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https://github.com/logos-messaging/nim-ffi.git
synced 2026-07-19 14:29:26 +00:00
73 lines
2.4 KiB
CMake
73 lines
2.4 KiB
CMake
cmake_minimum_required(VERSION 3.14)
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project(echo_c_abi_bindings C)
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set(CMAKE_C_STANDARD 11)
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set(CMAKE_C_STANDARD_REQUIRED ON)
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# The CBOR-free `abi = c` binding links no TinyCBOR — the flat structs in the
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# generated header are the ABI. Only the Nim dylib is built.
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set(_search_dir "${CMAKE_CURRENT_SOURCE_DIR}")
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set(REPO_ROOT "")
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foreach(_i RANGE 10)
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if(EXISTS "${_search_dir}/ffi.nimble")
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set(REPO_ROOT "${_search_dir}")
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break()
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endif()
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get_filename_component(_search_dir "${_search_dir}" DIRECTORY)
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endforeach()
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if("${REPO_ROOT}" STREQUAL "")
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message(FATAL_ERROR "Cannot find repo root (no ffi.nimble in any ancestor)")
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endif()
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# Extra `nim c` arguments (e.g. a `-d:` that flips a shared example source to
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# `abi = c`). A library that declares `defaultABIFormat = "c"` needs none.
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set(NIM_FFI_EXTRA_ARGS "" CACHE STRING "Extra nim c args when building the dylib")
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find_program(NIM_EXECUTABLE nim REQUIRED)
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if(CMAKE_SYSTEM_NAME STREQUAL "Darwin")
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set(NIM_LIB_FILE "${REPO_ROOT}/libecho.dylib")
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elseif(CMAKE_SYSTEM_NAME STREQUAL "Windows")
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set(NIM_LIB_FILE "${REPO_ROOT}/echo.dll")
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else()
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set(NIM_LIB_FILE "${REPO_ROOT}/libecho.so")
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endif()
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get_filename_component(NIM_SRC "${CMAKE_CURRENT_SOURCE_DIR}/../echo.nim" ABSOLUTE)
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add_custom_command(
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OUTPUT "${NIM_LIB_FILE}"
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COMMAND "${NIM_EXECUTABLE}" c
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--mm:orc
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-d:chronicles_log_level=WARN
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--app:lib
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--noMain
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"--nimMainPrefix:libecho"
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${NIM_FFI_EXTRA_ARGS}
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"-o:${NIM_LIB_FILE}"
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"${NIM_SRC}"
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WORKING_DIRECTORY "${REPO_ROOT}"
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DEPENDS "${NIM_SRC}"
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COMMENT "Compiling Nim library libecho (abi = c)"
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VERBATIM
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)
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add_custom_target(echo_nim_lib ALL DEPENDS "${NIM_LIB_FILE}")
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add_library(echo SHARED IMPORTED GLOBAL)
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set_target_properties(echo PROPERTIES IMPORTED_LOCATION "${NIM_LIB_FILE}")
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add_dependencies(echo echo_nim_lib)
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find_package(Threads REQUIRED)
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add_library(echo_headers INTERFACE)
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target_include_directories(echo_headers INTERFACE "${CMAKE_CURRENT_SOURCE_DIR}")
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target_link_libraries(echo_headers INTERFACE echo Threads::Threads)
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target_compile_definitions(echo_headers INTERFACE _POSIX_C_SOURCE=200809L)
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if(EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/main.c")
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add_executable(echo_example main.c)
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target_link_libraries(echo_example PRIVATE echo_headers)
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add_dependencies(echo_example echo_nim_lib)
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endif()
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