ax_configure_args

Helper macro for AX_ENABLE_BUILDDIR and AX_ENABLE_BUILDDIR_UNAME

The traditional way of starting a subdir-configure is running the script with ${1+"$@"} but since autoconf 2.60 this is broken. Instead we have to rely on eval'ing $ac_configure_args however some old autoconf versions do not provide that. To ensure maximum portability of autoconf extension macros this helper can be AC_REQUIRE'd so that $ac_configure_args will alsways be present.

Sadly, the traditional "exec $SHELL" of the enable_builddir macros is spoiled now and must be replaced by "eval + exit $?".

Example:

   AC_DEFUN([AX_ENABLE_SUBDIR],[dnl
     AC_REQUIRE([AX_CONFIGURE_ARGS])dnl
     eval $SHELL $ac_configure_args || exit $?
     ...])

AC_DEFUN([AX_CONFIGURE_ARGS],[
   # [$]@ is unsable in 2.60+ but earlier autoconf had no ac_configure_args
   if test "${ac_configure_args+set}" != "set" ; then
      ac_configure_args=
      for ac_arg in ${1+"[$]@"}; do
         ac_configure_args="$ac_configure_args '$ac_arg'"
      done
   fi
])

Copyright © 2007 Guido U. Draheim <guidod@gmx.de>

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

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