From: Conrad Meyer <cem@FreeBSD.org>
Date: Thu, 8 Aug 2019 21:16:36 +0000 (-0700)
Subject: Fix the build on GCC 4.x after 812e8f2a1
X-Git-Tag: v1.4.4~2^2
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=refs%2Fpull%2F1713%2Fhead;p=thirdparty%2Fzstd.git

Fix the build on GCC 4.x after 812e8f2a1

The ancient GCC 4.x doesn't understand the "optimize" attribute until 4.4.
Fix the build on platforms with GCC 4.x < 4.4 by limiting the DONT_VECTORIZE
definition to GCC 5 and greater.

Noticed and patch proposed by Warner Losh <imp@FreeBSD.org>.
---

diff --git a/lib/common/compiler.h b/lib/common/compiler.h
index 87bf51ae8..d18179582 100644
--- a/lib/common/compiler.h
+++ b/lib/common/compiler.h
@@ -128,7 +128,7 @@
 }
 
 /* vectorization */
-#if !defined(__clang__) && defined(__GNUC__)
+#if !defined(__clang__) && defined(__GNUC__) && __GNUC__ >= 5
 #  define DONT_VECTORIZE __attribute__((optimize("no-tree-vectorize")))
 #else
 #  define DONT_VECTORIZE