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List:       autoconf
Subject:    Re: AM_CONDITIONAL
From:       Ralf Wildenhues <Ralf.Wildenhues () gmx ! de>
Date:       2005-08-14 18:24:14
Message-ID: 20050814182414.GA3034 () uni-bonn ! de
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Hi Russell,

* Russell Shaw wrote on Sun, Aug 14, 2005 at 07:21:43PM CEST:
> In configure.in, i have:
> 
>   AM_CONDITIONAL(ENABLE_GTK_DOC, test x$enable_gtk_doc = xyes)
> 
> and it gets turned into:
> 
> if test x$enable_gtk_doc = xyes; then
>   ENABLE_GTK_DOC_TRUE=
>   ENABLE_GTK_DOC_FALSE='#'
*snip*
> 
> Isn't this backward? When enable_gtk_doc = yes, then this will be
> *false* in the makefile:

Nope.  It may seem so, but it's not, because this:

> if ENABLE_GTK_DOC_TRUE
| bla
| else
| blubb
| endif

will turn into
| @ENABLE_GTK_DOC_TRUE@bla
| @ENABLE_GTK_DOC_FALSE@blubb

in Makefile.in.  However, strictly speaking this is an implementation
detail you should not have to worry about at all (and should not rely 
on either).

Cheers,
Ralf



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