CMakeLists.txt

# SPDX-FileCopyrightText: 2025 Verizon
# SPDX-License-Identifier: Apache-2.0

# Set flags for compiling the binary
set(ASN1_DEFINITIONS 
    ASN_DISABLE_PRINT_SUPPORT 
    ASN_PDU_COLLECTION
)

# Reference cmake files for custom functions
list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake")
include(PostBuild)

# Grab all of the sources 
set(VERSION_DIR "${CMAKE_CURRENT_SOURCE_DIR}/${J2735_REV}")
# Check if the standard version directory exists
if(NOT EXISTS "${VERSION_DIR}")
    message(FATAL_ERROR 
        "Missing standard directory: ${VERSION_DIR}\n"
        "Please ensure the SAE J2735 ${J2735_REV} files are present."
    )
endif()
file(GLOB ASN1_SOURCES "${VERSION_DIR}/src/*.c")
# Final check: Did we actually find any code?
if(NOT ASN1_SOURCES)
    message(FATAL_ERROR "Directory found, but no .c files found in: ${VERSION_DIR}/src")
endif()

# Build out the native library if specified
if(BUILD_NATIVE_LIB)
    file(MAKE_DIRECTORY "${DIST_STATIC_DIR}")
    add_library(j2735_native_lib STATIC)
    target_sources(j2735_native_lib PRIVATE ${ASN1_SOURCES})
    target_include_directories(j2735_native_lib 
        PUBLIC "${VERSION_DIR}/include"
    )
    target_compile_definitions(j2735_native_lib PRIVATE ${ASN1_DEFINITIONS})
    set_target_properties(j2735_native_lib PROPERTIES 
        ARCHIVE_OUTPUT_DIRECTORY "${DIST_STATIC_DIR}"
        OUTPUT_NAME "j2735codec"
    )
endif()

# Build out WASM if activated by emscripten
if(EMSCRIPTEN)
    # Setup for compilation
    add_executable(j2735_wasm_lib)
    target_sources(j2735_wasm_lib PRIVATE ${ASN1_SOURCES})
    target_include_directories(j2735_wasm_lib 
        PUBLIC "${VERSION_DIR}/include"
    )
    target_compile_definitions(j2735_wasm_lib PRIVATE ${ASN1_DEFINITIONS})

    # Need link options for WASM build
    target_link_options(j2735_wasm_lib PRIVATE
        "-sSTANDALONE_WASM" 
        "-sEXPORTED_FUNCTIONS=['_transcode','_malloc','_free']"
        "-Wl,--no-entry"
    )

    # Setup output properties
    set_target_properties(j2735_wasm_lib PROPERTIES 
        RUNTIME_OUTPUT_DIRECTORY "${DIST_WASM_DIR}"
        OUTPUT_NAME "j2735codec"
        SUFFIX ".wasm"
    )

    # Perform post build actions, build dist directory
    add_custom_command(TARGET j2735_wasm_lib POST_BUILD
        COMMAND ${CMAKE_COMMAND} -E make_directory "${DIST_WASM_DIR}"
        COMMENT "Constructing WASM asset directory ${DIST_WASM_DIR}..."
        VERBATIM
    )

    # Build binding outputs
    foreach(DIR ${PY_DIR} ${NODE_DIR})
        # Create directories for each binding
        set(GEN_DIR "${DIR}/generated")
        create_binding_directories(j2735_wasm_lib ${GEN_DIR})

        set(EXT ".py")
        if(${DIR} STREQUAL ${NODE_DIR})
            set(EXT ".ts")
        endif()

        # Generate enums for python binding
        generate_enums(
            j2735_wasm_lib 
            "${VERSION_DIR}/src/pdu_collection.c" 
            "${GEN_DIR}/pdu${EXT}" 
            "&asn_DEF_"
            "PDUTypes"
        )
        generate_enums(
            j2735_wasm_lib 
            "${VERSION_DIR}/include/asn_application.h" 
            "${GEN_DIR}/encodings${EXT}" 
            "ATS_"
            "EncodingRules"
        )
    endforeach()
endif()