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, 0 insertions, 31 deletions

diff --git a/sysdeps/powerpc/nofpu/fenv_libc.h b/sysdeps/powerpc/nofpu/fenv_libc.h
deleted file mode 100644
index dce1524e3f..0000000000
--- a/sysdeps/powerpc/nofpu/fenv_libc.h
+++ /dev/null
@@ -1,31 +0,0 @@
-/* Internal libc stuff for floating point environment routines.
-   Copyright (C) 2007-2014 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 _FENV_LIBC_H
-#define _FENV_LIBC_H	1
-
-/* fenv_libc.h is used in libm implementations of ldbl-128ibm.  So we
-   need this version in the soft-fp to at minimum include fenv.h to
-   get the fegetround definition.  */
-
-#include <fenv.h>
-
-/* ldbl-128ibm code uses __fegetround.  */
-#define __fegetround()	fegetround ()
-
-#endif /* fenv_libc.h */