+CLANG_CPLUSPLUS=no
+
+if test "$GCC" = yes ; then
+ echo "$as_me:12292: checking if this is really Clang C++ compiler" >&5
+echo $ECHO_N "checking if this is really Clang C++ compiler... $ECHO_C" >&6
+ cf_save_CFLAGS="$CXXFLAGS"
+ CXXFLAGS="$CXXFLAGS -Qunused-arguments"
+ cat >conftest.$ac_ext <<_ACEOF
+#line 12297 "configure"
+#include "confdefs.h"
+
+int
+main ()
+{
+
+#ifdef __clang__
+#else
+make an error
+#endif
+
+ ;
+ return 0;
+}
+_ACEOF
+rm -f conftest.$ac_objext
+if { (eval echo "$as_me:12314: \"$ac_compile\"") >&5
+ (eval $ac_compile) 2>&5
+ ac_status=$?
+ echo "$as_me:12317: \$? = $ac_status" >&5
+ (exit $ac_status); } &&
+ { ac_try='test -s conftest.$ac_objext'
+ { (eval echo "$as_me:12320: \"$ac_try\"") >&5
+ (eval $ac_try) 2>&5
+ ac_status=$?
+ echo "$as_me:12323: \$? = $ac_status" >&5
+ (exit $ac_status); }; }; then
+ CLANG_CPLUSPLUS=yes
+cf_save_CFLAGS="$cf_save_CFLAGS -Qunused-arguments"
+
+else
+ echo "$as_me: failed program was:" >&5
+cat conftest.$ac_ext >&5
+fi
+rm -f conftest.$ac_objext conftest.$ac_ext
+ CXXFLAGS="$cf_save_CFLAGS"
+ echo "$as_me:12334: result: $CLANG_CPLUSPLUS" >&5
+echo "${ECHO_T}$CLANG_CPLUSPLUS" >&6
+fi
+