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NDN项目组代码修改时链接静态库的方法

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NDN项目组代码修改时链接静态库的方法

NDN项目组各个源代码都是采用waf来构建的，所以如果需要新添加自己的静态链接库，可以按如下方法操作，此处以添加jsoncpp库为例。

首先保证要引入的链接库已经安装，比如如果没有安装jsoncpp，可以执行下面的命令安装
```
sudo apt install libjsoncpp-dev
```

接着需要修改项目根目录下的wscript文件，需要修改三个地方

首先需要修改options：

  def options(opt):
  opt.load(['compiler_cxx', 'gnu_dirs'])
  opt.load(['default-compiler-flags', 'compiler-features',
            'coverage', 'pch', 'sanitizers', 'boost',
            'dependency-checker', 'unix-socket', 'websocket',
            'doxygen', 'sphinx_build', 'cmake'],
           tooldir=['.waf-tools'])

  nfdopt = opt.add_option_group('NFD Options')

  opt.addUnixOptions(nfdopt)
  opt.addDependencyOptions(nfdopt, 'libresolv') 
  opt.addDependencyOptions(nfdopt, 'librt')
  opt.addDependencyOptions(nfdopt, 'libpcap')
  opt.addDependencyOptions(nfdopt, 'libjsoncpp')  # 这一行便是新添加的
  nfdopt.add_option('--without-libpcap', action='store_true', default=False,
                    help='Disable libpcap (Ethernet face support will be disabled)')
  nfdopt.add_option('--without-systemd', action='store_true', default=False,
                    help='Disable systemd integration')
  opt.addWebsocketOptions(nfdopt)

  nfdopt.add_option('--with-tests', action='store_true', default=False,
                    help='Build unit tests')
  nfdopt.add_option('--with-other-tests', action='store_true', default=False,
                    help='Build other tests')

接着需要修改configure函数（这样在执行./waf configure的时候会检查jsoncpp有没有安装）

  def configure(conf):
  conf.load(['compiler_cxx', 'gnu_dirs',
             'default-compiler-flags', 'compiler-features',
             'pch', 'boost', 'dependency-checker', 'websocket',
             'doxygen', 'sphinx_build'])

  conf.env.WITH_TESTS = conf.options.with_tests
  conf.env.WITH_OTHER_TESTS = conf.options.with_other_tests

  conf.find_program('bash', var='BASH')

  if 'PKG_CONFIG_PATH' not in os.environ:
      os.environ['PKG_CONFIG_PATH'] = Utils.subst_vars('${LIBDIR}/pkgconfig', conf.env)
  conf.check_cfg(package='libndn-cxx', args=['--cflags', '--libs'], uselib_store='NDN_CXX')

  if not conf.options.without_systemd:
      conf.check_cfg(package='libsystemd', args=['--cflags', '--libs'],
                     uselib_store='SYSTEMD', mandatory=False)

  conf.checkDependency(name='librt', lib='rt', mandatory=False)
  conf.checkDependency(name='libresolv', lib='resolv', mandatory=False)
  conf.checkDependency(name='libjsoncpp', lib='jsoncpp', mandatory=False) # 这一行是新添加的

  .....

最后需要在build函数引入所需的链接库

def build(bld):
  versionhpp(bld)

  bld(features='subst',
      name='version.cpp',
      source='core/version.cpp.in',
      target='core/version.cpp',
      install_path=None,
      VERSION_STRING=VERSION_BASE,
      VERSION_BUILD=VERSION)

  bld.objects(
      target='core-objects',
      features='pch',
      source=bld.path.find_node('core').ant_glob('*.cpp') + ['core/version.cpp'],
      use='version.cpp version.hpp NDN_CXX BOOST LIBRT',
      includes='.',
      export_includes='.',
      headers='core/common.hpp')

  nfd_objects = bld.objects(
      target='daemon-objects',
      source=bld.path.ant_glob('daemon/**/*.cpp',
                               excl=['daemon/face/*ethernet*.cpp',
                                     'daemon/face/pcap*.cpp',
                                     'daemon/face/unix*.cpp',
                                     'daemon/face/websocket*.cpp',
                                     'daemon/main.cpp']),
      use='core-objects',
      includes='daemon',
      export_includes='daemon')
  nfd_objects.use += ' LIBJSONCPP'  # 这一行是新添加的（需要全部大写）
  ...

完成上述过程之后，就可以开始编译了，执行./waf configure看看：