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e24baca557
These flags used to be necessary when we first were cross-compiling clang, but more recent (although now old) changes have made them actually unnecessary. Differential Revision: https://phabricator.services.mozilla.com/D168033
54 lines
1.8 KiB
Plaintext
54 lines
1.8 KiB
Plaintext
build-clang.py
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==============
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A script to build clang from source.
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```
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usage: build-clang.py [-h] -c CONFIG [--clean]
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optional arguments:
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-h, --help show this help message and exit
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-c CONFIG, --config CONFIG
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Clang configuration file
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--clean Clean the build directory
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```
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Pre-requisites
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--------------
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* Working build toolchain.
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* git
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* CMake
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* Ninja
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* Python 2.7 and 3
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Please use the latest available CMake for your platform to avoid surprises.
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Config file format
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------------------
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build-clang.py accepts a JSON config format with the following fields:
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* stages: Use 1, 2, 3 or 4 to select different compiler stages. The default is 2.
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* cc: Path to the bootsraping C Compiler.
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* cxx: Path to the bootsraping C++ Compiler.
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* as: Path to the assembler tool.
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* ar: Path to the library archiver tool.
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* ranlib: Path to the ranlib tool (optional).
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* ld: Path to the linker.
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* patches: Optional list of patches to apply.
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* build_type: The type of build to make. Supported types: Release, Debug, RelWithDebInfo or MinSizeRel.
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* targets: The targets supported by the final stage LLVM/clang.
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* build_clang_tidy: Whether to build clang-tidy with the Mozilla checks imported. The default is false.
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* osx_cross_compile: Whether to invoke CMake for OS X cross compile builds.
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* assertions: Whether to enable LLVM assertions. The default is false.
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* pgo: Whether to build with PGO (requires stages == 4). The default is false.
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The revisions are defined in taskcluster/ci/fetch/toolchains.yml. They are usually commit sha1s corresponding to upstream tags.
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Environment Variables
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---------------------
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The following environment variables are used for cross-compile builds targeting OS X on Linux.
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* CROSS_SYSROOT: Path to the OS X SDK directory for cross compile builds.
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