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enable fixed point

Category: Software
Product Number: sc594
Software Version: yocto v3.0.0

For yocto v2.1.0  I could enable fixed point by modifying the file shown here
meta-arm/meta-arm-toolchain/recipes-devtools/gcc/gcc-cross-canadian_arm-9.2.bb
recipes-devtools/gcc/gcc-cross-canadian.inc add
-  GCCMULTILIB = "--enable-multilib"
+ GCCMULTILIB = "--enable-multilib --enable-fixed-point"

In yocto 3.0.0 the equivalent files is not used
meta-arm-toolchain/recipes-devtools/gcc/gcc-cross-canadian-aarch64.bb

How do I enable fixed point in v3.0.0 gcc compiler ?

Chris