C++、Mac OS X、Xcode 8：编译加速：将部署目标设置为 OS X 10.11答案

【问题标题】：C++, Mac OS X, Xcode 8 : Compile Boost : Set deployment target to OS X 10.11C++、Mac OS X、Xcode 8：编译加速：将部署目标设置为 OS X 10.11
【发布时间】：2016-10-31 17:29:18
【问题描述】：

我正在尝试在 Mac OS X 10.11.6 上使用 Boost CPP 库。我从官方 SourceForge 存储库下载了 1.62 版本的 Boost。提取它并按照此处的文档进行构建：http://www.boost.org/doc/libs/1_62_0/more/getting_started/unix-variants.html

基本上，我进入目录并运行“bootstrap.sh”和“b2”脚本。

然后我创建了一个简单的 C++ 程序：

#include <iostream>
#include <string>

#include <boost/algorithm/string.hpp>
#include <boost/regex.hpp>

int main() {
  std::string str1(" hello world! ");
  boost::to_upper(str1);

  std::cout << str1 << std::endl;

  std::string s = " Boost Libraries ";
  boost::regex expr{"\\s"};
  std::string fmt{"_"};
  std::cout << boost::regex_replace(s, expr, fmt) << '\n';

  return 0;
}

并尝试使用以下 CMake 文件构建它

cmake_minimum_required(VERSION 2.8.9)

set(CMAKE_CXX_FLAGS "-std=c++11 -stdlib=libc++")

project(app_project)

set(Boost_USE_STATIC_LIBS ON) 
set(Boost_USE_MULTITHREADED ON)  
set(Boost_USE_STATIC_RUNTIME ON) 

find_package(Boost 1.62.0 COMPONENTS regex) 

if(Boost_FOUND)
    include_directories(${Boost_INCLUDE_DIRS}) 
    add_executable(myapp main.cpp)
    target_link_libraries(myapp ${Boost_LIBRARIES})
endif()

当我制作程序时，我收到以下警告：

ld: warning: object file (/Users/pritam/opt/boost_1_62_0/stage/lib/libboost_regex.a(instances.o)) was built for newer OSX version (10.12) than being linked (10.11)
ld: warning: object file (/Users/pritam/opt/boost_1_62_0/stage/lib/libboost_regex.a(regex.o)) was built for newer OSX version (10.12) than being linked (10.11)
ld: warning: object file (/Users/pritam/opt/boost_1_62_0/stage/lib/libboost_regex.a(regex_traits_defaults.o)) was built for newer OSX version (10.12) than being linked (10.11)
ld: warning: object file (/Users/pritam/opt/boost_1_62_0/stage/lib/libboost_regex.a(regex_raw_buffer.o)) was built for newer OSX version (10.12) than being linked (10.11)
ld: warning: object file (/Users/pritam/opt/boost_1_62_0/stage/lib/libboost_regex.a(cpp_regex_traits.o)) was built for newer OSX version (10.12) than being linked (10.11)
ld: warning: object file (/Users/pritam/opt/boost_1_62_0/stage/lib/libboost_regex.a(static_mutex.o)) was built for newer OSX version (10.12) than being linked (10.11)

我在这台机器上安装了 XCode 8。似乎在构建 Boost 时，它将部署目标设置为 OS X 10.12。

所以问题是：

如何在构建 Boost 时将部署目标设置为 OS X 10.11？

【问题讨论】：

标签： c++ macos boost

【解决方案1】：

要定位低于您正在构建的当前 OSX 版本的最低 OSX 版本，您需要设置 -mmacosx-version-min 选项。因此，如果您使用toolset=darwin，您需要构建为：

b2 macosx-version-min=10.11 ...

因为该工具集对 OSX 最小版本有特殊处理。或者，如果您使用 toolset=clang，您需要构建为：

b2 cflags=-mmacosx-version-min=10.11 cxxflags=-mmacosx-version-min=10.11 mflags=-mmacosx-version-min=10.11 mmflags=-mmacosx-version-min=10.11 linkflags=-mmacosx-version-min=10.11 ...

【讨论】：