Linux: add an option to use system jsoncpp

third_party/jsoncpp/jsoncpp.gyp

Index: third_party/jsoncpp/jsoncpp.gyp
diff --git a/third_party/jsoncpp/jsoncpp.gyp b/third_party/jsoncpp/jsoncpp.gyp
index 1395f94bbf093bda189114b31e44869460210116..e4a9877e0922cfad81badb2e6aacc2f9a07b839e 100644
--- a/third_party/jsoncpp/jsoncpp.gyp
+++ b/third_party/jsoncpp/jsoncpp.gyp
@@ -3,41 +3,77 @@
 # found in the LICENSE file.
 
 {
-  'targets': [
-    {
-      'target_name': 'jsoncpp',
-      'type': 'static_library',
-      'defines': [
-        'JSON_USE_EXCEPTION=0',
+  'variables': {
+    'use_system_jsoncpp%': 0,
+  },
+  'conditions': [
+    ['use_system_jsoncpp==0', {
+      'targets': [
+        {
+          'target_name': 'jsoncpp',
+          'type': 'static_library',
+          'defines': [
+            'JSON_USE_EXCEPTION=0',
+          ],
+          'sources': [
+            'source/include/json/assertions.h',
+            'source/include/json/autolink.h',
+            'source/include/json/config.h',
+            'source/include/json/features.h',
+            'source/include/json/forwards.h',
+            'source/include/json/json.h',
+            'source/include/json/reader.h',
+            'overrides/include/json/value.h',
+            'source/include/json/writer.h',
+            'source/src/lib_json/json_batchallocator.h',
+            'source/src/lib_json/json_reader.cpp',
+            'source/src/lib_json/json_tool.h',
+            'overrides/src/lib_json/json_value.cpp',
+            'source/src/lib_json/json_writer.cpp',
+          ],
+          'include_dirs': [
+            'overrides/include/',
+            'source/include/',
+            'source/src/lib_json/',
+          ],
+          'direct_dependent_settings': {
+            'include_dirs': [
+              'overrides/include/',
+              'source/include/',
+            ],
+          },
+        },
       ],
-      'sources': [
-        'source/include/json/assertions.h',
-        'source/include/json/autolink.h',
-        'source/include/json/config.h',
-        'source/include/json/features.h',
-        'source/include/json/forwards.h',
-        'source/include/json/json.h',
-        'source/include/json/reader.h',
-        'overrides/include/json/value.h',
-        'source/include/json/writer.h',
-        'source/src/lib_json/json_batchallocator.h',
-        'source/src/lib_json/json_reader.cpp',
-        'source/src/lib_json/json_tool.h',
-        'overrides/src/lib_json/json_value.cpp',
-        'source/src/lib_json/json_writer.cpp',
+    }, { # use_system_jsoncpp==1
+      'targets': [
+        {
+          'target_name': 'jsoncpp',
+          'type': 'none',
+          'variables': {
+            'headers_root_path': 'source/include',
+            'header_filenames': [
+              'json/assertions.h',
+              'json/autolink.h',
+              'json/config.h',
+              'json/features.h',
+              'json/forwards.h',
+              'json/json.h',
+              'json/reader.h',
+              'json/value.h',
+              'json/writer.h',
+            ],
+          },
+          'includes': [
+            '../../build/shim_headers.gypi',
+          ],
+          'link_settings': {
+            'libraries': [
+              '-ljsoncpp',
+            ],
+          },
+        }
       ],
-      'include_dirs': [
-        'overrides/include/',
-        'source/include/',
-        'source/src/lib_json/',
-      ],
-      'direct_dependent_settings': {
-        'include_dirs': [
-          'overrides/include/',
-          'source/include/',
-        ],
-      },
-    },
+    }],
   ],
 }