John Colvin
83e4465a3b
Make them more flexible, reusable. This is a precursor to porting over python md provider code from another branch.
62 lines
2.5 KiB
CMake
62 lines
2.5 KiB
CMake
include_guard(GLOBAL)
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function(protobuf_generate_cpp_config)
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set(_options)
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set(_one_value_args
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PROTO_SOURCES_HEADER
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PROTO_DEFAULTS_HEADER
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)
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set(_multi_value_args
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PROTO_SOURCES
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PROTO_DEFAULTS
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)
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cmake_parse_arguments(_ARGS "${_options}" "${_one_value_args}" "${_multi_value_args}" ${ARGN})
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# Configure the 'config_proto_files' header. It provides an array of strings populated with the
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# files in PROTO_SOURCES. At runtime, we use this array to generate a special 'config' proto
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# message with fields for each message defined in said files. A global instance of this 'config'
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# proto is then constructed, and populated with [compile-time] defaults, and [runtime] overrides
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# (i.e., in spark.conf). Calls to `bts::config::get<T>()` retrieve the value from the field
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# associated with type `T` in this global instance.
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message(STATUS "PROTO_SOURCES: ${_ARGS_PROTO_SOURCES}")
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message(STATUS "PROTO_SOURCES_HEADER: ${_ARGS_PROTO_SOURCES_HEADER}")
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message(STATUS "PROTO_DEFAULTS_HEADER: ${_ARGS_PROTO_DEFAULTS_HEADER}")
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if (_ARGS_PROTO_SOURCES_HEADER)
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set(PROTO_SOURCES)
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set(PROTO_SOURCES_CXX_ARRAY_ITEMS "")
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foreach(_proto_path ${_ARGS_PROTO_SOURCES})
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list(APPEND PROTO_SOURCES ${_proto_path})
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string(APPEND PROTO_SOURCES_CXX_ARRAY_ITEMS "\"${_proto_path}\",\n")
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endforeach()
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list(LENGTH PROTO_SOURCES PROTO_SOURCES_LENGTH)
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message(STATUS "CONFIGURING PROTO_SOURCES_HEADER): ${_ARGS_PROTO_SOURCES_HEADER}")
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configure_file(${CMAKE_SOURCE_DIR}/cmake/config_proto_files.h.in ${_ARGS_PROTO_SOURCES_HEADER})
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endif()
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# Generate static defaults. Ideally, this would be a single string, but we use an array because
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# the compiler complains if the string is longer than 65k.
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set(_cfg_defaults_str "inline const char * config_static_defaults[] = { ")
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foreach(_cfg_file_path ${_ARGS_PROTO_DEFAULTS})
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file(READ ${_cfg_file_path} _cfg_file_content)
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string(REPLACE "\"" "\\\"" _cfg_file_content_escaped ${_cfg_file_content})
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string(REPLACE "\n" ";" _cfg_lines ${_cfg_file_content_escaped})
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foreach(_line ${_cfg_lines})
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string(APPEND _cfg_defaults_str "\n \"${_line}\",")
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endforeach(_line)
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endforeach(_cfg_file_path)
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string(APPEND _cfg_defaults_str "};")
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set(_old_cfg_defaults_str "")
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if(EXISTS ${_ARGS_PROTO_DEFAULTS_HEADER})
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file(READ ${_ARGS_PROTO_DEFAULTS_HEADER} _old_cfg_defaults_str)
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endif()
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if(NOT _cfg_defaults_str STREQUAL _old_cfg_defaults_str)
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file(WRITE "${_ARGS_PROTO_DEFAULTS_HEADER}" "${_cfg_defaults_str}")
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endif()
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endfunction()
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