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oulevon 02-26-2006 06:47 PM
Conditional Compilation
 
Hello,

I heard that you can conditionally compile something with the #ifdef and #endif. How can I do this. I've looked online but can't find anything. Here's what I'm doing:

Code:

#ifdef DEBUG

        printf("inside DEBUG block\n");

#endif
When I compile this with gcc -DEBUG -o test test.c, the statement is never executed. Am I doing something wrong?


Thanks for any help.

paulsm4 02-26-2006 08:09 PM
You're close.

You need "-D" (like you had), and the symbol is "DEBUG". So you were off by one "D":

Quote:
gcc -DDEBUG -o test test.c
You might also wish to consider this alternate syntax:
Code:
#if defined(DEBUG)

        printf("inside DEBUG block\n");

#endif

oulevon 02-26-2006 08:12 PM
Thanks again for your help.

paulsm4 02-26-2006 08:21 PM
My pleasure!


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