wehub-resource-sync
128 lines
5.4 KiB
CMake
128 lines
5.4 KiB
CMake
cmake_minimum_required(VERSION 3.16...3.27)
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# Instead of building separate executables (one per snippet), we build a single
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# "snippets" binary with a dispatcher. Each snippet's `main` is renamed to `<name>_main`
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# at configure time, and a generated dispatcher routes `argv[1]` to the right function.
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file(GLOB_RECURSE sources_list CONFIGURE_DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/all/*.cpp)
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# Not complete examples (code fragments without main):
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list(FILTER sources_list EXCLUDE REGEX .*/concepts/static/*)
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list(FILTER sources_list EXCLUDE REGEX .*/migration/log_tick_enabled.*)
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list(FILTER sources_list EXCLUDE REGEX .*/migration/transactional_transforms/*)
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list(FILTER sources_list EXCLUDE REGEX .*/tutorials/custom-application-id.*)
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list(FILTER sources_list EXCLUDE REGEX .*/tutorials/custom-recording-id.*)
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list(FILTER sources_list EXCLUDE REGEX .*/tutorials/log-file.*)
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list(FILTER sources_list EXCLUDE REGEX .*/tutorials/log_line.*)
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list(FILTER sources_list EXCLUDE REGEX .*/tutorials/quick_start.*)
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list(FILTER sources_list EXCLUDE REGEX .*/tutorials/timelines_example.*)
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set(GENERATED_DIR "${CMAKE_CURRENT_BINARY_DIR}/generated_snippets")
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file(MAKE_DIRECTORY "${GENERATED_DIR}")
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set(ALL_GENERATED_SOURCES "")
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set(FORWARD_DECLARATIONS "")
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set(DISPATCH_ENTRIES "")
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set(SNIPPET_NAMES "")
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foreach(SOURCE_PATH ${sources_list})
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get_filename_component(SOURCE_NAME ${SOURCE_PATH} NAME_WLE)
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if(${SOURCE_NAME} STREQUAL "CMakeFiles")
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continue()
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endif()
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# C++ identifier: replace dashes with underscores.
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string(REPLACE "-" "_" FUNC_NAME "${SOURCE_NAME}")
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# Read the original source and validate the entry point signature.
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file(READ "${SOURCE_PATH}" SOURCE_CONTENT)
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string(FIND "${SOURCE_CONTENT}" "int main(int argc, char* argv[])" _pos)
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if(_pos EQUAL -1)
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message(FATAL_ERROR
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"Snippet '${SOURCE_PATH}' does not use the expected signature: "
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"int main(int argc, char* argv[]). "
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"All snippets must use this exact signature."
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)
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endif()
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# Rename main -> <func_name>_main.
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string(REPLACE
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"int main(int argc, char* argv[])"
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"int ${FUNC_NAME}_main(int argc, char* argv[])"
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SOURCE_CONTENT "${SOURCE_CONTENT}"
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)
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# Make non-main helper functions `static` to avoid duplicate symbols when
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# multiple snippets define functions with the same name (e.g. `run_main`, `truncated_radians`).
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# If a new snippet adds a helper function that conflicts, the linker will error with
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# "duplicate symbol" - add a new REPLACE line here to fix it.
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string(REPLACE "arrow::Status run_main()" "static arrow::Status run_main()" SOURCE_CONTENT "${SOURCE_CONTENT}")
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string(REPLACE "float truncated_radians(int deg)" "static float truncated_radians(int deg)" SOURCE_CONTENT "${SOURCE_CONTENT}")
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# Prepend per-file fixups before the original source:
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# - #define renames for user types that would otherwise cause ODR violations across snippets
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# (macros don't expand in string literals, so component name strings are preserved).
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# Add new defines here if a new snippet introduces a conflicting type name.
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# - #line restores __FILE__ to the original path so that snippets using
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# `fs::path(__FILE__).parent_path()` (e.g. encoded_image.cpp) find adjacent assets.
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string(PREPEND SOURCE_CONTENT
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"#define CustomPosition3D ${FUNC_NAME}_CustomPosition3D\n"
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"#define CustomPoints3D ${FUNC_NAME}_CustomPoints3D\n"
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"#define Confidence ${FUNC_NAME}_Confidence\n"
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"#line 1 \"${SOURCE_PATH}\"\n"
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)
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# If the last statement before the closing `}` isn't a `return`, add `return 0;`.
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# This handles cases where `return` only appears in nested blocks (e.g. `if (argc < 2) return 1;`)
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# but the main function body falls off the end without returning.
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string(REGEX MATCH "return [^;]*;[ \t\r\n]*}[ \t\r\n]*$" _ends_with_return "${SOURCE_CONTENT}")
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if(NOT _ends_with_return)
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string(REGEX REPLACE "}[ \t\r\n]*$" " return 0;\n}\n" SOURCE_CONTENT "${SOURCE_CONTENT}")
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endif()
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# Write the transformed source.
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file(WRITE "${GENERATED_DIR}/${FUNC_NAME}.cpp" "${SOURCE_CONTENT}")
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list(APPEND ALL_GENERATED_SOURCES "${GENERATED_DIR}/${FUNC_NAME}.cpp")
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# Build dispatcher data.
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# CLI name keeps original dashes.
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string(APPEND FORWARD_DECLARATIONS "int ${FUNC_NAME}_main(int argc, char* argv[]);\n")
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string(APPEND DISPATCH_ENTRIES " {\"${SOURCE_NAME}\", ${FUNC_NAME}_main},\n")
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list(APPEND SNIPPET_NAMES "${SOURCE_NAME}")
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endforeach()
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# Sort snippet names for the usage message.
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list(SORT SNIPPET_NAMES)
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set(SNIPPET_LIST_LITERAL "")
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foreach(_name ${SNIPPET_NAMES})
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string(APPEND SNIPPET_LIST_LITERAL " \"${_name}\",\n")
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endforeach()
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# Generate the dispatcher from template, substituting @VARIABLES@.
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configure_file(
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"${CMAKE_CURRENT_SOURCE_DIR}/snippet_dispatcher.cpp.in"
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"${GENERATED_DIR}/snippet_dispatcher.cpp"
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@ONLY
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)
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# Build the single executable.
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add_executable(snippets
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"${GENERATED_DIR}/snippet_dispatcher.cpp"
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${ALL_GENERATED_SOURCES}
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)
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rerun_strict_warning_settings(snippets)
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# Renamed mains lose the compiler's special `main` treatment that suppresses
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# unused-parameter warnings for argc/argv.
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if(MSVC)
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target_compile_options(snippets PRIVATE /wd4100)
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else()
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target_compile_options(snippets PRIVATE -Wno-unused-parameter)
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endif()
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target_link_libraries(snippets PRIVATE rerun_sdk loguru::loguru rerun_arrow_target)
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