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CMake: Specify LINKER_LANGUAGE for libgnu target to fix Ninja Generator.
CMake is unable to guess the linker language for just a header file so it must be explicitly set.
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@ -1008,6 +1008,12 @@ add_library(libgnu OBJECT)
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# file. So we give it a header file that results in no output files.
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target_sources(libgnu PRIVATE lib/getopt.in.h)
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# The Ninja Generator requires setting the linker language since it cannot
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# guess the programming language of just a header file. Setting this
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# property avoids needing an empty .c file or an non-empty unnecessary .c
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# file.
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set_target_properties(libgnu PROPERTIES LINKER_LANGUAGE C)
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# Create /lib directory in the build directory and add it to the include path.
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file(MAKE_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/lib")
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target_include_directories(libgnu PUBLIC "${CMAKE_CURRENT_BINARY_DIR}/lib")
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