Build HarfBuzz as loadable module when chromeos=1 under Linux

Build HarfBuzz as loadable module when chromeos=1 under Linux

This is a work-in-progress CL, it currently fails to link libash_sysui and libquickstart.

BUG=589342

[drott, 2016-03-09 14:07:52]

drott@chromium.org changed reviewers:
+ dpranke@chromium.org, phajdan.jr@chromium.org

[drott, 2016-03-09 14:15:00]

The first failure I get:

FAILED: python
"/usr/local/google/home/drott/dev/blink/src/build/toolchain/gcc_solink_wrapper.py"
--readelf="readelf" --nm="nm"  --sofile="./libdesktop_wm_library.so"
--tocfile="./libdesktop_wm_library.so.TOC" --output="./libdesktop_wm_library.so"
-- ../../third_party/llvm-build/Release+Asserts/bin/clang++ -shared
-Wl,--fatal-warnings -fPIC -Wl,-z,noexecstack -Wl,-z,now -Wl,-z,relro
-Wl,-z,defs -B../../third_party/binutils/Linux_x64/Release/bin -fuse-ld=gold
-Wl,--icf=all -pthread -m64 -Wl,-O1 -Wl,--gc-sections -Wl,--as-needed
-Wl,--export-dynamic -o "./libdesktop_wm_library.so"
-Wl,-soname="libdesktop_wm_library.so" @"./libdesktop_wm_library.so.rsp"
obj/ui/gfx/gfx/harfbuzz_font_skia.o:../../ui/gfx/harfbuzz_font_skia.cc:function
gfx::CreateHarfBuzzFont(SkTypeface*, float, gfx::FontRenderParams const&, bool):
error: undefined reference to 'hb_face_create_for_tables'
obj/ui/gfx/gfx/harfbuzz_font_skia.o:../../ui/gfx/harfbuzz_font_skia.cc:function
gfx::CreateHarfBuzzFont(SkTypeface*, float, gfx::FontRenderParams const&, bool):
error: undefined reference to 'hb_font_create'
[...]

The main problem seems to be other shared libraries targets failing to find the
symbols. :-( Any help would be greatly appreciated!

[Dirk Pranke, 2016-03-09 20:31:03]

As I just noted on the chromium-dev thread, I'm confused by the idea of this
patch. I don't think we need to go down this route, but maybe I'm missing
something ...