我有一个cpp文件，如果我只是右键单击并在Visual Studio上编译它需要大约10秒钟编译，但是在编译为项目时需要花费大量时间（这个cpp文件在20中是1）其他）。
单独编译：
1>------ Build started: Project: Xcp.Test.Boost, Configuration: Release x64 ------
1> XcpOnEthernetDisconnectSendTest.cpp
1> time(C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\bin\x86_amd64\c1xx.dll)=5.196s
1> time(C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\bin\x86_amd64\c2.dll)=5.826s
1>
编译项目：
21> XcpOnEthernetDisconnectSendTest.cpp
21> time(C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\bin\x86_amd64\c1xx.dll)=4.693s
21> Generating Code...
21> time(C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\bin\x86_amd64\c2.dll)=5.204s
21> time(C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\bin\x86_amd64\c2.dll)=6.736s
21> time(C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\bin\x86_amd64\c2.dll)=4.203s
21> time(C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\bin\x86_amd64\c2.dll)=2.118s
21> time(C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\bin\x86_amd64\c2.dll)=1.980s
21> time(C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\bin\x86_amd64\c2.dll)=1.711s
21> time(C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\bin\x86_amd64\c2.dll)=1.547s
21> time(C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\bin\x86_amd64\c2.dll)=2.327s
21> time(C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\bin\x86_amd64\c2.dll)=2.410s
21> time(C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\bin\x86_amd64\c2.dll)=5.140s
21> time(C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\bin\x86_amd64\c2.dll)=4.439s
21> time(C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\bin\x86_amd64\c2.dll)=5.175s
21> time(C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\bin\x86_amd64\c2.dll)=6.389s
21> time(C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\bin\x86_amd64\c2.dll)=3.393s
21> time(C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\bin\x86_amd64\c2.dll)=2.289s
21> time(C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\bin\x86_amd64\c2.dll)=0.341s
21> time(C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\bin\x86_amd64\c2.dll)=2.098s
21> time(C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\bin\x86_amd64\c2.dll)=1.083s
21> time(C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\bin\x86_amd64\c2.dll)=0.399s
21> time(C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\bin\x86_amd64\c2.dll)=0.006s
另外，我没有看到其他文件的多个编译时结果，但是对于这个特定的文件。有人可以解释一下吗？