DJGPP FAQ -- How to get GCC to generate assembly code

www.delorie.com/djgpp/v2faq/faq070.html

search

8.20 How to get GCC to generate assembly code

Q: How can I peek at the assembly code generated by GCC?

Q: How can I create a file where I can see the C code and its assembly translation together?

A: Use the -S (note: capital S) switch to GCC, and it will emit the assembly code to a file with a .s extension. For example, the following command:

       gcc -O2 -S -c foo.c

will leave the generated assembly code on the file foo.s. If you want to see the C code together with the assembly it was converted to, use a command line like this:

      gcc -c -Wa,-a,-ad [other GCC options] foo.c > foo.lst

which will output the combined C/assembly listing to the file foo.lst.

If you need to both get the assembly code and to compile/link the program, you can either give the -save-temps option to GCC (which will leave all the temporary files including the .s file in the current directory), or use the -Wa,aln=foo.s option which instructs the assembler to output the assembly translation of the C code (together with the hex machine code and some additional info) to the file named after the =.

webmaster donations bookstore	delorie software privacy
Copyright ⌐ 1998 by Eli Zaretskii	Updated Sep 1998

You can help support this site by visiting the advertisers that sponsor it! (only once each, though)