feat(codegen): C binding generator (-d:targetLang=c) (#102)

examples/timer/cpp_bindings/CMakeLists.txt

@@ -27,92 +27,10 @@ if("${REPO_ROOT}" STREQUAL "")
     message(FATAL_ERROR "Cannot find repo root (no ffi.nimble in any ancestor)")
 endif()
 
-get_filename_component(NIM_SRC
-    "${CMAKE_CURRENT_SOURCE_DIR}/../timer.nim"
-    ABSOLUTE)
-
-find_program(NIM_EXECUTABLE nim REQUIRED)
-
-if(CMAKE_SYSTEM_NAME STREQUAL "Darwin")
-    set(NIM_LIB_FILE "${REPO_ROOT}/libmy_timer.dylib")
-elseif(CMAKE_SYSTEM_NAME STREQUAL "Windows")
-    set(NIM_LIB_FILE "${REPO_ROOT}/my_timer.dll")
-    # MSVC consumers link against the `.lib` import library, not the DLL.
-    # MinGW's ld emits one when asked via `--out-implib`; the resulting COFF
-    # archive is readable by MSVC's link.exe.
-    set(NIM_IMPLIB_FILE "${REPO_ROOT}/my_timer.lib")
-else()
-    set(NIM_LIB_FILE "${REPO_ROOT}/libmy_timer.so")
-endif()
-
-# On Windows the default Nim toolchain (mingw gcc) doesn't emit an import
-# library unless told to. Without it, MSVC consumers can't resolve any
-# symbol exported by the DLL at link time.
-set(NIM_IMPLIB_PASSL "")
-if(CMAKE_SYSTEM_NAME STREQUAL "Windows")
-    set(NIM_IMPLIB_PASSL "--passL:-Wl,--out-implib,${NIM_IMPLIB_FILE}")
-endif()
-
-add_custom_command(
-    OUTPUT  "${NIM_LIB_FILE}"
-    COMMAND "${NIM_EXECUTABLE}" c
-                --mm:orc
-                -d:chronicles_log_level=WARN
-                --app:lib
-                --noMain
-                "--nimMainPrefix:libmy_timer"
-                ${NIM_IMPLIB_PASSL}
-                "-o:${NIM_LIB_FILE}"
-                "${NIM_SRC}"
-    WORKING_DIRECTORY "${REPO_ROOT}"
-    DEPENDS "${NIM_SRC}"
-    BYPRODUCTS "${NIM_IMPLIB_FILE}"
-    COMMENT "Compiling Nim library libmy_timer"
-    VERBATIM
-)
-add_custom_target(my_timer_nim_lib ALL DEPENDS "${NIM_LIB_FILE}")
-
-# On Windows, an `IMPORTED SHARED` target needs IMPORTED_IMPLIB pointing at
-# the `.lib` import library so MSVC's `link.exe` can resolve symbols. The
-# Visual Studio multi-config generator did not pick up `IMPORTED_IMPLIB` —
-# nor per-config `IMPORTED_IMPLIB_<CONFIG>` variants — and emitted
-# `my_timer-NOTFOUND.obj` into every link line. Side-step the IMPORTED
-# machinery on Windows by exposing the import library through a plain
-# INTERFACE library that links the `.lib` by path.
-if(CMAKE_SYSTEM_NAME STREQUAL "Windows")
-    add_library(my_timer INTERFACE)
-    target_link_libraries(my_timer INTERFACE "${NIM_IMPLIB_FILE}")
-else()
-    add_library(my_timer SHARED IMPORTED GLOBAL)
-    set_target_properties(my_timer PROPERTIES IMPORTED_LOCATION "${NIM_LIB_FILE}")
-endif()
-add_dependencies(my_timer my_timer_nim_lib)
-
-# Absolute path to the runtime library (DLL/dylib/so). Exposed via the cache
-# so consumers in other directories (e.g. tests/e2e/cpp) can stage the DLL
-# next to their executable on Windows.
-set(my_timer_RUNTIME_LIB "${NIM_LIB_FILE}" CACHE INTERNAL
-    "Absolute path to the my_timer runtime library")
-
-# ── TinyCBOR (vendored at ffi/codegen/templates/cpp/vendor/tinycbor) ─────────
-# Guarded so two sibling cpp_bindings dirs in one parent project don't redefine
-# the `tinycbor` target.
-set(TINYCBOR_SRC_DIR "${REPO_ROOT}/ffi/codegen/templates/cpp/vendor")
-if(NOT TARGET tinycbor)
-    add_library(tinycbor STATIC
-        "${TINYCBOR_SRC_DIR}/tinycbor/cborencoder.c"
-        "${TINYCBOR_SRC_DIR}/tinycbor/cborencoder_close_container_checked.c"
-        "${TINYCBOR_SRC_DIR}/tinycbor/cborparser.c"
-        "${TINYCBOR_SRC_DIR}/tinycbor/cborparser_dup_string.c"
-        "${TINYCBOR_SRC_DIR}/tinycbor/cborerrorstrings.c"
-    )
-    target_include_directories(tinycbor PUBLIC
-        "${TINYCBOR_SRC_DIR}"            # consumer uses #include <tinycbor/cbor.h>
-        "${TINYCBOR_SRC_DIR}/tinycbor"   # internal _p.h includes resolve here
-    )
-    set_property(TARGET tinycbor PROPERTY C_STANDARD 99)
-    set_property(TARGET tinycbor PROPERTY POSITION_INDEPENDENT_CODE ON)
-endif()
+# Build the Nim dylib + vendored TinyCBOR (shared with the C backend).
+set(NIM_FFI_LIB my_timer)
+set(NIM_FFI_SRC ../timer.nim)
+include("${REPO_ROOT}/ffi/codegen/templates/nim_ffi_lib.cmake")
 
 add_library(my_timer_headers INTERFACE)
 target_include_directories(my_timer_headers INTERFACE "${CMAKE_CURRENT_SOURCE_DIR}")