enable shared lib support in linux for lua

gyp/tools.gyp

Index: gyp/tools.gyp
diff --git a/gyp/tools.gyp b/gyp/tools.gyp
index d960cdc1289b97e2227fb27053aabbf4a3f87d7f..24eeddc1616fdf5aa2c843d8bfe4060faeafdcda 100644
--- a/gyp/tools.gyp
+++ b/gyp/tools.gyp
@@ -23,6 +23,7 @@
         'skdiff',
         'skhello',
         'skimage',
+        'sklua',
       ],
     },
     {
@@ -98,6 +99,31 @@
       ],
     },
     {
+      'target_name': 'sklua',
+      'type': 'shared_library',
+      'sources': [
+        '../src/utils/SkLuaCanvas.cpp',
+        '../src/utils/SkLua.cpp',
+      ],
+      'include_dirs': [
+        '../third_party/lua/src/',
+      ],
+      'dependencies': [
+        'lua.gyp:lua',
+        'pdf.gyp:pdf',
+        'skia_lib.gyp:skia_lib',
+      ],
+      'conditions': [
+        ['skia_os != "win"',
+          {
+            'ldflags': [
+              '-Wl,-rpath', '-Wl,./',

[bungeman-skia, 2013/06/19 20:35:24]

rpath is rather heavy handed, (I think) we should also specify
'-–enable-new-dtags' to make ld use DT_RUNPATH in addition to DT_RPATH. Then it
is possible to use LD_LIBRARY_PATH to force the link when debugging. I'm not
sure if this is supported on Mac though...

Note that the issue here is the larger issue which Skia has studiously avoided,
library and installation paths. Autotools uses '--prefix' for this sort of
thing, I think.

+            ],
+          },
+        ],
+      ],
+    },
+    {
       'target_name': 'lua_app',
       'type': 'executable',
       'sources': [