Clean up powerpc fegetround / __fegetround inlines.

The natural fix for some linknamespace test failures, where C90 libm
functions call C99 <fenv.h> functions, is to make fe* into weak
aliases for __fe* and call __fe* from within libm as needed.

To do this, the __fe* names need to be available for that purpose -
that is, they must not be used for something other than aliases of
fe*.  On powerpc, however, __fegetround is an inline function in
fenv_libc.h, with no corresponding fegetround inline function;
fegetround has an equivalent macro expansion in bits/fenvinline.h, but
that is disabled if __NO_MATH_INLINES (which is defined for building
libm).

I see no need for that disabling; it's not even clear that
__NO_MATH_INLINES should affect <fenv.h>, and the results of
fegetround are completely defined so there is no semantic effect of
that disabling at all outside glibc.  The x86 inline feraiseexcept is
conditioned on __USE_EXTERN_INLINES not __NO_MATH_INLINES (but that's
an inline function rather than a macro).

This patch removes the __NO_MATH_INLINES conditional on that
fegetround macro, so resulting in it being expanded inline inside
glibc.  In turn, this means that direct calls to __fegetround from C99
functions in ldbl-128ibm can be changed to calls to fegetround, so
that nofpu fenv_libc.h files don't need to define __fegetround at all
and, by changing ldbl-128ibm files to use <fenv.h> not <fenv_libc.h>,
non-e500 nofpu no longer needs an fenv_libc.h file.

The other macros in fenvinline.h are left conditional on
__NO_MATH_INLINES, although since the only case where this should make
a difference is one involving undefined behavior (if the argument to
the function is not a valid exception macro).

The out-of-line definition for fegetround uses __fegetround (the
inline function removed by this patch).  So this continues to work,
the fenvinline.h header is made to define __fegetround, and then to
define fegetround to call __fegetround.

Tested for powerpc32 (hard float) that installed stripped shared
libraries are unchanged by this patch; also tested that powerpc-nofpu
build still works.  (This patch does not itself fix any bugs; it
simply cleans things up in preparation for separate bug fixes.)

	* sysdeps/powerpc/bits/fenvinline.h (fegetround): Rename macro to
	__fegetround and redefine to call __fegetround.  Remove condition
	on [!__NO_MATH_INLINES].
	* sysdeps/powerpc/fpu/fenv_libc.h (__fegetround): Remove inline
	function.
	* sysdeps/powerpc/nofpu/fenv_libc.h: Remove file.
	* sysdeps/powerpc/powerpc32/e500/nofpu/fenv_libc.h (__fegetround):
	Remove macro.
	* sysdeps/ieee754/ldbl-128ibm/s_llrintl.c: Include <fenv.h>
	instead of <fenv_libc.h>.
	(__llrintl): Call fegetround instead of __fegetround.
	* sysdeps/ieee754/ldbl-128ibm/s_llroundl.c: Include <fenv.h>
	instead of <fenv_libc.h>.
	* sysdeps/ieee754/ldbl-128ibm/s_lrintl.c: Likewise.
	(__lrintl): Call fegetround instead of __fegetround.
	* sysdeps/ieee754/ldbl-128ibm/s_lroundl.c: Include <fenv.h>
	instead of <fenv_libc.h>.
	* sysdeps/ieee754/ldbl-128ibm/s_rintl.c: Likewise.
	(__rintl): Call fegetround instead of __fegetround.

1 files changed, 8 insertions, 5 deletions

diff --git a/sysdeps/powerpc/bits/fenvinline.h b/sysdeps/powerpc/bits/fenvinline.h
index 00336f3b0d..e914928eaa 100644
--- a/sysdeps/powerpc/bits/fenvinline.h
+++ b/sysdeps/powerpc/bits/fenvinline.h
@@ -16,23 +16,24 @@
    License along with the GNU C Library; if not, see
    <http://www.gnu.org/licenses/>.  */
 
-#if (defined __GNUC__ && !defined _SOFT_FLOAT && !defined __NO_FPRS__	\
-     && !defined __NO_MATH_INLINES)
+#if defined __GNUC__ && !defined _SOFT_FLOAT && !defined __NO_FPRS__
 
 /* Inline definition for fegetround.  */
-# define fegetround() \
+# define __fegetround() \
   (__extension__  ({ int __fegetround_result;				      \
 		     __asm__ __volatile__				      \
 		       ("mcrfs 7,7 ; mfcr %0"				      \
 			: "=r"(__fegetround_result) : : "cr7");		      \
 		     __fegetround_result & 3; }))
+# define fegetround() __fegetround ()
 
+# ifndef __NO_MATH_INLINES
 /* The weird 'i#*X' constraints on the following suppress a gcc
    warning when __excepts is not a constant.  Otherwise, they mean the
    same as just plain 'i'.  */
 
 /* Inline definition for feraiseexcept.  */
-# define feraiseexcept(__excepts) \
+#  define feraiseexcept(__excepts) \
   ((__builtin_constant_p (__excepts)					      \
     && ((__excepts) & ((__excepts)-1)) == 0				      \
     && (__excepts) != FE_INVALID)					      \
@@ -45,7 +46,7 @@
    : (feraiseexcept) (__excepts))
 
 /* Inline definition for feclearexcept.  */
-# define feclearexcept(__excepts) \
+#  define feclearexcept(__excepts) \
   ((__builtin_constant_p (__excepts)					      \
     && ((__excepts) & ((__excepts)-1)) == 0				      \
     && (__excepts) != FE_INVALID)					      \
@@ -57,4 +58,6 @@
       : 0)								      \
    : (feclearexcept) (__excepts))
 
+# endif /* !__NO_MATH_INLINES.  */
+
 #endif /* __GNUC__ && !_SOFT_FLOAT && !__NO_FPRS__ */