Building LLVM

LLVM 3.7.1 has been successfully built and tested for Linux on z Systems. The following instructions can be used for RHEL 7.1/6.6 and SLES 12/11 .

General Notes: i)When following the steps below please use a standard permission user unless otherwise specified.

ii)A directory /<source_root>/ will be referred to in these instructions, this is a temporary writeable directory anywhere you'd like to place it.

Version

3.7.1

Section 1: Installing Build Dependencies:

RHEL6:

sudo yum install -y gcc  gcc-c++ make subversion wget tar xz binutils-devel bzip2 flex	 

RHEL7:

sudo yum install -y  wget tar gcc-c++ make

SLES11:

sudo zypper install -y gcc  gcc-c++ make subversion wget tar xz binutils-devel bzip2 flex	    

SLES12:

sudo zypper install -y  wget tar gcc-c++ make

Section 2: Installing GCC 4.8.4 (FOR RHEL6 and SLES11 ONLY)

1. Download Source files

   mkdir /<source_root>/gcc
   cd /<source_root>/gcc
   svn co svn://gcc.gnu.org/svn/gcc/branches/gcc-4_8-branch@212064 gcc_srcDir
   cd gcc_srcDir/
   ./contrib/download_prerequisites
   

2. Build and Install

   mkdir -p /<source_root>/gcc/gcc_buildDir/build
   cd /<source_root>/gcc/gcc_buildDir/build
   ../../gcc_srcDir/configure --prefix="/opt/gcc" --enable-shared --with-system-zlib --enable-threads=posix --disable-multilib --enable-__cxa_atexit --enable-checking --enable-gnu-indirect-function --enable-languages="c,c++" --disable-bootstrap
   make
   sudo make install
   

3. Creating Symbolic link of GLIBCXX_3.4.18

   cd /usr/lib64/
   sudo cp  /opt/gcc/lib64/libstdc++.so.6.0.19 .
   sudo rm /usr/lib64/libstdc++.so.6
   sudo ln -s libstdc++.so.6.0.19 libstdc++.so.6
   

4. Update user PATH and shared library cache

   sudo rm -f /usr/bin/gcc
   sudo ln -s /opt/gcc/bin/gcc /usr/bin/gcc
   export PATH=/opt/gcc/bin:$PATH
   sudo sh -c "echo '/opt/gcc/lib64' >> /etc/ld.so.conf.d/gcc.conf"
   sudo /sbin/ldconfig
   

Section 3: Installing Python 2.7.9 (FOR RHEL6, SLES11 and SLES12 ONLY)

1. Download Source files

    cd /<source_root>/
    wget https://www.python.org/ftp/python/2.7.9/Python-2.7.9.tar.xz
    tar -xvf Python-2.7.9.tar.xz
    cd Python-2.7.9		
   

2. Build and Install

    ./configure --prefix=/usr/local
    make
    sudo make install
   

3. Update link to new python

    sudo rm -f /usr/bin/python
    sudo ln -s /usr/local/bin/python /usr/bin/python
   

Section 4: Download Sources

1. Download Source files

   • LLVM Source Code
   • Clang Source Code
   • Compiler-rt Source Code

   cd /<source_root>/
   wget http://llvm.org/releases/3.7.1/llvm-3.7.1.src.tar.xz
   tar xvf llvm-3.7.1.src.tar.xz
   wget http://llvm.org/releases/3.7.1/cfe-3.7.1.src.tar.xz
   tar xvf cfe-3.7.1.src.tar.xz
   wget http://llvm.org/releases/3.7.1/compiler-rt-3.7.1.src.tar.xz
   tar xvf compiler-rt-3.7.1.src.tar.xz
   

2. Move the clang and compiler-rt to tools and projects folders of llvm respectively.

    mv llvm-3.7.1.src/ llvm-3.7.1
    mv cfe-3.7.1.src/ clang
    mv clang/ llvm-3.7.1/tools/
    mv compiler-rt-3.7.1.src/ compiler-rt
    mv compiler-rt/ llvm-3.7.1/projects/
   

Section 4: Build and Install LLVM

1. Configure the build

    mkdir build
    cd build
    ../llvm-3.7.1/configure --enable-optimized --enable-targets=systemz
   

2. Build the llvm source

    make
   

3. Run test cases to check the functionality

   sed -i '2d' /<source_root>/llvm-3.7.1/tools/clang/test/CodeGen/libcalls-fno-builtin.c
   make check-all
   

4. Set Environment Path

    export PATH=$PATH:/build/Release+Asserts/bin
   

5. Add LLVM to library directory

    sudo touch /etc/ld.so.conf.d/llvm.conf
    sudo chmod 777 /etc/ld.so.conf.d/llvm.conf
    echo "/<source_root>/build/Release+Asserts/lib" > /etc/ld.so.conf.d/llvm.conf
    sudo /sbin/ldconfig
   

References:

http://llvm.org/