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bug#33544: gzip 1.9 alignment compile failure on cast
From: |
Adler, Mark |
Subject: |
bug#33544: gzip 1.9 alignment compile failure on cast |
Date: |
Wed, 28 Nov 2018 19:22:56 +0000 |
Compiling gzip 1.9 on macOS 10.13.6 using Xcode 10.1 with clang (Apple LLVM
version 10.0.0 (clang-1000.11.45.5)), I get this error after ./configure and
make:
memrchr.c:71:18: error: cast from 'const unsigned char *' to 'const longword *'
(aka 'const unsigned long *') increases required alignment from 1 to 8
[-Werror,-Wcast-align]
longword_ptr = (const longword *) char_ptr;
I resolved it with this patch:
@@ -68,7 +68,7 @@ __memrchr (void const *s, int c_in, size_t n)
if (*--char_ptr == c)
return (void *) char_ptr;
- longword_ptr = (const longword *) char_ptr;
+ longword_ptr = (const void *) char_ptr;
/* All these elucidatory comments refer to 4-byte longwords,
but the theory applies equally well to any size longwords. */
Mark
- bug#33544: gzip 1.9 alignment compile failure on cast,
Adler, Mark <=