How to overcome vc++ warning C4003 while writing common code for both gcc and vc++
I have a code that is compiled in both gcc and vc++. The code has a common macro which is called in two scenarios.
- When we pass some parameters to it.
- When we don't want to pass any parameters to it.
An example of such a code is:
#define B(X) A1##X
int main() {
int B(123), B();
return 0;
}
The expect output from the pre-processing step of compilation is:
int main() {
int A1123, A1;
return 0;
}
The output for both gcc and vc++ is as expected, but vc++ gives a warning:
warning 开发者_运维知识库C4003: not enough actual parameters for macro 'B'
How can I remove this warning and yet get the expected output?
Thanks.
This might work depending on your VC++ version, etc
#define B(...) A1##__VA_ARGS__
I don't know if vc++ will like an empty va args but its worth a shot - let me know if that works :)
For Visual C++ you need to use the #pragma warning directive. The warning you are getting is C4003 (C => Compiler), 4003 => warning number.
#pragma warning (disable: 4003)
#define B(X) A1##X
int main() {
int B(123), B();
return 0;
}
Not sure about GCC, but I suspect you can opt to not define this pragma for GCC and suppress the warning (if any some other way).
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