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libm: Control errno support with _IEEE_LIBM configuration parameter 

This removes the run-time configuration of errno support present in
portions of the math library and unifies all of the compile-time errno
configuration under a single parameter so that the whole library
is consistent.

The run-time support provided by _LIB_VERSION is no longer present in
the public API, although it is still used internally to disable errno
setting in some functions. Now that it is a constant, the compiler should
remove that code when errno is not supported.

This removes s_lib_ver.c as _LIB_VERSION is no longer variable.

Signed-off-by: Keith Packard <keithp@keithp.com>
This commit is contained in:
Keith Packard via Newlib 2020-08-04 15:22:24 -07:00 committed by Corinna Vinschen
parent e108d04432
commit c3ce8405c1
6 changed files with 22 additions and 73 deletions
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16
newlib/libc/include/math.h
View File

@ -612,22 +612,6 @@ extern int *__signgam (void);
#define M_LOG2_E _M_LN2
#define M_INVLN2 1.4426950408889633870E0 /* 1 / log(2) */
/* Global control over fdlibm error handling. */
enum __fdlibm_version
{
__fdlibm_ieee = -1,
__fdlibm_posix
};
#define _LIB_VERSION_TYPE enum __fdlibm_version
#define _LIB_VERSION __fdlib_version
extern __IMPORT _LIB_VERSION_TYPE _LIB_VERSION;
#define _IEEE_ __fdlibm_ieee
#define _POSIX_ __fdlibm_posix
#endif /* __BSD_VISIBLE */
_END_STD_C

2
newlib/libm/common/Makefile.am
View File

@ -8,7 +8,7 @@ src = s_finite.c s_copysign.c s_modf.c s_scalbn.c \
s_cbrt.c s_exp10.c s_expm1.c s_ilogb.c \
s_infinity.c s_isinf.c s_isinfd.c s_isnan.c s_isnand.c \
s_log1p.c s_nan.c s_nextafter.c s_pow10.c \
s_rint.c s_logb.c s_log2.c s_lib_ver.c \
s_rint.c s_logb.c s_log2.c \
s_fdim.c s_fma.c s_fmax.c s_fmin.c s_fpclassify.c \
s_lrint.c s_llrint.c \
s_lround.c s_llround.c s_nearbyint.c s_remquo.c s_round.c s_scalbln.c \

