preprocessor conditionals on g++ version

[monkeyking]

Is it possible to do preprocessor conditionals on the version of gcc. like


#if GCC_version< 4.0
#define old_defines
#endif



Futhermore is it possible to have diffent #defines for differnet platforms,

thanks if advance

[snova]

Yes. The macro is __GNUC__. I think there's another one.

There are also predefined macros for differing architecures, but I don't know what they are except 'i386'.

[PaulFr]

Perhaps http://gcc.gnu.org/onlinedocs/gcc-4.1.2/cpp/Common-Predefined-Macros.html will help.

[monkeyking]

I solved this,
for anyone reading this, a complete list of defines can be given with


echo "main(){}" | g++ -E -x c++ -dM -


The solution is this


#define GCC_VERSION (__GNUC__ * 10000 \
+ __GNUC_MINOR__ * 100 \
+ __GNUC_PATCHLEVEL__)

/* Test for GCC > 3.2.0 */
#if GCC_VERSION > 30200

But I can only make the compareson work for the ">" not "==" or "<".

This must be an error of mine?