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glibc/math/bits/math-finite.h
Siddhesh Poyarekar 884ddc5081 Revert to defining __extern_inline only for gcc-4.3+ (BZ #17266) 
The check for only __GNUC_STDC_INLINE__ and __GNUC_GNU_INLINE__ may
not be sufficient since those flags were added during initial support
for C99 inlining semantics.  There is also a problem with always
defining __extern_inline and __extern_always_inline, since it enables
inline wrapper functions even when GNU inlining semantics are not
guaranteed.  This, along with the possibility of such wrappers using
redirection (btowc for example) could result in compiler generating an
infinitely recusrive call to the function.

In fact it was such a recursion that led to this code being written
the way it was; see:

https://bugzilla.redhat.com/show_bug.cgi?id=186410

The initial change was to fix bugs 14530 and 13741, but they can be
resolved by checking if __fortify_function and/or
__extern_always_inline are defined, as it has been done in this patch.
In addition, I have audited uses of __extern_always_inline to make
sure that none of the uses result in compilation errors.

There is however a regression in this patch for llvm, since it reverts
the llvm expectation that __GNUC_STDC_INLINE__ or __GNUC_GNU_INLINE__
definition imply proper extern inline semantics.

2014-09-16  Siddhesh Poyarekar  <siddhesh@redhat.com>
	    Jakub Jelinek  <jakub@redhat.com>

	[BZ #17266]
	* libio/stdio.h: Check definition of __fortify_function
	instead of __extern_always_inline to include bits/stdio2.h.
	* math/bits/math-finite.h [__USE_XOPEN || __USE_ISOC99]: Also
	check if __extern_always_inline is defined.
	[__USE_MISC || __USE_XOPEN]: Likewise.
	[__USE_ISOC99] Likewise.
	* misc/sys/cdefs.h (__fortify_function): Define only if
	__extern_always_inline is defined.
	[!__cplusplus || __GNUC_PREREQ (4,3)]: Revert to defining
	__extern_always_inline and __extern_inline only for g++-4.3
	and newer or a compatible gcc.
2014-09-16 14:08:48 +05:30

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/* Entry points to finite-math-only compiler runs.
Copyright (C) 2011-2014 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#ifndef _MATH_H
# error "Never use <bits/math-finite.h> directly; include <math.h> instead."
#endif
/* acos. */
extern double __REDIRECT_NTH (acos, (double), __acos_finite);
extern float __REDIRECT_NTH (acosf, (float), __acosf_finite);
#ifdef __MATH_DECLARE_LDOUBLE
# ifdef __NO_LONG_DOUBLE_MATH
extern long double __REDIRECT_NTH (acosl, (long double), __acos_finite);
# else
extern long double __REDIRECT_NTH (acosl, (long double), __acosl_finite);
# endif
#endif
#if defined __USE_XOPEN_EXTENDED || defined __USE_ISOC99
/* acosh. */
extern double __REDIRECT_NTH (acosh, (double), __acosh_finite);
extern float __REDIRECT_NTH (acoshf, (float), __acoshf_finite);
# ifdef __MATH_DECLARE_LDOUBLE
# ifdef __NO_LONG_DOUBLE_MATH
extern long double __REDIRECT_NTH (acoshl, (long double), __acosh_finite);
# else
extern long double __REDIRECT_NTH (acoshl, (long double), __acoshl_finite);
# endif
# endif
#endif
/* asin. */