36
newlib/libm/common/Makefile.in
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@ -85,19 +85,19 @@ am__objects_1 = lib_a-s_finite.$(OBJEXT) lib_a-s_copysign.$(OBJEXT) \
lib_a-s_nan.$(OBJEXT) lib_a-s_nextafter.$(OBJEXT) \
lib_a-s_pow10.$(OBJEXT) lib_a-s_rint.$(OBJEXT) \
lib_a-s_logb.$(OBJEXT) lib_a-s_log2.$(OBJEXT) \
lib_a-s_lib_ver.$(OBJEXT) lib_a-s_fdim.$(OBJEXT) \
lib_a-s_fma.$(OBJEXT) lib_a-s_fmax.$(OBJEXT) \
lib_a-s_fmin.$(OBJEXT) lib_a-s_fpclassify.$(OBJEXT) \
lib_a-s_lrint.$(OBJEXT) lib_a-s_llrint.$(OBJEXT) \
lib_a-s_lround.$(OBJEXT) lib_a-s_llround.$(OBJEXT) \
lib_a-s_nearbyint.$(OBJEXT) lib_a-s_remquo.$(OBJEXT) \
lib_a-s_round.$(OBJEXT) lib_a-s_scalbln.$(OBJEXT) \
lib_a-s_signbit.$(OBJEXT) lib_a-s_trunc.$(OBJEXT) \
lib_a-exp.$(OBJEXT) lib_a-exp2.$(OBJEXT) \
lib_a-exp_data.$(OBJEXT) lib_a-math_err.$(OBJEXT) \
lib_a-log.$(OBJEXT) lib_a-log_data.$(OBJEXT) \
lib_a-log2.$(OBJEXT) lib_a-log2_data.$(OBJEXT) \
lib_a-pow.$(OBJEXT) lib_a-pow_log_data.$(OBJEXT)
lib_a-s_fdim.$(OBJEXT) lib_a-s_fma.$(OBJEXT) \
lib_a-s_fmax.$(OBJEXT) lib_a-s_fmin.$(OBJEXT) \
lib_a-s_fpclassify.$(OBJEXT) lib_a-s_lrint.$(OBJEXT) \
lib_a-s_llrint.$(OBJEXT) lib_a-s_lround.$(OBJEXT) \
lib_a-s_llround.$(OBJEXT) lib_a-s_nearbyint.$(OBJEXT) \
lib_a-s_remquo.$(OBJEXT) lib_a-s_round.$(OBJEXT) \
lib_a-s_scalbln.$(OBJEXT) lib_a-s_signbit.$(OBJEXT) \
lib_a-s_trunc.$(OBJEXT) lib_a-exp.$(OBJEXT) \
lib_a-exp2.$(OBJEXT) lib_a-exp_data.$(OBJEXT) \
lib_a-math_err.$(OBJEXT) lib_a-log.$(OBJEXT) \
lib_a-log_data.$(OBJEXT) lib_a-log2.$(OBJEXT) \
lib_a-log2_data.$(OBJEXT) lib_a-pow.$(OBJEXT) \
lib_a-pow_log_data.$(OBJEXT)
am__objects_2 = lib_a-sf_finite.$(OBJEXT) lib_a-sf_copysign.$(OBJEXT) \
lib_a-sf_modf.$(OBJEXT) lib_a-sf_scalbn.$(OBJEXT) \
lib_a-sf_cbrt.$(OBJEXT) lib_a-sf_exp10.$(OBJEXT) \
@ -163,7 +163,7 @@ am__objects_5 = s_finite.lo s_copysign.lo s_modf.lo s_scalbn.lo \
s_cbrt.lo s_exp10.lo s_expm1.lo s_ilogb.lo s_infinity.lo \
s_isinf.lo s_isinfd.lo s_isnan.lo s_isnand.lo s_log1p.lo \
s_nan.lo s_nextafter.lo s_pow10.lo s_rint.lo s_logb.lo \
s_log2.lo s_lib_ver.lo s_fdim.lo s_fma.lo s_fmax.lo s_fmin.lo \
s_log2.lo s_fdim.lo s_fma.lo s_fmax.lo s_fmin.lo \
s_fpclassify.lo s_lrint.lo s_llrint.lo s_lround.lo \
s_llround.lo s_nearbyint.lo s_remquo.lo s_round.lo \
s_scalbln.lo s_signbit.lo s_trunc.lo exp.lo exp2.lo \
@ -354,7 +354,7 @@ src = s_finite.c s_copysign.c s_modf.c s_scalbn.c \
s_cbrt.c s_exp10.c s_expm1.c s_ilogb.c \
s_infinity.c s_isinf.c s_isinfd.c s_isnan.c s_isnand.c \
s_log1p.c s_nan.c s_nextafter.c s_pow10.c \
s_rint.c s_logb.c s_log2.c s_lib_ver.c \
s_rint.c s_logb.c s_log2.c \
s_fdim.c s_fma.c s_fmax.c s_fmin.c s_fpclassify.c \
s_lrint.c s_llrint.c \
s_lround.c s_llround.c s_nearbyint.c s_remquo.c s_round.c s_scalbln.c \
@ -602,12 +602,6 @@ lib_a-s_log2.o: s_log2.c
lib_a-s_log2.obj: s_log2.c
$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(lib_a_CFLAGS) $(CFLAGS) -c -o lib_a-s_log2.obj `if test -f 's_log2.c'; then $(CYGPATH_W) 's_log2.c'; else $(CYGPATH_W) '$(srcdir)/s_log2.c'; fi`
lib_a-s_lib_ver.o: s_lib_ver.c
$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(lib_a_CFLAGS) $(CFLAGS) -c -o lib_a-s_lib_ver.o `test -f 's_lib_ver.c' || echo '$(srcdir)/'`s_lib_ver.c
lib_a-s_lib_ver.obj: s_lib_ver.c
$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(lib_a_CFLAGS) $(CFLAGS) -c -o lib_a-s_lib_ver.obj `if test -f 's_lib_ver.c'; then $(CYGPATH_W) 's_lib_ver.c'; else $(CYGPATH_W) '$(srcdir)/s_lib_ver.c'; fi`
lib_a-s_fdim.o: s_fdim.c
$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(lib_a_CFLAGS) $(CFLAGS) -c -o lib_a-s_fdim.o `test -f 's_fdim.c' || echo '$(srcdir)/'`s_fdim.c

1
newlib/libm/common/fdlibm.h
View File

@ -15,6 +15,7 @@
#include <math.h>
#include <sys/types.h>
#include <machine/ieeefp.h>
#include "math_config.h"
/* Most routines need to check whether a float is finite, infinite, or not a
number, and many need to know whether the result of an operation will

5
newlib/libm/common/math_config.h
View File

@ -38,15 +38,20 @@
#endif
#ifdef _IEEE_LIBM
# define WANT_ERRNO 0
# define _LIB_VERSION _IEEE_
#else
/* Set errno according to ISO C with (math_errhandling & MATH_ERRNO) != 0. */
# define WANT_ERRNO 1
# define _LIB_VERSION _POSIX_
#endif
#ifndef WANT_ERRNO_UFLOW
/* Set errno to ERANGE if result underflows to 0 (in all rounding modes). */
# define WANT_ERRNO_UFLOW (WANT_ROUNDING && WANT_ERRNO)
#endif
#define _IEEE_ -1
#define _POSIX_ 0
/* Compiler can inline round as a single instruction. */
#ifndef HAVE_FAST_ROUND
# if __aarch64__

35
newlib/libm/common/s_lib_ver.c
View File

@ -1,35 +0,0 @@
/* @(#)s_lib_ver.c 5.1 93/09/24 */
/*
* ====================================================
* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
*
* Developed at SunPro, a Sun Microsystems, Inc. business.
* Permission to use, copy, modify, and distribute this
* software is freely granted, provided that this notice
* is preserved.
* ====================================================
*/
/*
* MACRO for standards
*/
#include "fdlibm.h"
/*
* define and initialize _LIB_VERSION
*/
#ifdef _POSIX_MODE
_LIB_VERSION_TYPE _LIB_VERSION = _POSIX_;
#else
#ifdef _XOPEN_MODE
#error _XOPEN_MODE is unsupported
#else
#ifdef _SVID3_MODE
#error _SVID3_MODE is unsupported
#else /* default _IEEE_MODE */
_LIB_VERSION_TYPE _LIB_VERSION = _IEEE_;
#endif
#endif
#endif