[Bug middle-end/21059] New: Bogus warning about clobbered variable

["schwab at suse dot de" <gcc-bugzilla@gcc.gnu.org>]

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$ cat m68k-dis.i
typedef int (*fprintf_ftype) (void *, const char*, ...);
typedef struct disassemble_info {
  fprintf_ftype fprintf_func;
  void *stream;
  int (*read_memory_func) (void);
} disassemble_info;
extern char *foo (void);
typedef struct { } jmp_buf[1];
extern int setjmp (jmp_buf);
int
print_insn_m68k (disassemble_info *info)
{
  jmp_buf bailout;
  if (setjmp (bailout) != 0)
    return -1;
  info->fprintf_func (info->stream, foo ());
  return 0;
}
$ gcc/xgcc -B gcc/ -W -Wall -O2 -S m68k-dis.i -v
Reading specs from gcc/specs
Target: ia64-suse-linux
Configured with: ../configure --host=ia64-suse-linux --enable-shared --enable-threads --enable-__cxa_atexit --with-system-zlib --with-system-libunwind
Thread model: posix
gcc version 4.0.0 20050416 (prerelease)
 gcc/cc1 -fpreprocessed m68k-dis.i -quiet -dumpbase m68k-dis.i -auxbase m68k-dis -O2 -W -Wall -version -o m68k-dis.s
GNU C version 4.0.0 20050416 (prerelease) (ia64-suse-linux)
        compiled by GNU C version 4.0.0 20050416 (prerelease).
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
m68k-dis.i: In function œôòøprint_insn_m68kœôòù:
m68k-dis.i:11: warning: argument œôòøinfoœôòù might be clobbered by œôòølongjmpœôòù or œôòøvforkœôòù

-- 
           Summary: Bogus warning about clobbered variable
           Product: gcc
           Version: 4.0.0
            Status: UNCONFIRMED
          Keywords: diagnostic
          Severity: normal
          Priority: P2
         Component: middle-end
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: schwab at suse dot de
                CC: gcc-bugs at gcc dot gnu dot org
GCC target triplet: ia64-*-*


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21059