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Re: AM_PROG_CC_C_O and subdir-objects

From: Ralf Wildenhues
Subject: Re: AM_PROG_CC_C_O and subdir-objects
Date: Fri, 19 May 2006 04:36:46 +0200
User-agent: Mutt/1.5.11+cvs20060403

Hi Lars,

* Lars Hecking wrote on Thu, May 18, 2006 at 07:14:10PM CEST:
>  Why does the 'subdir-objects' option require AM_PROG_CC_C_O?

>  I think I figured it out - the generated compile rules do something like
>  $CC -c -o dir/file.o dir/file.c, is that correct?

Yes.  Actually, per-target compile flags require AM_PROG_CC_C_O as well
(and that is a very common case), only that Automake 1.9.6 forgot to
notice that.  This has been fixed in the CVS version of Automake, but
also the requirement for AM_PROG_CC_C_O in both cases has been made a
portability warning, not a hard error.

That way, with Automake-1.10 I guess you will be able to ignore the
portability warning (you need -Wportability or -Wall to even see it),
just your code won't work with a losing compiler.  This is more
reasonable: it may, for completely unrelated reasons, not work with such
a compiler anyway.

>  This is kind of obscure, though, and the connection should be documented.

Probably.  I'm working on a patch to implement AM_PROG_{CXX,F77,FC}_C_O
as well, I may look into adding such a note.


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