Re: Changing build steps with automake

[Ralf Wildenhues]

Hi Jan,

* Honza wrote on Tue, Apr 05, 2011 at 03:29:37PM CEST:
> I'm new to autotools and have not found the answer to my question in
> documentation so I decided to ask here. I need to change/add compilation
> steps in opencore-amr project, which uses autotools to generate makefiles.
> 
> I'd like to have following procedure
> 1. run gcc with -S producing asm code
> 2. perform a sed editing on resulting asm files
> 3. compile edited asm files
> 
> Is there any way how to alter Makefile.am to reach demanded behaviour,
> please? It would be easy when using simple Makefile, but I have no idea in
> this situation.

Automake is surprisingly inflexible in this area.  Here's a couple of
ideas.

1) If your project doesn't use per-target compile flags, you can just
write

.c.o:
        ...
.c.obj:
        ...

and maybe
.c.lo:
        ...

rules that do this for you.  Look at what automake puts in Makefile.in,
use that as staring point in your Makefile.am and adjust.


2) If your project uses per-target compile flags, the most fool-proof
way would be to use a wrapper script for the compiler, and then near the
end of configure.ac

CC="\${top_srcdir}/path/to/wrapper $CC"
(or top_builddir if you need to generate the wrapper)

and let the wrapper do the steps for you.


Hope that helps.  If not, it can help to show what you've got, and
errors.

Cheers,
Ralf