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src/build_overrides
Dirk Pranke 2c0d2f0045 Update TEAM in OWNERS for build-related directories.
Now that there's a build@chromium.org list, this CL
updates the various TEAM= entries in the OWNERS files
to reflect that.

R=agrieve@chromium.org, thakis@chromium.org, mark@chromium.org

Change-Id: I8c41a604dd89aa20c9b381090701eff699c1d302
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2209616
Reviewed-by: Mark Mentovai <mark@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Commit-Queue: Dirk Pranke <dpranke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#770658}
2020-05-20 17:39:31 +00:00
..
2020-01-07 01:55:49 +00:00

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.