Remove some math_private.h libc_feholdexcept_setround overrides.

math_private.h headers for configurations lacking support for
floating-point exceptions and rounding modes define
libc_feholdexcept_setround to override the default version with one
that discards its rounding mode argument.

Unlike other such libc_fe* macros that I removed, this one is actually
used for such configurations (in dbl-64/e_sqrt.c).  However, this does
not make the macro required.  It's only used for such configurations
with FE_TONEAREST as the rounding mode (anything needing another mode
should not be used when that mode is unavailable), and the default
definition just calls __feholdexcept and __fesetround.  Since we now
have suitable inline do-nothing definitions of __feholdexcept and
__fesetround for the cases of no exceptions and rounding modes, we can
just rely on those inlines to achieve the same optimization as this
macro definition.  Thus, this patch removes those macro definitions
(and the math_private.h headers containing them, when no longer needed
after that removal).

Tested with build-many-glibcs.py that installed stripped shared
libraries are unchanged by the patch.

	* sysdeps/m68k/coldfire/fpu/math_private.h: Move to ....
	* sysdeps/m68k/coldfire/math_private.h: ... here.
	* sysdeps/m68k/coldfire/nofpu/math_private.h: Remove file.
	* sysdeps/tile/math_private.h: Likewise.
	* sysdeps/microblaze/math_private.h (libc_feholdexcept_setround):
	Remove macro.
	* sysdeps/nios2/math_private.h (libc_feholdexcept_setround):
	Likewise.

6 files changed, 9 insertions, 106 deletions

diff --git a/ChangeLog b/ChangeLog
index bd52e877d7..735090ef57 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,14 @@
 2018-02-01  Joseph Myers  <joseph@codesourcery.com>
 
+	* sysdeps/m68k/coldfire/fpu/math_private.h: Move to ....
+	* sysdeps/m68k/coldfire/math_private.h: ... here.
+	* sysdeps/m68k/coldfire/nofpu/math_private.h: Remove file.
+	* sysdeps/tile/math_private.h: Likewise.
+	* sysdeps/microblaze/math_private.h (libc_feholdexcept_setround):
+	Remove macro.
+	* sysdeps/nios2/math_private.h (libc_feholdexcept_setround):
+	Likewise.
+
 	* sysdeps/m68k/coldfire/nofpu/math_private.h (libc_fesetround):
 	Remove macro.
 	(libc_fetestexcept): Likewise.
diff --git a/sysdeps/m68k/coldfire/fpu/math_private.h b/sysdeps/m68k/coldfire/math_private.h
index d306a508b4..d306a508b4 100644
--- a/sysdeps/m68k/coldfire/fpu/math_private.h
+++ b/sysdeps/m68k/coldfire/math_private.h
diff --git a/sysdeps/m68k/coldfire/nofpu/math_private.h b/sysdeps/m68k/coldfire/nofpu/math_private.h
deleted file mode 100644
index 0694de971a..0000000000
--- a/sysdeps/m68k/coldfire/nofpu/math_private.h
+++ /dev/null
@@ -1,43 +0,0 @@
-/* Disable use of exceptions and rounding modes for no-FPU ColdFire.
-   Copyright (C) 2012-2018 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 COLDFIRE_NOFPU_MATH_PRIVATE_H
-#define COLDFIRE_NOFPU_MATH_PRIVATE_H 1
-
-/* Suppress use of exceptions and rounding modes here to avoid build
-   errors if the FE_* macros aren't defined.
-
-   We intentionally ignore the "exception" arguments of functions that
-   take an exception, since we can't even evaluate the argument
-   without causing a build failure.  The extra level of statement
-   expression wrapping avoids "statement with no effect" warnings.
-   Since the callers don't check for errors anyway, we just claim
-   success in every case.
-
-   The overrides for libc_ functions must happen before we include
-   the generic math_private.h.  */
-
-#define libc_feholdexcept_setround(env, exc)   ({ (void) (env); 0; })
-
-/* Enable __finitel, __isinfl, and __isnanl for binary compatibility
-   when built without long double support. */
-#define LDBL_CLASSIFY_COMPAT 1
-
-#include_next <math_private.h>
-
-#endif
diff --git a/sysdeps/microblaze/math_private.h b/sysdeps/microblaze/math_private.h
index 1d70d05b81..64dc18133f 100644
--- a/sysdeps/microblaze/math_private.h
+++ b/sysdeps/microblaze/math_private.h
@@ -1,26 +1,6 @@
 #ifndef MICROBLAZE_MATH_PRIVATE_H
 #define MICROBLAZE_MATH_PRIVATE_H 1
 
