inline asm and multi-alternative constraints

[David Wohlferd]

Does gcc's inline asm support multi-alternative constraints?  Or are 
they only supported for md?

The fact that it is doc'ed with the other constraints 
(https://gcc.gnu.org/onlinedocs/gcc/Constraints.html) says it works for 
inline.  But https://gcc.gnu.org/bugzilla/show_bug.cgi?id=10396#c17 says 
it only works for md.

I've got a patch ready to remove this section from the non-md docs 
(attached).  But there probably needs to be more support than a 11 year 
old comment to approve it.

Dropping a supported feature is always controversial.  But if it doesn't 
work, perhaps less so.  After all, doc'ing something that doesn't work 
is just as bad.

dw

PS If it *is* supported, then the docs need some work.
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