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build-clang.py
==============
A script to build clang from source.
```
usage: build-clang.py [-h] -c CONFIG [--clean]
optional arguments:
-h, --help show this help message and exit
-c CONFIG, --config CONFIG
Clang configuration file
--clean Clean the build directory
```
Pre-requisites
--------------
* Working build toolchain.
* git
* CMake
* Ninja
* Python 2.7 and 3
Please use the latest available CMake for your platform to avoid surprises.
Config file format
------------------
build-clang.py accepts a JSON config format with the following fields:
* stages: Use 1, 2, 3 or 4 to select different compiler stages. The default is 3.
* python_path: Path to the Python 2.7 installation on the machine building clang.
* gcc_dir: Path to the gcc toolchain installation, only required on Linux.
* cc: Path to the bootsraping C Compiler.
* cxx: Path to the bootsraping C++ Compiler.
* as: Path to the assembler tool.
* ar: Path to the library archiver tool.
* ranlib: Path to the ranlib tool (optional).
* libtool: Path to the libtool tool (optional).
* ld: Path to the linker.
* patches: Optional list of patches to apply.
* build_type: The type of build to make. Supported types: Release, Debug, RelWithDebInfo or MinSizeRel.
* build_libcxx: Whether to build with libcxx. The default is false.
* build_clang_tidy: Whether to build clang-tidy with the Mozilla checks imported. The default is false.
* osx_cross_compile: Whether to invoke CMake for OS X cross compile builds.
* assertions: Whether to enable LLVM assertions. The default is false.
* pgo: Whether to build with PGO (requires stages == 4). The default is false.
The revisions are defined in taskcluster/ci/fetch/toolchains.yml. They are usually commit sha1s corresponding to upstream tags.
Environment Variables
---------------------
The following environment variables are used for cross-compile builds targeting OS X on Linux.
* CROSS_CCTOOLS_PATH: Path to the cctools directory where the cross compiler toolchain is located.
* CROSS_SYSROOT: Path to the OS X SDK directory for cross compile builds.
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