Re: Xcode 12 problem with detectArmFeatures (cryptopp 8.5)

On Tue, May 11, 2021 at 8:15 AM Nelson João <[email protected]> wrote:
>
> I have some problems when I try to compile cryptopp inside my app using the cryptopp version 8.5 and XCode 12.
> If I try using the older Xcode (11.4), I don't have a problem, but after update the Xcode, I have some undefined methods:
> CPU_ProbeARMv7();
> CPU_ProbeNEON();
> CPU_ProbePMULL();
> CPU_ProbeAES();
> CPU_ProbeSHA1();
> CPU_ProbeSHA256();
>
> Exist some preprocessor to disable these methods?

On Apple platforms we don't perform CPU probes. A CPU probe is where
we setup a SIGILL handler and try an instruction. If there's a SIGILL
then we know the instruction is not available. On Apple platforms,
memory gets corrupted when a SIGILL is encountered. We are not sure
why. (OpenSSL and Botan stopped doing them, too).

The define you are looking for is CRYPTOPP_NO_CPU_FEATURE_PROBES. It
is usually set automatically in config_cpu.h.
https://github.com/weidai11/cryptopp/blob/master/config_cpu.h#L180.

Jeff

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