extern double __REDIRECT_NTH (asin, (double), __asin_finite);
extern float __REDIRECT_NTH (asinf, (float), __asinf_finite);
#ifdef __MATH_DECLARE_LDOUBLE
# ifdef __NO_LONG_DOUBLE_MATH
extern long double __REDIRECT_NTH (asinl, (long double), __asin_finite);
# else
extern long double __REDIRECT_NTH (asinl, (long double), __asinl_finite);
# endif
#endif
/* atan2. */
extern double __REDIRECT_NTH (atan2, (double, double), __atan2_finite);
extern float __REDIRECT_NTH (atan2f, (float, float), __atan2f_finite);
#ifdef __MATH_DECLARE_LDOUBLE
# ifdef __NO_LONG_DOUBLE_MATH
extern long double __REDIRECT_NTH (atan2l, (long double, long double),
__atan2_finite);
# else
extern long double __REDIRECT_NTH (atan2l, (long double, long double),
__atan2l_finite);
# endif
#endif
#if defined __USE_XOPEN_EXTENDED || defined __USE_ISOC99
/* atanh. */
extern double __REDIRECT_NTH (atanh, (double), __atanh_finite);
extern float __REDIRECT_NTH (atanhf, (float), __atanhf_finite);
# ifdef __MATH_DECLARE_LDOUBLE
# ifdef __NO_LONG_DOUBLE_MATH
extern long double __REDIRECT_NTH (atanhl, (long double), __atanh_finite);
# else
extern long double __REDIRECT_NTH (atanhl, (long double), __atanhl_finite);
# endif
# endif
#endif
/* cosh. */
extern double __REDIRECT_NTH (cosh, (double), __cosh_finite);
extern float __REDIRECT_NTH (coshf, (float), __coshf_finite);
#ifdef __MATH_DECLARE_LDOUBLE
# ifdef __NO_LONG_DOUBLE_MATH
extern long double __REDIRECT_NTH (coshl, (long double), __cosh_finite);
# else
extern long double __REDIRECT_NTH (coshl, (long double), __coshl_finite);
# endif
#endif
/* exp. */
extern double __REDIRECT_NTH (exp, (double), __exp_finite);
extern float __REDIRECT_NTH (expf, (float), __expf_finite);
#ifdef __MATH_DECLARE_LDOUBLE
# ifdef __NO_LONG_DOUBLE_MATH
extern long double __REDIRECT_NTH (expl, (long double), __exp_finite);
# else
extern long double __REDIRECT_NTH (expl, (long double), __expl_finite);
# endif
#endif
#ifdef __USE_GNU
/* exp10. */
extern double __REDIRECT_NTH (exp10, (double), __exp10_finite);
extern float __REDIRECT_NTH (exp10f, (float), __exp10f_finite);
# ifdef __MATH_DECLARE_LDOUBLE
# ifdef __NO_LONG_DOUBLE_MATH
extern long double __REDIRECT_NTH (exp10l, (long double), __exp10_finite);
# else
extern long double __REDIRECT_NTH (exp10l, (long double), __exp10l_finite);
# endif
# endif
/* pow10. */
extern double __REDIRECT_NTH (pow10, (double), __exp10_finite);
extern float __REDIRECT_NTH (pow10f, (float), __exp10f_finite);
# ifdef __MATH_DECLARE_LDOUBLE
# ifdef __NO_LONG_DOUBLE_MATH
extern long double __REDIRECT_NTH (pow10l, (long double), __exp10_finite);
# else
extern long double __REDIRECT_NTH (pow10l, (long double), __exp10l_finite);
# endif
# endif
#endif
#ifdef __USE_ISOC99
/* exp2. */
extern double __REDIRECT_NTH (exp2, (double), __exp2_finite);
extern float __REDIRECT_NTH (exp2f, (float), __exp2f_finite);
# ifdef __MATH_DECLARE_LDOUBLE
# ifdef __NO_LONG_DOUBLE_MATH
extern long double __REDIRECT_NTH (exp2l, (long double), __exp2_finite);
# else
extern long double __REDIRECT_NTH (exp2l, (long double), __exp2l_finite);
# endif
# endif
#endif
/* fmod. */
