[bug]CMake无法编译.虚类不能实体化

[edwardsun]

您好，
我克隆了openctp sina 和openctp华鑫sfp目录。系统为linux64
对于每个目录，我操作如下:

1. mkdir build && cd build
2. cmake .. && cmake --build .

编译会出现如下错误：
/cpp-subscriber/ctp2huaxinSTP/FtdcMdApiImpl.cpp: In static member function ‘static CThostFtdcMdApi* CThostFtdcMdApi::CreateFtdcMdApi(const char*, bool, bool)’:
/cpp-subscriber/ctp2huaxinSTP/FtdcMdApiImpl.cpp:14:35: error: invalid new-expression of abstract class type ‘CFtdcMdApiImpl’
14 | return new CFtdcMdApiImpl();
| ^
In file included from /cpp-subscriber/ctp2huaxinSTP/FtdcMdApiImpl.cpp:1:
/cpp-subscriber/ctp2huaxinSTP/FtdcMdApiImpl.h:14:7: note: because the following virtual functions are pure within ‘CFtdcMdApiImpl’:
14 | class CFtdcMdApiImpl : public CThostFtdcMdApi, public CTORATstpXMdSpi
| ^~~~~~~~~~~~~~
In file included from /cpp-subscriber/ctp2huaxinSTP/FtdcMdApiImpl.h:9:
/cpp-subscriber/ctp2huaxinSTP/6.5.1_20200908/ThostFtdcMdApi.h:163:21: note: ‘virtual int CThostFtdcMdApi::ReqQryMulticastInstrument(CThostFtdcQryMulticastInstrumentField*, int)’
163 | *virtual int ReqQryMulticastInstrument(CThostFtdcQryMulticastInstrumentField pQryMulticastInstrument, int nRequestID) = 0;
| ^~~~~~~~~~~~~~~~~~~~~~~~~

这个编译错误貌似是合理的。不知道项目组有没有计划修复。
另外，如果我把上述return new CFtdcMdApiImpl(); 改为 return NULL; 则编译通过，但链接不通过，错误如下：
[root@7687c3c3c16c build]# cmake --build .
[ 8%] Building CXX object 6.3.15_20190220/CMakeFiles/thostmduserapi_se_6.3.15_20190220.dir//FtdcMdApiImpl.cpp.o
[ 16%] Linking CXX shared library /cpp-subscriber/ctp2huaxinSTP/6.3.15_20190220/libthostmduserapi_se.so
[ 16%] Built target thostmduserapi_se_6.3.15_20190220
[ 25%] Building CXX object 6.5.1_20200908/CMakeFiles/thostmduserapi_se_6.5.1_20200908.dir//FtdcMdApiImpl.cpp.o
[ 33%] Linking CXX shared library /cpp-subscriber/ctp2huaxinSTP/6.5.1_20200908/libthostmduserapi_se.so
[ 33%] Built target thostmduserapi_se_6.5.1_20200908
[ 41%] Building CXX object 6.3.19_P1_20200106/CMakeFiles/thostmduserapi_se_6.3.19_P1_20200106.dir/__/FtdcMdApiImpl.cpp.o
[ 50%] Linking CXX shared library /cpp-subscriber/ctp2huaxinSTP/6.3.19_P1_20200106/libthostmduserapi_se.so
/usr/bin/ld: cannot find -lxfastmdapi: No such file or directory
collect2: error: ld returned 1 exit status
gmake[2]: *** [6.3.19_P1_20200106/CMakeFiles/thostmduserapi_se_6.3.19_P1_20200106.dir/build.make:97: /cpp-subscriber/ctp2huaxinSTP/6.3.19_P1_20200106/libthostmduserapi_se.so] Error 1
gmake[1]: *** [CMakeFiles/Makefile2:240: 6.3.19_P1_20200106/CMakeFiles/thostmduserapi_se_6.3.19_P1_20200106.dir/all] Error 2
gmake: *** [Makefile:91: all] Error 2

我看到动态库在那里，但cmake没看到。不知道能否改进一下？
谢谢