Mac OS X上编译mockcpp过程

OS版本：

banxia:mockcpp yangjia$ sw_vers
ProductName:    Mac OS X
ProductVersion: 10.14
BuildVersion:   18A391

mockcpp支持cmake，编译步骤如下：

cd mockcpp/mockcpp
cmake .
make

第一次编译错误

用上面的方法编译到InterfaceInfo.cpp时报错：

/Users/yangjia/repos/mockcpp/mockcpp/src/InterfaceInfo.cpp:17:12: error: 
      unknown type name '__class_type_info'
     const __class_type_info* info, unsigned int number);
           ^
/Users/yangjia/repos/mockcpp/mockcpp/src/InterfaceInfo.cpp:21:43: error: 
      unknown type name '__base_class_type_info'
getNumberOfVtblsByBaseClassTypeInfo(const __base_class_type_info& info

/Users/yangjia/repos/mockcpp/mockcpp/src/InterfaceInfo.cpp:41:29: error: 
      unknown type name '__vmi_class_type_info'
getNumberOfVtblsByVmi(const __vmi_class_type_info* vmi, unsigned int number)

难道编译器不支持rtti？
设置cmake的选项CMAKE_VERBOSE_MAKEFILE，让cmake输出编译的详细信息：

set(CMAKE_VERBOSE_MAKEFILE ON)

注意：需要在mockcpp/mockcpp/CMakeLists.txt和mockcpp/mockcpp/src/CMakeLists.txt两个文件都增加这个选项才能生效。
编译输出为：

[ 10%] Building CXX object src/CMakeFiles/mockcpp.dir/InterfaceInfo.cpp.o
cd /Users/yangjia/repos/mockcpp/mockcpp/src && /Library/Developer/CommandLineTools/usr/bin/c++  -DMOCKCPP_ALLOW_MULTI_INHERITANCE=1 -DMOCKCPP_MAX_INHERITANCE=2 -DMOCKCPP_MAX_PARAMETERS=12 -DMOCKCPP_MAX_VTBL_SIZE=20 -DMOCKCPP_NO_NAMESPACE=0 -DPACKAGE=\"mockcpp\" -DPACKAGE_BUGREPORT=\"dev.mockcpp@gmail.com\" -DPACKAGE_NAME=\"mockcpp\" -DPACKAGE_STRING=\"mockcpp\" -DPACKAGE_URL=\"http://code.google.com/p/mockcpp\" -DVERSION=\"2.6\" -I/Users/yangjia/repos/mockcpp/mockcpp/3rdparty -I/Users/yangjia/repos/mockcpp/mockcpp/include  -fPIC -o CMakeFiles/mockcpp.dir/InterfaceInfo.cpp.o -c /Users/yangjia/repos/mockcpp/mockcpp/src/InterfaceInfo.cpp

原来用的是xcode自带的clang：

$ /Library/Developer/CommandLineTools/usr/bin/c++ -v
Apple LLVM version 10.0.0 (clang-1000.10.44.4)
Target: x86_64-apple-darwin18.0.0
Thread model: posix
InstalledDir: /Library/Developer/CommandLineTools/usr/bin

果断换成gcc，设置cmake的选项CMAKE_CXX_COMPILER(mockcpp/mockcpp/src/CMakeLists.txt设置即可)：
正好用homebrew装了一个7.3.0版本的gcc，就用这个版本了：

SET(CMAKE_CXX_COMPILER /usr/local/bin/g++-7)

第二次编译错误

编译器换成g++后又报错了：

[ 10%] Building CXX object src/CMakeFiles/mockcpp.dir/AfterMatcher.cpp.o
cd /Users/yangjia/repos/mockcpp/mockcpp/src && /usr/local/bin/g++-7  -DMOCKCPP_ALLOW_MULTI_INHERITANCE=1 -DMOCKCPP_MAX_INHERITANCE=2 -DMOCKCPP_MAX_PARAMETERS=12 -DMOCKCPP_MAX_VTBL_SIZE=20 -DMOCKCPP_NO_NAMESPACE=0 -DPACKAGE=\"mockcpp\" -DPACKAGE_BUGREPORT=\"dev.mockcpp@gmail.com\" -DPACKAGE_NAME=\"mockcpp\" -DPACKAGE_STRING=\"mockcpp\" -DPACKAGE_URL=\"http://code.google.com/p/mockcpp\" -DVERSION=\"2.6\" -I/Users/yangjia/repos/mockcpp/mockcpp/3rdparty -I/Users/yangjia/repos/mockcpp/mockcpp/include  -fPIC -o CMakeFiles/mockcpp.dir/AfterMatcher.cpp.o -c /Users/yangjia/repos/mockcpp/mockcpp/src/AfterMatcher.cpp
In file included from /Users/yangjia/repos/mockcpp/mockcpp/include/mockcpp/AfterMatcher.h:24:0,
                 from /Users/yangjia/repos/mockcpp/mockcpp/src/AfterMatcher.cpp:19:
/Users/yangjia/repos/mockcpp/mockcpp/include/mockcpp/mockcpp.h:60:8: error: expected identifier before 'static_assert'
 struct static_assert
        ^~~~~~~~~~~~~

对应的代码如下：

// mockcpp.h
template <bool condition>
struct static_assert
{
    typedef int static_assert_failure[condition ? 1 : -1];
};

moclkcpp自己定义了一个static_assert，但是c++11已经引入了static_assert，两者冲突了。一个解决方案是c++11以后就不要编这段代码了：

#if __cplusplus < 201103L
template <bool condition>
struct static_assert
{
    typedef int static_assert_failure[condition ? 1 : -1];
};
#endif

用了__cplusplus预编译宏，详细说明见这里
修改后，编译终于通过了。

代码已经放到github上了。