Some Usages of GCC

gcc has a very large number of options. Here I am writing some of them to help remember some common usages.

Generating Assembly Code

Using gcc with -S option will generated assembly code and then stop. For example:

    $ gcc -S helloworld.c

Preprocessing                

Using gcc with -E will only run preprocessor.

   $ gcc   -E helloworld.c -o helloworld.i

Output asm instructions using selected dialect

• Intel dialect: $ gcc -S -masm=intel helloworld.c
• AT&T dialect: $ gcc -S -masm=att helloworld.c