为4个平台编译Boost

公司的项目至今仍在使用Boost 1.56.0版本，最近发现Boost.uuid在Windows上居然会一直尝试去访问/dev/urandom，进而转移到系统盘根目录urandom文件，然后客户认为这会有安全隐患，需要修正。我随手看了一下Boost.uuid在1.56.0和1.64.0上的源代码，貌似确实1.56.0版并没有分系统实现，在1.64.0上为Windows系统使用平台特有的实现。于是我就建议升级Boost，然后发现这个third party的owner居然是我们组，同事开玩笑地问我能不能去为几个平台编译一下Boost，我当场就拒绝了，但回到家我还是决定折腾一下。

Windows平台使用msvc 2015的话特别简单：

call "%VS140COMNTOOLS%..\..\VC\vcvarsall.bat" x86

set cores=%NUMBER_OF_PROCESSORS%
echo Building boost with %cores% cores

call bootstrap.bat

rem Most libraries can be static libs
b2 -j%cores% toolset=msvc-14.0 address-model=64 architecture=x86 link=static threading=multi runtime-link=shared --build-type=minimal stage --stagedir=stage/msvc2015-x64
b2 -j%cores% toolset=msvc-14.0 address-model=32 architecture=x86 link=static threading=multi runtime-link=shared --build-type=minimal stage --stagedir=stage/msvc2015-x86

pause

macOS和iOS平台使用了同一组脚本，从网上找的，我再自己稍做修改，macOS上只要x86_64架构的即可。

iOS上需要armv7，arm64，i386，x86_64四种架构的。

Android平台的搞了很久，昨天晚上折腾到12点多，今天又折腾了一个白天，终于搞定。网上有许多各种方案，在Linux，Windows，macOS上都有，我在Windows 10上折腾了很多次都不行，最后在macOS上成功了。首先，仍然是先构建bjam：

./bootstrap.sh

然后修改Boost根目录下的project-config.jam文件，用以下内容覆盖文件内容：

import option ;

using gcc : x86 : i686-linux-android-g++ ;
using gcc : x86_64 : x86_64-linux-android-g++ ;
using gcc : mipsel : mipsel-linux-android-g++ ;
using gcc : mips64el : mips64el-linux-android-g++ ;
using gcc : aarch64 : aarch64-linux-android-g++ ;
using gcc : arm : arm-linux-androideabi-g++ ;

option.set keep-going : false ;

接着把Android NDK路径设置到环境变量中：

export androidNDKRoot=$HOME/android-ndk-r14b

最后运行bjam进行编译：

#!/bin/bash
env PATH=$androidNDKRoot/toolchains/x86-linux-android-4.9/prebuilt/darwin-x86_64/bin/:$PATH ./bjam -j2 --reconfigure link=static threading=multi threadapi=pthread target-os=android stage --stagedir=android/x86 toolset=gcc-x86 define=BOOST_MATH_DISABLE_FLOAT128 include=$androidNDKRoot/sources/cxx-stl/gnu-libstdc++/4.9/include include=$androidNDKRoot/sources/cxx-stl/gnu-libstdc++/4.9/libs/x86/include/ include=$androidNDKRoot/platforms/android-21/arch-x86/usr/include
env PATH=$androidNDKRoot/toolchains/x86_64-linux-android-4.9/prebuilt/darwin-x86_64/bin/:$PATH ./bjam -j2 --reconfigure link=static threading=multi threadapi=pthread target-os=android stage --stagedir=android/x86_64 toolset=gcc-x86_64 define=BOOST_MATH_DISABLE_FLOAT128 include=$androidNDKRoot/sources/cxx-stl/gnu-libstdc++/4.9/include include=$androidNDKRoot/sources/cxx-stl/gnu-libstdc++/4.9/libs/x86_64/include/ include=$androidNDKRoot/platforms/android-21/arch-x86_64/usr/include
env PATH=$androidNDKRoot/toolchains/arm-linux-android-4.9/prebuilt/darwin-x86_64/bin/:$PATH ./bjam -j2 --reconfigure link=static threading=multi threadapi=pthread target-os=android stage --stagedir=android/arm toolset=gcc-arm define=BOOST_MATH_DISABLE_FLOAT128 include=$androidNDKRoot/sources/cxx-stl/gnu-libstdc++/4.9/include include=$androidNDKRoot/sources/cxx-stl/gnu-libstdc++/4.9/libs/armeabi/include/ include=$androidNDKRoot/platforms/android-21/arch-arm/usr/include
env PATH=$androidNDKRoot/toolchains/aarch64-linux-android-4.9/prebuilt/darwin-x86_64/bin/:$PATH ./bjam -j2 --reconfigure link=static threading=multi threadapi=pthread target-os=android stage --stagedir=android/aarch64 toolset=gcc-aarch64 define=BOOST_MATH_DISABLE_FLOAT128 include=$androidNDKRoot/sources/cxx-stl/gnu-libstdc++/4.9/include include=$androidNDKRoot/sources/cxx-stl/gnu-libstdc++/4.9/libs/arm64-v8a/include/ include=$androidNDKRoot/platforms/android-21/arch-arm64/usr/include
env PATH=$androidNDKRoot/toolchains/mips64el-linux-android-4.9/prebuilt/darwin-x86_64/bin/:$PATH ./bjam -j2 --reconfigure link=static threading=multi threadapi=pthread target-os=android stage --stagedir=android/mips64el toolset=gcc-mips64el define=BOOST_MATH_DISABLE_FLOAT128 include=$androidNDKRoot/sources/cxx-stl/gnu-libstdc++/4.9/include include=$androidNDKRoot/sources/cxx-stl/gnu-libstdc++/4.9/libs/mips64/include/ include=$androidNDKRoot/platforms/android-21/arch-mips64/usr/include
env PATH=$androidNDKRoot/toolchains/mipsel-linux-android-4.9/prebuilt/darwin-x86_64/bin/:$PATH ./bjam -j2 --reconfigure link=static threading=multi threadapi=pthread target-os=android stage --stagedir=android/mipsel toolset=gcc-mipsel define=BOOST_MATH_DISABLE_FLOAT128 include=$androidNDKRoot/sources/cxx-stl/gnu-libstdc++/4.9/include include=$androidNDKRoot/sources/cxx-stl/gnu-libstdc++/4.9/libs/mips/include/ include=$androidNDKRoot/platforms/android-21/arch-mips/usr/include

这样可以编译出armeabi等共6种目前官方NDK支持的架构的静态库。