Compile and install clang 3.5.0 on Linux CentOS for Redhat and Clang3.8__linux

Compiling CORECLR requires clang 3.5, and CentOS is installed Clang 3.4.2 (the most new version of Yum repos), can only manually compile the LLVM source code to install.

(Note: The CentOS version is 6.6)

I. Installation of libstdc++4.7

(Note: If it is CentOS 7.0, this step is not required)

wget http://people.centos.org/tru/devtools-2/devtools-2.repo-O/etc/yum.repos.d/devtools-2.repo
Yum Install DEVTOOLSET-2-GCC devtoolset-2-binutils devtoolset-2-gcc-c++
ln-s/opt/rh/devtoolset-2/root/usr/bin/*/usr/ local/bin/

If you do not install, the following error prompts appear when configure configures the compilation options:

We detected a missing feature in the standard C + + library that is known to is
missing in libstdc++4.6 and implemented In libstdc++4.7. There are numerous
c++11 problems with 4.6 ' s library, and we don ' t support Gccs or libstdc++ older
4.7.

Second, install Python 2.7.9

(Note: If it is CentOS 7.0, this step is not required)

CentOS 6.6 is a Python 2.6.6, and compiling LLVM requires more than 2.7 python.

1 Install the package you need to compile the python

Yum install zlib-devel
yum install bzip2-devel yum install openssl-devel yum install ncurses-devel yum
Install Sqlite-devel

2 download and extract the Python 2.7.9 source code

Cd/opt
wget--no-check-certificate https://www.python.org/ftp/python/2.7.9/Python-2.7.9.tar.xz
Tar XF PYTHON-2.7.9.TAR.XZ
CD Python-2.7.9

3 Compiling and installing the Python 2.7.9

./configure--prefix=/usr/local make
&& make Altinstall

4 point python command to Python 2.7.9

Ln-s/usr/local/bin/python2.7/usr/local/bin/python

Third, add swap partition

If the compiled machine memory is relatively small, it is recommended that you add a swap partition. I was testing the machine only 1G memory, in the compilation process, "C + +: Internal compiler error:killed (program Cc1plus)" error.

1 Create and activate the swap file (for example, 2G):

DD If=/dev/zero of=/swapfile bs=1k count=2048000
mkswap/swapfile
swapon/swapfile

2) Modify the/etc/fstab file to allow the Exchange file to start automatically loaded, add the following content:

/swapfile               swap    defaults        0 0

Iv. compiling LLVM

1) Download the source code of LLVM

HTTP://LLVM.ORG/RELEASES/3.5.0/LLVM-3.5.0.SRC.TAR.XZ
MV Llvm-3.5.0.src LLVM

2) Download the source code of Clang

CD llvm/tools
wget http://llvm.org/releases/3.5.0/cfe-3.5.0.src.tar.xz
tar xf cfe-3.5.0.src.tar.xz
MV CFE-3.5.0.SRC clang

3) Download the source code of COMPILER-RT

Cd.. /projects
wget http://llvm.org/releases/3.5.0/compiler-rt-3.5.0.src.tar.xz
Tar XF COMPILER-RT-3.5.0.SRC.TAR.XZ
MV Compiler-rt-3.5.0.src compiler-rt

4) Configure compilation options

Cd.. /.. /

mkdir Build

CD Build
.. /llvm/configure--enable-optimized CC=GCC cxx=g++

5) Compiling LLVM

Make-j2

Prompt for success after compilation:

LLVM[0]: * * * Completed release+asserts Build

6 The installation of a good LLVM

Make install

will be installed in the/usr/local/bing.

7) Check the clang version

# clang--version
clang version 3.5.0 (tags/release_350/final)

If it's an older version, you need to point the/usr/bin/clang to clang 3.5.0:

Ls-s/usr/local/bin/clang/usr/bin/clang