From f0cf12771f45c2c2ec2b3fe696a2a395bb9ac155 Mon Sep 17 00:00:00 2001
From: "henrike@webrtc.org"
 <henrike@webrtc.org@4adac7df-926f-26a2-2b94-8c16560cd09d>
Date: Mon, 16 Jun 2014 21:35:20 +0000
Subject: Makes it possible to prevent some third party libraries (jsoncpp and
 openssl) from being linked. This makes it possible to link webrtc with
 external implementations of those libraries in case the project depending on
 webrtc requires another version of those libraries.

BUG=3379
R=wu@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/17699005

git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@6455 4adac7df-926f-26a2-2b94-8c16560cd09d
---
 base/base.gyp     | 70 +++++++++++++++++++++++++++++++++++++++++++++----------
 build/common.gypi |  6 +++++
 2 files changed, 64 insertions(+), 12 deletions(-)

diff --git a/base/base.gyp b/base/base.gyp
index 5cb1fd9b..d8972277 100644
--- a/base/base.gyp
+++ b/base/base.gyp
@@ -452,8 +452,22 @@
             ],
           },
         }, {
-          'dependencies': [
-            '<(DEPTH)/third_party/jsoncpp/jsoncpp.gyp:jsoncpp',
+          'conditions': [
+            ['external_libraries==0', {
+              'dependencies': [
+                '<(DEPTH)/third_party/jsoncpp/jsoncpp.gyp:jsoncpp',
+              ],
+            }, {
+              'include_dirs': [
+                '<(json_root)',
+              ],
+              'defines': [
+                # When defined changes the include path for json.h to where it
+                # is expected to be when building json outside of the standalone
+                # build.
+                'WEBRTC_EXTERNAL',
+              ],
+            }],
           ],
           'sources!': [
             '../overrides/webrtc/base/basictypes.h',
@@ -474,8 +488,16 @@
               'HAVE_OPENSSL_SSL_H',
             ],
           },
-          'dependencies': [
-            '<(DEPTH)/third_party/openssl/openssl.gyp:openssl',
+          'conditions': [
+            ['external_libraries==0', {
+              'dependencies': [
+                '<(DEPTH)/third_party/openssl/openssl.gyp:openssl',
+              ],
+            }, {
+              'include_dirs': [
+                '<(ssl_root)',
+              ],
+            }],
           ],
         }, {
           'defines': [
@@ -533,8 +555,16 @@
               ],
             },
           },
-          'dependencies': [
-            '<(DEPTH)/net/third_party/nss/ssl.gyp:libssl',
+           'conditions': [
+            ['external_libraries==0', {
+              'dependencies': [
+                '<(DEPTH)/net/third_party/nss/ssl.gyp:libssl',
+              ]
+            }, {
+              'include_dirs': [
+                '<(ssl_root)',
+              ],
+            }],
           ],
         }],
         ['OS=="linux"', {
@@ -693,15 +723,31 @@
           ],
         }],
         ['OS == "mac" or OS == "ios" or OS == "win"', {
-          'dependencies': [
-            '<(DEPTH)/net/third_party/nss/ssl.gyp:libssl',
-            '<(DEPTH)/third_party/nss/nss.gyp:nspr',
-            '<(DEPTH)/third_party/nss/nss.gyp:nss',
+          'conditions': [
+            ['external_libraries==0', {
+              'dependencies': [
+                '<(DEPTH)/net/third_party/nss/ssl.gyp:libssl',
+                '<(DEPTH)/third_party/nss/nss.gyp:nspr',
+                '<(DEPTH)/third_party/nss/nss.gyp:nss',
+              ],
+            }, {
+              'include_dirs': [
+                '<(ssl_root)',
+              ],
+            }],
           ],
         }],
         ['os_posix == 1 and OS != "mac" and OS != "ios" and OS != "android"', {
-          'dependencies': [
-            '<(DEPTH)/build/linux/system.gyp:ssl',
+          'conditions': [
+            ['external_libraries==0', {
+              'dependencies': [
+                '<(DEPTH)/build/linux/system.gyp:ssl',
+              ],
+            }, {
+              'include_dirs': [
+                '<(ssl_root)',
+              ],
+            }],
           ],
         }],
       ],
diff --git a/build/common.gypi b/build/common.gypi
index da96c1d3..5625c332 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -54,6 +54,12 @@
     'webrtc_vp8_dir%': '<(webrtc_vp8_dir)',
     'include_opus%': '<(include_opus)',
     'rbe_components_path%': '<(rbe_components_path)',
+    'external_libraries%': '0',
+    'json_root%': '<(DEPTH)/third_party/jsoncpp/source/include/',
+    # openssl needs to be defined or gyp will complain. Is is only used when
+    # when providing external libraries so just use current directory as a
+    # placeholder.
+    'ssl_root%': '.',
 
     # The Chromium common.gypi we use treats all gyp files without
     # chromium_code==1 as third party code. This disables many of the
-- 
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