Move fenv.h soft-float inlines from fenv_private.h to include/fenv.h.

<fenv_private.h> has inline versions of various <fenv.h> functions,
and their __fe* variants, for systems (generally soft-float) without
support for floating-point exceptions, rounding modes or both.

Having these inlines in a separate header introduces a risk of a
source file including <fenv.h> and compiling OK on x86_64, but failing
to compile (because the feraiseexcept inline is actually a macro that
discards its argument, to avoid the need for #ifdef FE_INVALID
conditionals), or not being properly optimized, on systems without the
exceptions and rounding modes support (when these inlines were in
math_private.h, we had a few cases where this broke the build because
there was no obvious reason for a file to need math_private.h and it
didn't need that header on x86_64).  By moving those inlines to
include/fenv.h, this risk can be avoided, and fenv_private.h becomes
more clearly defined as specifically the header for the internal
libc_fe* and SET_RESTORE_ROUND* interfaces.

This patch makes that move, removing fenv_private.h includes that are
no longer needed (or replacing them by fenv.h includes in a few cases
that didn't already have such an include).

Tested for x86_64 and x86, and tested with build-many-glibcs.py that
installed stripped shared libraries are unchanged by the patch.

	* sysdeps/generic/fenv_private.h [FE_ALL_EXCEPT == 0]: Move this
	code ....
	[!FE_HAVE_ROUNDING_MODES]: And this code ....
	* include/fenv.h [!_ISOMAC]: ... to here.
	* math/fraiseexcpt.c (__feraiseexcept): Undefine as macro.
	(feraiseexcept): Likewise.
	* math/fromfp.h: Do not include <fenv_private.h>.
	* math/s_cexp_template.c: Likewise.
	* math/s_csin_template.c: Likewise.
	* math/s_csinh_template.c: Likewise.
	* math/s_ctan_template.c: Likewise.
	* math/s_ctanh_template.c: Likewise.
	* math/s_iseqsig_template.c: Likewise.
	* math/w_acos_compat.c: Likewise.
	* math/w_acosf_compat.c: Likewise.
	* math/w_acosl_compat.c: Likewise.
	* math/w_asin_compat.c: Likewise.
	* math/w_asinf_compat.c: Likewise.
	* math/w_asinl_compat.c: Likewise.
	* math/w_j0_compat.c: Likewise.
	* math/w_j0f_compat.c: Likewise.
	* math/w_j0l_compat.c: Likewise.
	* math/w_j1_compat.c: Likewise.
	* math/w_j1f_compat.c: Likewise.
	* math/w_j1l_compat.c: Likewise.
	* math/w_jn_compat.c: Likewise.
	* math/w_jnf_compat.c: Likewise.
	* math/w_log10_compat.c: Likewise.
	* math/w_log10f_compat.c: Likewise.
	* math/w_log10l_compat.c: Likewise.
	* math/w_log2_compat.c: Likewise.
	* math/w_log2f_compat.c: Likewise.
	* math/w_log2l_compat.c: Likewise.
	* math/w_log_compat.c: Likewise.
	* math/w_logf_compat.c: Likewise.
	* math/w_logl_compat.c: Likewise.
	* sysdeps/ieee754/dbl-64/s_llrint.c: Likewise.
	* sysdeps/ieee754/dbl-64/s_llround.c: Likewise.
	* sysdeps/ieee754/dbl-64/s_lrint.c: Likewise.
	* sysdeps/ieee754/dbl-64/s_lround.c: Likewise.
	* sysdeps/ieee754/dbl-64/wordsize-64/s_lround.c: Likewise.
	* sysdeps/ieee754/flt-32/s_llrintf.c: Likewise.
	* sysdeps/ieee754/flt-32/s_llroundf.c: Likewise.
	* sysdeps/ieee754/flt-32/s_lrintf.c: Likewise.
	* sysdeps/ieee754/flt-32/s_lroundf.c: Likewise.
	* sysdeps/ieee754/k_standardl.c: Likewise.
	* sysdeps/ieee754/ldbl-128/e_expl.c: Likewise.
	* sysdeps/ieee754/ldbl-128/s_fmal.c: Likewise.
	* sysdeps/ieee754/ldbl-128/s_llrintl.c: Likewise.
	* sysdeps/ieee754/ldbl-128/s_llroundl.c: Likewise.
	* sysdeps/ieee754/ldbl-128/s_lrintl.c: Likewise.
	* sysdeps/ieee754/ldbl-128/s_lroundl.c: Likewise.
	* sysdeps/ieee754/ldbl-128/s_nearbyintl.c: Likewise.
	* sysdeps/ieee754/ldbl-128ibm/s_llrintl.c: Likewise.
	* sysdeps/ieee754/ldbl-128ibm/s_llroundl.c: Likewise.
	* sysdeps/ieee754/ldbl-128ibm/s_lrintl.c: Likewise.
	* sysdeps/ieee754/ldbl-128ibm/s_lroundl.c: Likewise.
	* sysdeps/ieee754/ldbl-96/s_fma.c: Likewise.
	* sysdeps/ieee754/ldbl-96/s_fmal.c: Likewise.
	* sysdeps/ieee754/ldbl-96/s_llrintl.c: Likewise.
	* sysdeps/ieee754/ldbl-96/s_llroundl.c: Likewise.
	* sysdeps/ieee754/ldbl-96/s_lrintl.c: Likewise.
	* sysdeps/ieee754/ldbl-96/s_lroundl.c: Likewise.
	* math/w_ilogb_template.c: Include <fenv.h> instead of
	<fenv_private.h>.
	* math/w_llogb_template.c: Likewise.
	* sysdeps/powerpc/fpu/e_sqrt.c: Likewise.
	* sysdeps/powerpc/fpu/e_sqrtf.c: Likewise.

