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D4805.id15736.diff
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diff --git a/services/lib/cmake-components/corrosion-cxx.cmake b/services/lib/cmake-components/corrosion-cxx.cmake
new file mode 100644
--- /dev/null
+++ b/services/lib/cmake-components/corrosion-cxx.cmake
@@ -0,0 +1,125 @@
+# Detects cargo target architecture based on the Rustc compiler version
+function(detect_cargo_target_architecture)
+ find_program(RUST_compiler rustc)
+ find_program(Sed_PATH sed)
+
+ if(NOT RUST_compiler)
+ message(
+ FATAL "The rustc executable was not found")
+ endif()
+
+ if(NOT Sed_PATH)
+ message(
+ FATAL "The sed executable was not found")
+ endif()
+
+ execute_process(
+ COMMAND ${RUST_compiler} --version --verbose
+ COMMAND ${Sed_PATH} -n "s|host: ||p"
+ OUTPUT_VARIABLE DETECTED_CARGO_TARGET
+ OUTPUT_STRIP_TRAILING_WHITESPACE
+ )
+
+ if("${DETECTED_CARGO_TARGET}" STREQUAL "")
+ message(FATAL_ERROR "Cannot detect target architecture for cargo build")
+ endif()
+
+ message("Cargo target architecture detected as: ${DETECTED_CARGO_TARGET}")
+ set(RUST_cargo_target ${DETECTED_CARGO_TARGET} PARENT_SCOPE)
+endfunction(detect_cargo_target_architecture)
+
+# Creates a target including rust lib and cxxbridge which is
+# named as ${NAMESPACE}::${_LIB_PATH_STEM}
+# <_LIB_PATH_STEM> must match the crate name:
+# "path/to/myrustcrate" -> "libmyrustcrate.a"
+function(add_library_rust)
+ detect_cargo_target_architecture()
+ set(value_keywords PATH NAMESPACE CXX_BRIDGE_SOURCE_FILE)
+ cmake_parse_arguments(
+ rust_lib
+ "${OPTIONS}"
+ "${value_keywords}"
+ "${MULTI_value_KEYWORDS}"
+ ${ARGN}
+ )
+
+ if("${rust_lib_PATH}" STREQUAL "")
+ message(
+ FATAL_ERROR
+ "add_library_rust called without a given path to root of a rust crate")
+ endif()
+
+ if("${rust_lib_NAMESPACE}" STREQUAL "")
+ message(
+ FATAL_ERROR
+ "Must supply a namespace given by keyvalue NAMESPACE <value>")
+ endif()
+
+ if("${rust_lib_CXX_BRIDGE_SOURCE_FILE}" STREQUAL "")
+ set(rust_lib_CXX_BRIDGE_SOURCE_FILE "src/lib.rs")
+ endif()
+
+ if(NOT EXISTS "${CMAKE_CURRENT_LIST_DIR}/${rust_lib_PATH}/Cargo.toml")
+ message(
+ FATAL_ERROR
+ "${CMAKE_CURRENT_LIST_DIR}/${rust_lib_PATH} doesn't contain a Cargo.toml")
+ endif()
+
+ set(lib_path ${rust_lib_PATH})
+ set(namespace ${rust_lib_NAMESPACE})
+ set(cxx_bridge_source_file ${rust_lib_CXX_BRIDGE_SOURCE_FILE})
+
+ corrosion_import_crate(MANIFEST_PATH "${lib_path}/Cargo.toml")
+
+ # Set cxxbridge values
+ get_filename_component(_LIB_PATH_STEM ${lib_path} NAME)
+ message(STATUS "Library stem path: ${_LIB_PATH_STEM}")
+ set(
+ cxx_bridge_binary_folder
+ ${CMAKE_BINARY_DIR}/cargo/build/${RUST_cargo_target}/cxxbridge)
+ set(
+ common_header
+ ${cxx_bridge_binary_folder}/rust/cxx.h)
+ set(
+ binding_header
+ ${cxx_bridge_binary_folder}/${_LIB_PATH_STEM}/${cxx_bridge_source_file}.h)
+ set(
+ binding_source
+ ${cxx_bridge_binary_folder}/${_LIB_PATH_STEM}/${cxx_bridge_source_file}.cc)
+ set(
+ cxx_binding_include_dir
+ ${cxx_bridge_binary_folder})
+
+ # Create cxxbridge target
+ add_custom_command(
+ OUTPUT
+ ${common_header}
+ ${binding_header}
+ ${binding_source}
+ COMMAND
+ DEPENDS ${_LIB_PATH_STEM}-static
+ COMMENT "Fixing cmake to find source files"
+ )
+
+ add_library(${_LIB_PATH_STEM}_cxxbridge)
+ target_sources(${_LIB_PATH_STEM}_cxxbridge
+ PUBLIC
+ ${common_header}
+ ${binding_header}
+ ${binding_source}
+ )
+ target_include_directories(${_LIB_PATH_STEM}_cxxbridge
+ PUBLIC ${cxx_binding_include_dir}
+ )
+
+ # Create total target with alias with given namespace
+ add_library(${_LIB_PATH_STEM}-total INTERFACE)
+ target_link_libraries(${_LIB_PATH_STEM}-total
+ INTERFACE
+ ${_LIB_PATH_STEM}_cxxbridge
+ ${_LIB_PATH_STEM}
+ )
+
+ # for end-user to link into project
+ add_library(${namespace}::${_LIB_PATH_STEM} ALIAS ${_LIB_PATH_STEM}-total)
+endfunction(add_library_rust)
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D4805: [services] Add CMake file with functions for Corrosion and CXX integration
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