x86_64-zephyr-elf: fix soft float for x86 32-bit

This fixes soft-float build for x86 32-bit (-m32 -msoft-float)
under x86_64-zephyr-elf multilib build. This now actually
includes the soft float functions.

Signed-off-by: Daniel Leung <daniel.leung@intel.com>
Signed-off-by: Stephanos Ioannidis <root@stephanos.io>

Author: dcpleung

libgcc/config.host

@@ -718,7 +718,7 @@ i[34567]86-*-elf*)
 	tmake_file="$tmake_file i386/t-crtstuff t-crtstuff-pic t-libgcc-pic"
 	;;
 x86_64-zephyr-elf)
-	tmake_file="$tmake_file i386/t-crtstuff i386/64/t-zephyr64 t-dfprules"
+	tmake_file="$tmake_file i386/t-crtstuff i386/64/t-zephyr64"
 	;;
 x86_64-*-elf* | x86_64-*-rtems*)
 	tmake_file="$tmake_file i386/t-crtstuff t-crtstuff-pic t-libgcc-pic"
@@ -1571,6 +1571,13 @@ i[34567]86-*-linux* | x86_64-*-linux* | \
 esac
 
 case ${host} in
+x86_64-zephyr-elf)
+	tmake_file="${tmake_file} t-softfp-sfdf"
+	if test "${host_address}" = 32; then
+		tmake_file="${tmake_file} i386/${host_address}/t-softfp"
+	fi
+	tmake_file="${tmake_file} i386/64/t-softfp i386/t-softfp t-softfp t-dfprules"
+	;;
 i[34567]86-*-elfiamcu | i[34567]86-zephyr-elf | i[34567]86-*-rtems*)
 	# These use soft-fp for SFmode and DFmode, not just TFmode.
 	;;

libgcc/config/i386/64/t-softfp

@@ -1,6 +1,2 @@
-softfp_extras := fixhfti fixunshfti floattihf floatuntihf
-
-CFLAGS-fixhfti.c += -msse2
-CFLAGS-fixunshfti.c += -msse2
-CFLAGS-floattihf.c += -msse2
-CFLAGS-floatunstihf.c += -msse2
+softfp_wrap_start := '\#ifndef __x86_64__'
+softfp_wrap_end := '\#endif'