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Re: using target-specific variables?

From: Ralf Wildenhues
Subject: Re: using target-specific variables?
Date: Thu, 12 May 2005 12:26:58 +0200
User-agent: Mutt/1.4.1i

Hi Harald,

* Harald Dunkel wrote on Thu, May 12, 2005 at 10:45:40AM CEST:
> How can I use target-specific variables in Makefiles
> generated by Automake?

In general, that is not possible.
For specific variables, like CFLAGS, CPPFLAGS, you may do this by using

  target_CFLAGS = ...

> My says something like
>       lib_LIBRARIES = libmylib.a libmylib_gcc3.a
>       libmylib_a_SOURCES      = foo.c bar.c
>       libmylib_gcc3_a_SOURCES = $(libmylib_a_SOURCES)

so in this case that would be

but for the compiler (CC, CXX, ..) this is not implemented.
Rationale: if you change the compiler, you most likely need to have a
separate configuration (configure, for it.  That may be
achieved by using a subpackage (see Automake docs on this subject).

There is a workaround, however: you can override the value of CC in a  I use this, for example, to invoke a compiler wrapper
(mpicc) in one subdir, and use the compiler itself in all others.

The subpackage solution is much safer, however.

>       libmylib_gcc3.a: CC=gcc3

This will not work.  It states that libmylib_gcc3.a depends on a file
called "CC=gcc3", I believe, from recalling portable `make' syntax.


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