From a0df2e5a7efe90e932af66e70ba6c863a5826833 Mon Sep 17 00:00:00 2001 From: Jeff King Date: Tue, 29 Dec 2015 01:36:00 -0500 Subject: bswap: add NO_UNALIGNED_LOADS define The byte-swapping code automatically decides, based on the platform, whether it is sensible to cast and do a potentially unaligned ntohl(), or to pick individual bytes out of an array. It can be handy to override this decision, though, when turning on compiler flags that will complain about unaligned loads (such as -fsanitize=undefined). This patch adds a macro check to make this possible. There's no nice Makefile knob here; this is for prodding at Git's internals, and anybody using it can set "-DNO_UNALIGNED_LOADS" in the same place they are setting up "-fsanitize". Signed-off-by: Jeff King Signed-off-by: Junio C Hamano --- compat/bswap.h | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) (limited to 'compat') diff --git a/compat/bswap.h b/compat/bswap.h index 7fed637ed0..d47c003544 100644 --- a/compat/bswap.h +++ b/compat/bswap.h @@ -149,11 +149,12 @@ static inline uint64_t git_bswap64(uint64_t x) * and is faster on architectures with memory alignment issues. */ -#if defined(__i386__) || defined(__x86_64__) || \ +#if !defined(NO_UNALIGNED_LOADS) && ( \ + defined(__i386__) || defined(__x86_64__) || \ defined(_M_IX86) || defined(_M_X64) || \ defined(__ppc__) || defined(__ppc64__) || \ defined(__powerpc__) || defined(__powerpc64__) || \ - defined(__s390__) || defined(__s390x__) + defined(__s390__) || defined(__s390x__)) #define get_be16(p) ntohs(*(unsigned short *)(p)) #define get_be32(p) ntohl(*(unsigned int *)(p)) -- cgit v1.2.3