[Bug c/107156] New: ice in lookup_attribute_by_prefix, at attribs.h:239

[dcb314 at hotmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107156

            Bug ID: 107156
           Summary: ice in lookup_attribute_by_prefix, at attribs.h:239
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dcb314 at hotmail dot com
  Target Milestone: ---

For testsuite file ./gcc.dg/c2x-attr-noreturn-1.c, with recent gcc, I get this:

[/home/dcb/gcc/trunk.git/gcc/testsuite] $ /home/dcb/gcc/results/bin/gcc -c -w
-O2 ./gcc.dg/c2x-attr-noreturn-1.c
during IPA pass: icf
./gcc.dg/c2x-attr-noreturn-1.c:56:1: internal compiler error: in
lookup_attribute_by_prefix, at attribs.h:239
   56 | [[noreturn]] int main ();
      | ^
0x1bd9afe lookup_attribute_by_prefix(char const*, tree_node*)
        ../../trunk.git/gcc/attribs.h:239

Please not I am not using any -std= flag.

The bug first seems to occur sometime between git hash f758d447d7f46992
and 43faf3e5445b5717, which is about 50 commits.