ARC: build: Better way to detect ISA compatible toolchain

[cascardo/linux.git] / arch / arc / Makefile

diff --git a/arch/arc/Makefile b/arch/arc/Makefile
index aeb1902..fed12f3 100644 (file)
--- a/arch/arc/Makefile
+++ b/arch/arc/Makefile
@@ -9,7 +9,11 @@
 UTS_MACHINE := arc
 
 ifeq ($(CROSS_COMPILE),)
+ifndef CONFIG_CPU_BIG_ENDIAN
 CROSS_COMPILE := arc-linux-
+else
+CROSS_COMPILE := arceb-linux-
+endif
 endif
 
 KBUILD_DEFCONFIG := nsim_700_defconfig
@@ -18,6 +22,20 @@ cflags-y     += -fno-common -pipe -fno-builtin -D__linux__
 cflags-$(CONFIG_ISA_ARCOMPACT) += -mA7
 cflags-$(CONFIG_ISA_ARCV2)     += -mcpu=archs
 
+is_700 = $(shell $(CC) -dM -E - < /dev/null | grep -q "ARC700" && echo 1 || echo 0)
+
+ifdef CONFIG_ISA_ARCOMPACT
+ifeq ($(is_700), 0)
+    $(error Toolchain not configured for ARCompact builds)
+endif
+endif
+
+ifdef CONFIG_ISA_ARCV2
+ifeq ($(is_700), 1)
+    $(error Toolchain not configured for ARCv2 builds)
+endif
+endif
+
 ifdef CONFIG_ARC_CURR_IN_REG
 # For a global register defintion, make sure it gets passed to every file
 # We had a customer reported bug where some code built in kernel was NOT using
@@ -74,10 +92,6 @@ ldflags-$(CONFIG_CPU_BIG_ENDIAN)     += -EB
 # --build-id w/o "-marclinux". Default arc-elf32-ld is OK
 ldflags-$(upto_gcc44)                  += -marclinux
 
-ifndef CONFIG_ARC_HAS_HW_MPY
-       cflags-y        += -mno-mpy
-endif
-
 LIBGCC := $(shell $(CC) $(cflags-y) --print-libgcc-file-name)
 
 # Modules with short calls might break for calls into builtin-kernel