efd65aebb2
to have feature parity with `configure.py`. we won't need this once we migrate to C++20 modules. but before that day comes, we need to stick with C++ headers. we generate a rule for each .hh files to create a corresponding .cc and then compile it, in order to verify the self-containness of that header. so the number of rule is quite large, to avoid the unnecessary overhead. the check-header target is enabled only if `Scylla_CHECK_HEADERS` option is enabled. Signed-off-by: Kefu Chai <kefu.chai@scylladb.com> Closes scylladb/scylladb#15913
105 lines
3.1 KiB
CMake
105 lines
3.1 KiB
CMake
function (check_headers check_headers_target target)
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if(NOT TARGET ${check_headers_target})
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return()
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endif()
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# "target" is required, so we can get the compiling options for compiling
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# the headers.
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cmake_parse_arguments (
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parsed_args
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""
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"GLOB;GLOB_RECURSE;EXCLUDE;INCLUDE"
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""
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${ARGN})
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set(sources "")
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if(DEFINED parsed_args_GLOB)
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file(GLOB sources
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LIST_DIRECTORIES false
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RELATIVE ${CMAKE_SOURCE_DIR}
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"${parsed_args_GLOB}")
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elseif(DEFINED parsed_args_GLOB_RECURSE)
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file(GLOB_RECURSE sources
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LIST_DIRECTORIES false
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RELATIVE ${CMAKE_SOURCE_DIR}
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"${parsed_args_RECURSIVE}")
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else()
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message(FATAL_ERROR "Please specify GLOB or GLOB_RECURSE.")
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endif()
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if(DEFINED parsed_args_INCLUDE)
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list(FILTER sources INCLUDE REGEX "${parsed_args_INCLUDE}")
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endif()
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if(DEFINED parsed_args_EXCLUDE)
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list(FILTER sources EXCLUDE REGEX "${parsed_args_EXCLUDE}")
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endif()
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foreach(fn ${sources})
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get_filename_component(file_dir ${fn} DIRECTORY)
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list(APPEND includes "${CMAKE_SOURCE_DIR}/${file_dir}")
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set(src_dir "${CMAKE_BINARY_DIR}/check-headers/${file_dir}")
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file(MAKE_DIRECTORY "${src_dir}")
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get_filename_component(file_name ${fn} NAME)
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set(src "${src_dir}/${file_name}.cc")
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# CMake refuses to compile .hh files, so we need to rename them first.
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add_custom_command(
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OUTPUT ${src}
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DEPENDS ${CMAKE_SOURCE_DIR}/${fn}
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# silence "-Wpragma-once-outside-header"
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COMMAND sed
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-e "s/^#pragma once//"
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"${fn}" > "${src}"
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WORKING_DIRECTORY "${CMAKE_SOURCE_DIR}"
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VERBATIM)
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list(APPEND srcs "${src}")
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endforeach()
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if(NOT srcs)
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# not headers to checks
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return()
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endif()
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set(check_lib "${check_headers_target}-${target}")
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add_library(${check_lib} EXCLUDE_FROM_ALL)
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target_sources(${check_lib}
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PRIVATE ${srcs})
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# use ${target} as an interface library by consuming all of its
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# compile time options
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get_target_property(libraries ${target} LINK_LIBRARIES)
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if (libraries)
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target_link_libraries(${check_lib}
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PRIVATE ${libraries})
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endif()
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# if header includes other header files with relative path,
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# we should satisfy it.
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list(REMOVE_DUPLICATES includes)
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target_include_directories(${check_lib}
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PRIVATE ${includes})
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get_target_property(includes ${target} INCLUDE_DIRECTORIES)
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if(includes)
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target_include_directories(${check_lib}
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PRIVATE ${includes})
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endif()
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get_target_property(compile_options ${target} COMPILE_OPTIONS)
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if(compile_options)
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target_compile_options(${check_lib}
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PRIVATE ${compile_options})
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endif ()
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# symbols in header file should always be referenced, but these
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# are just pure headers, so unused variables should be tolerated.
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target_compile_options(${check_lib}
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PRIVATE
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-Wno-unused-const-variable
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-Wno-unused-function
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-Wno-unused-variable)
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get_target_property(compile_definitions ${target} COMPILE_DEFINITIONS)
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if(compile_definitions)
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target_compile_definitions(${check_lib}
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PRIVATE ${compile_definitions})
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endif()
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add_dependencies(${check_headers_target} ${check_lib})
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endfunction ()
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