enable shared lib support in linux for lua

gyp/tools.gyp

 # GYP file to build various tools.
 #
 # To build on Linux:
 #  ./gyp_skia tools.gyp && make tools
 #
 {
   'includes': [
     'apptype_console.gypi',
   ],
   'targets': [
     {
       # Build all executable targets defined below.
       'target_name': 'tools',
       'type': 'none',
       'dependencies': [
         'bench_pictures',
         'filter',
         'lua_pictures',
         'lua_app',
         'pinspect',
         'render_pdfs',
         'render_pictures',
         'skdiff',
         'skhello',
         'skimage',
+        'sklua',
       ],
     },
     {
       'target_name': 'skdiff',
       'type': 'executable',
       'sources': [
         '../tools/skdiff.cpp',
         '../tools/skdiff.h',
         '../tools/skdiff_html.cpp',
         '../tools/skdiff_html.h',
@@ skipping 55 matching lines @@
       ],
       'dependencies': [
         'skia_lib.gyp:skia_lib',
         'flags.gyp:flags',
         'gm.gyp:gm_expectations',
         'jsoncpp.gyp:jsoncpp',
         'utils.gyp:utils',
       ],
     },
     {
+      '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': [
         '../tools/lua/lua_app.cpp',
         '../src/utils/SkLua.cpp',
       ],
       'dependencies': [
         'skia_lib.gyp:skia_lib',
         'effects.gyp:effects',
         'utils.gyp:utils',
@@ skipping 232 matching lines @@
       },
     ],
   ],
 }
 
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