skia2/third_party/third_party.gni
Mike Klein 10d665d000 Allow most third_party targets to use system libraries if asked.
This extends the pattern in freetype2 to expat, icu, libjpeg-turbo, libpng, libwebp, and zlib, and gives all these an arg to control which to use.

Homebrew doesn't have dng_sdk, piex, or sftnly, or I'd have done the same for them too.

BUG=skia:

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=4260

DOCS_PREVIEW= https://skia.org/?cl=4260

Change-Id: I82e780502bf2217336e791787f172a6fc8f55460
Reviewed-on: https://skia-review.googlesource.com/4260
Commit-Queue: Mike Klein <mtklein@chromium.org>
Reviewed-by: Hal Canary <halcanary@google.com>
2016-11-01 16:17:38 +00:00

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# Copyright 2016 Google Inc.
#
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
template("third_party") {
config(target_name + "_public") {
if (defined(invoker.public_defines)) {
defines = invoker.public_defines
}
include_dirs = invoker.public_include_dirs
}
source_set(target_name) {
forward_variables_from(invoker, "*", [ "public_include_dirs" ])
public_configs = [ ":" + target_name + "_public" ]
# Warnings are just noise if we're not maintaining the code.
if (is_win) {
cflags = [ "/w" ]
} else {
cflags = [ "-w" ]
}
}
}
set_defaults("third_party") {
configs = default_configs - [ "//gn:warnings" ]
}
template("system") {
config(target_name + "_public") {
forward_variables_from(invoker, "*", [])
}
group(target_name) {
public_configs = [ ":" + target_name + "_public" ]
}
}