Re: ifdef expessions in Makefile.am

[Joakim Tjernlund]

Ralf Wildenhues <address@hidden> wrote on 18/12/2009 08:45:41:

> From: Ralf Wildenhues <address@hidden>
> To: Joakim Tjernlund <address@hidden>
> Cc: Peter Johansson <address@hidden>, address@hidden
> Date: 18/12/2009 08:45
> Subject: Re: ifdef expessions in Makefile.am
>
> * Joakim Tjernlund wrote on Thu, Dec 17, 2009 at 11:29:19PM CET:
> > if @TEST@ then
> >  SUBDIRS+= dir1/dir2/@TEST@
> >  SUBDIRS+= dir3/dir2/@TEST@
> >  SUBDIRS+= dir4/@TEST@
> > ....
> > endif
>
> The syntax is
>   if TEST
>     SUBDIRS += ...
>   endif
>
> and there should not be any indentation of `if' and `endif', and at most
> spaces for indentation of variable assignments, no TABs.
>
> You already learned that running aclocal and autoconf is required;
> the first time you use AM_CONDITIONAL, the code of this macro needs to
> be added to your aclocal.m4 file.
>
> If you need to maintain a patch against a Libtool macro, then what most
> users do is write a bootstrap or autogen.sh script which consists of
> something like
>
>   libtoolize [--copy] [--install]
>   patch -p0 - <<EOF
>   here comes your patch text for m4/libtool.m4
>   EOF
>   aclocal -I m4
>   autoconf
>   automake -Wall

Yes, thanks for the script layout. What would be even
cooler is if one could add a custom macro in acinclude.m4
that would override the libtool.m4 macro creating the -fPIC option
and replace it with -fpic instead.

 Jocke