-/* Suppress use of exceptions here to avoid build errors if the FE_*
-   macros aren't definied. Only allow rounding modes implemented for
-   MicroBlaze.
-
-   This does mean that some code will silently fail to report exceptions,
-   set rounding mode as expected, etc., but it allows math code to compile
-   that otherwise wouldn't (such as math/s_fma.c) and so is valuable.
-
-   We intentionally ignore the "exception" arguments of functions that
-   take an exception, since we can't even evaluate the argument
-   without causing a build failure.  The extra level of statement
-   expression wrapping avoids "statement with no effect" warnings.
-   Since the callers don't check for errors anyway, we just claim
-   success in every case.
-
-   The overrides for libc_ functions must happen before we include
-   the generic math_private.h.  */
-
-#define libc_feholdexcept_setround(env, exc)   ({ (void) (env); 0; })
-
 /* Enable __finitel, __isinfl, and __isnanl for binary compatibility
    when built without long double support. */
 #define LDBL_CLASSIFY_COMPAT 1
diff --git a/sysdeps/nios2/math_private.h b/sysdeps/nios2/math_private.h
index 9c734fab58..bc7f9c8e90 100644
--- a/sysdeps/nios2/math_private.h
+++ b/sysdeps/nios2/math_private.h
@@ -1,25 +1,6 @@
 #ifndef NIO2_MATH_PRIVATE_H
 #define NIO2_MATH_PRIVATE_H 1
 
-/* Suppress use of exceptions here to avoid build errors if the FE_*
-   macros aren't defined. Only allow rounding modes implemented for Nios II.
-
-   This does mean that some code will silently fail to report exceptions,
-   set rounding mode as expected, etc., but it allows math code to compile
-   that otherwise wouldn't (such as math/s_fma.c) and so is valuable.
-
-   We intentionally ignore the "exception" arguments of functions that
-   take an exception, since we can't even evaluate the argument
-   without causing a build failure.  The extra level of statement
-   expression wrapping avoids "statement with no effect" warnings.
-   Since the callers don't check for errors anyway, we just claim
-   success in every case.
-
-   The overrides for libc_ functions must happen before we include
-   the generic math_private.h.  */
-
-#define libc_feholdexcept_setround(env, exc)   ({ (void) (env); 0; })
-
 /* Enable __finitel, __isinfl, and __isnanl for binary compatibility
    when built without long double support. */
 #define LDBL_CLASSIFY_COMPAT 1
diff --git a/sysdeps/tile/math_private.h b/sysdeps/tile/math_private.h
deleted file mode 100644
index 09c720469e..0000000000
--- a/sysdeps/tile/math_private.h
+++ /dev/null
@@ -1,24 +0,0 @@
-#ifndef TILE_MATH_PRIVATE_H
-#define TILE_MATH_PRIVATE_H 1
-
-/* Internally, we suppress any use of exception or rounding other
-   than what is supported by the hardware.  This does mean that some
-   code will silently fail to report exceptions, set rounding mode
-   as expected, etc., but it allows math code to compile that otherwise
-   wouldn't (such as math/s_fma.c) and so is valuable.
-
-   We intentionally ignore the "exception" arguments of functions that
-   take an exception, since we can't even evaluate the argument
-   without causing a build failure.  The extra level of statement
-   expression wrapping avoids "statement with no effect" warnings.
-   Since the callers don't check for errors anyway, we just claim
-   success in every case.
-
-   The overrides for libc_ functions must happen before we include
-   the generic math_private.h.  */
-
-#define libc_feholdexcept_setround(env, exc)	({ (void) (env); 0; })
-
-#include_next <math_private.h>
-
-#endif