# GCC 16 toolchain for C++26 and contracts.
find_program(
    COURSE_GCC16_C
    NAMES gcc-16
    HINTS /opt/homebrew/bin /usr/local/bin /opt/local/bin
)
find_program(
    COURSE_GCC16_CXX
    NAMES g++-16
    HINTS /opt/homebrew/bin /usr/local/bin /opt/local/bin
)

if(NOT COURSE_GCC16_CXX)
    message(
        FATAL_ERROR
        "g++-16 not found. Install GCC 16, e.g. 'brew install gcc@16', "
        "then ensure g++-16 is on your PATH."
    )
endif()

set(CMAKE_C_COMPILER "${COURSE_GCC16_C}" CACHE FILEPATH "C compiler" FORCE)
set(CMAKE_CXX_COMPILER "${COURSE_GCC16_CXX}" CACHE FILEPATH "C++ compiler" FORCE)