toolchain: add support of ARC architecture

This includes binutils, gcc, gdb and uClibc-ng.

Latest release of ARC gcc (as of today it is "arc-2015.06")
is based on upstream gcc 4.8.4.

Sources are available on GitHub, see:
https://github.com/foss-for-synopsys-dwc-arc-processors/gcc

Latest release of ARC binutils (as of today it is "arc-2015.06")
is based on upstream binutils 2.23.

Sources are available on GitHub, see:
https://github.com/foss-for-synopsys-dwc-arc-processors/binutils-gdb/releases/tag/arc-2015.06

Latest release of ARC GDB (as of today this is "arc-2015.06-gdb")
is based on upstream gdb 7.9.1.

Sources are available on GitHub, see:
https://github.com/foss-for-synopsys-dwc-arc-processors/binutils-gdb/releases/tag/arc-2015.06-gdb

Note that for binutils and gdb that come from unified git repository
(which is the case for upstream binutils/gdb today) we need to disable
building of gdb in binutils and binutils in gdb hence in binutils:
------>8------
--disable-sim
--disable-gdb
------>8------

and in gdb:
------>8------
--disable-binutils
--disable-ld
--disable-gas
------>8------

Also in gdb we disable sim because if the following breakage while
building with it:
------------>8------------
/usr/bin/env bash ./../common/genmloop.sh -shell /usr/bin/env bash \
        -mono -fast -pbb -switch sem5-switch.c \
        -cpu a5f -infile ./mloop5.in \
        -outfile-suffix 5
unknown option: bash
Makefile:699: recipe for target 'stamp-5mloop' failed
make[7]: *** [stamp-5mloop] Error 1
------------>8------------

Cc: Felix Fietkau <nbd@openwrt.org>
Cc: John Crispin <blogic@openwrt.org>
Cc: Jonas Gorski <jogo@openwrt.org>
Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@47438 3c298f89-4303-0410-b956-a3cf2f4a3e73

3 files changed, 53 insertions, 16 deletions

diff --git a/toolchain/binutils/Config.in b/toolchain/binutils/Config.in
index 27b2ffab8b..4fa8ab94ca 100644
--- a/toolchain/binutils/Config.in
+++ b/toolchain/binutils/Config.in
@@ -2,15 +2,25 @@
 
 choice
 	prompt "Binutils Version" if TOOLCHAINOPTS
-	default BINUTILS_VERSION_LINARO
+	default BINUTILS_USE_VERSION_2_24_LINARO if !arc
+	default BINUTILS_USE_VERSION_2_23_ARC if arc
 	help
 	  Select the version of binutils you wish to use.
 
-	config BINUTILS_VERSION_LINARO
+	config BINUTILS_USE_VERSION_2_24_LINARO
+		depends on !arc
 		bool "Linaro binutils 2.24"
+		select BINUTILS_VERSION_2_24_LINARO
 
-	config BINUTILS_VERSION_2_25_1
+	config BINUTILS_USE_VERSION_2_25_1
+		depends on !arc
 		bool "Binutils 2.25.1"
+		select BINUTILS_VERSION_2_25_1
+
+	config BINUTILS_USE_VERSION_2_23_ARC
+		depends on arc
+		bool "ARC binutils 2.23"
+		select BINUTILS_VERSION_2_23_ARC
 
