From mboxrd@z Thu Jan  1 00:00:00 1970
From: Joern Rennecke <amylaar@cygnus.co.uk>
To: mklein@dis.com (Mark Klein)
Cc: gas2@cygnus.com, egcs@cygnus.com
Subject: Re: Questions regarding submittals
Date: Mon, 07 Sep 1998 13:54:00 -0000
Message-id: <199809072053.VAA01106@phal.cygnus.co.uk>
References: <3.0.3.32.19980905122057.00a5d100@garfield.dis.com>
X-SW-Source: 1998/msg00219.html

> The hack that I used is to create a new pseudo directive in gas called
> .compiler that takes a string argument in order to update the Compilation
> Unit for each module. I modified ASM_IDENTIFY_GCC to include this pseudo
> directive. However, that also means I needed to include the directive in
> gcc/config/pa/*.asm. For MPE and the HP3000, that's OK because gas is the
> only assembler available there. However, on HP-UX it is possible to not 
> use gas, and these directives would break that assembler.
> 
> Is there a better way to approach this in order to communicate the pertinent
> information to gas in order to generate the SOM Compilation Unit records 
> in BFD for MPE without breaking things elsewhere?

Where the existing ports need to emit this information, they use
FILE_ASM_OP - usually defined to something like file or .file,
or better, output_file_directive .
output_file_directive uses ASM_OUTPUT_MAIN_SOURCE_FILENAME or
ASM_OUTPUT_SOURCE_FILENAME, if defined.

output_file_directive can be called from ASM_FILE_START; e.g. look at
config/svr4.h .