Of course it would be helpful, if I included the patch:
2018-01-12 Michael Meissner <meiss...@linux.vnet.ibm.com>
* config.gcc (powerpc*-linux*-*): Add support for 64-bit little
endian Linux systems to optionally enable multilibs for selecting
the long double type if the user configured an explicit type.
* config/rs6000/rs6000.h (TARGET_IEEEQUAD_MULTILIB): Indicate we
have no long double multilibs if not defined.
* config/rs6000/rs6000.c (rs6000_option_override_internal): Do not
warn if the user used -mabi={ieee,ibm}longdouble and we built
multilibs for long double.
* config/rs6000/linux64.h (MULTILIB_DEFAULTS_IEEE): Define as the
appropriate multilib option.
(MULTILIB_DEFAULTS): Add MULTILIB_DEFAULTS_IEEE to the default
multilib options.
* config/rs6000/t-ldouble-linux64le-ibm: New configuration files
for building long double multilibs.
* config/rs6000/t-ldouble-linux64le-ieee: Likewise.
--
Michael Meissner, IBM
IBM, M/S 2506R, 550 King Street, Littleton, MA 01460-6245, USA
email: meiss...@linux.vnet.ibm.com, phone: +1 (978) 899-4797
Index: gcc/config.gcc
===================================================================
--- gcc/config.gcc (revision 256552)
+++ gcc/config.gcc (working copy)
@@ -4408,6 +4408,16 @@ case "${target}" in
elif test x$with_long_double_format = xibm; then
tm_defines="${tm_defines} TARGET_IEEEQUAD_DEFAULT=0"
fi
+
+ case "${target}:${enable_multilib}:${with_long_double_format}"
in
+ powerpc64le*:yes:ieee | powerpc64le*:yes:ibm)
+ tm_defines="${tm_defines} TARGET_IEEEQUAD_MULTILIB=1"
+ tmake_file="${tmake_file}
rs6000/t-ldouble-linux64le-${with_long_double_format}"
+ ;;
+ *)
+ :
+ ;;
+ esac
;;
s390*-*-*)
Index: gcc/config/rs6000/rs6000.h
===================================================================
--- gcc/config/rs6000/rs6000.h (revision 256552)
+++ gcc/config/rs6000/rs6000.h (working copy)
@@ -564,6 +564,12 @@ extern int rs6000_vector_align[];
#define TARGET_ALTIVEC_ABI rs6000_altivec_abi
#define TARGET_LDBRX (TARGET_POPCNTD || rs6000_cpu == PROCESSOR_CELL)
+/* Define as 1 if we support multilibs for switching long double between IEEE
+ 128-bit floating point and IBM extended double. */
+#ifndef TARGET_IEEEQUAD_MULTILIB
+#define TARGET_IEEEQUAD_MULTILIB 0
+#endif
+
/* ISA 2.01 allowed FCFID to be done in 32-bit, previously it was 64-bit only.