1 files changed, 90 insertions, 0 deletions

diff --git a/include/fenv.h b/include/fenv.h
index 76679e1e18..0b32f80964 100644
--- a/include/fenv.h
+++ b/include/fenv.h
@@ -57,6 +57,96 @@ struct rm_ctx
 #  define FE_HAVE_ROUNDING_MODES 0
 # endif
 
+/* When no floating-point exceptions are defined in <fenv.h>, make
+   feraiseexcept ignore its argument so that unconditional
+   feraiseexcept calls do not cause errors for undefined exceptions.
+   Define it to expand to a void expression so that any calls testing
+   the result of feraiseexcept do produce errors.  */
+# if FE_ALL_EXCEPT == 0
+#  define feraiseexcept(excepts) ((void) 0)
+#  define __feraiseexcept(excepts) ((void) 0)
+# endif
+
+/* Similarly, most <fenv.h> functions have trivial implementations in
+   the absence of support for floating-point exceptions and rounding
+   modes.  */
+
+# if !FE_HAVE_ROUNDING_MODES
+#  if FE_ALL_EXCEPT == 0
+extern inline int
+fegetenv (fenv_t *__e)
+{
+  return 0;
+}
+
+extern inline int
+__fegetenv (fenv_t *__e)
+{
+  return 0;
+}
+
+extern inline int
+feholdexcept (fenv_t *__e)
+{
+  return 0;
+}
+
+extern inline int
+__feholdexcept (fenv_t *__e)
+{
+  return 0;
+}
+
+extern inline int
+fesetenv (const fenv_t *__e)
+{
+  return 0;
+}
+
+extern inline int
+__fesetenv (const fenv_t *__e)
+{
+  return 0;
+}
+
+extern inline int
+feupdateenv (const fenv_t *__e)
+{
+  return 0;
+}
+
+extern inline int
+__feupdateenv (const fenv_t *__e)
+{
+  return 0;
+}
+#  endif
+
+extern inline int
+fegetround (void)
+{
+  return FE_TONEAREST;
+}
+
+extern inline int
+__fegetround (void)
+{
+  return FE_TONEAREST;
+}
+
+extern inline int
+fesetround (int __d)
+{
+  return 0;
+}
+
+extern inline int
+__fesetround (int __d)
+{
+  return 0;
+}
+# endif
+
 #endif
 
 #endif