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 -g
-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 =.

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