[09/13] powerpc64le: workaround ieee long double / _Float128 stdc++ bug

Message ID 20200306203721.15886-10-murphyp@linux.vnet.ibm.com
State New
Headers show
Series
  • Enable IEEE binary128 long double on powerpc64le
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Commit Message

Paul E. Murphy March 6, 2020, 8:37 p.m.
-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.
---
 sysdeps/powerpc/powerpc64/le/Makefile | 11 +++++++++++
 1 file changed, 11 insertions(+)

-- 
2.21.1

Patch

diff --git a/sysdeps/powerpc/powerpc64/le/Makefile b/sysdeps/powerpc/powerpc64/le/Makefile
index 8c92331b4d..5171ad5036 100644
--- a/sysdeps/powerpc/powerpc64/le/Makefile
+++ b/sysdeps/powerpc/powerpc64/le/Makefile
@@ -193,3 +193,14 @@  $(foreach suf,$(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