From: Sterten AT aol DOT com
Message-ID: <dd.17ab78f7.288b3222@aol.com>
Date: Sat, 21 Jul 2001 15:29:38 EDT
Subject: Re: assembly translation of a single C-command
To: eliz AT is DOT elta DOT co DOT il
CC: djgpp AT delorie DOT com
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Reply-To: djgpp AT delorie DOT com

here's, what the FAQ says:

 >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'.

not with GCC 2.03 on my computer.
The C-code is not in it. Although you can search for strings
and function-names, which gives some clues.
The C-code however is in  *.ii  with some blank lines and
included *.h files and comments deleted. But I could find no
reference (line-) numbers to the assembly code in *.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 `='.



I had tried all the suggestions and didn't get what I wanted , except
the last one.

I couldn't get that '-Wa,aln=foo.s'  working.


Finally I got the idea, that it could be meant to be:

'-Wa,-aln=foo.s' 

so I tried:

gcc -c -Wa,-aln=foo.s test1.c

which gave me some assembly output with hex-listing in foo.s ,
but still nothing with the corresponding C-commands.

When I get a larger program converted to assembly and
peek into foo.s , then it's hard to refind the 
locations corresponding to the interesting parts in
the C-program.



Guenter