 endchoice
 
@@ -20,10 +30,3 @@ config EXTRA_BINUTILS_CONFIG_OPTIONS
 	default ""
 	help
 	    Any additional binutils options you may want to include....
-
-config BINUTILS_VERSION
-	string
-	prompt "Binutils Version" if (TOOLCHAINOPTS && NULL)
-	default "linaro"          if BINUTILS_VERSION_LINARO
-	default "2.25.1"          if BINUTILS_VERSION_2_25_1
-	default "linaro"
diff --git a/toolchain/binutils/Config.version b/toolchain/binutils/Config.version
new file mode 100644
index 0000000000..0a57c17813
--- /dev/null
+++ b/toolchain/binutils/Config.version
@@ -0,0 +1,17 @@
+config BINUTILS_VERSION_2_24_LINARO
+	default y if (!TOOLCHAINOPTS && !arc)
+	bool
+
+config BINUTILS_VERSION_2_25_1
+	bool
+
+config BINUTILS_VERSION_2_23_ARC
+	default y if (!TOOLCHAINOPTS && arc)
+	bool
+
+config BINUTILS_VERSION
+	string
+	default "2.24-linaro"          if BINUTILS_VERSION_2_24_LINARO
+	default "2.25.1"               if BINUTILS_VERSION_2_25_1
+	default "arc-2015.06"          if BINUTILS_VERSION_2_23_ARC
+
diff --git a/toolchain/binutils/Makefile b/toolchain/binutils/Makefile
index 0028a02d68..c37148eedd 100644
--- a/toolchain/binutils/Makefile
+++ b/toolchain/binutils/Makefile
@@ -10,6 +10,13 @@ PKG_NAME:=binutils
 PKG_VERSION:=$(call qstrip,$(CONFIG_BINUTILS_VERSION))
 BIN_VERSION:=$(PKG_VERSION)
 
+PKG_SOURCE_URL:=@GNU/binutils/
+PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.bz2
+
+ifeq ($(PKG_VERSION),2.25.1)
+  PKG_MD5SUM:=ac493a78de4fee895961d025b7905be4
+endif
+
 ifeq ($(findstring linaro, $(CONFIG_BINUTILS_VERSION)),linaro)
   PKG_SOURCE_URL:=https://releases.linaro.org/14.09/components/toolchain/binutils-linaro/
   PKG_REV:=2.24.0-2014.09
@@ -17,13 +24,15 @@ ifeq ($(findstring linaro, $(CONFIG_BINUTILS_VERSION)),linaro)
   PKG_MD5SUM:=8f9b2b2e049d59b1b86ce9657802a353
   BINUTILS_DIR:=$(PKG_NAME)-linaro-$(PKG_REV)
   HOST_BUILD_DIR:=$(BUILD_DIR_TOOLCHAIN)/$(BINUTILS_DIR)
-else
-  PKG_SOURCE_URL:=@GNU/binutils/
-  PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.bz2
+endif
 
-  ifeq ($(PKG_VERSION),2.25.1)
-    PKG_MD5SUM:=ac493a78de4fee895961d025b7905be4
-  endif
+ifneq ($(CONFIG_BINUTILS_VERSION_2_23_ARC),)
+  PKG_SOURCE_URL:=https://github.com/foss-for-synopsys-dwc-arc-processors/binutils-gdb/archive/arc-2015.06/
+  PKG_REV:=2015.06
+  PKG_SOURCE:=$(PKG_NAME)-arc-$(PKG_REV).tar.gz
+  PKG_MD5SUM:=961a3564de857238c255c381f8e4360b
+  BINUTILS_DIR:=$(PKG_NAME)-gdb-arc-$(PKG_REV)
+  HOST_BUILD_DIR:=$(BUILD_DIR_TOOLCHAIN)/$(BINUTILS_DIR)
 endif
 
 HOST_BUILD_PARALLEL:=1
@@ -46,6 +55,8 @@ BINUTILS_CONFIGURE:= \
 		--disable-multilib \
 		--disable-werror \
 		--disable-nls \
+		--disable-sim \
+		--disable-gdb \
 		$(GRAPHITE_CONFIGURE) \
 		$(SOFT_FLOAT_CONFIG_OPTION) \
 		$(call qstrip,$(CONFIG_EXTRA_BINUTILS_CONFIG_OPTIONS)) 
@@ -91,6 +102,12 @@ define Host/Install
 	$(call FixupLibdir,$(TOOLCHAIN_DIR)/initial)
 	$(RM) $(TOOLCHAIN_DIR)/initial/lib/libiberty.a
 	$(CP) $(TOOLCHAIN_DIR)/bin/$(REAL_GNU_TARGET_NAME)-readelf $(REAL_STAGING_DIR_HOST)/bin/readelf
+	# ARC gcc requires extlib.
+	# If extlib is not available in "initial" folder
+	# initial gcc will fail to build libc.
+	if [ -d $(TOOLCHAIN_DIR)/extlib ]; then \
+		$(CP) -r $(TOOLCHAIN_DIR)/extlib $(TOOLCHAIN_DIR)/initial/; \
+	fi
 endef
 
 define Host/Clean