From 2a50187a923eb8950bc8b63f50eaea4704d6dc36 Mon Sep 17 00:00:00 2001
From: nobled <nobled@dreamwidth.org>
Date: Sun, 29 Aug 2010 20:03:37 -0400
Subject: Make configure work with clang

It was mistaking clang for gcc and deciding its version
was too low.
---
 configure.ac | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index 45188544fb0..cf2e200db3f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -48,9 +48,23 @@ solaris*)
     ;;
 esac
 
+dnl clang is mostly GCC-compatible, but its version is much lower,
+dnl so we have to check for it.
+AC_MSG_CHECKING([if compiling with clang])
+
+AC_COMPILE_IFELSE(
+[AC_LANG_PROGRAM([], [[
+#ifndef __clang__
+       not clang
+#endif
+]])],
+[CLANG=yes], [CLANG=no])
+
+AC_MSG_RESULT([$CLANG])
+
 dnl If we're using GCC, make sure that it is at least version 3.3.0.  Older
 dnl versions are explictly not supported.
-if test "x$GCC" = xyes; then
+if test "x$GCC" = xyes -a "x$CLANG" = xno; then
     AC_MSG_CHECKING([whether gcc version is sufficient])
     major=0
     minor=0
-- 
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