From: Jeff King <peff@peff.net>
Date: Mon, 10 Jul 2017 13:24:50 +0000 (-0400)
Subject: Makefile: disable unaligned loads with UBSan
X-Git-Tag: v2.14.0-rc0~1^2
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=566cf0b3bd6458a74e8a3df8c01d27f35e7814f2;p=git

Makefile: disable unaligned loads with UBSan

The undefined behavior sanitizer complains about unaligned
loads, even if they're OK for a particular platform in
practice. It's possible that they _are_ a problem, of
course, but since it's a known tradeoff the UBSan errors are
just noise.

Let's quiet it automatically by building with
NO_UNALIGNED_LOADS when SANITIZE=undefined is in use.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---

diff --git a/Makefile b/Makefile
index d03880e690..852dedc25c 100644
--- a/Makefile
+++ b/Makefile
@@ -994,6 +994,9 @@ endif
 ifdef SANITIZE
 BASIC_CFLAGS += -fsanitize=$(SANITIZE) -fno-sanitize-recover=$(SANITIZE)
 BASIC_CFLAGS += -fno-omit-frame-pointer
+ifeq ($(SANITIZE),undefined)
+BASIC_CFLAGS += -DNO_UNALIGNED_LOADS
+endif
 endif
 
 ifndef sysconfdir