[buildroot] use ext-toolchain.sh to integrate external toolchains

Use ext-toolchain.sh to wrap external toolchain commands,
abort build if certain features such as CONFIG_SOFT_FLOAT or 
CONFIG_IPV6 are enabled but not supported by the toolchain.


git-svn-id: svn://svn.openwrt.org/openwrt/trunk@29766 3c298f89-4303-0410-b956-a3cf2f4a3e73

rules.mk

@@ -148,7 +148,7 @@ ifndef DUMP
       ifneq ($(TOOLCHAIN_LIB_DIRS),)
         TARGET_LDFLAGS+= $(patsubst %,-L%,$(TOOLCHAIN_LIB_DIRS))
       endif
-      TOOLCHAIN_DIR:=$(TOOLCHAIN_ROOT_DIR)
+      TARGET_PATH:=$(TOOLCHAIN_DIR)/bin:$(TARGET_PATH)
     endif
   endif
 endif

toolchain/Makefile

@@ -28,7 +28,7 @@
 curdir:=toolchain
 
 # subdirectories to descend into
-$(curdir)/builddirs := $(if $(CONFIG_GDB),gdb) $(if $(CONFIG_INSIGHT),insight) $(if $(CONFIG_EXTERNAL_TOOLCHAIN),,kernel-headers binutils gcc/minimal gcc/initial gcc/final $(LIBC) $(if $(CONFIG_GLIBC_PORTS),glibc-ports))
+$(curdir)/builddirs := $(if $(CONFIG_GDB),gdb) $(if $(CONFIG_INSIGHT),insight) $(if $(CONFIG_EXTERNAL_TOOLCHAIN),wrapper,kernel-headers binutils gcc/minimal gcc/initial gcc/final $(LIBC) $(if $(CONFIG_GLIBC_PORTS),glibc-ports))
 $(curdir)/builddirs-compile:=$($(curdir)/builddirs-prepare)
 $(curdir)/builddirs-install:=$($(curdir)/builddirs-compile)
 

toolchain/wrapper/Makefile

@@ -0,0 +1,62 @@
+#
+# Copyright (C) 2012 OpenWrt.org
+#
+# This is free software, licensed under the GNU General Public License v2.
+# See /LICENSE for more information.
+#
+
+include $(TOPDIR)/rules.mk
+
+PKG_NAME:=wrapper
+PKG_VERSION:=1
+
+include $(INCLUDE_DIR)/toolchain-build.mk
+
+
+# 1: args
+define toolchain_util
+$(strip $(SCRIPT_DIR)/ext-toolchain.sh --toolchain $(CONFIG_TOOLCHAIN_ROOT) \
+	--cflags $(CONFIG_TARGET_OPTIMIZATION) \
+	--cflags "-muclibc $(if $(CONFIG_SOFT_FLOAT),-msoft-float)" \
+	--cflags "$(patsubst ./%,-I$(TOOLCHAIN_ROOT_DIR)/%,$(call qstrip,$(CONFIG_TOOLCHAIN_INC_PATH)))" \
+	--cflags "$(patsubst ./%,-L$(TOOLCHAIN_ROOT_DIR)/%,$(call qstrip,$(CONFIG_TOOLCHAIN_LIB_PATH)))" \
+	$(1))
+endef
+
+# 1: config symbol
+# 2: feature
+define toolchain_test
+$$(if $$($(1)), \
+	@echo -n "Testing external toolchain for $(2) support ... "; \
+	if $(call toolchain_util,--test "$(2)"); then \
+		echo "ok"; exit 0; \
+	else \
+		echo "failed"; \
+		echo "ERROR: $(1) is enabled but the external toolchain does not support it"; \
+		exit 1; \
+	fi)
+endef
+
+
+define Host/Prepare
+	$(call toolchain_test,CONFIG_SOFT_FLOAT,softfloat)
+	$(call toolchain_test,CONFIG_IPV6,ipv6)
+	$(call toolchain_test,CONFIG_NLS,wchar)
+	$(call toolchain_test,CONFIG_PACKAGE_libpthread,threads)
+endef
+
+define Host/Configure
+endef
+
+define Host/Compile
+endef
+
+define Host/Install
+	$(call toolchain_util,--wrap "$(TOOLCHAIN_DIR)/bin")
+endef
+
+define Host/Clean
+	rm -rf $(TOOLCHAIN_DIR)/bin
+endef
+
+$(eval $(call HostBuild))