extern double __REDIRECT_NTH (fmod, (double, double), __fmod_finite);
extern float __REDIRECT_NTH (fmodf, (float, float), __fmodf_finite);
#ifdef __MATH_DECLARE_LDOUBLE
# ifdef __NO_LONG_DOUBLE_MATH
extern long double __REDIRECT_NTH (fmodl, (long double, long double),
__fmod_finite);
# else
extern long double __REDIRECT_NTH (fmodl, (long double, long double),
__fmodl_finite);
# endif
#endif
#ifdef __USE_ISOC99
/* hypot. */
extern double __REDIRECT_NTH (hypot, (double, double), __hypot_finite);
extern float __REDIRECT_NTH (hypotf, (float, float), __hypotf_finite);
# ifdef __MATH_DECLARE_LDOUBLE
# ifdef __NO_LONG_DOUBLE_MATH
extern long double __REDIRECT_NTH (hypotl, (long double, long double),
__hypot_finite);
# else
extern long double __REDIRECT_NTH (hypotl, (long double, long double),
__hypotl_finite);
# endif
# endif
#endif
#if defined __USE_MISC || defined __USE_XOPEN
/* j0. */
extern double __REDIRECT_NTH (j0, (double), __j0_finite);
extern float __REDIRECT_NTH (j0f, (float), __j0f_finite);
# ifdef __MATH_DECLARE_LDOUBLE
# ifdef __NO_LONG_DOUBLE_MATH
extern long double __REDIRECT_NTH (j0l, (long double), __j0_finite);
# else
extern long double __REDIRECT_NTH (j0l, (long double), __j0l_finite);
# endif
# endif
/* y0. */
extern double __REDIRECT_NTH (y0, (double), __y0_finite);
extern float __REDIRECT_NTH (y0f, (float), __y0f_finite);
# ifdef __MATH_DECLARE_LDOUBLE
# ifdef __NO_LONG_DOUBLE_MATH
extern long double __REDIRECT_NTH (y0l, (long double), __y0_finite);
# else
extern long double __REDIRECT_NTH (y0l, (long double), __y0l_finite);
# endif
# endif
/* j1. */
extern double __REDIRECT_NTH (j1, (double), __j1_finite);
extern float __REDIRECT_NTH (j1f, (float), __j1f_finite);
# ifdef __MATH_DECLARE_LDOUBLE
# ifdef __NO_LONG_DOUBLE_MATH
extern long double __REDIRECT_NTH (j1l, (long double), __j1_finite);
# else
extern long double __REDIRECT_NTH (j1l, (long double), __j1l_finite);
# endif
# endif
/* y1. */
extern double __REDIRECT_NTH (y1, (double), __y1_finite);
extern float __REDIRECT_NTH (y1f, (float), __y1f_finite);
# ifdef __MATH_DECLARE_LDOUBLE
# ifdef __NO_LONG_DOUBLE_MATH
extern long double __REDIRECT_NTH (y1l, (long double), __y1_finite);
# else
extern long double __REDIRECT_NTH (y1l, (long double), __y1l_finite);
# endif
# endif
/* jn. */
extern double __REDIRECT_NTH (jn, (int, double), __jn_finite);
extern float __REDIRECT_NTH (jnf, (int, float), __jnf_finite);
# ifdef __MATH_DECLARE_LDOUBLE
# ifdef __NO_LONG_DOUBLE_MATH
extern long double __REDIRECT_NTH (jnl, (int, long double), __jn_finite);
# else
extern long double __REDIRECT_NTH (jnl, (int, long double), __jnl_finite);
# endif
# endif
/* yn. */
extern double __REDIRECT_NTH (yn, (int, double), __yn_finite);
extern float __REDIRECT_NTH (ynf, (int, float), __ynf_finite);
# ifdef __MATH_DECLARE_LDOUBLE
# ifdef __NO_LONG_DOUBLE_MATH
extern long double __REDIRECT_NTH (ynl, (int, long double), __yn_finite);
# else
extern long double __REDIRECT_NTH (ynl, (int, long double), __ynl_finite);
# endif
# endif
#endif
#ifdef __USE_MISC
/* lgamma_r. */
extern double __REDIRECT_NTH (lgamma_r, (double, int *), __lgamma_r_finite);
