compile a 32-bit application in 64-bit Linux

Create main.cpp with your code..


For 32 bit version:

$ gcc -m32 -o output32 main.cpp


For 64 bit version :

$ gcc -m64 -o output64 main.cpp

Example:

#include 
int main()
{
   long lTemp;
   printf("Long int size is %i bytes long!\n", sizeof(lTemp));
    return 0;
}

Output: ( Both output taken in same machine )

$ ./outpu32
 Long int size is 4 bytes long!

$./output64

Long int size is 8 bytes long!

$ getconf LONG_BIT
64