/**
Minimal example of gcc not printing warning coming from preprocessor generated
code.

It contains a line that generates tautological-compare warning. But the line is
generated by a preprocessor macro and the warning is not generated, unless
preprocessing and compilation are done in separate steps.

When compiled as:

    gcc -Wall main.c

the warning about tautological compare is *not shown*. But when compiled as:

    gcc -Wall -no-integrated-cpp main.c

or as:

    gcc -Wall -E main.c -o main.i
    gcc -Wall --preprocessed main.i

then this warning is printed:

main.c: In function ‘main’:
main.c:31:11: warning: self-comparison always evaluates to false [-Wtautological-compare]
  FOO
           ^ 

The issue was observed with:
gcc 6.2 for ARM built by OpenEmbedded
gcc 6.3 for x86_64 from Arch Linux
gcc 7.0 for x86_64 built from upstram git (commit ae4f1e0ee12)

*/


#define FOO if (argc != argc) return 1;
    
int main(int argc, char **argv) 
{
	FOO
	return 0;
}