CMake 不编译具有非标准扩展名的文件

Question

I have a project which have custom scripts which auto-generate C++ code files with nonstandard extensions (.acpp and .ah for generated source files and headers respectively). However, this code is not compiled as I get linker errors when compiling which disappear when renaming the files from .acpp to .cpp.

set(HEADER_FILES
    normal.h
    foo.ah
)


set(SOURCE_FILES
    normal.cpp
    foo.acpp
)

add_library(lib STATIC ${SOURCE_FILES} ${HEADER_FILES})

In the above case, only normal.cpp is compiled and if it calls functions defined in foo.acpp there would be linker errors.

I have attempted to use:

• list(APPEND CMAKE_CXX_SOURCE_FILE_EXTENSIONS acpp)
• SET_SOURCE_FILES_PROPERTIES(${SOURCE_FILES} PROPERTIES LANGUAGE CXX)
• add_definitions("-x c++")
• set_target_properties(lib PROPERTIES LINKER_LANGUAGE CXX)

And have looked at these related questions:

• CMake and non-standard extensions
• https://cmake.org/pipermail/cmake/2015-March/060137.html

Answer 1

Using CMake 3.22.0 set_source_files_properties(file.nonstandard_extention PROPERTIES LANGUAGE C) or LANGUAGE CXX worked to treat a file as either C or C++. Testing on MacOS AppleClang 13.0. See CMake docs here .