powerpc64: apply -mabi=ibmlongdouble to special files

Some of these files depend on the avoidance of using the various
register sets of POWER.  When enabling the IEEE 128 long double,
we must be sure to disable this ABI as some compilers will
refuse to compile if -mno-vsx and -mabi=ieeelongdouble are both
present.

Reviewed-by: Tulio Magno Quites Machado Filho <tuliom@linux.ibm.com>

sysdeps/powerpc/powerpc64/Makefile

@@ -25,6 +25,12 @@ no-special-regs := $(sort $(foreach n,40 41 50 51 60 61 62 63 \
 				    -ffixed-v$n)) \
 		   -ffixed-vrsave -ffixed-vscr -mno-altivec -mno-vsx
 
+# Likewise, we must disable IEEE long double support as some (all?)
+# compilers will not accept the above options with IEEE long double.
+ifeq ($(ibm128-fcts),yes)
+no-special-regs += -mabi=ibmlongdouble
+endif
+
 # Need to prevent gcc from using fprs in code used during dynamic linking.
 
 CFLAGS-dl-runtime.os = $(no-special-regs)

sysdeps/powerpc/powerpc64/le/Makefile

@@ -6,7 +6,8 @@
 type-ldouble-CFLAGS =
 no-gnu-attribute-CFLAGS =
 ifeq ($(ibm128-fcts),yes)
-type-ldouble-CFLAGS += -mabi=ibmlongdouble
+ibm128-abi-CFLAGS := -mabi=ibmlongdouble
+type-ldouble-CFLAGS += $(ibm128-abi-CFLAGS)
 no-gnu-attribute-CFLAGS = -mno-gnu-attribute
 endif
 

sysdeps/powerpc/powerpc64/power7/Makefile

@@ -1,7 +1,11 @@
 ifeq ($(subdir),elf)
 # Prevent the use of VSX registers and insns in _dl_start, which under -O3
 # optimization may require a TOC reference before relocations are resolved.
-CFLAGS-rtld.c += -mno-vsx
+CFLAGS-rtld.c += $(ibm128-abi-CFLAGS) -mno-vsx
+
+# Likewise, remove options to build IEEE long double
+$(foreach suf,$(all-object-suffixes),$(objpfx)rtld$(suf)): \
+  sysdep-CFLAGS := $(filter-out -mabi=ieeelongdouble,$(sysdep-CFLAGS))
 endif
 
 ifeq ($(subdir),string)