Make Mac explicitly target 10.9

Before:

[scottmg:~/work/gn ((90dcf0c7...))]$ otool -l out/gn | grep -2 LC_VERS
    uuid 79185434-2B98-355D-8C32-41A075FDECAD
Load command 9
      cmd LC_VERSION_MIN_MACOSX
  cmdsize 16
  version 10.13

After:

[scottmg:~/work/gn ((098bc140...))]$ otool -l out/gn | grep -2 LC_VERS
    uuid 368967ED-9FC0-3297-AC0E-FD1961818512
Load command 9
      cmd LC_VERSION_MIN_MACOSX
  cmdsize 16
  version 10.9

Change-Id: Iba8072f3032ef76011bc0d13b20e04bbf41dff90
Reviewed-on: https://gn-review.googlesource.com/1960
Commit-Queue: Scott Graham <scottmg@chromium.org>
Reviewed-by: Brett Wilson <brettw@chromium.org>
2 files changed
tree: 0ec9cbf2b5c11b076ccc0fdb1c8e82b1801a0784
  1. base/
  2. build/
  3. infra/
  4. tools/
  5. util/
  6. .clang-format
  7. .editorconfig
  8. .gitignore
  9. .style.yapf
  10. AUTHORS
  11. LICENSE
  12. README.md
README.md

GN

GN is a meta-build system that generates build files for Ninja.

Getting started

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.

Sending patches

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.