|author||David 'Digit' Turner <email@example.com>||Fri Apr 03 12:40:58 2020 +0200|
|committer||Commit Bot <firstname.lastname@example.org>||Mon May 04 19:13:18 2020 +0000|
Speed up generation of input files list. The list of all input files used by a project is very large for projects like Chromium and especially Fuchsia. This CL refactors the InputFileManager::GetAllPhysicalInputFiles() method in order to avoid un-necessary memory allocations and std::set<> operations. This is done by introducing a new VectorSetSorter class in "gn/vector_utils.h" that can be used to efficiently merge and sort sets of items with minimal memory usage. Change-Id: I2e4b22c7294e93ffaec28dda765d371b3f0cc301 Reviewed-on: https://gn-review.googlesource.com/c/gn/+/7941 Commit-Queue: David Turner <email@example.com> Reviewed-by: Scott Graham <firstname.lastname@example.org>
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.