Make powerpc-nofpu __sqrtsf2, __sqrtdf2 compat symbols (bug 18473).

powerpc-nofpu libc exports __sqrtsf2 and __sqrtdf2 symbols.  The
export of these soft-fp symbols is a mistake; they aren't part of the
libgcc interface and GCC will never generate code that calls them.
This patch makes them into compat symbols (no code built for static
libc), moving their sources from the generic soft-fp sources to
sysdeps/powerpc/nofpu (the underlying soft-fp FP_SQRT functionality
remains of use to implement actual sqrt public interfaces, such as
sqrtl / sqrtf128 for which it is used on various platforms, but
__sqrt[sdt]f2 are not such interfaces).

Tested with build-many-glibcs.py for relevant platforms.

	[BZ #18473]
	* soft-fp/sqrttf2.c: Remove file.
	* soft-fp/sqrtdf2.c: Move to ....
	* sysdeps/powerpc/nofpu/sqrtdf2.c: ... here.  Include
	<shlib-compat.h>.
	(__sqrtdf2): Make conditional on
	[SHLIB_COMPAT (libc, GLIBC_2_3_2, GLIBC_2_28)].  Define as compat
	symbol.
	* soft-fp/sqrtsf2.c: Move to ....
	* sysdeps/powerpc/nofpu/sqrtsf2.c: ... here.  Include
	<shlib-compat.h>.
	(__sqrtsf2): Make conditional on
	[SHLIB_COMPAT (libc, GLIBC_2_3_2, GLIBC_2_28)].  Define as compat
	symbol.
	* soft-fp/Makefile (gcc-single-routines): Remove sqrtsf2.
	(gcc-double-routines): Remove sqrtdf2.
	(gcc-quad-routines): Remove sqrttf2.
	* sysdeps/nios2/Makefile [$(subdir) = soft-fp] (sysdep_routines):
	Do not filter out sqrtsf2 and sqrtdf2.
	* sysdeps/powerpc/nofpu/Makefile [$(subdir) = soft-fp]
	(sysdep_routines): Add sqrtsf2 and sqrtdf2.

ChangeLog

@@ -1,3 +1,27 @@
+2018-06-01  Joseph Myers  <joseph@codesourcery.com>
+
+	[BZ #18473]
+	* soft-fp/sqrttf2.c: Remove file.
+	* soft-fp/sqrtdf2.c: Move to ....
+	* sysdeps/powerpc/nofpu/sqrtdf2.c: ... here.  Include
+	<shlib-compat.h>.
+	(__sqrtdf2): Make conditional on
+	[SHLIB_COMPAT (libc, GLIBC_2_3_2, GLIBC_2_28)].  Define as compat
+	symbol.
+	* soft-fp/sqrtsf2.c: Move to ....
+	* sysdeps/powerpc/nofpu/sqrtsf2.c: ... here.  Include
+	<shlib-compat.h>.
+	(__sqrtsf2): Make conditional on
+	[SHLIB_COMPAT (libc, GLIBC_2_3_2, GLIBC_2_28)].  Define as compat
+	symbol.
+	* soft-fp/Makefile (gcc-single-routines): Remove sqrtsf2.
+	(gcc-double-routines): Remove sqrtdf2.
+	(gcc-quad-routines): Remove sqrttf2.
+	* sysdeps/nios2/Makefile [$(subdir) = soft-fp] (sysdep_routines):
+	Do not filter out sqrtsf2 and sqrtdf2.
+	* sysdeps/powerpc/nofpu/Makefile [$(subdir) = soft-fp]
+	(sysdep_routines): Add sqrtsf2 and sqrtdf2.
+
 2018-06-01  Florian Weimer  <fweimer@redhat.com>
 
 	* sysdeps/generic/libcidn.abilist: Remove file.

