On Sat, 2009-03-28 at 07:27 -0600, Eric Blake wrote:
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> According to Braden McDaniel on 3/27/2009 11:02 PM:
> > When I try to use AC_LANG_PROGRAM in conjunction with AC_EGREP_CPP, I'm
> > seeing this error:
> >
> > configure.ac:97: error: possibly undefined macro: AC_LANG_PROGRAM
> > If this token and others are legitimate, please use m4_pattern_allow.
> > See the Autoconf documentation.
>
> It sounds like something is overquoted in your configure.ac file.
>
> >
> > My invocation of AC_EGREP_CPP looks like this:
> >
> > AC_EGREP_CPP([HAVE_GL_GLU_H], [AC_LANG_PROGRAM([[foo]], [[bar]])],
> > [OPENVRML_HAVE_GL_GLU_H=1],
> > [OPENVRML_HAVE_GL_GLU_H=0])
>
> In isolation, I don't see any quoting problems with this example. But I'm
> almost certain you didn't copy and paste from your configure.ac, so maybe
> in the rewrite for this email, you changed the quoting?
In fact, that was copied and pasted from my configure.ac. (Though it's
not what my configure.ac looks like now; I've given up on this approach
for now and I'm using AC_COMPILE_IFELSE instead.)
All I'm trying to do here is see if running a previous macro caused a
symbol to be AC_DEFINE'd. I tried a number of different invocations of
AC_LANG_PROGRAM; including using no arguments, using one argument, and
using an empty first argument.
> > If I have an instance of AC_LANG_PROGRAM usage earlier in the file that
> > has been working fine. However, the error message will point to it.
> > Only if I remove the first occurrence does the error message point at
> > the second invocation (the one mentioned listed above).
>
> Can you post a complete configure.ac file that reproduces the problem
> (preferably trimming to a minimal testcase first), so we can see if
> something earlier in the file may be impacting how this line is expanded?
I'm having no trouble reproducing this error with a *very* minimal test
case. It's attached.
--
Braden McDaniel e-mail: <braden@xxxxxxxxxxxxx>
<http://endoframe.com> Jabber: <braden@xxxxxxxxxx>
AC_INIT([ac-egrep-cpp-test], [1.0.0], [braden@xxxxxxxxxxxxx])
AC_EGREP_CPP([HAVE_GL_GLU_H], [AC_LANG_PROGRAM([[foo]], [[bar]])],
[OPENVRML_HAVE_GL_GLU_H=1],
[OPENVRML_HAVE_GL_GLU_H=0])
AC_OUTPUT
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