There does not directly seem to be an option in gcc to get mixed C and
assembler, but if you look at the assembly options there is the option
-a which produces an assembly listing while the assembler is doint it's
work.  You need to have h turned on and l=file for the listing file at 
the assembly level and -g turned on at the gcc level.  Since -Wa allows
one to pass assbler flags on to the assembler one can:

gcc -g -Wa,"-ahl=C2Asm.lst" C2Asm.c

to get an assembly listing of C2Asm.c which includes C source in the
listing file C2Asm.lst

Hope that helps.
johnh...

On Tue, 20 Mar 2001, Steve Grunza wrote:

> Date: Tue, 20 Mar 2001 14:34:43 -0500 (EST)
> From: Steve Grunza <grunza@ulticom.com>
> Reply-To: steven_grunza@ieee.org
> To: tech-kern@netbsd.org
> Subject: Getting mixed C & assembly output
> 
> Does anyone know the incantation to get gcc (running on port-i386) to
> generate an output file with the assembly code ready to assemble and 
> the C code kept as comments?  The -S option generates the assembly file
> (as does -save-temps) but the original C isn't included.  I'm trying
> to step through a device driver with ddb and knowing where I am
> with respect to the C code would be a big help.
> 
> Thanks for any help/info
> 
> Steven G.
> steven_grunza@ieee.org
> 
> 
> PS:
>   My normal system is down with an fsck'ing disk so please reply either
>   to steven_grunza@ieee.org or on this list.  Thanks again.
> 
>