From 8dcc1087602e2dd606e4f6e81a06aee62cfd4f4c Mon Sep 17 00:00:00 2001
From: Boris Krasnovskiy <borkra@gmail.com>
Date: Sat, 9 Mar 2019 20:45:43 -0500
Subject: [PATCH] toolchain: ARM: Fix toolchain compilation for gcc 8.x

Set the toolchain's ARM CPU and FPU architectures by utilizing' gcc's
--with-cpu / --with-fpu configure options that: "Specify which cpu
variant the compiler should generate code for by default. cpu will
be used as the default value of the -mcpu= switch."

This will resolve the following kernel compilation failures under
gcc 8.x on ARM because the kernel wants to set (possibly conflicting)
optimization flags.

.../ccyVnmrs.s:204: Error: selected processor does not support `dmb ish' in ARM mode
.../ccyVnmrs.s:215: Error: architectural extension `mp' is not allowed for the current base architecture
.../ccyVnmrs.s:216: Error: selected processor does not support `pldw [r4]' in ARM mode

Because this is a big change, the .config and toolchain need to be
refreshed (as in removed and regenerated).

Reported-by: Ansuel Smith <ansuelsmth@gmail.com>
Reported-by: Daniel Engberg <daniel.engberg.lists@pyret.net> [#1203]
Signed-off-by: Boris Krasnovskiy <borkra@gmail.com>
Signed-off-by: Christian Lamparter <chunkeey@gmail.com> [extended commit message,
removed now-deprecated CPU_CFLAGS, changed author to gmail address]
---
 include/target.mk       | 20 --------------------
 toolchain/gcc/common.mk |  8 ++++++--
 2 files changed, 6 insertions(+), 22 deletions(-)

diff --git a/include/target.mk b/include/target.mk
index 1d6888fde3..5346ea1a91 100644
--- a/include/target.mk
+++ b/include/target.mk
@@ -183,26 +183,6 @@ ifeq ($(DUMP),1)
   endif
   ifneq ($(findstring arm,$(ARCH)),)
     CPU_TYPE ?= xscale
-    CPU_CFLAGS_arm920t = -mcpu=arm920t
-    CPU_CFLAGS_arm926ej-s = -mcpu=arm926ej-s
-    CPU_CFLAGS_arm1136j-s = -mcpu=arm1136j-s
-    CPU_CFLAGS_arm1176jzf-s = -mcpu=arm1176jzf-s
-    CPU_CFLAGS_cortex-a5 = -mcpu=cortex-a5
-    CPU_CFLAGS_cortex-a7 = -mcpu=cortex-a7
-    CPU_CFLAGS_cortex-a8 = -mcpu=cortex-a8
-    CPU_CFLAGS_cortex-a9 = -mcpu=cortex-a9
-    CPU_CFLAGS_cortex-a15 = -mcpu=cortex-a15
-    CPU_CFLAGS_cortex-a53 = -mcpu=cortex-a53
-    CPU_CFLAGS_cortex-a72 = -mcpu=cortex-a72
-    CPU_CFLAGS_fa526 = -mcpu=fa526
-    CPU_CFLAGS_mpcore = -mcpu=mpcore
-    CPU_CFLAGS_xscale = -mcpu=xscale
-    ifeq ($(CONFIG_SOFT_FLOAT),)
-      CPU_CFLAGS_neon = -mfpu=neon
-      CPU_CFLAGS_vfp = -mfpu=vfp
-      CPU_CFLAGS_vfpv3 = -mfpu=vfpv3-d16
-      CPU_CFLAGS_neon-vfpv4 = -mfpu=neon-vfpv4
-    endif
   endif
   ifeq ($(ARCH),powerpc)
     CPU_CFLAGS_603e:=-mcpu=603e
diff --git a/toolchain/gcc/common.mk b/toolchain/gcc/common.mk
index 4bc8b20271..6e8767f707 100644
--- a/toolchain/gcc/common.mk
+++ b/toolchain/gcc/common.mk
@@ -161,9 +161,13 @@ ifneq ($(GCC_ARCH),)
   GCC_CONFIGURE+= --with-arch=$(GCC_ARCH)
 endif
 
-ifneq ($(CONFIG_SOFT_FLOAT),y)
-  ifeq ($(CONFIG_arm),y)
+ifeq ($(CONFIG_arm),y)
+  GCC_CONFIGURE+= \
+	--with-cpu=$(word 1, $(subst +," ,$(CONFIG_CPU_TYPE)))
+
+  ifneq ($(CONFIG_SOFT_FLOAT),y)
     GCC_CONFIGURE+= \
+		--with-fpu=$(word 2, $(subst +, ",$(CONFIG_CPU_TYPE))) \
 		--with-float=hard
   endif
 endif