[lkml]   [2005]   [Oct]   [30]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: 2.6.14 assorted warnings
On Gwe, 2005-10-28 at 03:30 -0400, Dave Jones wrote:
> gcc is dumb, it doesn't realise that the variable will be filled by another
> function if its passed thus..
> unsigned long foo
> bar(&foo)
> if (foo==1)
> ...
> With bar() filling in content of foo.
> I believe there's at least once instance of this in gcc bugzilla.

gcc is a *LOT* smarter than you give it credit for. It will not warn for
cases where it isn't able to tell how foo is used passed with &foo. It
will warn for cases where it can

Compile the following program with and without -O2 and you'll see just
how smart gcc actually is

#include <stdio.h>

static void bar(char *x) {
*x = 1;

static void baz(char *x) {

int main(int argc, char *argv[]) {
char x,y;

printf("%c,%c\n", x, y);

So I'd go look deeper for real bugs


To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2005-10-30 22:49    [W:0.084 / U:37.776 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site