From 2077aa08599bc0087271d10d463f0518978d755f Mon Sep 17 00:00:00 2001 From: Yang Tse Date: Wed, 7 Mar 2007 01:13:03 +0000 Subject: [PATCH] Autoconf redefines the M4 builtin macro 'm4_undefine' in such a way that it fails if the macro that is being undefined is not already defined. To make this work under all cases and be sure that at a certain point some specific macro isn't defined we must use the following style in configure: m4_ifdef([macro], [m4_undefine([macro])]) --- configure.ac | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/configure.ac b/configure.ac index 2d09dbac..09eb4eae 100644 --- a/configure.ac +++ b/configure.ac @@ -64,11 +64,15 @@ AC_HELP_STRING([--disable-debug],[Disable debug options]), ) dnl skip libtool C++ and Fortran compiler checks +m4_ifdef([AC_PROG_CXX], [m4_undefine([AC_PROG_CXX])]) m4_defun([AC_PROG_CXX],[]) +m4_ifdef([AC_PROG_F77], [m4_undefine([AC_PROG_F77])]) m4_defun([AC_PROG_F77],[]) dnl skip libtool C++ and Fortran linker checks +m4_ifdef([AC_LIBTOOL_CXX], [m4_undefine([AC_LIBTOOL_CXX])]) m4_defun([AC_LIBTOOL_CXX],[]) +m4_ifdef([AC_LIBTOOL_F77], [m4_undefine([AC_LIBTOOL_F77])]) m4_defun([AC_LIBTOOL_F77],[]) dnl libtool setup