From a9e48470be8a52175149bf79627d79f51858dec9 Mon Sep 17 00:00:00 2001
From: Karel Zak
Date: Thu, 31 May 2012 10:02:52 +0200
Subject: build-sys: add UL_CONFLICTS_BUILD m4 macro

Signed-off-by: Karel Zak <kzak@redhat.com>
---
 m4/ul.m4 | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

(limited to 'm4')

diff --git a/m4/ul.m4 b/m4/ul.m4
index e7d35feea..2109aaa9b 100644
--- a/m4/ul.m4
+++ b/m4/ul.m4
@@ -182,6 +182,36 @@ AC_DEFUN([UL_REQUIRES_HAVE], [
   fi
 ])
 
+
+dnl
+dnl UL_CONFLICTS_BUILD(NAME, ANOTHER, ANOTHERDESC [VARSUFFIX=$1])
+dnl
+dnl - ends with error if $enable_<name> and $build_<another>
+dnl   are both set to 'yes'
+dnl - sets $build_<name> to 'no' if $build_<another> is 'yes' and
+dnl   $enable_<name> is 'check' or 'no'
+dnl
+dnl The <havedesc> is description used for warning/error
+dnl message (e.g. "function").
+dnl
+dnl The default <name> for $build_ and $enable_ could be overwrited by option $3.
+dnl
+AC_DEFUN([UL_CONFLICTS_BUILD], [
+  m4_define([suffix], m4_default([$4],$1))
+
+  if test "x$[build_]suffix" != xno; then
+    case $[enable_]suffix:$[build_]$2 in #(
+    no:*)
+      [build_]suffix=no ;;
+    check:yes)
+      [build_]suffix=no ;;
+    yes:yes)
+      AC_MSG_ERROR([$1 selected, but it conflicts with $3]);;
+    esac
+  fi
+])
+
+
 dnl UL_REQUIRES_BUILD(NAME, BUILDNAME, [VARSUFFIX=$1])
 dnl
 dnl Modifies $build_<name> variable according to $enable_<name> and $have_funcname.
-- 
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