如何省略单个源文件的调试信息

Question

我正在为解析调试信息的工具编写测试，我想省略我的调试目标中单个编译单元（源文件）的调试信息。有什么办法可以使用CMAKE完成此操作？

显然，我可以将编码器标志进行编码，但是我想在不同的OS和工具链（例如GNU和MSVC）上保持构建便携式。

即时更改CMAKE_BUILD_TYPE似乎不起作用。

Answer 1

要执行此操作，您必须修改默认标志，因为使用多构型生成器，您将无法强迫特定的构建类型。这只是一个快速示例，可以显示如何从默认值中删除调试标志，然后添加回去。然后，您可以更新此示例以使用变量来收集所有源文件，以及一些IF语句以检查哪个编译器是用于测试-g或/Zi。

cmake_minimum_required(VERSION 3.12)
project(sample)
message( "${CMAKE_CXX_FLAGS_RELEASE} = ${CMAKE_CXX_FLAGS_RELEASE}")
message( "${CMAKE_CXX_FLAGS_DEBUG} = ${CMAKE_CXX_FLAGS_DEBUG}")
string(REPLACE "-g" "" CMAKE_CXX_FLAGS_DEBUG ${CMAKE_CXX_FLAGS_DEBUG})
string(REPLACE "/Zi" "" CMAKE_CXX_FLAGS_DEBUG ${CMAKE_CXX_FLAGS_DEBUG})
string(REPLACE "-g" "" CMAKE_CXX_FLAGS_RELWITHDEBINFO ${CMAKE_CXX_FLAGS_RELWITHDEBINFO})
string(REPLACE "/Zi" "" CMAKE_CXX_FLAGS_RELWITHDEBINFO ${CMAKE_CXX_FLAGS_RELWITHDEBINFO})
message( "${CMAKE_CXX_FLAGS_DEBUG} = ${CMAKE_CXX_FLAGS_DEBUG}")
message( "${CMAKE_CXX_FLAGS_RELWITHDEBINFO} = ${CMAKE_CXX_FLAGS_RELWITHDEBINFO}")
set_source_files_properties(file1.cpp PROPERTIES COMPILE_FLAGS "/Zi")
add_executable( sample file1.cpp file2.cpp )

Answer 2

您可以访问cmake使用每个配置的默认编译标志（请参阅此答案）。您还可以在任何源文件上设置compile_flags属性。因此，在创建目标之后，它应该像查询语言的默认编译选项一样简单，并使用set_source_files_properties。

应用适当的默认值。

例如，这是一个非常简单的项目的cmakelists.txt：

cmake_minimum_required(VERSION 3.6.1)
project(MyProj)
set_source_files_properties(file1.cpp PROPERTIES COMPILE_FLAGS ${CMAKE_CXX_FLAGS_RELEASE})
get_source_file_property(FILE1_FLAGS file1.cpp COMPILE_FLAGS)
get_source_file_property(FILE2_FLAGS file2.cpp COMPILE_FLAGS)
message( "${FILE1_FLAGS} = ${FILE1_FLAGS}")
message( "${FILE2_FLAGS} = ${FILE2_FLAGS}")
add_executable( MyExe file1.cpp file2.cpp )

哪个输出（用于MSVC）：

${FILE1_FLAGS} = /MD /O2 /Ob2 /DNDEBUG
${FILE2_FLAGS} = NOTFOUND

如果您检查生成的myexe.vcxproj，您会看到默认值用于编译file2.cpp，而对于file1.cpp，所有配置都使用释放设置：

<ClCompile Include="C:tempcmakefile1.cpp">
  <InlineFunctionExpansion Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">AnySuitable</InlineFunctionExpansion>
  <Optimization Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">MaxSpeed</Optimization>
  <RuntimeLibrary Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">MultiThreadedDLL</RuntimeLibrary>
  <PreprocessorDefinitions Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">NDEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
  <InlineFunctionExpansion Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">AnySuitable</InlineFunctionExpansion>
  <Optimization Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">MaxSpeed</Optimization>
  <RuntimeLibrary Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">MultiThreadedDLL</RuntimeLibrary>
  <PreprocessorDefinitions Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">NDEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
  <InlineFunctionExpansion Condition="'$(Configuration)|$(Platform)'=='MinSizeRel|Win32'">AnySuitable</InlineFunctionExpansion>
  <Optimization Condition="'$(Configuration)|$(Platform)'=='MinSizeRel|Win32'">MaxSpeed</Optimization>
  <RuntimeLibrary Condition="'$(Configuration)|$(Platform)'=='MinSizeRel|Win32'">MultiThreadedDLL</RuntimeLibrary>
  <PreprocessorDefinitions Condition="'$(Configuration)|$(Platform)'=='MinSizeRel|Win32'">NDEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
  <InlineFunctionExpansion Condition="'$(Configuration)|$(Platform)'=='RelWithDebInfo|Win32'">AnySuitable</InlineFunctionExpansion>
  <Optimization Condition="'$(Configuration)|$(Platform)'=='RelWithDebInfo|Win32'">MaxSpeed</Optimization>
  <RuntimeLibrary Condition="'$(Configuration)|$(Platform)'=='RelWithDebInfo|Win32'">MultiThreadedDLL</RuntimeLibrary>
  <PreprocessorDefinitions Condition="'$(Configuration)|$(Platform)'=='RelWithDebInfo|Win32'">NDEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
</ClCompile>
<ClCompile Include="C:tempcmakefile2.cpp" />

我没有在其他发电机上尝试过，但是它应该起作用。