tinyusb/examples/build_system/cmake/cpu/rv32imac-ilp32.cmake

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CMake
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if (TOOLCHAIN STREQUAL "gcc")
set(TOOLCHAIN_COMMON_FLAGS
-march=rv32imac_zicsr
-mabi=ilp32
)
set(FREERTOS_PORT GCC_RISC_V CACHE INTERNAL "")
elseif (TOOLCHAIN STREQUAL "clang")
set(TOOLCHAIN_COMMON_FLAGS
-march=rv32imac_zicsr
-mabi=ilp32
)
set(FREERTOS_PORT GCC_RISC_V CACHE INTERNAL "")
elseif (TOOLCHAIN STREQUAL "iar")
message(FATAL_ERROR "IAR not supported")
set(FREERTOS_PORT IAR_RISC_V CACHE INTERNAL "")
endif ()