how do you check which compiler you are using in c++

Question

in the title

Answer 1

Exactly

Answer 2

why why why why WHY

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«_Superman_»
Microsoft MVP (Visual C++)

Answer 3

The compiler will predefine some macros that you can detect to determine which compiler you are using.

For example, Microsoft Visual C++ is defining _MSC_VER to a value:
 

MSVC++ 9.0   _MSC_VER = 1500
MSVC++ 8.0   _MSC_VER = 1400
MSVC++ 7.1   _MSC_VER = 1310
MSVC++ 7.0   _MSC_VER = 1300
MSVC++ 6.0   _MSC_VER = 1200
MSVC++ 5.0   _MSC_VER = 1100

You should be able to make use of something like #ifdef _MSC_VER and #if _MSC_VER > 1400 or whatever your specific needs are.


You can also detect symbols like __WIN32__ to detect if you are in a Windows build environment.  Some compilers will define __unix__ or __APPLE__ if your build environment is of that variety.

Or for gcc you can use something like this:

/* Test for GCC > 3.2.0 */
#if __GNUC__ > 3 || \
    (__GNUC__ == 3 && (__GNUC_MINOR__ > 2 || \
        (__GNUC_MINOR__ == 2 &&  __GNUC_PATCHLEVEL__ > 0))

You can also detect __STDC__ to see if you are using an ANSI C compiler.