extern float __REDIRECT_NTH (lgammaf_r, (float, int *), __lgammaf_r_finite);
# ifdef __MATH_DECLARE_LDOUBLE
# ifdef __NO_LONG_DOUBLE_MATH
extern long double __REDIRECT_NTH (lgammal_r, (long double, int *),
__lgamma_r_finite);
# else
extern long double __REDIRECT_NTH (lgammal_r, (long double, int *),
__lgammal_r_finite);
# endif
# endif
#endif
#if ((defined __USE_XOPEN || defined __USE_ISOC99) \
&& defined __extern_always_inline)
/* lgamma. */
__extern_always_inline double __NTH (lgamma (double __d))
{
# ifdef __USE_ISOC99
int __local_signgam = 0;
return lgamma_r (__d, &__local_signgam);
# else
return lgamma_r (__d, &signgam);
# endif
}
__extern_always_inline float __NTH (lgammaf (float __d))
{
# ifdef __USE_ISOC99
int __local_signgam = 0;
return lgammaf_r (__d, &__local_signgam);
# else
return lgammaf_r (__d, &signgam);
# endif
}
# ifdef __MATH_DECLARE_LDOUBLE
__extern_always_inline long double __NTH (lgammal (long double __d))
{
# ifdef __USE_ISOC99
int __local_signgam = 0;
return lgammal_r (__d, &__local_signgam);
# else
return lgammal_r (__d, &signgam);
# endif
}
# endif
#endif
#if ((defined __USE_MISC || defined __USE_XOPEN) \
&& defined __extern_always_inline)
/* gamma. */
__extern_always_inline double __NTH (gamma (double __d))
{
# ifdef __USE_ISOC99
int __local_signgam = 0;
return lgamma_r (__d, &__local_signgam);
# else
return lgamma_r (__d, &signgam);
# endif
}
__extern_always_inline float __NTH (gammaf (float __d))
{
# ifdef __USE_ISOC99
int __local_signgam = 0;
return lgammaf_r (__d, &__local_signgam);
# else
return lgammaf_r (__d, &signgam);
# endif
}
# ifdef __MATH_DECLARE_LDOUBLE
__extern_always_inline long double __NTH (gammal (long double __d))
{
# ifdef __USE_ISOC99
int __local_signgam = 0;
return lgammal_r (__d, &__local_signgam);
# else
return lgammal_r (__d, &signgam);
# endif
}
# endif
#endif
/* log. */
extern double __REDIRECT_NTH (log, (double), __log_finite);
extern float __REDIRECT_NTH (logf, (float), __logf_finite);
#ifdef __MATH_DECLARE_LDOUBLE
# ifdef __NO_LONG_DOUBLE_MATH
extern long double __REDIRECT_NTH (logl, (long double), __log_finite);
# else
extern long double __REDIRECT_NTH (logl, (long double), __logl_finite);
# endif
#endif
/* log10. */
extern double __REDIRECT_NTH (log10, (double), __log10_finite);
extern float __REDIRECT_NTH (log10f, (float), __log10f_finite);
#ifdef __MATH_DECLARE_LDOUBLE
# ifdef __NO_LONG_DOUBLE_MATH
extern long double __REDIRECT_NTH (log10l, (long double), __log10_finite);
# else
extern long double __REDIRECT_NTH (log10l, (long double), __log10l_finite);
# endif
#endif
#ifdef __USE_ISOC99
/* log2. */
extern double __REDIRECT_NTH (log2, (double), __log2_finite);
extern float __REDIRECT_NTH (log2f, (float), __log2f_finite);
# ifdef __MATH_DECLARE_LDOUBLE
# ifdef __NO_LONG_DOUBLE_MATH
extern long double __REDIRECT_NTH (log2l, (long double), __log2_finite);
# else
extern long double __REDIRECT_NTH (log2l, (long double), __log2l_finite);
# endif
# endif
#endif
/* ldexp. */
extern double __REDIRECT_NTH (ldexp, (double, int), scalbn);
extern float __REDIRECT_NTH (ldexpf, (float, int), scalbnf);
#ifdef __MATH_DECLARE_LDOUBLE
