Why do I encounter a compilation error about unidentified "__bf16" from arm_neon when using polyspace-configure in MATLAB R2025a?

I am trying to complete a Polyspace Bug Finder analysis on my project using "polyspace-configure" at the command line. My project fails to compile due to many instances of the following error:

/usr/local/Polyspace/R2025a/polyspace/verifier/extensions/tmw_builtins/tmw_builtin_types_arm_neon32.h, line 13: error: identifier "__bf16" is undefined

| typedef __attribute__((neon_vector_type(8))) __bf16 __simd128_bfloat16_t;
Why does this error occur, and how can I work around it in MATLAB R2025a?

Answer 1

[MathWorks Support Team]

This is a result of an unidentified __bf16 data type. To resolve this, the macro __bf16 must be defined as an unsigned short. This can be done by including the following option when you run the Polyspace analysis:

-D__bf16="unsigned short"

An alternative solution that would include all half float types would be to add these Polyspace options:

-cfe-extra-flags --half_float_types

In the case that other compilation errors are a consequence of this one, they may also be resolved with this workaround.