deskhop/pico-sdk/cmake/preload/toolchains/set_flags.cmake

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get_property(IS_IN_TRY_COMPILE GLOBAL PROPERTY IN_TRY_COMPILE)
foreach(LANG IN ITEMS C CXX ASM)
set(CMAKE_${LANG}_FLAGS_INIT "${ARM_TOOLCHAIN_COMMON_FLAGS}")
if (PICO_DEOPTIMIZED_DEBUG)
set(CMAKE_${LANG}_FLAGS_DEBUG_INIT "-O0")
else()
set(CMAKE_${LANG}_FLAGS_DEBUG_INIT "-Og")
endif()
set(CMAKE_${LANG}_LINK_FLAGS "-Wl,--build-id=none")
# try_compile is where the feature testing is done, and at that point,
# pico_standard_link is not ready to be linked in to provide essential
# functions like _exit. So pass -nostdlib so it doesn't link in an exit()
# function at all.
if(IS_IN_TRY_COMPILE)
set(CMAKE_${LANG}_LINK_FLAGS "${CMAKE_${LANG}_LINK_FLAGS} -nostdlib")
endif()
endforeach()