Why isn't -funsigned-char working?

[Rob Landley]

On Monday 17 April 2006 10:37 pm, Rich Felker wrote:
> On Mon, Apr 17, 2006 at 09:40:13PM -0400, Rob Landley wrote:
> > We're feeding in -funsigned-char, I can see it on the command line when I
> > go V=1.  And yet, when I go:
> >
> > char c=255;
> > printf("%d",c);
> >
> > I get -1.  Why is that?
>
> With -funsigned-char? It prints 255 for me with -funsigned-char and -1
> without, which is the expected behavior.

going "gcc -funsigned-char hello.c" works, sure.  But something in the 800 
options our build system is supplying seems to be switching it off:

gcc -I/home/landley/busybox/busybox/include 
-I/home/landley/busybox/busybox/include -I -funsigned-char 
-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Wall 
-Wstrict-prototypes -Wshadow -Os -march=i386 -mpreferred-stack-boundary=2 
-falign-functions=1 -falign-jumps=1 -falign-loops=1 -fomit-frame-pointer 
-D_GNU_SOURCE -DNDEBUG -Wstrict-prototypes -Wmissing-prototypes 
-Wmissing-declarations -c 
-o /home/landley/busybox/busybox/coreutils/cat.o /home/landley/busybox/busybox/coreutils/cat.c

Appears to be switching it off.

Try adding this to the start of cat_main():

char cc;
cc=120;
cc+=100;
printf("test %d\n",cc);

When I run that, I get:
./busybox cat
test -36

Rob
-- 
Never bet against the cheap plastic solution.