Build Skia for a bare-bones embedded Linux system.

gyp/libpng.gyp

Index: gyp/libpng.gyp
diff --git a/gyp/libpng.gyp b/gyp/libpng.gyp
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+# Copyright 2014 Google Inc.
+#
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+{
+  'variables': {
+    'skia_warnings_as_errors': 0,
+  },
+  'targets': [
+    {
+      'target_name': 'libpng',
+      'conditions': [
+        [ 'skia_libpng_static',
+          {
+            'type': 'static_library',
+            'include_dirs': [
+              '../third_party/externals/libpng',
+            ],
+            'dependencies': [
+              'zlib.gyp:zlib',
+            ],
+            'export_dependent_settings': [
+              'zlib.gyp:zlib',
+            ],
+            'direct_dependent_settings': {
+              'include_dirs': [
+                '../third_party/externals/libpng',
+              ],
+            },
+            'cflags': [
+              '-w',
+              '-fvisibility=hidden',
+            ],
+            'sources': [
+              '../third_party/externals/libpng/png.c',
+              '../third_party/externals/libpng/pngerror.c',
+              '../third_party/externals/libpng/pnggccrd.c',
+              '../third_party/externals/libpng/pngget.c',
+              '../third_party/externals/libpng/pngmem.c',
+              '../third_party/externals/libpng/pngpread.c',
+              '../third_party/externals/libpng/pngread.c',
+              '../third_party/externals/libpng/pngrio.c',
+              '../third_party/externals/libpng/pngrtran.c',
+              '../third_party/externals/libpng/pngrutil.c',
+              '../third_party/externals/libpng/pngset.c',
+              '../third_party/externals/libpng/pngtrans.c',
+              '../third_party/externals/libpng/pngvcrd.c',
+              '../third_party/externals/libpng/pngwio.c',
+              '../third_party/externals/libpng/pngwrite.c',
+              '../third_party/externals/libpng/pngwtran.c',
+              '../third_party/externals/libpng/pngwutil.c',
+            ],
+          }, {  # not skia_libpng_static
+            'type': 'none',
+            'conditions': [
+              [ 'skia_os == "android"',
+                {
+                  # TODO(halcanary): merge all png targets into this file.
+                  'dependencies': [
+                    'android_deps.gyp:png',
+                  ],
+                  'export_dependent_settings': [
+                    'android_deps.gyp:png',
+                  ],
+                }, {  # skia_os != "android"
+                  'dependencies': [
+                    'zlib.gyp:zlib',
+                    ],
+                  'export_dependent_settings': [
+                    'zlib.gyp:zlib',
+                    ],
+                  'direct_dependent_settings': {
+                    'link_settings': {
+                      'libraries': [
+                        '-lpng',
+                      ],
+                    },
+                  },
+                }
+              ]
+            ]
+          }
+        ]
+      ],
+    },
+  ]
+}