| commit | 8ce4e49a990c0579ca214ab7967139b2ea792133 | [log] [tgz] |
|---|---|---|
| author | Julie Hockett <juliehockett@google.com> | Mon Jul 02 17:31:48 2018 -0700 |
| committer | Commit Bot <commit-bot@chromium.org> | Tue Jul 10 21:24:32 2018 +0000 |
| tree | f1e1cfbbc2a3f121e6163c8d70a4f81a0b1d1087 | |
| parent | f0b4405f4e0809bcc4bb90644eccae4c806b7cd6 [diff] |
[gn] Add --export-compile-commands switch to gen Adding a command line switch to generate a compilation database (compile_commands.json) in the out/ directory. Compilation databases are used by clang-based tools (e.g. clang-tidy, clangd, clang-rename). CMake already does this with the -DEXPORT_COMPILE_COMMANDS option, which regenerates the compdb whenever the ninja files are regenerated. Use: gn gen out/<builddir> --export-compile-commands Setting this switch adds ~900ms to the `gn gen` command when run on Chromium (wihtout --export-compile-commands == 2.7sec, with --export-compile-commands == 3.6sec). Change-Id: Ia3738e340b9de60da62557fb431a68a0618957fb Reviewed-on: https://gn-review.googlesource.com/2040 Commit-Queue: Brett Wilson <brettw@chromium.org> Reviewed-by: Brett Wilson <brettw@chromium.org>
GN is a meta-build system that generates build files for Ninja.
git clone https://gn.googlesource.com/gn cd gn python build/gen.py ninja -C out
On Windows, it is expected that cl.exe, link.exe, and lib.exe can be found in PATH, so you'll want to run from a Visual Studio command prompt, or similar.
On Linux and Mac, the default compiler is clang++, a recent version is expected to be found in PATH. This can be overridden by setting CC, CXX, and AR.
GN uses Gerrit for code review. The short version of how to patch is:
... edit code ... ninja -C out && out/gn_unittests
Then, to upload a change for review:
git commit git push origin HEAD:refs/for/master # This uploads for review.
When revising a change, use:
git commit --amend git push origin HEAD:refs/for/master
which will add the new changes to the existing code review, rather than creating a new one.
TODO: AUTHORS, CLA, etc.