我想在CentOS 7上使用clang/clang++编译器来使用C++11或C++14。我该如何构建这个开发环境?
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.rpm
Install Subversion for getting the latest libcxx and libcxxabi.
sudo yum install svn
Install Clang and llvm-devel (with llvm-config).
sudo yum install clang llvm-devel
Install 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 install
Write 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
参考文献:
[1] http://libcxx.llvm.org/
[2] http://libcxxabi.llvm.org/
libcxx-3.8.0-3.el7.x86_64
is available through epel
, one can yum install libcxx
- alexus
<regex>
)与Clang 3.4.2和预安装的libstdc++在CentOS 7上。启用EPEL存储库并yum install clang
以获取Clang 3.4.2。 - phoenix