.php?pkg=3Dgcc-snapshot&arch=3Dm68k

I am building with the following command line:

../configure --with-gcc-major-version-only --program-prefix=3D --enable-sha=
red
--enable-linker-build-id --disable-nls --enable-clocale=3Dgnu
--enable-libstdcxx-time=3Dyes --with-default-libstdcxx-abi=3Dnew
--enable-gnu-unique-object --disable-libssp --disable-libitm
--disable-libsanitizer --disable-libquadmath --disable-libquadmath-support
--enable-plugin --with-system-zlib --disable-libphobos --enable-objc-gc=3Da=
uto
--enable-multiarch --disable-werror --disable-werror --disable-multilib
--enable-checking=3Dyes --build=3Dm68k-linux-gnu --host=3Dm68k-linux-gnu
--target=3Dm68k-linux-gnu --enable-languages=3Dc++,jit --enable-host-shared
--disable-bootstrap && make -j64

from git. No local Debian patches applied.

My suspicion is that either this change triggers a bug in some external lib=
rary
or a change in an external library made this bug visible.

Any suggestions? The only thing that it's odd on m68k is the 16-bit native
alignment, but I'm not sure whether that's relevant here.=