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我正在研究 chromium for android 的源代码：尝试在 Webkit 中开发一些功能。

我做了什么：（1）在“third_party/WebKit/Source/core/frame”中创建test.cpp/test.h：test.cpp包含addlib.h调用addlib.so中的求和函数（下一步创建) (2)通过“g++ -fPIC -shared addlib.cpp -o addlib.so”在“third_party/WebKit/Source/core/frame”中创建add.h和add.so（addlib.so只提供求和的功能两个整数并返回结果）

blink_core_sources("frame") {
 sources = [
  "BarProp.cpp",
  "BarProp.h",
  "BrowserControls.cpp",
  "BrowserControls.h",
  "ContentSettingsClient.cpp",

  .........


  "csp/ContentSecurityPolicy.cpp",
  "csp/ContentSecurityPolicy.h",
  "csp/MediaListDirective.cpp",
  "csp/MediaListDirective.h",
  "csp/SourceListDirective.cpp",
  "csp/SourceListDirective.h",

   // my modification
  "test.h",
  "test.cpp",
  "addlib.h"
]

// my modification
shared_library = [ ":addlib.so" ]
}

我的目的：在test.cpp中调用addlib.so中的函数

但是 gn 给了我错误信息：

ERROR at //third_party/WebKit/Source/core/frame/BUILD.gn:170:20:Assignment had no effect.
shared_library = [ ":addlib.so" ]
               ^-----------
You set the variable "shared_library" here and it was unused before it went out of scope.

对我有什么建议吗？非常感谢。

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