Commit d31feb8f authored Mar 07, 2007 by Yang Tse

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])])

parent 4c3568bf

ares/configure.ac

+4 −0

Original line number	Diff line number	Diff line
		@@ -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

configure.ac

+4 −0

Original line number	Diff line number	Diff line
		@@ -116,11 +116,15 @@ dnl support building of Windows DLLs
		AC_LIBTOOL_WIN32_DLL

		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