122 lines
4.8 KiB
CMake
122 lines
4.8 KiB
CMake
# CAPNP_GENERATE_CPP ===========================================================
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#
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# Example usage:
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# find_package(CapnProto)
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# capnp_generate_cpp(CAPNP_SRCS CAPNP_HDRS schema.capnp)
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# add_executable(foo main.cpp ${CAPNP_SRCS})
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# target_link_libraries(foo PRIVATE CapnProto::capnp-rpc)
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# target_include_directories(foo PRIVATE ${CMAKE_CURRENT_BINARY_DIR})
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#
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# If you are not using the RPC features you can use 'CapnProto::capnp' in the
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# target_link_libraries call
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#
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# Configuration variables (optional):
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# CAPNPC_OUTPUT_DIR
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# Directory to place compiled schema sources (default: CMAKE_CURRENT_BINARY_DIR).
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# CAPNPC_IMPORT_DIRS
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# List of additional include directories for the schema compiler.
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# (CAPNPC_SRC_PREFIX and CAPNP_INCLUDE_DIRECTORY are always included.)
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# CAPNPC_SRC_PREFIX
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# Schema file source prefix (default: CMAKE_CURRENT_SOURCE_DIR).
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# CAPNPC_FLAGS
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# Additional flags to pass to the schema compiler.
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#
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# TODO: convert to cmake_parse_arguments
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function(CAPNP_GENERATE_CPP SOURCES HEADERS)
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if(NOT ARGN)
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message(SEND_ERROR "CAPNP_GENERATE_CPP() called without any source files.")
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endif()
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set(tool_depends ${EMPTY_STRING})
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#Use cmake targets available
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if(TARGET capnp_tool)
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set(CAPNP_EXECUTABLE capnp_tool)
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GET_TARGET_PROPERTY(CAPNPC_CXX_EXECUTABLE capnpc_cpp CAPNPC_CXX_EXECUTABLE)
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GET_TARGET_PROPERTY(CAPNP_INCLUDE_DIRECTORY capnp_tool CAPNP_INCLUDE_DIRECTORY)
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list(APPEND tool_depends capnp_tool capnpc_cpp)
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endif()
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if(NOT CAPNP_EXECUTABLE)
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message(SEND_ERROR "Could not locate capnp executable (CAPNP_EXECUTABLE).")
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endif()
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if(NOT CAPNPC_CXX_EXECUTABLE)
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message(SEND_ERROR "Could not locate capnpc-c++ executable (CAPNPC_CXX_EXECUTABLE).")
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endif()
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if(NOT CAPNP_INCLUDE_DIRECTORY)
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message(SEND_ERROR "Could not locate capnp header files (CAPNP_INCLUDE_DIRECTORY).")
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endif()
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if(DEFINED CAPNPC_OUTPUT_DIR)
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# Prepend a ':' to get the format for the '-o' flag right
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set(output_dir ":${CAPNPC_OUTPUT_DIR}")
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else()
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set(output_dir ":.")
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endif()
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if(NOT DEFINED CAPNPC_SRC_PREFIX)
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set(CAPNPC_SRC_PREFIX "${CMAKE_CURRENT_SOURCE_DIR}")
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endif()
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get_filename_component(CAPNPC_SRC_PREFIX "${CAPNPC_SRC_PREFIX}" ABSOLUTE)
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# Default compiler includes. Note that in capnp's own test usage of capnp_generate_cpp(), these
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# two variables will end up evaluating to the same directory. However, it's difficult to
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# deduplicate them because if CAPNP_INCLUDE_DIRECTORY came from the capnp_tool target property,
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# then it must be a generator expression in order to handle usages in both the build tree and the
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# install tree. This vastly overcomplicates duplication detection, so the duplication doesn't seem
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# worth fixing.
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set(include_path -I "${CAPNPC_SRC_PREFIX}" -I "${CAPNP_INCLUDE_DIRECTORY}")
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if(DEFINED CAPNPC_IMPORT_DIRS)
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# Append each directory as a series of '-I' flags in ${include_path}
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foreach(directory ${CAPNPC_IMPORT_DIRS})
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get_filename_component(absolute_path "${directory}" ABSOLUTE)
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list(APPEND include_path -I "${absolute_path}")
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endforeach()
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endif()
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set(${SOURCES})
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set(${HEADERS})
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foreach(schema_file ${ARGN})
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get_filename_component(file_path "${schema_file}" ABSOLUTE)
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get_filename_component(file_dir "${file_path}" PATH)
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if(NOT EXISTS "${file_path}")
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message(FATAL_ERROR "Cap'n Proto schema file '${file_path}' does not exist!")
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endif()
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# Figure out where the output files will go
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if (NOT DEFINED CAPNPC_OUTPUT_DIR)
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set(CAPNPC_OUTPUT_DIR "${CMAKE_CURRENT_BINARY_DIR}/")
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endif()
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# Output files are placed in CAPNPC_OUTPUT_DIR, at a location as if they were
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# relative to CAPNPC_SRC_PREFIX.
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string(LENGTH "${CAPNPC_SRC_PREFIX}" prefix_len)
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string(SUBSTRING "${file_path}" 0 ${prefix_len} output_prefix)
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if(NOT "${CAPNPC_SRC_PREFIX}" STREQUAL "${output_prefix}")
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message(SEND_ERROR "Could not determine output path for '${schema_file}' ('${file_path}') with source prefix '${CAPNPC_SRC_PREFIX}' into '${CAPNPC_OUTPUT_DIR}'.")
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endif()
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string(SUBSTRING "${file_path}" ${prefix_len} -1 output_path)
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set(output_base "${CAPNPC_OUTPUT_DIR}${output_path}")
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add_custom_command(
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OUTPUT "${output_base}.c++" "${output_base}.h"
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COMMAND "${CAPNP_EXECUTABLE}"
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ARGS compile
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-o ${CAPNPC_CXX_EXECUTABLE}${output_dir}
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--src-prefix ${CAPNPC_SRC_PREFIX}
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${include_path}
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${CAPNPC_FLAGS}
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${file_path}
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DEPENDS "${schema_file}" ${tool_depends}
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COMMENT "Compiling Cap'n Proto schema ${schema_file}"
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VERBATIM
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)
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list(APPEND ${SOURCES} "${output_base}.c++")
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list(APPEND ${HEADERS} "${output_base}.h")
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endforeach()
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set_source_files_properties(${${SOURCES}} ${${HEADERS}} PROPERTIES GENERATED TRUE)
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set(${SOURCES} ${${SOURCES}} PARENT_SCOPE)
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set(${HEADERS} ${${HEADERS}} PARENT_SCOPE)
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endfunction()
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