macosx extern inline problem

[Torbjorn Granlund]

I am afraid I don't think supporting all Xcode versions in GMP is
viable.  Apple's quality control leaves a lot to be desired, and if we
tried to implement workarounds for every Apple problem, then we would
make GMP more complex and harder to maintain.

Fortunately, several Xcode versions can be used for compiling GMP.

See also http://gmplib.org/macos.html for information about some Xcode
quality problems.

-- 
Torbjörn