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Add cppyy build isolation command in README #328

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Sep 26, 2024
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Add cppyy build isolation command in README #328

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13 changes: 10 additions & 3 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -217,7 +217,6 @@ Regardless of whether you are building CppInterOP with Cling or Clang-REPL you w
export CB_PYTHON_DIR="$PWD/cppyy-backend/python"
export CPPINTEROP_DIR="$CB_PYTHON_DIR/cppyy_backend"
export CPLUS_INCLUDE_PATH="${CPLUS_INCLUDE_PATH}:${LLVM_DIR}/llvm/include:${LLVM_DIR}/clang/include:${LLVM_DIR}/build/include:${LLVM_DIR}/build/tools/clang/include"
export PYTHONPATH=$PYTHONPATH:$CPYCPPYY_DIR:$CB_PYTHON_DIR
```
If on MacOS you will also need the following environment variable defined
```
Expand All @@ -228,7 +227,6 @@ On Windows you define as follows (assumes you have defined $env:PWD_DIR= $PWD.Pa
$env:CB_PYTHON_DIR="$env:PWD_DIR\cppyy-backend\python"
$env:CPPINTEROP_DIR="$env:CB_PYTHON_DIR\cppyy_backend"
$env:CPLUS_INCLUDE_PATH="$env:CPLUS_INCLUDE_PATH;$env:LLVM_DIR\llvm\include;$env:LLVM_DIR\clang\include;$env:LLVM_DIR\build\include;$env:LLVM_DIR\build\tools\clang\include"
$env:PYTHONPATH="$env:PYTHONPATH;$env:CPYCPPYY_DIR;$env:CB_PYTHON_DIR"
```

#### Build CppInterOp
Expand Down Expand Up @@ -329,13 +327,22 @@ Note down the path to the `build` directory as `CPYCPPYY_DIR`:
export CPYCPPYY_DIR=$PWD
cd ../..
```
Export the `libcppyy` path to python:

```
export PYTHONPATH=$PYTHONPATH:$CPYCPPYY_DIR:$CB_PYTHON_DIR
```
and on Windows:
```
$env:PYTHONPATH="$env:PYTHONPATH;$env:CPYCPPYY_DIR;$env:CB_PYTHON_DIR"
```

#### Install cppyy

```
git clone --depth=1 https://github.com/compiler-research/cppyy.git
cd cppyy
python -m pip install --upgrade . --no-deps
python -m pip install --upgrade . --no-deps --no-build-isolation
cd ..
```

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