Also enclose variable names with external linkage in __BEGIN_DECLS.

Doesn't matter much since C++ ABI used by GCC doesn't mangle variable
names; however technically is required by Section 7.5 of th

Also enclose variable names with external linkage in __BEGIN_DECLS.

Doesn't matter much since C++ ABI used by GCC doesn't mangle variable
names; however technically is required by Section 7.5 of the C++ spec.

Discussed with/OK guenther@, matthew@.

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fenv improvements and cleanups

Implement C99 floating-point environment for Alpha.

Delivering FPE with non-masked exceptions doesn't work on Alpha; I
suspect there's a bug in the kernel trap handler.

FE_INEXACT is intentionally

Implement C99 floating-point environment for Alpha.

Delivering FPE with non-masked exceptions doesn't work on Alpha; I
suspect there's a bug in the kernel trap handler.

FE_INEXACT is intentionally left out of FE_ALL_EXCEPT; since the
inexact exception is not being maintained. Otherwise it will lead
to the bogus results.

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