linux - Detecting 64bit compile in C

Question

is there a C macro or some kind of way that i can check if my c program was compiled as 64bit or 32bit at compile time in C?

Compiler: GCC Operating systems that i need to do the checks on: Unix/Linux

Also how could i check when running my program if the OS is capable of 64bit?

Answer 1

Since you tagged this "gcc", try

#if __x86_64__
/* 64-bit */
#endif