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-rw-r--r--include/longlong.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/longlong.h b/include/longlong.h
index 4f2c4f5..a0b2ce1 100644
--- a/include/longlong.h
+++ b/include/longlong.h
@@ -139,6 +139,9 @@ 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); \
@@ -146,6 +149,7 @@ extern const UQItype __clz_tab[256] attribute_hidden;
(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; \