|author||Brett Wilson <email@example.com>||Thu May 28 15:22:29 2020 +0000|
|committer||Commit Bot <firstname.lastname@example.org>||Thu May 28 15:31:18 2020 +0000|
Revert "Specify deps format for actions" This reverts commit 7d9b8111a2e0c31c429a064f0480f16bb8b51e0f. Reason for revert: Breaks backward compatibility with Ninja 1.8 which Chrome currently requires. Original change's description: > Specify deps format for actions > > Setting deps format is necessary for Ninja to store the depfile in its > internal dependency database. This can significantly speed up loading > for large dependency files, which can be the case for custom language > support, e.g. Go or Dart in Fuchsia, where we emit large depfiles from > actions. This also enables the use of `ninja -t deps` tool for custom > actions. > > We hardcode the format to gcc since the documentation for depfile > already explicitly specifies that "format is that of a Makefile". > > Change-Id: Iddaad90d6c1dcf0de40b0ed8fa005ac9c5b45bd6 > Reviewed-on: https://gn-review.googlesource.com/c/gn/+/8540 > Reviewed-by: Brett Wilson <email@example.com> > Commit-Queue: Petr Hosek <firstname.lastname@example.org> TBRemail@example.com,firstname.lastname@example.org,email@example.com # Not skipping CQ checks because original CL landed > 1 day ago. Change-Id: I4ce30794acfe0445e253719cd6c2232e296d5999 Reviewed-on: https://gn-review.googlesource.com/c/gn/+/8580 Reviewed-by: Brett Wilson <firstname.lastname@example.org> Commit-Queue: Brett Wilson <email@example.com>
GN is a meta-build system that generates build files for Ninja.
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
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
There is a simple example in examples/simple_build directory that is a good place to get started with the minimal configuration.
To build and run the simple example with the default gcc compiler:
cd examples/simple_build ../../out/gn gen -C out ninja -C out ./out/hello
For a maximal configuration see the Chromium setup:
and the Fuchsia setup:
If you find a bug, you can see if it is known or report it in the bug database.
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 push origin HEAD:refs/for/master
The first time you do this you'll get an error from the server about a missing change-ID. Follow the directions in the error message to install the change-ID hook and run
git commit --amend to apply the hook to the current commit.
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.
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 with GN‘s development on Chromium’s gn-dev@ Google Group.