From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <murphyp@sourceware.org>
Received: by sourceware.org (Postfix, from userid 1968)
 id 2C09B3947C11; Mon,  6 Apr 2020 15:56:39 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 2C09B3947C11
Content-Type: text/plain; charset="us-ascii"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
From: Paul E. Murphy <murphyp@sourceware.org>
To: glibc-cvs@sourceware.org
Subject: [glibc] powerpc64le: workaround ieee long double / _Float128 stdc++
 bug
X-Act-Checkin: glibc
X-Git-Author: Paul E. Murphy <murphyp@linux.vnet.ibm.com>
X-Git-Refname: refs/heads/master
X-Git-Oldrev: 6f82d05034178eee756dfe09472948130748ad39
X-Git-Newrev: 8e72163b16bfe874a415a558f78911e5d05c5f22
Message-Id: <20200406155639.2C09B3947C11@sourceware.org>
Date: Mon,  6 Apr 2020 15:56:39 +0000 (GMT)
X-BeenThere: glibc-cvs@sourceware.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Glibc-cvs mailing list <glibc-cvs.sourceware.org>
List-Unsubscribe: <http://sourceware.org/mailman/options/glibc-cvs>,
 <mailto:glibc-cvs-request@sourceware.org?subject=unsubscribe>
List-Archive: <https://sourceware.org/pipermail/glibc-cvs/>
List-Help: <mailto:glibc-cvs-request@sourceware.org?subject=help>
List-Subscribe: <http://sourceware.org/mailman/listinfo/glibc-cvs>,
 <mailto:glibc-cvs-request@sourceware.org?subject=subscribe>
X-List-Received-Date: Mon, 06 Apr 2020 15:56:39 -0000

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=8e72163b16bfe874a415a558f78911e5d05c5f22

commit 8e72163b16bfe874a415a558f78911e5d05c5f22
Author: Paul E. Murphy <murphyp@linux.vnet.ibm.com>
Date:   Fri Feb 7 14:08:20 2020 -0600

    powerpc64le: workaround ieee long double / _Float128 stdc++ bug
    
    -mabi=ieeelongdouble triggers the stdc++ libraries _Float128
    support, which then breaks if algorithm is included.  For now,
    explicitly disable _Float128 for such tests.
    
    I have opened up GCC BZ 94080 to track this.
    
    Reviewed-by: Tulio Magno Quites Machado Filho <tuliom@linux.ibm.com>

Diff:
---
 sysdeps/powerpc/powerpc64/le/Makefile | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/sysdeps/powerpc/powerpc64/le/Makefile b/sysdeps/powerpc/powerpc64/le/Makefile
index 441a8a14e5..96834d3e2b 100644
--- a/sysdeps/powerpc/powerpc64/le/Makefile
+++ b/sysdeps/powerpc/powerpc64/le/Makefile
@@ -140,3 +140,14 @@ $(foreach suf,$(all-object-suffixes), $(ldbl-ibm128-files)) \
 	  $(foreach r,$(ldbl-128ibm-routines) $(ldbl-tests), \
 		    $(objpfx)$(r)$(suf)): \
   sysdep-CFLAGS := $(filter-out -mabi=ieeelongdouble,$(sysdep-CFLAGS))
+
+# TODO: a bug in stdc++ will fail if -mabi=ieeelongdouble and -mfloat128
+# are both enabled.  The latter is enabled by default in GCC 8+.  This is
+# tracked via GCC BZ 94080.
+ifeq ($(subdir),support)
+CFLAGS-links-dso-program.cc += -mno-float128
+endif
+ifeq ($(subdir),nptl)
+CFLAGS-tst-thread_local1.cc += -mno-float128
+CFLAGS-tst-minstack-throw.cc += -mno-float128
+endif