To disable (or not) assembler modules?

[Tabitha McNerney]

Hello all -

I noticed that some ports use the configure option:

--disable-asm

I looked up what this means and found in some ReadMe files of the source
distribution of, for example, libgcrypt:

*Do not use assembler modules.  It is not possible to use this on some CPU
> types.*


Are there any general rules as to why assembler modules should in fact be
disabled on, say, PowerPC or Intel based Apple machines?

Thanks to anyone who may be more in the know.

-Tabitha
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