Make regen with --dotfile and --root work.

Also add a test for GetSelfInvocationCommandLine().

Also fix a bug in MakeAbsoluteFilePathRelativeIfPossible() found
by the new test: It now works correctly if the two paths passed in
have different slash types right after the drive letter. If handed
"C:\foo" "C:/foo/f", the function used to return "..\foo\f", now it
returns just "f". This also makes the exe_path in the gn regen command
look nicer, and might fix a few other things.

BUG=23

Change-Id: I683d6f0ef5d742686181ff11545a62c052f06605
Reviewed-on: https://gn-review.googlesource.com/c/3280
Commit-Queue: Brett Wilson <brettw@chromium.org>
Reviewed-by: Brett Wilson <brettw@chromium.org>
9 files changed
tree: 9f170a7eba39471d61d92fb48c48e6cbaa778691
  1. .clang-format
  2. .editorconfig
  3. .gitignore
  4. .style.yapf
  5. AUTHORS
  6. LICENSE
  7. OWNERS
  8. README.md
  9. base/
  10. build/
  11. docs/
  12. infra/
  13. tools/
  14. util/
README.md

GN

GN is a meta-build system that generates build files for Ninja. There is documentation in docs/.

Getting started

You can download the latest version of GN binary for Linux, macOS and Windows.

Alternatively, you can build GN from source:

git clone https://gn.googlesource.com/gn
cd gn
python build/gen.py
ninja -C out
# To run tests:
out/gn_unittests

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.

Reporting bugs

If you find a bug, you can see if it is known or report it in the bug database.

Sending patches

GN uses Gerrit for code review. The short version of how to patch is:

Register at https://gn-review.googlesource.com.

... edit code ...
ninja -C out && out/gn_unittests

Then, to upload a change for review:

git commit
git cl upload --gerrit

When revising a change, use:

git commit --amend
git cl upload --gerrit

which will add the new changes to the existing code review, rather than creating a new one.

We ask that all contributors sign Google's Contributor License Agreement (either individual or corporate as appropriate, select ‘any other Google project’).

Community

You may ask questions and follow along w/ GN‘s development on Chromium’s gn-dev@ Google Group.