2019-01-29  Ramana Radhakrishnan  <ramana.radhakrishnan@arm.com>

	PR target/89093
	* config/arm/arm-cpus.in: Add -mfpu=none support.
	* config/arm/arm-tables.opt: Likewise.
	* config/arm/arm.c (arm_options_perform_arch_sanity_checks): Remove
	error for no FPU.

	* config/arm/pr-support.c: Add #pragma GCC target ("fpu=none").
	* config/arm/unwind-arm.c: Likewise.
	* unwind-c.c: Likewise, #ifdef __arm__ only.

	* libsupc++/eh_personality.cc: Add #pragma GCC target ("fpu=none")
	for __arm__.

--- gcc/config/arm/arm-cpus.in
+++ gcc/config/arm/arm-cpus.in
@@ -128,6 +128,7 @@ define feature cmse
 
 # Floating point and Neon extensions.
 # VFPv1 is not supported in GCC.
+define feature nofp
 
 # Vector floating point v2.
 define feature vfpv2
@@ -258,6 +259,7 @@ define fgroup ARMv8m_main ARMv7m armv8 cmse
 define fgroup ARMv8r      ARMv8a
 
 # Useful combinations.
+define fgroup NONE	nofp
 define fgroup VFPv2	vfpv2
 define fgroup VFPv3	VFPv2 vfpv3
 define fgroup VFPv4	VFPv3 vfpv4 fp16conv
@@ -1394,6 +1396,9 @@ end cpu cortex-r52
 # begin fpu <name>
 #   isa <isa-flags-list>
 # end fpu <name>
+begin fpu none
+isa NONE FP_DBL
+end fpu none
 
 begin fpu vfp
  isa VFPv2 FP_DBL
--- gcc/config/arm/arm-tables.opt
+++ gcc/config/arm/arm-tables.opt
@@ -353,6 +353,9 @@ Enum
 Name(arm_fpu) Type(enum fpu_type)
 Known ARM FPUs (for use with the -mfpu= option):
 
+EnumValue
+Enum(arm_fpu) String(none) Value(TARGET_FPU_none)
+
 EnumValue
 Enum(arm_fpu) String(vfp) Value(TARGET_FPU_vfp)
 
--- gcc/config/arm/arm.c
+++ gcc/config/arm/arm.c
@@ -3759,8 +3759,6 @@ arm_options_perform_arch_sanity_checks (void)
       else if (TARGET_HARD_FLOAT_ABI)
 	{
 	  arm_pcs_default = ARM_PCS_AAPCS_VFP;
-	  if (!bitmap_bit_p (arm_active_target.isa, isa_bit_vfpv2))
-	    error ("-mfloat-abi=hard: selected processor lacks an FPU");
 	}
       else
 	arm_pcs_default = ARM_PCS_AAPCS;
--- libgcc/config/arm/pr-support.c
+++ libgcc/config/arm/pr-support.c
@@ -21,6 +21,8 @@
    see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
    <http://www.gnu.org/licenses/>.  */
 
+#pragma GCC target ("fpu=none")
+
 #include "unwind.h"
 
 /* We add a prototype for abort here to avoid creating a dependency on
--- libgcc/config/arm/unwind-arm.c
+++ libgcc/config/arm/unwind-arm.c
@@ -21,6 +21,8 @@
    see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
    <http://www.gnu.org/licenses/>.  */
 
+#pragma GCC target ("fpu=none")
+
 #include "unwind.h"
 
 /* Misc constants.  */
--- libgcc/unwind-c.c
+++ libgcc/unwind-c.c
@@ -24,6 +24,10 @@ a copy of the GCC Runtime Library Except
 see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
 <http://www.gnu.org/licenses/>.  */
 
+#ifdef __arm__
+#pragma GCC target ("fpu=none")
+#endif
+
 #include "tconfig.h"
 #include "tsystem.h"
 #include "auto-target.h"
--- libstdc++-v3/libsupc++/eh_personality.cc
+++ libstdc++-v3/libsupc++/eh_personality.cc
@@ -22,6 +22,10 @@
 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
 // <http://www.gnu.org/licenses/>.
 
+#ifdef __arm__
+#pragma GCC target ("fpu=none")
+#endif
+
 #include <bits/c++config.h>
 #include <cstdlib>
 #include <bits/exception_defines.h>