how to compile c code with cde functions(like __arm_cx1a) using gcc arm toolchain


   I am trying to compile a simple test C code which calls  a cde function __arm_cx1a.

   And always encountered with a ld error: undefined reference to '__builtin_arm_cx1asi'

   The version of arm-none-eabi-gcc i am using is  10.2.1(GNU Arm Embedded Toolchain 10-2020-q4-major)

   The command is 

   arm-none-eabi-gcc -mcpu=cortex-m33 test.c -D__ARM_FEATURE_CDE --specs=nosys.specs -mthumb

   Anyone know how to work this out?


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