Build Skia for a bare-bones embedded Linux system.

gyp/common_variables.gypi

 # Copyright 2012 The Android Open Source Project
 #
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   # Get ready for the ugly...
   #
   # - We have to nest our variables dictionaries multiple levels deep, so that
   #   this and other gyp files can rely on previously-set variable values in
@@ skipping 75 matching lines @@
           'skia_arch_type%': 'arm',
           'arm_version%': 7,
           'arm_neon%': 0, # neon asm files known not to work with the ios build
         },{ # skia_os is not ios
           'skia_arch_type%': 'x86',
           'arm_version%': 0,
           'arm_neon%': 0,
         }],
       ],
 
+      # skia_freetype_static - on OS variants that normally would
+      #     dynamically link the system FreeType library, don't do that;
+      #     instead statically link to the version in third_party/freetype
+      #     and third_party/externals/freetype.
+      'skia_freetype_static%': 'skia_os in ["android", "nacl"]',

[scroggo, 2014/02/18 21:46:24]

It seems like these aren't really "common". Aren't they only used by
freetype.gyp? Similar for the others.

[borenet, 2014/02/18 22:15:36]

I could go either way, but I think it makes sense for any variables we might
want to modify through GYP_DEFINES to be in this file. It kind of documents
which options are available.

[hal.canary, 2014/02/19 15:21:03]

It looks like many of the variables are only used by a single other .gyp file.

+
+      # skia_freetype_dynamic - use the system-proviced version of the
+      #     FreeType library.  If both skia_freetype_dynamic and
+      #     skia_freetype_static are true, skia_freetype_static takes
+      #     precedence.

[borenet, 2014/02/18 22:15:36]

I don't like these conflicting variables. "not skia_freetype_static" should be
sufficient.

[hal.canary, 2014/02/19 15:21:03]

More inspection indicated that if we got to freetype.gyp:freetype,
skia_freetype_dynamic was already defined.  So I can safely remove it.

+      'skia_freetype_dynamic%':
+        'skia_os in ["linux", "freebsd", "openbsd", "solaris", "chromeos"]',
+
+      # skia_giflib_static - on OS variants that normally would link giflib
+      #     with '-lgif' and include the headers from '/usr/include/gif_lib.h',
+      #     don't do that; instead compile and staticlly link the version of
+      #     giflib in third_party/externals/giflib.
+      'skia_giflib_static%': '0',
+
+      # skia_libpng_static - on OS variants that normally would link libpng
+      #     with '-lpng' and include the headers from '/usr/include/png.h',
+      #     don't do that; instead compile and staticlly link the version of
+      #     libpng in third_party/externals/libpng.
+      'skia_libpng_static%': '0',
+
+      # skia_zlib_static - on OS variants that normally would link zlib with
+      #     '-lz' or libz.dylib and include the headers from '<zlib.h>',
+      #     don't do that; instead compile and staticlly link the version of
+      #     zlib in third_party/externals/zlib.
+      'skia_zlib_static%': '0',
+
+      # skia_no_fontconfig - On POSIX systems that would normally use the
+      #     SkFontHost_fontconfig interface; use the SkFontHost_linux
+      #     version instead.
+      'skia_no_fontconfig%': '0',
+
       'skia_sanitizer%': '',
       'skia_scalar%': 'float',
       'skia_mesa%': 0,
       'skia_stroke_path_rendering%': 0,
       'skia_android_path_rendering%': 0,
       'skia_resource_cache_mb_limit%': 0,
       'skia_resource_cache_count_limit%': 0,
       'skia_angle%': 0,
       'skia_directwrite%': 0,
       'skia_gpu%': 1,
@@ skipping 38 matching lines @@
       }],
     ],
 
     # Re-define all variables defined within the level-2 'variables' dict,
     # so that siblings of the level-1 'variables' dict can see them.
     'arm_version%': '<(arm_version)',
     'arm_neon%': '<(arm_neon)',
     'arm_neon_optional%': 0,
     'skia_os%': '<(skia_os)',
     'os_posix%': '<(os_posix)',
+
+    'skia_freetype_static%': '<(skia_freetype_static)',
+    'skia_freetype_dynamic%': '<(skia_freetype_dynamic)',
+    'skia_giflib_static%': '<(skia_giflib_static)',
+    'skia_libpng_static%': '<(skia_libpng_static)',
+    'skia_zlib_static%': '<(skia_zlib_static)',
+    'skia_no_fontconfig%': '<(skia_no_fontconfig)',
     'skia_sanitizer%': '<(skia_sanitizer)',
     'skia_scalar%': '<(skia_scalar)',
     'skia_mesa%': '<(skia_mesa)',
     'skia_stroke_path_rendering%': '<(skia_stroke_path_rendering)',
     'skia_android_framework%': '<(skia_android_framework)',
     'skia_android_path_rendering%': '<(skia_android_path_rendering)',
     'skia_resource_cache_mb_limit%': '<(skia_resource_cache_mb_limit)',
     'skia_resource_cache_count_limit%': '<(skia_resource_cache_count_limit)',
     'skia_angle%': '<(skia_angle)',
     'skia_poppler_enabled%': '<(skia_poppler_enabled)',
@@ skipping 13 matching lines @@
     'skia_win_debuggers_path%': '<(skia_win_debuggers_path)',
     'skia_run_pdfviewer_in_gm%': 0,
     'skia_disable_inlining%': 0,
 
     # These are referenced by our .gypi files that list files (e.g. core.gypi)
     #
     'skia_src_path%': '../src',
     'skia_include_path%': '../include',
   },
 }