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* Makefile.in (DLL_OFILES): Add new fenv.o module.
(fenv_CFLAGS): New flags definition for fenv.o compile.
* autoload.cc (std_dll_init): Use fenv.h functions instead of direct
manipulation of x87 FPU registers.
* crt0.c (mainCRTStartup): Likewise.
* cygwin.din (feclearexcept, fegetexceptflag, feraiseexcept,
fesetexceptflag, fetestexcept, fegetround, fesetround, fegetenv,
feholdexcept, fesetenv, feupdateenv, fegetprec, fesetprec,
feenableexcept, fedisableexcept, fegetexcept, _feinitialise,
_fe_dfl_env, _fe_nomask_env): Export new functions and data items.
* fenv.cc: New file.
* posix.sgml: Update status of newly-implemented APIs.
* include/fenv.h: Likewise related header.
* include/cygwin/version.h (CYGWIN_VERSION_API_MINOR): Bump.
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