54 lines
1.9 KiB
Diff
54 lines
1.9 KiB
Diff
|
From 566844b93e6823a04ed65827ba3e03cb123b3a03 Mon Sep 17 00:00:00 2001
|
||
|
|
From: Khem Raj <raj.khem@gmail.com>
|
||
|
|
Date: Wed, 18 Jan 2023 00:32:36 -0800
|
||
|
|
Subject: [PATCH 106/125] Define alignof using _Alignof when using C11 or newer
|
||
|
|
|
||
|
|
WG14 N2350 made very clear that it is an UB having type definitions
|
||
|
|
within "offsetof" [1]. This patch enhances the implementation of macro
|
||
|
|
alignof_slot to use builtin "_Alignof" to avoid undefined behavior on
|
||
|
|
when using std=c11 or newer
|
||
|
|
|
||
|
|
clang 16+ has started to flag this [2]
|
||
|
|
|
||
|
|
Fixes build when using -std >= gnu11 and using clang16+
|
||
|
|
|
||
|
|
Older compilers gcc < 4.9 or clang < 8 has buggy _Alignof even though it
|
||
|
|
may support C11, exclude those compilers too
|
||
|
|
|
||
|
|
[1] https://www.open-std.org/jtc1/sc22/wg14/www/docs/n2350.htm
|
||
|
|
[2] https://reviews.llvm.org/D133574
|
||
|
|
|
||
|
|
Upstream-Status: Pending
|
||
|
|
Signed-off-by: Khem Raj <raj.khem@gmail.com>
|
||
|
|
Signed-off-by: Jes Sorensen <jes@trained-monkey.org>
|
||
|
|
---
|
||
|
|
sha1.c | 12 +++++++++++-
|
||
|
|
1 file changed, 11 insertions(+), 1 deletion(-)
|
||
|
|
|
||
|
|
diff --git a/sha1.c b/sha1.c
|
||
|
|
index 89b32f46..1e4ad5d9 100644
|
||
|
|
--- a/sha1.c
|
||
|
|
+++ b/sha1.c
|
||
|
|
@@ -229,7 +229,17 @@ sha1_process_bytes (const void *buffer, size_t len, struct sha1_ctx *ctx)
|
||
|
|
if (len >= 64)
|
||
|
|
{
|
||
|
|
#if !_STRING_ARCH_unaligned
|
||
|
|
-# define alignof(type) offsetof (struct { char c; type x; }, x)
|
||
|
|
+/* GCC releases before GCC 4.9 had a bug in _Alignof. See GCC bug 52023
|
||
|
|
+ <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52023>.
|
||
|
|
+ clang versions < 8.0.0 have the same bug. */
|
||
|
|
+# if (!defined __STDC_VERSION__ || __STDC_VERSION__ < 201112 \
|
||
|
|
+ || (defined __GNUC__ && __GNUC__ < 4 + (__GNUC_MINOR__ < 9) \
|
||
|
|
+ && !defined __clang__) \
|
||
|
|
+ || (defined __clang__ && __clang_major__ < 8))
|
||
|
|
+# define alignof(type) offsetof (struct { char c; type x; }, x)
|
||
|
|
+# else
|
||
|
|
+# define alignof(type) _Alignof(type)
|
||
|
|
+# endif
|
||
|
|
# define UNALIGNED_P(p) (((size_t) p) % alignof (sha1_uint32) != 0)
|
||
|
|
if (UNALIGNED_P (buffer))
|
||
|
|
while (len > 64)
|
||
|
|
--
|
||
|
|
2.38.1
|
||
|
|
|