From 90e8a9b4bd583d7b65edf97343dd7d8317f091a6 Mon Sep 17 00:00:00 2001
From: nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Mon, 1 Apr 2013 05:22:57 +0000
Subject: configure.in: clang check

* configure.in: check clang version by predefined macro values.
  [Bug #8192]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@40030 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 ChangeLog    | 5 +++++
 configure.in | 9 ++++++---
 2 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index b2207a41ae..4cd868504e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Mon Apr  1 14:22:52 2013  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* configure.in: check clang version by predefined macro values.
+	  [Bug #8192]
+
 Mon Apr  1 12:05:15 2013  Tanaka Akira  <akr@fsij.org>
 
 	* numeric.c (check_uint): Take the 1st argument as unsigned long,
diff --git a/configure.in b/configure.in
index 3e436c4b92..3a9a14aa42 100644
--- a/configure.in
+++ b/configure.in
@@ -396,9 +396,12 @@ AS_CASE(["$host_os:$build_os"],
     # clang version 1.0 (http://llvm.org/svn/llvm-project/cfe/tags/Apple/clang-23 exported)
     # Apple clang version 2.0 (tags/Apple/clang-137) (based on LLVM 2.9svn)
     # Apple clang version 2.1 (tags/Apple/clang-163.7.1) (based on LLVM 3.0svn)
-    if test "$CC" = "clang" && $CC --version | grep 'clang version @<:@12 @:>@\.' ; then
-        AC_MSG_ERROR([clang version 3.0 or later is required])
-    fi
+    AC_COMPILE_IFELSE([AC_LANG_PROGRAM([
+	@%:@if defined __APPLE_CC__ && defined __clang_major__ && __clang_major__ < 3
+	@%:@error premature clang
+	@%:@endif])],
+	[],
+	[AC_MSG_ERROR([clang version 3.0 or later is required])])
 ])
 if test x"${build}" != x"${host}"; then
   AC_CHECK_TOOL(CC, gcc)
-- 
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