#set(CMAKE_TRY_COMPILE_TARGET_TYPE STATIC_LIBRARY)
# Object build options
# -O0                   No optimizations, reduce compilation time and make debugging produce the expected results.
# -fno-builtin          Do not use built-in functions provided by GCC.
# -Wall                 Print only standard warnings, for all use Wextra
# -ffunction-sections   Place each function item into its own section in the output file.
# -fdata-sections       Place each data item into its own section in the output file.
# -fomit-frame-pointer  Omit the frame pointer in functions that don’t need one.
# -Og   Enables optimizations that do not interfere with debugging.
# -g    Produce debugging information in the operating system’s native format.
# -Os   Optimize for size. -Os enables all -O2 optimizations.
# -flto Runs the standard link-time optimizer.
SET(MCPU "riscv-e24")
if(${SUPPORT_FLOAT} STREQUAL "y")
SET(MARCH "rv32imafc")
SET(MABI "ilp32f")
else()
SET(MARCH "rv32imac")
SET(MABI "ilp32")
endif()
SET(MCU_FLAG "-march=${MARCH} -mabi=${MABI}")

SET(COMMON_FLAGS "-Os -g3 -fshort-enums -fno-common \
-fms-extensions -ffunction-sections -fdata-sections -fstrict-volatile-bitfields \
-Wall -Wshift-negative-value -Wchar-subscripts -Wformat -Wuninitialized -Winit-self \
-Wignored-qualifiers -Wunused -Wundef -msmall-data-limit=4")
				 
# compiler: language specific flags
set(CMAKE_C_FLAGS "${MCU_FLAG} ${COMMON_FLAGS} -std=c99"  CACHE INTERNAL "c compiler flags")
set(CMAKE_C_FLAGS_DEBUG "-Og -g" CACHE INTERNAL "c compiler flags: Debug")
set(CMAKE_C_FLAGS_RELEASE "-Os" CACHE INTERNAL "c compiler flags: Release")

# message("")
# message("-----------------------------------------------------------------------------------------------------------------------------------------------------")
# message("Setting C compiler")
# message("C compiler flags options:   ${CMAKE_C_FLAGS}")
# message("C compiler debug options: ${CMAKE_C_FLAGS_DEBUG}")
# message("C compiler release options: ${CMAKE_C_FLAGS_RELEASE}")
# message("-----------------------------------------------------------------------------------------------------------------------------------------------------")


set(CMAKE_CXX_FLAGS "${MCU_FLAG} ${COMMON_FLAGS} -std=c++11 " CACHE INTERNAL "cxx compiler flags")
set(CMAKE_CXX_FLAGS_DEBUG "-Og -g" CACHE INTERNAL "cxx compiler flags: Debug")
set(CMAKE_CXX_FLAGS_RELEASE "-Os" CACHE INTERNAL "cxx compiler flags: Release")

# message("")
# message("-----------------------------------------------------------------------------------------------------------------------------------------------------")
# message("Setting C++ compiler")
# message("C++ compiler flags options:   ${CMAKE_CXX_FLAGS}")
# message("C++ compiler debug options: ${CMAKE_CXX_FLAGS_DEBUG}")
# message("C++ compiler release options: ${CMAKE_CXX_FLAGS_RELEASE}")
# message("-----------------------------------------------------------------------------------------------------------------------------------------------------")


set(CMAKE_ASM_FLAGS  "${MCU_FLAG} ${COMMON_FLAGS}" CACHE INTERNAL "asm compiler flags")
set(CMAKE_ASM_FLAGS_DEBUG "-Og -g" CACHE INTERNAL "asm compiler flags: Debug")
set(CMAKE_ASM_FLAGS_RELEASE "-Os" CACHE INTERNAL "asm compiler flags: Release")

# message("")
# message("-----------------------------------------------------------------------------------------------------------------------------------------------------")
# message("Setting ASM compiler")
# message("ASM compiler flags options:   ${CMAKE_ASM_FLAGS}")
# message("ASM compiler debug options: ${CMAKE_ASM_FLAGS_DEBUG}")
# message("ASM compiler release options: ${CMAKE_ASM_FLAGS_RELEASE}")
# message("-----------------------------------------------------------------------------------------------------------------------------------------------------")

# -Wl,--gc-sections     Perform the dead code elimination.
# --specs=nano.specs    Link with newlib-nano.
# --specs=nosys.specs   No syscalls, provide empty implementations for the POSIX system calls.

if(${SUPPORT_FLOAT} STREQUAL "y")
add_definitions(-DBFLB_PRINT_FLOAT_SUPPORT)
else()
endif()

if(${SUPPORT_SHELL} STREQUAL "y")
add_definitions(-DSHELL_SUPPORT)
else()
endif()

if(${BOARD} MATCHES "(bl602u.*)")
set(mcu bl602u)

elseif(${BOARD} MATCHES "(bl602).*")
set(mcu bl602)

elseif(${BOARD} MATCHES "(bl702|bl704|bl706).*")
set(mcu bl702)

elseif(${BOARD} MATCHES "(bl606p).*")
set(mcu bl606p)

else()
endif()

SET(LINKER_SCRIPT ${CMAKE_SOURCE_DIR}/drivers/${mcu}_driver/${mcu}_flash.ld)

set(CMAKE_EXE_LINKER_FLAGS "${MCU_FLAG} -Wl,--cref -Wl,--gc-sections -nostartfiles -lc -lm -g3  \
-fms-extensions -ffunction-sections -fdata-sections -Wall -Wchar-subscripts \
-Wformat -Wuninitialized -Winit-self -Wignored-qualifiers -Wswitch-default -Wunused -Wundef -std=c99" CACHE INTERNAL "Linker options")