configure.in: fix for old Apple compilers

* configure.in (__builtin_setjmp): disable with gcc/clang earlier
  than 4.3 on Mac OS X.  [ruby-core:65174] [Bug #10272]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48184 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Wed Oct 29 11:48:23 2014  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* configure.in (__builtin_setjmp): disable with gcc/clang earlier
+	  than 4.3 on Mac OS X.  [ruby-core:65174] [Bug #10272]
+
 Wed Oct 29 11:43:43 2014  Marc-Andre Lafortune  <ruby-core@marc-andre.ca>
 
 	* lib/matrix.rb: Generalize Vector#cross_product to arbitrary

configure.in

@@ -494,7 +494,9 @@ if test "$GCC" = yes; then
     linker_flag=-Wl,
     : ${optflags=-O3}
     gcc_major=`echo =__GNUC__ | $CC -E -xc - | sed '/^=/!d;s///'`
+    gcc_minor=`echo =__GNUC_MINOR__ | $CC -E -xc - | sed '/^=/!d;s///'`
     test -n "$gcc_major" || gcc_major=0
+    test -n "$gcc_minor" || gcc_minor=0
     # RUBY_APPEND_OPTIONS(XCFLAGS, ["-include ruby/config.h" "-include ruby/missing.h"])
 else
     linker_flag=
@@ -1001,6 +1003,9 @@ AS_CASE(["$target_os"],
 		ac_cv_lib_crypt_crypt=no
 		ac_cv_func_fdatasync=no # Mac OS X wrongly reports it has fdatasync()
 		ac_cv_func_vfork=no
+		if test $gcc_major -lt 4 -o \( $gcc_major -eq 4 -a $gcc_minor -lt 3 \); then
+		    ac_cv_func___builtin_setjmp=no
+		fi
                 AC_CACHE_CHECK(for broken crypt with 8bit chars, rb_cv_broken_crypt,
                     [AC_TRY_RUN([
 #include <stdio.h>