Linux: add an option to use system minizip.

third_party/zlib/zlib.gyp

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   'variables': {
     'conditions': [
       [ 'OS=="none"', {
         # Because we have a patched zlib, we cannot use the system libz.
         # TODO(pvalchev): OpenBSD is purposefully left out, as the system
         # zlib brings up an incompatibility that breaks rendering.
         'use_system_zlib%': 1,
       }, {
         'use_system_zlib%': 0,
       }],
     ],
+    'use_system_minizip%': 0,
   },
   'targets': [
     {
       'target_name': 'zlib',
       'type': 'static_library',
       'conditions': [
         ['use_system_zlib==0', {
           'sources': [
-            'contrib/minizip/ioapi.c',
-            'contrib/minizip/ioapi.h',
-            'contrib/minizip/iowin32.c',
-            'contrib/minizip/iowin32.h',
-            'contrib/minizip/unzip.c',
-            'contrib/minizip/unzip.h',
-            'contrib/minizip/zip.c',
-            'contrib/minizip/zip.h',
             'adler32.c',
             'compress.c',
             'crc32.c',
             'crc32.h',
             'deflate.c',
             'deflate.h',
             'gzio.c',
             'infback.c',
             'inffast.c',
             'inffast.h',
             'inffixed.h',
             'inflate.c',
             'inflate.h',
             'inftrees.c',
             'inftrees.h',
             'mozzconf.h',
             'trees.c',
             'trees.h',
             'uncompr.c',
             'zconf.h',
             'zlib.h',
             'zutil.c',
             'zutil.h',
           ],
           'include_dirs': [
             '.',
-            # For contrib/minizip
-            '../..',
           ],
           'direct_dependent_settings': {
             'include_dirs': [
               '.',
             ],
           },
           'conditions': [
             ['OS!="win"', {
               'product_name': 'chrome_zlib',
-              'sources!': [
-                'contrib/minizip/iowin32.c'
-              ],
             }], ['OS=="android"', {
               'toolsets': ['target', 'host'],
             }],
           ],
         }, {
           'direct_dependent_settings': {
             'defines': [
               'USE_SYSTEM_ZLIB',
             ],
           },
           'defines': [
             'USE_SYSTEM_ZLIB',
           ],
-          'sources': [
-            'contrib/minizip/ioapi.c',
-            'contrib/minizip/ioapi.h',
-            'contrib/minizip/unzip.c',
-            'contrib/minizip/unzip.h',
-            'contrib/minizip/zip.c',
-            'contrib/minizip/zip.h',
-          ],
-          'conditions': [
-            ['OS=="android"', {
-              'toolsets': ['target', 'host'],
-            }],
-          ],
           'link_settings': {
             'libraries': [
               '-lz',
             ],
           },
         }],
+      ],
+    },
+    {
+      'target_name': 'minizip',
+      'type': 'static_library',
+      'conditions': [
+        ['use_system_minizip==0', {
+          'sources': [
+            'contrib/minizip/ioapi.c',
+            'contrib/minizip/ioapi.h',
+            'contrib/minizip/iowin32.c',
+            'contrib/minizip/iowin32.h',
+            'contrib/minizip/unzip.c',
+            'contrib/minizip/unzip.h',
+            'contrib/minizip/zip.c',
+            'contrib/minizip/zip.h',
+          ],
+          'include_dirs': [
+            '.',
+            '../..',
+          ],
+          'direct_dependent_settings': {
+            'include_dirs': [
+              '.',
+            ],
+          },
+          'conditions': [
+            ['OS!="win"', {
+              'sources!': [
+                'contrib/minizip/iowin32.c'
+              ],
+            }],
+            ['OS=="android"', {
+              'toolsets': ['target', 'host'],
+            }],
+          ],
+        }, {
+          'direct_dependent_settings': {
+            'defines': [
+              'USE_SYSTEM_MINIZIP',
+            ],
+          },
+          'defines': [
+            'USE_SYSTEM_MINIZIP',
+          ],
+          'link_settings': {
+            'libraries': [
+              '-lminizip',
+            ],
+          },
+        }],
         ['OS=="mac" or OS=="ios" or os_bsd==1 or OS=="android"', {
           # Mac, Android and the BSDs don't have fopen64, ftello64, or
           # fseeko64. We use fopen, ftell, and fseek instead on these
           # systems.
           'defines': [
             'USE_FILE32API'
           ],
         }],
         ['clang==1', {
           'xcode_settings': {
             'WARNING_CFLAGS': [
               # zlib uses `if ((a == b))` for some reason.
               '-Wno-parentheses-equality',
             ],
           },
           'cflags': [
             '-Wno-parentheses-equality',
           ],
         }],
       ],
     }
   ],
 }