smartbotic-microbit/cmake/CompilerFlags.cmake

# Smartbotic-MicroBit Compiler Flags

# Common warnings for all builds
add_compile_options(
    -Wall
    -Wextra
    -Wpedantic
    -Werror=return-type
    -Werror=unused-result
    -Wno-unused-parameter
)

# Debug flags
if(CMAKE_BUILD_TYPE STREQUAL "Debug")
    add_compile_options(
        -g3
        -O0
        -fno-omit-frame-pointer
    )

    option(ENABLE_SANITIZERS "Enable ASan and UBSan" OFF)
    if(ENABLE_SANITIZERS)
        add_compile_options(-fsanitize=address,undefined)
        add_link_options(-fsanitize=address,undefined)
    endif()
endif()

# Release flags
if(CMAKE_BUILD_TYPE STREQUAL "Release")
    add_compile_options(
        -O3
        -DNDEBUG
        -march=native
    )
endif()

# RelWithDebInfo flags
if(CMAKE_BUILD_TYPE STREQUAL "RelWithDebInfo")
    add_compile_options(
        -O2
        -g
        -DNDEBUG
    )
endif()

# LTO for release builds
if(CMAKE_BUILD_TYPE STREQUAL "Release" OR CMAKE_BUILD_TYPE STREQUAL "RelWithDebInfo")
    include(CheckIPOSupported)
    check_ipo_supported(RESULT IPO_SUPPORTED OUTPUT IPO_ERROR)
    if(IPO_SUPPORTED)
        message(STATUS "IPO/LTO enabled")
        set(CMAKE_INTERPROCEDURAL_OPTIMIZATION ON)
    else()
        message(STATUS "IPO/LTO not supported: ${IPO_ERROR}")
    endif()
endif()

# Position independent code
set(CMAKE_POSITION_INDEPENDENT_CODE ON)