cmake/riscv_baremetal.cmake

set(SHODAN_TOOLCHAIN_PATH ${CMAKE_CURRENT_SOURCE_DIR}/../../cache/toolchain_vp/bin CACHE STRING "Shodan toolchain path")
message (STATUS "Shodan toolchain path is ${SHODAN_TOOLCHAIN_PATH}")
find_file( RISCV_GCC_COMPILER "riscv32-unknown-elf-gcc" HINTS ${SHODAN_TOOLCHAIN_PATH} PATHS ENV INCLUDE)

# Check compiler found
if (EXISTS ${RISCV_GCC_COMPILER})
message(STATUS "RISC-V GCC found. Using ${RISCV_GCC_COMPILER}")
else()
message(FATAL_ERROR "RISC-V GCC not found. ${RISCV_GCC_COMPILER}")
endif()

get_filename_component(RISCV_TOOLCHAIN_BIN_PATH ${RISCV_GCC_COMPILER} DIRECTORY)
get_filename_component(RISCV_TOOLCHAIN_BIN_GCC ${RISCV_GCC_COMPILER} NAME_WE)
get_filename_component(RISCV_TOOLCHAIN_BIN_EXT ${RISCV_GCC_COMPILER} EXT)

message( "RISC-V GCC Path: ${RISCV_TOOLCHAIN_BIN_PATH}" )

STRING(REGEX REPLACE "\-gcc" "-" CROSS_COMPILE ${RISCV_GCC_COMPILER})
message( "RISC-V Cross Compile Prefix: ${CROSS_COMPILE}" )

set( CMAKE_SYSTEM_NAME          Generic )
set( CMAKE_SYSTEM_PROCESSOR     rv32imv )
set( CMAKE_SYSTEM_ABI           ilp32 )
set( CMAKE_EXECUTABLE_SUFFIX    ".elf")

set(CMAKE_AR ${CROSS_COMPILE}ar)
set(CMAKE_ASM_COMPILER ${RISCV_GCC_COMPILER})
set(CMAKE_C_COMPILER ${RISCV_GCC_COMPILER})
set(CMAKE_CXX_COMPILER ${CROSS_COMPILE}g++)

set( CMAKE_OBJCOPY      ${RISCV_TOOLCHAIN_BIN_PATH}/${CROSS_COMPILE}objcopy
     CACHE FILEPATH "The toolchain objcopy command " FORCE )

set( CMAKE_OBJDUMP      ${RISCV_TOOLCHAIN_BIN_PATH}/${CROSS_COMPILE}objdump
     CACHE FILEPATH "The toolchain objdump command " FORCE )

set( CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -march=${CMAKE_SYSTEM_PROCESSOR}  -mabi=${CMAKE_SYSTEM_ABI}")

set( CMAKE_C_FLAGS "${CMAKE_C_FLAGS}" CACHE STRING "" )
set( CMAKE_CXX_FLAGS "${CMAKE_C_FLAGS}" CACHE STRING "" )
set( CMAKE_ASM_FLAGS "${CMAKE_C_FLAGS}" CACHE STRING "" )
set( CMAKE_EXE_LINKER_FLAGS   "${CMAKE_EXE_LINKER_FLAGS}  -nostartfiles   " )
set( VEC_DEFAULT_COPTS
    "-Wall"
    "-Werror"
    "-O0"
    "-g3"
    "-ggdb"
    "-ffreestanding"
    "-ffunction-sections"
    "-fstack-usage"
    "-mstrict-align"
)

set( VEC_DEFAULT_LINKOPTS -specs=nano.specs -Wl,--gc-sections -Wl,--print-memory-usage -Wl,-Map=${PROJECT_NAME}.map)