adc1b16a38
Synchronize //build_overrides/build.gni with the Chromium file of the same path and set enable_safe_libstdcxx to true by default. This more properly reassembles https://crrev.com/1266874 in PDFium. Bug: pdfium:2144 Change-Id: If20961778d16a8cfacd17de1c256901c0dcd3131 Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/117650 Commit-Queue: Lei Zhang <thestig@chromium.org> Reviewed-by: Thomas Sepez <tsepez@google.com>
Build overrides in GN
This directory is used to allow different products to customize settings for repos which are DEPS'ed in or shared.
For example: V8 can be built on its own (in a "standalone" configuration),
and it can be built as part of Chromium. V8 defines a top-level
target, //v8:d8 (a simple executable), which will only be built in the
standalone configuration. To indiate itis a standalone configuration, v8 can
create a file, build_overrides/v8.gni, containing 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, does 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 may vary as appropriate to suit 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 will 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.