Add support for -Duse_system_{libxml,libxslt,sqlite}=1 for...

third_party/libxslt/libxslt.gyp

Index: third_party/libxslt/libxslt.gyp
===================================================================
--- third_party/libxslt/libxslt.gyp	(revision 12500)
+++ third_party/libxslt/libxslt.gyp	(working copy)
@@ -9,6 +9,7 @@
       ['OS=="mac"', {'os_include': 'mac'}],
       ['OS=="win"', {'os_include': 'win32'}],
     ],
+    'use_system_libxslt%': 0,
   },
   'includes': [
     '../../build/common.gypi',
@@ -16,76 +17,92 @@
   'targets': [
     {
       'target_name': 'libxslt',
-      'type': 'static_library',
-      'msvs_guid': 'F9810DE8-CBC3-4605-A7B1-ECA2D5292FD7',
-      'sources': [
-        'libxslt/attributes.c',
-        'libxslt/attributes.h',
-        'libxslt/attrvt.c',
-        'libxslt/documents.c',
-        'libxslt/documents.h',
-        'libxslt/extensions.c',
-        'libxslt/extensions.h',
-        'libxslt/extra.c',
-        'libxslt/extra.h',
-        'libxslt/functions.c',
-        'libxslt/functions.h',
-        'libxslt/imports.c',
-        'libxslt/imports.h',
-        'libxslt/keys.c',
-        'libxslt/keys.h',
-        'libxslt/libxslt.h',
-        'libxslt/namespaces.c',
-        'libxslt/namespaces.h',
-        'libxslt/numbers.c',
-        'libxslt/numbersInternals.h',
-        'libxslt/pattern.c',
-        'libxslt/pattern.h',
-        'libxslt/preproc.c',
-        'libxslt/preproc.h',
-        'libxslt/security.c',
-        'libxslt/security.h',
-        'libxslt/templates.c',
-        'libxslt/templates.h',
-        'libxslt/transform.c',
-        'libxslt/transform.h',
-        'libxslt/trio.h',
-        'libxslt/triodef.h',
-        'libxslt/variables.c',
-        'libxslt/variables.h',
-        'libxslt/win32config.h',
-        'libxslt/xslt.c',
-        'libxslt/xslt.h',
-        'libxslt/xsltconfig.h',
-        'libxslt/xsltexports.h',
-        'libxslt/xsltInternals.h',
-        'libxslt/xsltutils.c',
-        'libxslt/xsltutils.h',
-        'libxslt/xsltwin32config.h',
-        'linux/config.h',
-        'mac/config.h',
-        # TODO(port): Need a pregenerated win32/config.h?
-      ],
-      'defines': [
-        'LIBXSLT_STATIC',
-      ],
-      'include_dirs': [
-        '<(os_include)',
-        '.',
-      ],
-      'dependencies': [
-        '../libxml/libxml.gyp:libxml',
-      ],
-      'direct_dependent_settings': {
-        'defines': [
-          'LIBXSLT_STATIC',
-        ],
-        'include_dirs': [
-          '.',
-        ],
-      },
       'conditions': [
-        ['OS!="win"', {'product_name': 'xslt'}],
+        ['OS=="linux" and use_system_libxslt', {
+          'type': 'settings',
+          'direct_dependent_settings': {
+            'cflags': [
+              '<!@(python ../../build/linux/pkg_config_wrapper.py --cflags libxslt)',
+            ],
+          },
+          'link_settings': {
+            'libraries': [
+              '<!@(python ../../build/linux/pkg_config_wrapper.py --libs libxslt)',
+            ],
+          },
+        }, { # else: OS != "linux" or ! use_system_libxslt
+          'type': 'static_library',
+          'msvs_guid': 'F9810DE8-CBC3-4605-A7B1-ECA2D5292FD7',
+          'sources': [
+            'libxslt/attributes.c',
+            'libxslt/attributes.h',
+            'libxslt/attrvt.c',
+            'libxslt/documents.c',
+            'libxslt/documents.h',
+            'libxslt/extensions.c',
+            'libxslt/extensions.h',
+            'libxslt/extra.c',
+            'libxslt/extra.h',
+            'libxslt/functions.c',
+            'libxslt/functions.h',
+            'libxslt/imports.c',
+            'libxslt/imports.h',
+            'libxslt/keys.c',
+            'libxslt/keys.h',
+            'libxslt/libxslt.h',
+            'libxslt/namespaces.c',
+            'libxslt/namespaces.h',
+            'libxslt/numbers.c',
+            'libxslt/numbersInternals.h',
+            'libxslt/pattern.c',
+            'libxslt/pattern.h',
+            'libxslt/preproc.c',
+            'libxslt/preproc.h',
+            'libxslt/security.c',
+            'libxslt/security.h',
+            'libxslt/templates.c',
+            'libxslt/templates.h',
+            'libxslt/transform.c',
+            'libxslt/transform.h',
+            'libxslt/trio.h',
+            'libxslt/triodef.h',
+            'libxslt/variables.c',
+            'libxslt/variables.h',
+            'libxslt/win32config.h',
+            'libxslt/xslt.c',
+            'libxslt/xslt.h',
+            'libxslt/xsltconfig.h',
+            'libxslt/xsltexports.h',
+            'libxslt/xsltInternals.h',
+            'libxslt/xsltutils.c',
+            'libxslt/xsltutils.h',
+            'libxslt/xsltwin32config.h',
+            'linux/config.h',
+            'mac/config.h',
+            # TODO(port): Need a pregenerated win32/config.h?
+          ],
+          'defines': [
+            'LIBXSLT_STATIC',
+          ],
+          'include_dirs': [
+            '<(os_include)',
+            '.',
+          ],
+          'dependencies': [
+            '../libxml/libxml.gyp:libxml',
+          ],
+          'direct_dependent_settings': {
+            'defines': [
+              'LIBXSLT_STATIC',
+            ],
+            'include_dirs': [
+              '.',
+            ],
+          },
+          'conditions': [
+            ['OS!="win"', {'product_name': 'xslt'}],
+          ],
+        }],
       ],
     },
   ],