linux: fix library=shared_library issues

build/common.gypi

 # Copyright (c) 2009 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.
 
 # IMPORTANT:
 # Please don't directly include this file if you are building via gyp_chromium,
 # since gyp_chromium is automatically forcing its inclusion.
 {
   'variables': {
     # .gyp files should set chromium_code to 1 if they build Chromium-specific
@@ skipping 654 matching lines @@
             ],
           }],
           ['linux_breakpad==1', {
             'cflags': [ '-gstabs' ],
             'defines': ['USE_LINUX_BREAKPAD'],
           }],
           ['library=="shared_library"', {
             # When building with shared libraries, remove the visiblity-hiding
             # flag.
             'cflags!': [ '-fvisibility=hidden' ],
+            'conditions': [
+              ['target_arch=="x64"', {
+                # Shared libraries need -fPIC on x86-64
+                'cflags': ['-fPIC']
+              }]
+            ],
           }],
         ],
       },
     }],
     ['OS=="mac"', {
       'target_defaults': {
         'variables': {
           # This should be 'mac_real_dsym%', but there seems to be a bug
           # with % in variables that are intended to be set to different
           # values in different targets, like this one.
@@ skipping 223 matching lines @@
     # and therefore SYMROOT, needs to be set at the project level.
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }
 
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