Re: is this a good way to use AC_CHECK_HEADERS

[Bob Friesenhahn]

On Fri, 3 Jun 2005, Ed Hartnett wrote:
> > Another way is to define a new variable "HDF5INCLUDES" and export for
> > substitution so it may be substituted in the Makefile.  The
> > substitution on the Makefile may be used to pass it to a CPPFLAGS
> > definition.
>
> Yes, but the AC_CHECK_HEADERS program doesn't compile with it, and
> that's done by configure, not a makefile.

What I do for my own application is to build up CPPFLAGS, LDFLAGS, 
etc., for configure's benefit, but then export much of this data 
explictly for use in the Makefile depending on how the software is 
actually built.  For example, when building loadable modules, only 
certain modules need particular flags and libraries.  There is a 
"common" part and a "difference" part.

The value of CPPFLAGS that configure saves is whatever it ends up 
being at the end of the configure run (at the time config.status is 
output) so you can overwrite it with whatever abbreviated version you 
like.

Bob
======================================
Bob Friesenhahn
address@hidden, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/