assembly listings

[Nick Clifton]

Hi Ali,

> I have created an assembly file by gcc named prog1.s. Then:
> as -ah ./prog1.s
> Why high level listing can not be seen?

Because you compiled prog1.s without debugging enabled, and you are 
creating a listing without including any assembler output  For example:

   % gcc -S hello.c
   % as -ahl=hello.list hello.s -o hello.o
   % grep printf hello.list

     14 0010 E8FCFFFF              call    printf

   % gcc -S -g hello.c
   % as -ahl=hello.list hello.s -o hello.o
   % grep printf hello.list

    1:hello.c       **** extern int printf (const char *, ...);
    2:hello.c       **** int main (void) { return printf ("hello 
world\n"); }
   31 0010 E8FCFFFF              call    printf

You need to pass -g to gcc in order to include debugging info in the 
assembler outout file.  The assembler needs this in order to be able to 
locate the high level source file(s) associated with the input assembly 
source file.

You need to include the 'l' option in the -a assembler option in order 
to generate a listing output.  (The 'h' option is a qualifier that is 
applied to the 'l' option.  If 'h' is present but 'l' is not then you do 
not get any output).

Cheers
   Nick