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  1. f213759 Remove mac_sdk_min_build_override. by Erik Chen · 12 days ago master
  2. 2d0551a Allow macOS default SDK to be set from environment variable. by Erik Chen · 13 days ago
  3. 406ca3f mac: Roll hermetic toolchain to Xcode 8.3.2. by erikchen · 4 weeks ago
  4. ef2440b Revert of mac: Roll hermetic toolchain to Xcode 8.3.2. (patchset #2 id:20001 of https://codereview.chromium.org/2950933003/ ) by engedy · 4 weeks ago
  5. a6d802e mac: Roll hermetic toolchain to Xcode 8.3.2. by erikchen · 4 weeks ago

Build overrides in GN

This directory is used to allow different products to customize settings for repos that are DEPS'ed in or shared.

For example: V8 could be built on its own (in a “standalone” configuration), and it could be built as part of Chromium. V8 might define a top-level target, //v8:d8 (a simple executable), that should only be built in the standalone configuration. To figure out whether or not it should be in a standalone configuration, v8 can create a file, build_overrides/v8.gni, that contains a variable, build_standalone_d8 = true. and import it (as import(“//build_overrides/v8.gni”) from its top-level BUILD.gn file.

Chromium, on the other hand, might not need to build d8, and so it would create its own build_overrides/v8.gni file, and in it set build_standalone_d8 = false.

The two files should define the same set of variables, but the values can vary as appropriate to the needs of the two different builds.

The build.gni file provides a way for projects to override defaults for variables used in //build itself (which we want to be shareable between projects).

TODO(crbug.com/588513): Ideally //build_overrides and, in particular, //build_overrides/build.gni should go away completely in favor of some mechanism that can re-use other required files like //.gn, so that we don't have to keep requiring projects to create a bunch of different files to use GN.