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llvm/flang/README.md
Stephane Chauveau 6f805b0b7f [flang] Simplified git clone in README 
Original-commit: flang-compiler/f18@198d2e6c8a
Reviewed-on: https://github.com/flang-compiler/f18/pull/6
Tree-same-pre-rewrite: false
2018-02-09 10:09:20 +01:00

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f18

Selection of the C/C++ compiler

export CXX=.../the/path/to/g++ 
export CC=.../the/path/to/gcc

Installation of LLVM 5.0

############ Extract LLVM, CLANG and other from git in current directory. 
############         
############ Question: 
############    Do we need the Clang sources for F18? 
############    Probably not but its nice to have the Clang source as 
############    example during development. 
############    Also, we need cland-format.
############
############        

ROOT=$(pwd)
REL=release_50

# To build LLVM and Clang, we only need the head of the requested branch. 
# Remove --single-branch --depth=1 if you want access to the whole repository

git clone --branch $REL --single-branch --depth=1 https://git.llvm.org/git/llvm.git/       llvm

# The following sub-repositories are probably not needed unless you also want to 
# build clang: 

git clone --branch $REL --single-branch --depth=1 https://git.llvm.org/git/clang.git/      llvm/tools/clang
git clone --branch $REL --single-branch --depth=1 https://git.llvm.org/git/openmp.git/     llvm/projects/openmp
git clone --branch $REL --single-branch --depth=1 https://git.llvm.org/git/libcxx.git/     llvm/projects/libcxx
git clone --branch $REL --single-branch --depth=1 https://git.llvm.org/git/libcxxabi.git/  llvm/projects/libcxxabi


# List the version of all git sub-directories. They should all match $REL
for dir in $(find "$ROOT/llvm" -name .git) ; do 
  cd $dir/.. ; 
  printf " %-15s %s\n" "$(git rev-parse --abbrev-ref HEAD)" "$(pwd)" ; 
done


###########  Build LLVM & CLANG in $PREFIX 
###########  A Debug build can take a long time and a lot of disk space
###########  so I recommend making a Release build.
   
PREFIX=$ROOT/usr
mkdir $PREFIX

mkdir $ROOT/llvm/build
cd  $ROOT/llvm/build 
cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=$PREFIX ..
make -j 4
make install

Installation of Flang

######### Add $PREFIX/bin to PATH so that cmake finds llvm-config   

export "PATH=$PREFIX/bin:$PATH"

######## Get Flang sources 
git clone https://github.com/ThePortlandGroup/f18.git

######## Create a build directory for f18 
mkdir $ROOT/f18-build
cd $ROOT/f18-build
cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=$PREFIX ../f18 
make -j 4