1# =========================================================================== 2# https://www.gnu.org/software/autoconf-archive/ax_require_defined.html 3# =========================================================================== 4# 5# SYNOPSIS 6# 7# AX_REQUIRE_DEFINED(MACRO) 8# 9# DESCRIPTION 10# 11# AX_REQUIRE_DEFINED is a simple helper for making sure other macros have 12# been defined and thus are available for use. This avoids random issues 13# where a macro isn't expanded. Instead the configure script emits a 14# non-fatal: 15# 16# ./configure: line 1673: AX_CFLAGS_WARN_ALL: command not found 17# 18# It's like AC_REQUIRE except it doesn't expand the required macro. 19# 20# Here's an example: 21# 22# AX_REQUIRE_DEFINED([AX_CHECK_LINK_FLAG]) 23# 24# LICENSE 25# 26# Copyright (c) 2014 Mike Frysinger <vapier@gentoo.org> 27# 28# Copying and distribution of this file, with or without modification, are 29# permitted in any medium without royalty provided the copyright notice 30# and this notice are preserved. This file is offered as-is, without any 31# warranty. 32 33#serial 2 34 35AC_DEFUN([AX_REQUIRE_DEFINED], [dnl 36 m4_ifndef([$1], [m4_fatal([macro ]$1[ is not defined; is a m4 file missing?])]) 37])dnl AX_REQUIRE_DEFINED 38