Re: Problem using AC_LANG_PROGRAM with AC_EGREP_CPP

[Eric Blake]

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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?

> 
> 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?

- --
Don't work too hard, make some time for fun as well!

Eric Blake             address@hidden
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