* configure.in: reject llvm-gcc.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@33607 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,7 @@
+Tue Nov  1 22:08:27 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* configure.in: reject llvm-gcc.
+
 Tue Nov  1 21:39:00 2011  NARUSE, Yui  <naruse@ruby-lang.org>
 
 	* io.c (rb_cloexec_pipe): remove workaround of r33587.

configure.in

@@ -289,6 +289,11 @@ AC_PROG_CXX
 AC_PROG_GCC_TRADITIONAL
 AC_SUBST(GCC)
 if test "$GCC" = yes; then
+    AC_TRY_LINK([
+      @%:@if defined __llvm__ && !defined __clang__
+      @%:@error llvm-gcc has ended
+      @%:@endif
+    ], [], [], [AC_MSG_ERROR(llvm-gcc has ended)])
     linker_flag=-Wl,
     : ${optflags=-O3}
     AS_CASE(["$target_os"], [linux*|darwin*], [: ${debugflags=-ggdb}])