__AAPCS_VFP__
In this section:
Description
An integer that is set based on the compiler option ‑‑aapcs. The symbol is set to 1 if the VFP variant of AAPCS is the selected calling convention (‑‑aapcs=vfp). The symbol is undefined for other calling conventions.
This preprocessor symbol is equivalent to the ACLE (Arm C Language Extensions) macro __ARM_PCS_VFP.