如何通过在CentOS 7上创建libcxx和libcxxabi [英] How to Build libcxx and libcxxabi by clang on CentOS 7
问题描述
我想在CentOS 7上使用clang / clang ++的C ++ 11或C ++ 14.如何构建这个构建环境？
本文教会如何在CentOS 7上构建C ++ 11构建环境：RHEL的EPEL repo提供Clang软件包，但没有C ++库软件包。所以，这些部分是有点麻烦由手建造。 Clang的定制C ++库是libc ++（libcxx）[1]。然后，libcxx还需要一个ABI库libc ++ abi（libcxxabi）[2]。不幸的是，这两个库有一个循环依赖的问题。为了打破循环依赖性问题，可以构建libc ++而不链接libc ++ abi。然后，使用这个libc ++，我们可以构建libc ++ abi连接libc ++。最后，使用libc ++ abi，我们可以构建一个新的libc ++链接libc ++ abi。
clang，libc ++和libc ++ abi环境构建步骤在下面给出：
-
添加RHEL的EPEL仓库。
打开以下链接，并找到如何使用这些额外的软件包？部分。
https://fedoraproject.org/wiki/EPEL
查找您的CentOS版本的epel包。例如：sudo rpm -i https://dl.fedoraproject.org/pub/epel/epel-release-latest -7.noarch.rpm
-
安装Subversion获取最新的libcxx和libcxxabi。 p>
sudo yum install svn
-
安装Clang和llvm-devel（使用llvm-config）。
sudo yum install clang llvm -devel
-
安装cmake。
cd / usr / local
wget https://cmake.org/files/v3.5/cmake-3.5.2-Linux-i386.sh
sudo chmod 755 cmake-3.5.2-Linux-i386.sh
sudo ./cmake-3.5.2-Linux-i386.sh
＃检查cmake是否在/ usr / local / bin中。
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第一轮建立libcxx而不使用libcxxabi。
＃获取libcxx。
svn co http://llvm.org/svn/llvm-project/libcxx/trunk libcxx
cd libcxx
＃不建议在源根目录中构建libcxx。
＃所以，我们做一个tmp目录。
mkdir tmp
cd tmp
＃指定要释放的CMAKE_BUILD_TYPE将生成性能优化的代码。
＃CMAKE_INSTALL_PREFIX将安装路径从默认的/ usr / local更改为/ usr。
cmake -DCMAKE_BUILD_TYPE = Release -DCMAKE_INSTALL_PREFIX = / usr -DCMAKE_C_COMPILER = clang -DCMAKE_CXX_COMPILER = clang ++ ..
sudo make install
cd ..
rm tmp -rf
cd ..
-
使用libc ++构建libcxxabi。
＃获取libcxxabi。
svn co http://llvm.org/svn/llvm-project/libcxxabi/trunk libcxxabi
cd libcxxabi
mkdir tmp
cd tmp
cmake -DCMAKE_BUILD_TYPE =发布-DCMAKE_INSTALL_PREFIX = / usr -DCMAKE_C_COMPILER = clang -DCMAKE_CXX_COMPILER = clang ++ -DLIBCXXABI_LIBCXX_INCLUDES = .. / .. / libcxx / include ..
sudo make install
cd ../ ..
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第二轮使用libcxxabi构建libcxx。
CD libcxx
的mkdir TMP
CD TMP
＃这一次，我们要编译libcxx与libcxxabi，所以我们必须指定LIBCXX_CXX_ABI = libcxxabi和路径到libcxxabi标头，LIBCXX_LIBCXXABI_INCLUDE_PATHS。
cmake的-DCMAKE_BUILD_TYPE =发行-DCMAKE_INSTALL_PREFIX =的/ usr -DCMAKE_C_COMPILER =铛-DCMAKE_CXX_COMPILER =铛++ -DLIBCXX_CXX_ABI = libcxxabi -DLIBCXX_CXX_ABI_INCLUDE_PATHS = .. / .. / libcxxabi /包括..