extern long double __REDIRECT_NTH (ldexpl, (long double, int), scalbnl);
#endif
/* pow. */
extern double __REDIRECT_NTH (pow, (double, double), __pow_finite);
extern float __REDIRECT_NTH (powf, (float, float), __powf_finite);
#ifdef __MATH_DECLARE_LDOUBLE
# ifdef __NO_LONG_DOUBLE_MATH
extern long double __REDIRECT_NTH (powl, (long double, long double),
__pow_finite);
# else
extern long double __REDIRECT_NTH (powl, (long double, long double),
__powl_finite);
# endif
#endif
/* remainder. */
extern double __REDIRECT_NTH (remainder, (double, double), __remainder_finite);
extern float __REDIRECT_NTH (remainderf, (float, float), __remainderf_finite);
#ifdef __MATH_DECLARE_LDOUBLE
# ifdef __NO_LONG_DOUBLE_MATH
extern long double __REDIRECT_NTH (remainderl, (long double, long double),
__remainder_finite);
# else
extern long double __REDIRECT_NTH (remainderl, (long double, long double),
__remainderl_finite);
# endif
#endif
#if defined __USE_MISC || defined __USE_XOPEN_EXTENDED
/* scalb. */
extern double __REDIRECT_NTH (scalb, (double, double), __scalb_finite);
extern float __REDIRECT_NTH (scalbf, (float, float), __scalbf_finite);
# ifdef __MATH_DECLARE_LDOUBLE
# ifdef __NO_LONG_DOUBLE_MATH
extern long double __REDIRECT_NTH (scalbl, (long double, long double),
__scalb_finite);
# else
extern long double __REDIRECT_NTH (scalbl, (long double, long double),
__scalbl_finite);
# endif
# endif
#endif
/* sinh. */
extern double __REDIRECT_NTH (sinh, (double), __sinh_finite);
extern float __REDIRECT_NTH (sinhf, (float), __sinhf_finite);
#ifdef __MATH_DECLARE_LDOUBLE
# ifdef __NO_LONG_DOUBLE_MATH
extern long double __REDIRECT_NTH (sinhl, (long double), __sinh_finite);
# else
extern long double __REDIRECT_NTH (sinhl, (long double), __sinhl_finite);
# endif
#endif
/* sqrt. */
extern double __REDIRECT_NTH (sqrt, (double), __sqrt_finite);
extern float __REDIRECT_NTH (sqrtf, (float), __sqrtf_finite);
#ifdef __MATH_DECLARE_LDOUBLE
# ifdef __NO_LONG_DOUBLE_MATH
extern long double __REDIRECT_NTH (sqrtl, (long double), __sqrt_finite);
# else
extern long double __REDIRECT_NTH (sqrtl, (long double), __sqrtl_finite);
# endif
#endif
#if defined __USE_ISOC99 && defined __extern_always_inline
/* tgamma. */
extern double __gamma_r_finite (double, int *);
__extern_always_inline double __NTH (tgamma (double __d))
{
int __local_signgam = 0;
double __res = __gamma_r_finite (__d, &__local_signgam);
return __local_signgam < 0 ? -__res : __res;
}
extern float __gammaf_r_finite (float, int *);
__extern_always_inline float __NTH (tgammaf (float __d))
{
int __local_signgam = 0;
float __res = __gammaf_r_finite (__d, &__local_signgam);
return __local_signgam < 0 ? -__res : __res;
}
# ifdef __MATH_DECLARE_LDOUBLE
extern long double __gammal_r_finite (long double, int *);
__extern_always_inline long double __NTH (tgammal (long double __d))
{
int __local_signgam = 0;
# ifdef __NO_LONG_DOUBLE_MATH
long double __res = __gamma_r_finite (__d, &__local_signgam);
# else
long double __res = __gammal_r_finite (__d, &__local_signgam);
# endif
return __local_signgam < 0 ? -__res : __res;
}
# endif
#endif
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