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cgccnullwarningsgcc5.2

No warning when returning NULL with gcc

Using gcc 5.2.0, I noticed that this code does not generate a warning:

#include <stddef.h>

int function(void)
{
    return NULL;
}

void procedure(void)
{
    return NULL;
}

I used the flags -Wall -Wextra -std=c99 -pedantic and I am running archlinux. I am not sure why this code works fine on gcc, especially since clang 3.7.0 does generate a warning.

I also tried with older versions of gcc like 4.9 or 4.7 and they both generate warnings.

The warnings are:

warning: return makes integer from pointer without a cast

and

warning: ‘return’ with a value, in function returning void

I should mention that I tried compiling gcc 5.2 on Debian and the result is the same. So archlinux does not seem to be the problem.

What is the rationale? I cannot seem to find anything related to this anywhere else.

Thank you!

Solution

  • I filled a bug report here: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67730

    It was confirmed and is fixed for 5.3 it seems!

    Thanks for your help.