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-rw-r--r--include/compiler.h6
1 files changed, 5 insertions, 1 deletions
diff --git a/include/compiler.h b/include/compiler.h
index aab93566..7a80e2e4 100644
--- a/include/compiler.h
+++ b/include/compiler.h
@@ -353,7 +353,11 @@ size_t strnlen(const char *s, size_t maxlen);
/* Determine probabilistically if something is a compile-time constant */
#ifdef HAVE___BUILTIN_CONSTANT_P
-# define is_constant(x) __builtin_constant_p((x))
+# if defined(__GNUC__) && (__GNUC__ >= 5)
+# define is_constant(x) __builtin_constant_p((x))
+# else
+# define is_constant(x) false
+# endif
#else
# define is_constant(x) false
#endif