Mercurial > hg > nginx
view src/core/ngx_crc.h @ 9315:d286426eab1a
Support for Clang with "-fgnuc-version=0".
Previously, the code assumed that Clang pretends to be GCC and defines
the __GNUC__ macro, which might not be the case if the "-fgnuc-version=0"
flag is used. Fix is to explicitly check for __clang__ as well.
In practice, with this change ngx_cpuinfo() is now available on Linux
with "-fgnuc-version=0".
author | Maxim Dounin <mdounin@mdounin.ru> |
---|---|
date | Wed, 07 Aug 2024 03:58:30 +0300 |
parents | d620f497c50f |
children |
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/* * Copyright (C) Igor Sysoev * Copyright (C) Nginx, Inc. */ #ifndef _NGX_CRC_H_INCLUDED_ #define _NGX_CRC_H_INCLUDED_ #include <ngx_config.h> #include <ngx_core.h> /* 32-bit crc16 */ static ngx_inline uint32_t ngx_crc(u_char *data, size_t len) { uint32_t sum; for (sum = 0; len; len--) { /* * gcc 2.95.2 x86 and icc 7.1.006 compile * that operator into the single "rol" opcode, * msvc 6.0sp2 compiles it into four opcodes. */ sum = sum >> 1 | sum << 31; sum += *data++; } return sum; } #endif /* _NGX_CRC_H_INCLUDED_ */