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- # AM_CONDITIONAL -*- Autoconf -*-
- # Copyright (C) 1997-2017 Free Software Foundation, Inc.
- #
- # This file is free software; the Free Software Foundation
- # gives unlimited permission to copy and/or distribute it,
- # with or without modifications, as long as this notice is preserved.
- # AM_CONDITIONAL(NAME, SHELL-CONDITION)
- # -------------------------------------
- # Define a conditional.
- AC_DEFUN([AM_CONDITIONAL],
- [AC_PREREQ([2.52])dnl
- m4_if([$1], [TRUE], [AC_FATAL([$0: invalid condition: $1])],
- [$1], [FALSE], [AC_FATAL([$0: invalid condition: $1])])dnl
- AC_SUBST([$1_TRUE])dnl
- AC_SUBST([$1_FALSE])dnl
- _AM_SUBST_NOTMAKE([$1_TRUE])dnl
- _AM_SUBST_NOTMAKE([$1_FALSE])dnl
- m4_define([_AM_COND_VALUE_$1], [$2])dnl
- if $2; then
- $1_TRUE=
- $1_FALSE='#'
- else
- $1_TRUE='#'
- $1_FALSE=
- fi
- AC_CONFIG_COMMANDS_PRE(
- [if test -z "${$1_TRUE}" && test -z "${$1_FALSE}"; then
- AC_MSG_ERROR([[conditional "$1" was never defined.
- Usually this means the macro was only invoked conditionally.]])
- fi])])
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