GN: build Lua tools when skia_use_lua.

When we opt into Lua, this builds SampleLua into SampleApp, and the lua_app and lua_pictures tools.

I've tested this builds with and without skia_use_system_lua on my Mac laptop and Linux desktop.

I've made lua_pictures.cpp's flags static to avoid conflicts with flags in SkCommonFlags.cpp.

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=4699

DOCS_PREVIEW= https://skia.org/?cl=4699

Change-Id: I8176fd51d8a38746e7d730cfcce66da42b9a015a
Reviewed-on: https://skia-review.googlesource.com/4699
Reviewed-by: Hal Canary <halcanary@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>

1 files changed, 55 insertions, 0 deletions

diff --git a/third_party/lua/BUILD.gn b/third_party/lua/BUILD.gn
new file mode 100644
index 0000000000..9967dcd675
--- /dev/null
+++ b/third_party/lua/BUILD.gn
@@ -0,0 +1,55 @@
+# Copyright 2016 Google Inc.
+#
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+declare_args() {
+  skia_use_system_lua = false
+}
+
+import("../third_party.gni")
+
+if (skia_use_system_lua) {
+  system("lua") {
+    libs = [ "lua" ]
+  }
+} else {
+  third_party("lua") {
+    public_include_dirs = [ "src" ]
+
+    sources = [
+      "src/lapi.c",
+      "src/lauxlib.c",
+      "src/lbaselib.c",
+      "src/lbitlib.c",
+      "src/lcode.c",
+      "src/lcorolib.c",
+      "src/lctype.c",
+      "src/ldblib.c",
+      "src/ldebug.c",
+      "src/ldo.c",
+      "src/ldump.c",
+      "src/lfunc.c",
+      "src/lgc.c",
+      "src/linit.c",
+      "src/liolib.c",
+      "src/llex.c",
+      "src/lmathlib.c",
+      "src/lmem.c",
+      "src/loadlib.c",
+      "src/lobject.c",
+      "src/lopcodes.c",
+      "src/loslib.c",
+      "src/lparser.c",
+      "src/lstate.c",
+      "src/lstring.c",
+      "src/lstrlib.c",
+      "src/ltable.c",
+      "src/ltablib.c",
+      "src/ltm.c",
+      "src/lundump.c",
+      "src/lvm.c",
+      "src/lzio.c",
+    ]
+  }
+}