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    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


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      Last update: 2005-10-30 22:49    [W:0.020 / U:22.392 seconds]
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