[Bug driver/61065] New: [4.9/4.10 Regresion] invalid args to -fsanitize should be an error not a warning

[doko at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=61065

            Bug ID: 61065
           Summary: [4.9/4.10 Regresion] invalid args to -fsanitize should
                    be an error not a warning
           Product: gcc
           Version: 4.8.3
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: driver
          Assignee: unassigned at gcc dot gnu.org
          Reporter: doko at gcc dot gnu.org

[forwarded from https://bugs.debian.org/745105]

With gcc-4.8 this works because -fsanitize=address works in 4.8:

    > gcc-4.8 -fsanitize=address test.c -o /dev/null

and this fails and exits with non-zero because -fsanitize=integer
is not supported in 4.8:

    > gcc-4.8 -fsanitize=integer test.c -o /dev/null
    gcc-4.8: error: unrecognized command line option ‘-fsanitize=integer’
    > echo $?
    1

Now for 4.9:

    > gcc-4.9 -fsanitize=integer test.c -o /dev/null
    gcc-4.9: warning: unrecognized argument to -fsanitize= option: ‘integer’
    cc1: warning: unrecognized argument to -fsanitize= option: ‘integer’
    > echo $?
    0

This should exit with non-zero so that support for this flag can correctly
be detected in things line autoconf generated configure scripts.