Re: [Swig-devel] SVN needs Autoconf >= 2.60; docs say Autoconf >= 2.58

[Vallon, J. <Jus...@de...>]

>From: Vadim Zeitlin [mailto:vz...@ze...]
>
>On Thu, 19 Aug 2010 07:14:02 +0100 William S Fulton
><ws...@fu...> wrote:
>
>WSF> Maybe there is an autoconf conditional to define a macro only if
>WSF> autoconf is a certain version if the Tools/config version overrides
>WSF> the default one?
>
> This would be ideal but I don't know how to do it. Does anyone else?

The following only defines AC_PROG_SED if it is not already defined:

m4_ifdef([AC_PROG_SED], [] , [
    AC_DEFUN([AC_PROG_SED], [AC_PATH_PROG([SED], sed)])
])

This could be added to Tools/config/ax_path_generic.m4, or configure.in.

aclocal (actually autom4te) complains that AC_PROG_SED is m4_require'd but not m4_defun'd, but I believe that might be because autom4te is not really processing the macros, merely looking for dependencies.  Once aclocal.m4 is generated, subsequent steps do not give any warning about AC_PROG_SED being undefined.  I'm more of an autoconf hacker than expert, though.

-- 
-Justin