SET(CMAKE_SYSTEM_NAME Linux)
SET(CMAKE_SYSTEM_PROCESSOR aarch64)

# Toolchain precedence: environment variable TROUT_CLANG_PATH > LV Clang Toolchain
# AGL sysroot precedence: environment variable TROUT_AGL_SYSROOT > LV AGL sysroot
IF(DEFINED ENV{LV_BUILD_PATH})
    SET(TROUT_CLANG_PATH $ENV{LV_BUILD_PATH}/tmp-glibc/sysroots-components/x86_64/clang-native)
    SET(TROUT_AGL_SYSROOT $ENV{LV_BUILD_PATH}/tmp-glibc/sysroots/opsy-sa8155/)
ENDIF()

IF (DEFINED ENV{TROUT_CLANG_PATH})
    SET(TROUT_CLANG_PATH $ENV{TROUT_CLANG_PATH})
ENDIF()

IF (DEFINED ENV{TROUT_AGL_SYSROOT})
    SET(TROUT_AGL_SYSROOT $ENV{TROUT_AGL_SYSROOT})
ENDIF()

IF (NOT TROUT_CLANG_PATH)
    MESSAGE(FATAL_ERROR "Please run `lunch`, or define environment variable LV_BUILD_PATH or TROUT_CLANG_PATH")
ENDIF()

IF (NOT TROUT_AGL_SYSROOT)
    MESSAGE(FATAL_ERROR "Please define environment variable LV_BUILD_PATH or TROUT_AGL_SYSROOT")
ENDIF()

SET(_triple aarch64-none-linux-gnu)

SET(CMAKE_CROSSCOMPILING TRUE)
SET(CMAKE_SYSROOT ${TROUT_AGL_SYSROOT})

SET(CMAKE_C_COMPILER ${TROUT_CLANG_PATH}/usr/bin/clang)
SET(CMAKE_C_COMPILER_TARGET ${_triple})

SET(CMAKE_CXX_COMPILER ${TROUT_CLANG_PATH}/usr/bin/clang++)
SET(CMAKE_CXX_COMPILER_TARGET ${_triple})

SET(CMAKE_ASM_COMPILER_TARGET ${_triple})

SET(CMAKE_AR ${TROUT_CLANG_PATH}/usr/bin/llvm-ar)
SET(CMAKE_NM ${TROUT_CLANG_PATH}/usr/bin/llvm-nm)
SET(CMAKE_RANLIB ${TROUT_CLANG_PATH}/usr/bin/llvm-ranlib)

SET(CMAKE_CXX_STANDARD_INCLUDE_DIRECTORIES
    ${TROUT_AGL_SYSROOT}/usr/include/c++/9.3.0
    ${TROUT_AGL_SYSROOT}/usr/include/c++/9.3.0/aarch64-oe-linux
)

SET(CMAKE_EXE_LINKER_FLAGS
    -fuse-ld=lld
    -B ${TROUT_AGL_SYSROOT}/usr/lib/aarch64-oe-linux/9.3.0
    -nodefaultlibs
    -lstdc++
    -lm
    -lc
    -lgcc_s
)
STRING(REPLACE ";" " " CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS}")

SET(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
SET(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
SET(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
SET(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)