[Bug c/12180] New: Inline optimization for variadic function fails for sparc* targets

["martin at netbsd dot org" <gcc-bugzilla at gcc dot gnu dot org>]

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12180

           Summary: Inline optimization for variadic function fails for
                    sparc* targets
           Product: gcc
           Version: 3.3.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: martin at netbsd dot org
                CC: gcc-bugs at gcc dot gnu dot org,martin at netbsd dot org
 GCC build triplet: sparc64--netbsd
  GCC host triplet: sparc64--netbsd
GCC target triplet: sparc64--netbsd

I noticed this when trying to build mpg123 on NetBSD/sparc64. Matthew Green and
I reduced it to a small example code:

Store this in test.c:
--8<--
typedef char * va_list;

void generic_sendmsg (char *fmt, ...)
{
        va_list ap;

        (void)(__builtin_next_arg(fmt), (ap) = (va_list)__builtin_saveregs());
}

void generic_sendstat()
{
        double t;

        generic_sendmsg("F %3.2f", t);
}
-->8--

Then try:

$ cc -c -O3 test.c
test.c: In function `generic_sendstat':
test.c:7: error: `va_start' used in function with fixed args
$

But:
$ cc -c -O3 -fno-inline test.c
$

The problem does not happen for non-sparc targets (AFAICT)