soft-fp/Makefile

@@ -25,16 +25,16 @@ include ../Makeconfig
 
 gcc-single-routines := negsf2 addsf3 subsf3 mulsf3 divsf3 eqsf2 \
 	lesf2 gesf2 unordsf2 fixsfsi fixunssfsi floatsisf fixsfdi        \
-	fixunssfdi floatdisf sqrtsf2 floatunsisf floatundisf
+	fixunssfdi floatdisf floatunsisf floatundisf
 
 gcc-double-routines := negdf2 adddf3 subdf3 muldf3 divdf3 eqdf2 \
 	ledf2 gedf2 unorddf2 fixdfsi fixunsdfsi floatsidf fixdfdi        \
-	fixunsdfdi floatdidf extendsfdf2 truncdfsf2 sqrtdf2 floatunsidf \
+	fixunsdfdi floatdidf extendsfdf2 truncdfsf2 floatunsidf \
 	floatundidf
 
 gcc-quad-routines := negtf2 addtf3 subtf3 multf3 divtf3 eqtf2 \
 	letf2 getf2 unordtf2 fixtfsi fixunstfsi floatsitf fixtfdi      \
 	fixunstfdi floatditf extendsftf2 trunctfsf2 extenddftf2 \
-	trunctfdf2 sqrttf2 floatunsitf floatunditf
+	trunctfdf2 floatunsitf floatunditf
 
 include ../Rules

soft-fp/sqrttf2.c

@@ -1,49 +0,0 @@
-/* Software floating-point emulation.
-   Return sqrt(a)
-   Copyright (C) 1997-2018 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-   Contributed by Richard Henderson (rth@cygnus.com) and
-		  Jakub Jelinek (jj@ultra.linux.cz).
-
-   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.
-
-   In addition to the permissions in the GNU Lesser General Public
-   License, the Free Software Foundation gives you unlimited
-   permission to link the compiled version of this file into
-   combinations with other programs, and to distribute those
-   combinations without any restriction coming from the use of this
-   file.  (The Lesser General Public License restrictions do apply in
-   other respects; for example, they cover modification of the file,
-   and distribution when not linked into a combine executable.)
-
-   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/>.  */
-
-#include "soft-fp.h"
-#include "quad.h"
-
-TFtype
-__sqrttf2 (TFtype a)
-{
-  FP_DECL_EX;
-  FP_DECL_Q (A);
-  FP_DECL_Q (R);
-  TFtype r;
-
-  FP_INIT_ROUNDMODE;
-  FP_UNPACK_Q (A, a);
-  FP_SQRT_Q (R, A);
-  FP_PACK_Q (r, R);
-  FP_HANDLE_EXCEPTIONS;
-
-  return r;
-}

sysdeps/nios2/Makefile

@@ -22,8 +22,7 @@ pic-ccflag = -fpic
 long-double-fcts = no
 
 ifeq ($(subdir),soft-fp)
-sysdep_routines += $(filter-out sqrtsf2,$(gcc-single-routines)) \
+sysdep_routines += $(gcc-single-routines) $(gcc-double-routines)
-  $(filter-out sqrtdf2,$(gcc-double-routines))
 endif
 
 ifeq ($(subdir),csu)

sysdeps/powerpc/nofpu/Makefile

@@ -2,6 +2,7 @@
 
 ifeq ($(subdir),soft-fp)
 sysdep_routines += $(gcc-single-routines) $(gcc-double-routines) \
+		   sqrtsf2 sqrtdf2 \
 		   sim-full atomic-feholdexcept atomic-feclearexcept \
 		   atomic-feupdateenv flt-rounds
 endif

sysdeps/powerpc/nofpu/sqrtdf2.c

@@ -30,7 +30,9 @@
 
 #include "soft-fp.h"
 #include "double.h"
+#include <shlib-compat.h>
 
+#if SHLIB_COMPAT (libc, GLIBC_2_3_2, GLIBC_2_28)
 DFtype
 __sqrtdf2 (DFtype a)
 {
@@ -47,3 +49,5 @@ __sqrtdf2 (DFtype a)
 
   return r;
 }
+compat_symbol (libc, __sqrtdf2, __sqrtdf2, GLIBC_2_3_2);
+#endif

sysdeps/powerpc/nofpu/sqrtsf2.c

@@ -30,7 +30,9 @@
 
 #include "soft-fp.h"
 #include "single.h"
+#include <shlib-compat.h>
 
+#if SHLIB_COMPAT (libc, GLIBC_2_3_2, GLIBC_2_28)
 SFtype
 __sqrtsf2 (SFtype a)
 {
@@ -47,3 +49,5 @@ __sqrtsf2 (SFtype a)
 
   return r;
 }
+compat_symbol (libc, __sqrtsf2, __sqrtsf2, GLIBC_2_3_2);
+#endif