[Bug c/17211] New: [sparc/i386]: Bitfields should be *unsigned* by default.

[terra at gnome dot org]

http://www.caldera.com/developers/devspecs/abi386-4.pdf on page 32 makes it
clear that "int x : 5" should have the range 0-31.  Sun's C compiler has the
same idea on solaris.

The conform to the ABIs, -funsigned-bitfields therefore needs to be the default
for i386 and sparc at least.


-------------------------------------------------------------------------------
#include <stdio.h>

int main (int argc, char **argv)
{
  struct Foo {
    int x : 5;
  } foo;

  foo.x = 31;

  printf ("%d\n", foo.x);
  return 0;
}


Solaris:
> gcc-3.4 -std=c99 ~/foo.c
./a.out 
-1
/opt/SUNWspro/bin/cc -xc99 ~/foo.c
./a.out 
31


Linux/x86, gcc 3.3.1:
Same as gcc-3.4 on solaris.

-- 
           Summary: [sparc/i386]: Bitfields should be *unsigned* by default.
           Product: gcc
           Version: 3.4.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: terra at gnome dot org
                CC: gcc-bugs at gcc dot gnu dot org
  GCC host triplet: sparc-sun-solaris2.8, i586-suse-linux


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17211