Msvc,cmake在cpp项目中不编译c文件的问题的处理

Aincvy

2024-08-05 约 400 字预计阅读 1 分钟

先看一段 CMakeLists.txt 的文件内容：

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add_executable(bead-server program.cpp)

target_sources(bead-server PRIVATE
    src/network.cpp
    src/bead.cpp
    src/db.cpp
    src/ast.cpp
    src/log.cpp
    src/completion.cpp
)

target_sources(bead-server PRIVATE
    dependencies/tree-sitter-cpp/src/parser.c
    dependencies/tree-sitter-cpp/src/scanner.c
)

使用上面的配置生成 vcxproj 文件的内容将会如下：

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  <ItemGroup>
    <ClCompile Include="G:\nodeProjects\bead\server\program.cpp" />
    <ClCompile Include="G:\nodeProjects\bead\server\src\network.cpp" />
    <ClCompile Include="G:\nodeProjects\bead\server\src\bead.cpp" />
    <ClCompile Include="G:\nodeProjects\bead\server\src\db.cpp" />
    <ClCompile Include="G:\nodeProjects\bead\server\src\ast.cpp" />
    <ClCompile Include="G:\nodeProjects\bead\server\src\log.cpp" />
    <ClCompile Include="G:\nodeProjects\bead\server\src\completion.cpp" />
    <None Include="G:\nodeProjects\bead\server\dependencies\tree-sitter-cpp\src\parser.c">
    </None>
    <None Include="G:\nodeProjects\bead\server\dependencies\tree-sitter-cpp\src\scanner.c">
    </None>
  </ItemGroup>

可以看到两个c文件相关的内容是 None 而不是 ClCompile，这样就会产生一个问题，在编译的时候不会编译这两个文件，从而会产生符号未定义的情况。

在 CMakeLists.txt 文件中添加下面两行即可解决问题：

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set_source_files_properties(dependencies/tree-sitter-cpp/src/parser.c PROPERTIES LANGUAGE C )
set_source_files_properties(dependencies/tree-sitter-cpp/src/scanner.c PROPERTIES LANGUAGE C)

注意要设置成 C ，而不是CXX，否则会因为符号问题而出现链接错误。

现在再来看一下 vcxproj 文件的内容，已经变成了

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  <ItemGroup>
    <ClCompile Include="G:\nodeProjects\bead\server\program.cpp" />
    <ClCompile Include="G:\nodeProjects\bead\server\src\network.cpp" />
    <ClCompile Include="G:\nodeProjects\bead\server\src\bead.cpp" />
    <ClCompile Include="G:\nodeProjects\bead\server\src\db.cpp" />
    <ClCompile Include="G:\nodeProjects\bead\server\src\ast.cpp" />
    <ClCompile Include="G:\nodeProjects\bead\server\src\log.cpp" />
    <ClCompile Include="G:\nodeProjects\bead\server\src\completion.cpp" />
    <ClCompile Include="G:\nodeProjects\bead\server\dependencies\tree-sitter-cpp\src\parser.c">
      <CompileAs Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">CompileAsC</CompileAs>
      <ScanSourceforModuleDependencies Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">false</ScanSourceforModuleDependencies>
      <CompileAs Condition="'$(Configuration)|$(Platform)'=='Release|x64'">CompileAsC</CompileAs>
      <ScanSourceforModuleDependencies Condition="'$(Configuration)|$(Platform)'=='Release|x64'">false</ScanSourceforModuleDependencies>
      <CompileAs Condition="'$(Configuration)|$(Platform)'=='MinSizeRel|x64'">CompileAsC</CompileAs>
      <ScanSourceforModuleDependencies Condition="'$(Configuration)|$(Platform)'=='MinSizeRel|x64'">false</ScanSourceforModuleDependencies>
      <CompileAs Condition="'$(Configuration)|$(Platform)'=='RelWithDebInfo|x64'">CompileAsC</CompileAs>
      <ScanSourceforModuleDependencies Condition="'$(Configuration)|$(Platform)'=='RelWithDebInfo|x64'">false</ScanSourceforModuleDependencies>
    </ClCompile>
    <ClCompile Include="G:\nodeProjects\bead\server\dependencies\tree-sitter-cpp\src\scanner.c">
      <CompileAs Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">CompileAsC</CompileAs>
      <ScanSourceforModuleDependencies Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">false</ScanSourceforModuleDependencies>
      <CompileAs Condition="'$(Configuration)|$(Platform)'=='Release|x64'">CompileAsC</CompileAs>
      <ScanSourceforModuleDependencies Condition="'$(Configuration)|$(Platform)'=='Release|x64'">false</ScanSourceforModuleDependencies>
      <CompileAs Condition="'$(Configuration)|$(Platform)'=='MinSizeRel|x64'">CompileAsC</CompileAs>
      <ScanSourceforModuleDependencies Condition="'$(Configuration)|$(Platform)'=='MinSizeRel|x64'">false</ScanSourceforModuleDependencies>
      <CompileAs Condition="'$(Configuration)|$(Platform)'=='RelWithDebInfo|x64'">CompileAsC</CompileAs>
      <ScanSourceforModuleDependencies Condition="'$(Configuration)|$(Platform)'=='RelWithDebInfo|x64'">false</ScanSourceforModuleDependencies>
    </ClCompile>
  </ItemGroup>

可以看到，已经是 ClCompile 标签了。

PS: 可能和笔者使用了vcpkg有关系，也可能没关系。