Hi,
I have a problem with undef and diagnostic pragma and I am not sure if I am
doing something wrong or it's a GCC bug.
The following code:
#pragma GCC diagnostic ignored "-Wundef"
#if FOO
#endif
int main (void) { return 42; }
compiled in this way:
gcc -o test test.c -Wundef -Werror
does not give any error.
On the contrary if I compile it with g++
g++ -o test test.c -Wundef -Werror
gives
test.c:2:5: error: "FOO" is not defined [-Werror=undef]
cc1plus: all warnings being treated as errors
gcc version is:
gcc (Debian 4.7.0-8) 4.7.0
Why does preprocessor have this different behavior?
