[Bug target/69275] New: ICE compiling rs6000/float-128.c

["bergner at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69275

            Bug ID: 69275
           Summary: ICE compiling rs6000/float-128.c
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: bergner at gcc dot gnu.org
  Target Milestone: ---

With revision 232346 (ie, Mike Meissner's last IEEE128 patch), we're now seeing
the following ICE on powerpc64le-linux:


/home/bergner/gcc/build/gcc-fsf-mainline-cpu-supports-base/./gcc/xgcc
-B/home/bergner/gcc/build/gcc-fsf-mainline-cpu-supports-base/./gcc/
-B/home/bergner/gcc/install/gcc-fsf-mainline-cpu-supports-base/powerpc64le-linux/bin/
-B/home/bergner/gcc/install/gcc-fsf-mainline-cpu-supports-base/powerpc64le-linux/lib/
-isystem
/home/bergner/gcc/install/gcc-fsf-mainline-cpu-supports-base/powerpc64le-linux/include
-isystem
/home/bergner/gcc/install/gcc-fsf-mainline-cpu-supports-base/powerpc64le-linux/sys-include
   -g -O2 -O2  -g -O2 -DIN_GCC    -W -Wall -Wno-narrowing -Wwrite-strings
-Wcast-qual -Wno-format -Wstrict-prototypes -Wmissing-prototypes
-Wold-style-definition  -isystem ./include   -fPIC -mlong-double-128
-mno-minimal-toc -g -DIN_LIBGCC2 -fbuilding-libgcc -fno-stack-protector   -fPIC
-mlong-double-128 -mno-minimal-toc -I. -I. -I../.././gcc
-I/home/bergner/gcc/gcc-fsf-mainline-base/libgcc
-I/home/bergner/gcc/gcc-fsf-mainline-base/libgcc/.
-I/home/bergner/gcc/gcc-fsf-mainline-base/libgcc/../gcc
-I/home/bergner/gcc/gcc-fsf-mainline-base/libgcc/../include
-I/home/bergner/gcc/gcc-fsf-mainline-base/libgcc/../libdecnumber/dpd
-I/home/bergner/gcc/gcc-fsf-mainline-base/libgcc/../libdecnumber -DHAVE_CC_TLS 
-Wno-type-limits -mvsx -mfloat128 -mno-float128-hardware
-I/home/bergner/gcc/gcc-fsf-mainline-base/libgcc/soft-fp
-I/home/bergner/gcc/gcc-fsf-mainline-base/libgcc/config/rs6000  -o
float128-ifunc.o -MT float128-ifunc.o -MD -MP -MF float128-ifunc.dep  -c
/home/bergner/gcc/gcc-fsf-mainline-base/libgcc/config/rs6000/float128-ifunc.c
-fvisibility=hidden -DHIDE_EXPORTS
/home/bergner/gcc/gcc-fsf-mainline-base/libgcc/config/rs6000/float128-ifunc.c:282:8:
error: ifunc is not supported on this target
 TFtype __addkf3 (TFtype, TFtype)
        ^~~~~~~~

/home/bergner/gcc/gcc-fsf-mainline-base/libgcc/config/rs6000/float128-ifunc.c:285:8:
error: ifunc is not supported on this target
 TFtype __subkf3 (TFtype, TFtype)
        ^~~~~~~~

Mike, I assume you bootstrapped using a POWER9 enabled (ie, new) binutils when
you tested the patch.  If I use an older binutils (eg, 2.24 like on our genoa
system), then we get the error above.