[Bug debug/94277] New: [9/10 Regression] error: undef.c: ‘-fcompare-debug’ failure (length) since r9-6413-g1db01ff96aa5ce5c

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94277

            Bug ID: 94277
           Summary: [9/10 Regression] error: undef.c: ‘-fcompare-debug’
                    failure (length) since r9-6413-g1db01ff96aa5ce5c
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: debug
          Assignee: unassigned at gcc dot gnu.org
          Reporter: marxin at gcc dot gnu.org
                CC: jakub at gcc dot gnu.org
  Target Milestone: ---

I see the following error:

$ cat undef.c
static void f();
void h() {
  f();
}

$ gcc -c undef.c -fcompare-debug
undef.c:1:13: warning: ‘f’ used but never defined
    1 | static void f();
      |             ^
gcc: error: undef.c: ‘-fcompare-debug’ failure (length)