Enable 32-bit fcfid's on any of the switches for newer ISA machines or
XILINX. */
Index: gcc/config/rs6000/rs6000.c
===================================================================
--- gcc/config/rs6000/rs6000.c (revision 256552)
+++ gcc/config/rs6000/rs6000.c (working copy)
@@ -4600,11 +4600,15 @@ rs6000_option_override_internal (bool gl
systems will also set long double to be IEEE 128-bit. AIX and Darwin
explicitly redefine TARGET_IEEEQUAD and TARGET_IEEEQUAD_DEFAULT to 0, so
those systems will not pick up this default. Warn if the user changes the
- default unless -Wno-psabi. */
+ default unless either the user used the -Wno-psabi option, or the compiler
+ was built to enable multilibs to switch between the two long double
+ types. */
if (!global_options_set.x_rs6000_ieeequad)
rs6000_ieeequad = TARGET_IEEEQUAD_DEFAULT;
- else if (rs6000_ieeequad != TARGET_IEEEQUAD_DEFAULT &&
TARGET_LONG_DOUBLE_128)
+ else if (!TARGET_IEEEQUAD_MULTILIB
+ && rs6000_ieeequad != TARGET_IEEEQUAD_DEFAULT
+ && TARGET_LONG_DOUBLE_128)
{
static bool warned_change_long_double;
if (!warned_change_long_double)
Index: gcc/config/rs6000/linux64.h
===================================================================
--- gcc/config/rs6000/linux64.h (revision 256552)
+++ gcc/config/rs6000/linux64.h (working copy)
@@ -245,11 +245,18 @@ extern int dot_symbols;
#define DYNAMIC_LINKER_PREFIX ""
#endif
-#undef MULTILIB_DEFAULTS
+#if TARGET_IEEEQUAD_DEFAULT
+#define MULTILIB_DEFAULTS_IEEE "mabi=ieeelongdouble"
+
+#else /* TARGET_IEEEQUAD_DEFAULT. */
+#define MULTILIB_DEFAULTS_IEEE "mabi=ibmlongdouble"
+#endif /* TARGET_IEEEQUAD_DEFAULT. */
+
+#undef MULTILIB_DEFAULTS
#if DEFAULT_ARCH64_P
-#define MULTILIB_DEFAULTS { "m64" }
+#define MULTILIB_DEFAULTS { "m64", MULTILIB_DEFAULTS_IEEE }
#else
-#define MULTILIB_DEFAULTS { "m32" }
+#define MULTILIB_DEFAULTS { "m32", MULTILIB_DEFAULTS_IEEE }
#endif
/* Split stack is only supported for 64 bit, and requires glibc >= 2.18. */
Index: gcc/config/rs6000/t-ldouble-linux64le-ibm
===================================================================
--- gcc/config/rs6000/t-ldouble-linux64le-ibm (nonexistent)
+++ gcc/config/rs6000/t-ldouble-linux64le-ibm (working copy)
@@ -0,0 +1,26 @@
+# Long double multilib libraries for PowerPC 64-bit little endian systems using
+# IBM extended double as the long double type.
+#
+# Copyright (C) 2018 Free Software Foundation, Inc.
+#
+# This file is part of GCC.
+#
+# GCC is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3, or (at your option)
+# any later version.
+#
+# GCC 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 General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with GCC; see the file COPYING3. If not see
+# <http://www.gnu.org/licenses/>.
+
+MULTILIB_OPTIONS += mabi=ieeelongdouble/mabi=ibmlongdouble
+MULTILIB_DIRNAMES += ieee128 ibm128
+MULTILIB_OSDIRNAMES += mabi.ibmlongdouble=../lib64$(call
if_multiarch,:powerpc64-linux-gnu) \
+ mabi.ieeelongdouble=../lib64/ieee128$(call
if_multiarch,:powerpc64-linux-gnu) \
+ ../lib64$(call if_multiarch,:powerpc64-linux-gnu)
Index: gcc/config/rs6000/t-ldouble-linux64le-ieee
===================================================================
--- gcc/config/rs6000/t-ldouble-linux64le-ieee (nonexistent)
+++ gcc/config/rs6000/t-ldouble-linux64le-ieee (working copy)
@@ -0,0 +1,26 @@
+# Long double multilib libraries for PowerPC 64-bit little endian systems using
+# IEEE 128-bit floating point as the long double type.
+#
+# Copyright (C) 2018 Free Software Foundation, Inc.
+#
+# This file is part of GCC.
+#
+# GCC is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3, or (at your option)
+# any later version.
+#
+# GCC 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 General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with GCC; see the file COPYING3. If not see
+# <http://www.gnu.org/licenses/>.
+
+MULTILIB_OPTIONS += mabi=ieeelongdouble/mabi=ibmlongdouble
+MULTILIB_DIRNAMES += ieee128 ibm128
+MULTILIB_OSDIRNAMES += mabi.ibmlongdouble=../lib64/ibm128$(call
if_multiarch,:powerpc64-linux-gnu) \
+ mabi.ieeelongdouble=../lib64$(call
if_multiarch,:powerpc64-linux-gnu) \
+ ../lib64$(call if_multiarch,:powerpc64-linux-gnu)
