Some issues with handling null-string arguments in printf()

[mr.Noisy]

The program

#include <cstdio>

int main()
{
    char* p = 0;
    printf("%s \n", p);
    printf("%s\n", p);
    return 0;
}

will crash on second printf. Haiku hrev40200 GCC4 Hybrid

[mr.Noisy]

First call of printf() function puts (null) to the stdout.

[phoudoin]

The culprid is gcc, which optimize printf("%s\n", arg) into puts(arg).

See here:

• ​http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15685
• ​http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25609

This can't be fixed in libroot. Sorry. One workaround: use gcc's -fno-builtin-printf option.