Update to more uses of C++11.

Adds move constructors to some fundamental types such as SourceFile,
SourceDir, and Label.

Removes most uses of swap and custom swap definitions in favor of move

Converts most default class member initialization to declare default
values in the definition.

Moves more to using implicit and defaulted-in-the-header constructors
and destructors. The previous style was inherited from Chrome which had
those rules out of concern for code size. But for this small project the
header-based ones are a little easier to follow.

Change-Id: I7d5c3bd4ac9863c34b1072fdefef81e59e555a7f
Reviewed-on: https://gn-review.googlesource.com/c/gn/+/5080
Commit-Queue: Brett Wilson <brettw@google.com>
Reviewed-by: Scott Graham <scottmg@chromium.org>
57 files changed
tree: abfeee47a2944a0ec9bd5219bb4345261e711ce8
  1. .clang-format
  2. .editorconfig
  3. .gitignore
  4. .style.yapf
  8. README.md
  9. base/
  10. build/
  11. docs/
  12. infra/
  13. tools/
  14. util/


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

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:

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’).


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