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From: "matoro_gcc_bugzilla at matoro dot tk" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug driver/112759] New: [13 regression] mips -march=native
 detection broken with gcc 13+
Date: Wed, 29 Nov 2023 07:10:14 +0000
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X-Bugzilla-Component: driver
X-Bugzilla-Version: 13.1.0
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D112759

            Bug ID: 112759
           Summary: [13 regression] mips -march=3Dnative detection broken
                    with gcc 13+
           Product: gcc
           Version: 13.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: driver
          Assignee: unassigned at gcc dot gnu.org
          Reporter: matoro_gcc_bugzilla at matoro dot tk
  Target Milestone: ---

Since gcc 13 - and presumably 66c48be23e0fa5ee7474b4b078e013f901c71eed since
that is the only recent change to this area - detection of -march=3Dnative =
on
mips is broken, defaulting to mips1.

With gcc 13:
# gcc -march=3Dnative -Q --help=3Dtarget | grep "arch=3D" | head -n 1
  -march=3DISA                            mips1
# gcc --version
gcc (Gentoo 13.2.1_p20231014 p9) 13.2.1 20231014

With gcc 12:
# gcc -march=3Dnative -Q --help=3Dtarget | grep "arch=3D" | head -n 1
  -march=3DISA                            octeon2
# gcc --version
gcc (Gentoo 12.3.1_p20230825 p2) 12.3.1 20230825

Contents of my /proc/cpuinfo are attached.  strace seems to indicate that i=
t is
reading the data at least:

openat(AT_FDCWD, "/proc/cpuinfo", O_RDONLY) =3D 3
statx(3, "", AT_STATX_SYNC_AS_STAT|AT_NO_AUTOMOUNT|AT_EMPTY_PATH,
STATX_BASIC_STATS, {stx_mask=3DSTATX_BASIC_STATS|STATX_MNT_ID, stx_attribut=
es=3D0,
stx_mode=3DS_IFREG|0444, stx_size=3D0, ...}) =3D 0
read(3, "system type\t\t: EBB6800 (CN6880p2"..., 1024) =3D 1024
close(3)                                =3D 0=