须藤使安装
-
写C ++测试程序。
// t.cpp
#include< iostream>
using namespace std;
int main（）{
cout<< 你好，世界！ << endl;
}
-
测试C ++用铿锵++。
$ B $编译b
＃-std指定C ++标准。 -stdlib指定要与clang / clang ++一起使用的C ++库。 -lc ++ ABI是必要的，因为新的LD（链接器和加载）在CentOS 7不允许间接库链接。
++铿锵-std = C ++ 11 -stdlib = ++的libc -lc ++ ABI t.cpp
./a.out
参考：结果
[1]的 http://libcxx.llvm.org/ 结果
[2]的 http://libcxxabi.llvm.org/
I want to use C++11 or C++14 with clang/clang++ on CentOS 7. How do I build this building environment?
This article teaches how to build C++11 building environment on CentOS 7: RHEL's EPEL repo provides Clang packages, but no C++ library packages. So, these parts are a bit troublesome to be built by hand. The customized C++ libraries for Clang is libc++ (libcxx) [1]. Then, libcxx also needs an ABI library, libc++abi (libcxxabi) [2]. Unfortunately, these two libraries have a circular dependency problem. For breaking the circular dependency problem, libc++ can be built without linking libc++abi. Then, with this libc++, we can build libc++abi linking libc++. Finally, with the libc++abi, we can build a new libc++ linking libc++abi.
The clang, libc++, and libc++abi environment building steps are given in the following：
Add RHEL's EPEL repo. Open the following link and find the section "How can I use these extra packages?" https://fedoraproject.org/wiki/EPEL
Find the epel package for your CentOS version. E.g.,:sudo rpm -i https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpmInstall Subversion for getting the latest libcxx and libcxxabi.
sudo yum install svnInstall Clang and llvm-devel (with llvm-config).
sudo yum install clang llvm-develInstall cmake.
cd /usr/local wget https://cmake.org/files/v3.5/cmake-3.5.2-Linux-i386.sh sudo chmod 755 cmake-3.5.2-Linux-i386.sh sudo ./cmake-3.5.2-Linux-i386.sh # Check cmake is in /usr/local/bin.1st round to build libcxx without libcxxabi.
# Get libcxx. svn co http://llvm.org/svn/llvm-project/libcxx/trunk libcxx cd libcxx # It is not recommended to build libcxx in the source root directory. # So, we make a tmp directory. mkdir tmp cd tmp # Specifying CMAKE_BUILD_TYPE to Release shall generate performance optimized code. # The CMAKE_INSTALL_PREFIX changes the install path from the default /usr/local to /usr. cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=/usr -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++ .. sudo make install cd .. rm tmp -rf cd ..Build libcxxabi with libc++.
# Get libcxxabi. svn co http://llvm.org/svn/llvm-project/libcxxabi/trunk libcxxabi cd libcxxabi mkdir tmp cd tmp cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=/usr -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++ -DLIBCXXABI_LIBCXX_INCLUDES=../../libcxx/include .. sudo make install cd ../..2nd round to build libcxx with libcxxabi.
cd libcxx mkdir tmp cd tmp # This time, we want to compile libcxx with libcxxabi, so we have to specify LIBCXX_CXX_ABI=libcxxabi and the path to libcxxabi headers, LIBCXX_LIBCXXABI_INCLUDE_PATHS. cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=/usr -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++ -DLIBCXX_CXX_ABI=libcxxabi -DLIBCXX_CXX_ABI_INCLUDE_PATHS=../../libcxxabi/include .. sudo make installWrite a C++ test program.
// t.cpp #include <iostream> using namespace std; int main() { cout << "Hello world!" << endl; }Test C++ compilation by clang++.
# -std specifies the C++ standard. -stdlib specifies the C++ library you want to use with clang/clang++. -lc++abi is necessary, because the new LD (linker and loader) on CentOS 7 doesn't allow indirect library linking. clang++ -std=c++11 -stdlib=libc++ -lc++abi t.cpp ./a.out
References:
[1] http://libcxx.llvm.org/
[2] http://libcxxabi.llvm.org/
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