问题形容

在执行 make 构建时可能会报错
Building C object storage/myisam/CMakeFiles/myisam.dir/mi_rfirst.c.oIn file included from /path/to/mysql-5.7.35/storage/perfschema/cursor_by_account.cc:28:In file included from /path/to/mysql-5.7.35/include/my_global.h:57:In file included from /Library/Developer/CommandLineTools/SDKs/MacOSX11.3.sdk/usr/include/c++/v1/math.h:309:In file included from /Library/Developer/CommandLineTools/SDKs/MacOSX11.3.sdk/usr/include/c++/v1/type_traits:417:In file included from /Library/Developer/CommandLineTools/SDKs/MacOSX11.3.sdk/usr/include/c++/v1/cstddef:37:/path/to/mysql-5.7.35/version:1:1: error: expected unqualified-idMYSQL_VERSION_MAJOR=5^/path/to/mysql-5.7.35/include/my_config.h:404:29: note: expanded from macro 'MYSQL_VERSION_MAJOR'#define MYSQL_VERSION_MAJOR 5                            ^

起因排查

通过 Homebrew 的 mysql@5.7.rb,找到了一个 PATCH。

在 MySQL 的 Commit 记录 Bug #31466846 RENAME THE VERSION FILE TO MYSQL_VERSION 找到了答案:

Bug #31466846 RENAME THE VERSION FILE TO MYSQL_VERSIONWith new versions of boost, the build is broken on windows.<version> is a header file which is part of C++11, but on win weinclude our own VERSION instead, and the build breaks.The solution is 'git mv VERSION MYSQL_VERSION', and adaptcmake code accordingly.Change-Id: I5211cf41fa83e879a25d4110dbb8933cd58da2f9 8.0 mysql-cluster-8.0.26  mysql-cluster-8.0.25 mysql-cluster-8.0.24 mysql-cluster-8.0.23 mysql-cluster-8.0.22 mysql-8.0.26 mysql-8.0.25 mysql-8.0.24 mysql-8.0.23 mysql-8.0.22Tor Didriksen committed on 10 Jun 2020 1 parent 6653b43 commit 51675ddb41661163c23e802a3e5eedb1344ce023

大略意思是:

versionC++11 的一个头文件,但 MySQL 以往都是用 VERSION 示意的版本号,在引入文件时又因 macOS 不辨别文件大小写,产生了抵触,导致编译时报错中断。

macOS Big Sur 11.5 中的 SDK 是 MacOSX11.3.sdk,的确在 include 下存在 version 这么个头文件:

/Library/Developer/CommandLineTools/SDKs/MacOSX11.3.sdk/usr/include/c++/v1/version

但在 MacOSX11.1.sdk 及更老版本中,却没有这个文件。

每个版本的 Mac SDK 状况,能够参考下这个我的项目:

https://github.com/phracker/M...

所以产生问题的条件是:

  • MacOSX11.1.sdk 及以下零碎中编译 MySQL 8.0.21 及更老版本(包含5.7.*)时,没问题
  • MacOSX11.3.sdk 及以上版本中编译 MySQL 8.0.22 及更新版本时,没问题
  • MacOSX11.3.sdk 及以上版本中编译 MySQL 8.0.21 及更老版本(包含5.7.*)时,有问题

SDK 版本与 XCodexcode-select 有关系。

能够通过 /Library/Developer/CommandLineTools/SDKs 目录来判断 SDK 版本。

解决方案

MySQL 8.0.22 及更新版本,官网曾经批改了,但老版本怎么办?就按官网的形式批改下即可。

在执行 cmake 前,先批改2个中央:

  • 文件 VERSION 重命名为 MYSQL_VERSION
  • 文件 cmake/mysql_version.cmake 中 2 处代码,VERSION 替换为 MYSQL_VERSION
diff --git a/cmake/mysql_version.cmake b/cmake/mysql_version.cmakeindex 43d731e..3031258 100644--- a/cmake/mysql_version.cmake+++ b/cmake/mysql_version.cmake@@ -31,7 +31,7 @@ SET(DOT_FRM_VERSION "6") # Generate "something" to trigger cmake rerun when VERSION changes CONFIGURE_FILE(-  ${CMAKE_SOURCE_DIR}/VERSION+  ${CMAKE_SOURCE_DIR}/MYSQL_VERSION   ${CMAKE_BINARY_DIR}/VERSION.dep )@@ -39,7 +39,7 @@ CONFIGURE_FILE( MACRO(MYSQL_GET_CONFIG_VALUE keyword var)  IF(NOT ${var})-   FILE (STRINGS ${CMAKE_SOURCE_DIR}/VERSION str REGEX "^[ ]*${keyword}=")+   FILE (STRINGS ${CMAKE_SOURCE_DIR}/MYSQL_VERSION str REGEX "^[ ]*${keyword}=")    IF(str)      STRING(REPLACE "${keyword}=" "" str ${str})      STRING(REGEX REPLACE  "[ ].*" ""  str "${str}")

写好的脚本间接用:

mv VERSION MYSQL_VERSIONsed -i '' 's|${CMAKE_SOURCE_DIR}/VERSION|${CMAKE_SOURCE_DIR}/MYSQL_VERSION|g' cmake/mysql_version.cmake

参考资料

  • Homebrew/homebrew-core/Formula/mysql@5.7.rb
  • mysql/mysql-server@Bug #31466846 RENAME THE VERSION FILE TO MYSQL_VERSION

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原文地址: https://shockerli.net/post/mysql-source-version-conflict-in-cpp-11/