longlong.h: Disable alpha umul_ppmm for old g++

Causes "unexpected AST of kind MULT_HIGHPART" error with bootstrap from gcc 4.8.
git-mirror · Jan 7, 2016 · 7f49b7c · 7f49b7c
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diff --git a/ChangeLog b/ChangeLog
@@ -1,3 +1,7 @@
+2016-01-07  Richard Henderson  <rth@redhat.com>
+
+	* longlong.h [__alpha] (umul_ppmm): Disable for c++.
+
 2016-01-07  Mike Frysinger  <vapier@gentoo.org>
 
 	* sysdeps/unix/sysv/linux/fxstat64.c (___fxstat64): Change

diff --git a/stdlib/longlong.h b/stdlib/longlong.h
@@ -139,13 +139,17 @@ extern const UQItype __clz_tab[256] attribute_hidden;
 #endif /* __aarch64__ */
 
 #if defined (__alpha) && W_TYPE_SIZE == 64
+/* There is a bug in g++ before version 5 that
+   errors on __builtin_alpha_umulh.  */
+#if !defined(__cplusplus) || __GNUC__ >= 5
 #define umul_ppmm(ph, pl, m0, m1) \
   do {									\
     UDItype __m0 = (m0), __m1 = (m1);					\
     (ph) = __builtin_alpha_umulh (__m0, __m1);				\
     (pl) = __m0 * __m1;							\
   } while (0)
 #define UMUL_TIME 46
+#endif /* !c++ */
 #ifndef LONGLONG_STANDALONE
 #define udiv_qrnnd(q, r, n1, n0, d) \
   do { UDItype __r;							\