From a1b880642244b9f732d327e1d93162652838bb06 Mon Sep 17 00:00:00 2001
From: Max Kellermann <max@duempel.org>
Date: Thu, 1 Sep 2011 09:18:16 +0200
Subject: configure.ac: fail if libid3tag was enabled explicitly, but not found

Add M4 function MPD_AUTO_PKG_LIB for pkg-config with AC_CHECK_LIB
fallback.
---
 m4/mpd_auto.m4 | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

(limited to 'm4')

diff --git a/m4/mpd_auto.m4 b/m4/mpd_auto.m4
index 3f233938f..23713d5b7 100644
--- a/m4/mpd_auto.m4
+++ b/m4/mpd_auto.m4
@@ -63,3 +63,18 @@ AC_DEFUN([MPD_AUTO_PKG], [
 
 	MPD_AUTO_RESULT([$1], [$4], [$5])
 ])
+
+dnl Check with pkg-config first, fall back to AC_CHECK_LIB.
+dnl
+dnl Parameters: varname1, varname2, pkgname, libname, symname, libs, cflags, description, errmsg
+AC_DEFUN([MPD_AUTO_PKG_LIB], [
+	if eval "test x`echo '$'enable_$1` != xno"; then
+		PKG_CHECK_MODULES([$2], [$3],
+			[eval "found_$1=yes"],
+			AC_CHECK_LIB($4, $5,
+				[eval "found_$1=yes $2_LIBS='$6' $2_CFLAGS='$7'"],
+				[eval "found_$1=no"]))
+	fi
+
+	MPD_AUTO_RESULT([$1], [$8], [$9])
+])
-- 
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