mark.urs@gmail.com

mark.urs@gmail.com

[Mark U]

Hi,

I'm just curious to know whether there is any option in GNU GCC to get
the C code  and the corresponding asembly.

like if we give '-S' option for GCC it gives the assembly of the program
#gcc  -S test.c
gives test.S

I want to know the option for getting something like
--------------------------
printf()
<ASSEMBLY of printf>
fn();
<ASSEMBLY FOR JUMPING TO FN>
--------------------------
for a program
----------------
printf()
fn();
----------------

Thanks and regards,
Mark

Re: mark.urs@gmail.com

[Kai Ruottu]

Mark U kirjoitti:
> Hi,
>
> I'm just curious to know whether there is any option in GNU GCC to get
> the C code  and the corresponding asembly.
 The problem with this issue is that it is explained in the GNU 
assembler manual,
not in the GCC manual :-(   The expectation however seems to be that it 
is explained
in the GCC manual !  Anyhow the 'as' manual tells in the Chapter 2 :

"If you are invoking as via the gnu C compiler, you can use the `-Wa' 
option to pass
arguments through to the assembler. The assembler arguments must be 
separated
from each other (and the `-Wa') by commas. For example:
gcc -c -g -O -Wa,-alh,-L file.c
This passes two options to the assembler: `-alh' (emit a listing to 
standard output with
high-level and assembly source) and `-L' (retain local symbols in the 
symbol table)."

The debug option '-g' causes the row number and source info being added 
into the
output for 'as'.  The listing comes to the standard output so a 
redirection into a file can
be a better solution....