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Cygwin: fenv.h: Add feature test macros, fix values

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- feenableexcept,fedisableexcept, fegetexcept are GNU-only
- fegetprec, fesetprec are Solaris, use __MISC_VISIBLE
- _feinitialise is Cygwin-internal only
- Replace self-named FP precision values to values from
  http://www.open-std.org/jtc1/sc22//WG14/www/docs/n752.htm
  as used by Solaris.
- Change return value of fesetprec to adhere to the above document
  and Solaris.
- Document fegetprec, fesetprec as Solaris functions, not as GNU
  functions

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
This commit is contained in:
Corinna Vinschen
2019-02-28 15:05:13 +01:00
parent 166913fb23
commit 40958b0d86
3 changed files with 52 additions and 33 deletions
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55
winsup/cygwin/include/fenv.h
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@@ -106,11 +106,14 @@ typedef __uint32_t fexcept_t;
#define FE_TOWARDZERO (3)
#define FE_UPWARD (2)
/* Precision bit values. Not defined by Posix, but follow logically. */
#define FE_SINGLEPREC (0)
#define FE_RESERVEDPREC (1)
#define FE_DOUBLEPREC (2)
#define FE_EXTENDEDPREC (3)
/* Only Solaris and QNX implement fegetprec/fesetprec. As Solaris, use the
values defined by http://www.open-std.org/jtc1/sc22//WG14/www/docs/n752.htm
QNX defines different values. */
#if __MISC_VISIBLE
#define FE_FLTPREC (0)
#define FE_DBLPREC (2)
#define FE_LDBLPREC (3)
#endif
/* The <fenv.h> header shall define the following constant, which
represents the default floating-point environment (that is, the one
@@ -138,30 +141,34 @@ extern const fenv_t *_fe_nomask_env;
/* The following shall be declared as functions and may also be
defined as macros. Function prototypes shall be provided. */
extern int feclearexcept (int excepts);
extern int fegetexceptflag (fexcept_t *flagp, int excepts);
extern int feraiseexcept (int excepts);
extern int fesetexceptflag (const fexcept_t *flagp, int excepts);
extern int fetestexcept (int excepts);
extern int feclearexcept (int __excepts);
extern int fegetexceptflag (fexcept_t *__flagp, int __excepts);
extern int feraiseexcept (int __excepts);
extern int fesetexceptflag (const fexcept_t *__flagp, int __excepts);
extern int fetestexcept (int __excepts);
extern int fegetround (void);
extern int fesetround (int round);
extern int fegetenv (fenv_t *envp);
extern int feholdexcept (fenv_t *envp);
extern int fesetenv (const fenv_t *envp);
extern int feupdateenv (const fenv_t *envp);
/* These are not defined in Posix, but make sense by obvious extension. */
extern int fegetprec (void);
extern int fesetprec (int prec);
/* This is Cygwin-custom, not from the standard, for use in the Cygwin CRT. */
extern void _feinitialise (void);
extern int fesetround (int __round);
extern int fegetenv (fenv_t *__envp);
extern int feholdexcept (fenv_t *__envp);
extern int fesetenv (const fenv_t *__envp);
extern int feupdateenv (const fenv_t *__envp);
#if __GNU_VISIBLE
/* These are GNU extensions defined in glibc. */
extern int feenableexcept (int excepts);
extern int fedisableexcept (int excepts);
extern int feenableexcept (int __excepts);
extern int fedisableexcept (int __excepts);
extern int fegetexcept (void);
#endif
#if __MISC_VISIBLE
extern int fegetprec (void);
extern int fesetprec (int __prec);
#endif
#ifdef __INSIDE_CYGWIN__
/* This is Cygwin-custom, not from the standard, for use in the Cygwin CRT. */
extern void _feinitialise ();
#endif
#ifdef __cplusplus
}