# Use Ninja instead of Unix Makefiles by default.
# https://stackoverflow.com/questions/11269833/cmake-selecting-a-generator-within-cmakelists-txt
#
# Reason: it has better startup time than make and it parallelizes jobs more uniformly.
# (when comparing to make with Makefiles that was generated by CMake)
#
# How to install Ninja on Ubuntu:
#  sudo apt-get install ninja-build

# CLion does not support Ninja
# You can add your vote on CLion task tracker:
# https://youtrack.jetbrains.com/issue/CPP-2659
# https://youtrack.jetbrains.com/issue/CPP-870

if (NOT DEFINED ENV{CLION_IDE} AND NOT DEFINED ENV{XCODE_IDE})
    find_program(NINJA_PATH ninja)
    if (NINJA_PATH)
        set(CMAKE_GENERATOR "Ninja" CACHE INTERNAL "" FORCE)
    endif ()
endif()


# Default toolchain - this is needed to avoid dependency on OS files.
execute_process(COMMAND uname -s OUTPUT_VARIABLE OS)
execute_process(COMMAND uname -m OUTPUT_VARIABLE ARCH)

if (OS MATCHES "Linux"
    AND NOT DEFINED CMAKE_TOOLCHAIN_FILE
    AND NOT DISABLE_HERMETIC_BUILD
    AND ($ENV{CC} MATCHES ".*clang.*" OR CMAKE_C_COMPILER MATCHES ".*clang.*"))

    if (ARCH MATCHES "amd64|x86_64")
        set (CMAKE_TOOLCHAIN_FILE "cmake/linux/toolchain-x86_64.cmake" CACHE INTERNAL "" FORCE)
    elseif (ARCH MATCHES "^(aarch64.*|AARCH64.*|arm64.*|ARM64.*)")
        set (CMAKE_TOOLCHAIN_FILE "cmake/linux/toolchain-aarch64.cmake" CACHE INTERNAL "" FORCE)
    elseif (ARCH MATCHES "^(ppc64le.*|PPC64LE.*)")
        set (CMAKE_TOOLCHAIN_FILE "cmake/linux/toolchain-ppc64le.cmake" CACHE INTERNAL "" FORCE)
    else ()
        message (FATAL_ERROR "Unsupported architecture: ${ARCH}")
    endif ()

endif()