provide a cleaner way to specify a biarch toolchain build

Currently, to build a biarch toolchain, we need to explicitly give
options to the binutils and gcc configure commands:

CONFIG_EXTRA_BINUTILS_CONFIG_OPTIONS="--enable-targets=powerpc64-linux-uclibc"
CONFIG_EXTRA_GCC_CONFIG_OPTIONS="--enable-biarch --enable-targets=powerpc64-linux-uclibc"

This change replaces the command line options with an 'extra arch'
configure option:

CONFIG_EXTRA_TARGET_ARCH=y
CONFIG_EXTRA_TARGET_ARCH_NAME="powerpc64"

And a way to invoke this extra arch on the compiler command-line:

CONFIG_EXTRA_TARGET_ARCH_OPTS="-m64"

In this case, this results in an extra compiler:
 'powerpc64-linux-uclibc-gcc', which invokes
 'powerpc-linux-uclibc-gcc -m64'

This is a more standard way of building biarch toolchains, and allows
the packages to not have to care about how to invoke the 64-bit
compiler.

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>

SVN-Revision: 10802

toolchain/Config.in

@@ -10,6 +10,35 @@ menuconfig TOOLCHAINOPTS
 	bool "Toolchain Options" if DEVEL
 	depends !NATIVE_TOOLCHAIN
 
+menuconfig EXTRA_TARGET_ARCH
+	bool
+	prompt "Enable an extra toolchain target architecture" if TOOLCHAINOPTS
+	default n
+	help
+	  Some builds may require a 'biarch' toolchain. This option
+	  allows you to specify an additional target arch.
+
+	  Most people will answer N here.
+
+	config EXTRA_TARGET_ARCH_NAME
+		string
+		prompt "Extra architecture name" if EXTRA_TARGET_ARCH
+		help
+		  Specify the cpu name (eg powerpc64 or x86_64) of the
+		  additional target architecture.
+
+	config EXTRA_TARGET_ARCH_OPTS
+		string
+		prompt "Extra architecture compiler options" if EXTRA_TARGET_ARCH
+		help
+		  If you're specifying an addition target architecture,
+		  you'll probably need to also provide options to make
+		  the compiler use this alternate arch.
+
+		  For example, if you're building a compiler that can build
+		  both powerpc and powerpc64 binaries, you'll need to
+		  specify -m64 here.
+
 source "toolchain/binutils/Config.in"
 source "toolchain/gcc/Config.in"
 source "toolchain/uClibc/Config.in"

toolchain/binutils/Makefile

@@ -24,6 +24,8 @@ BUILD_DIR_HOST:=$(BUILD_DIR_TOOLCHAIN)
 
 include $(INCLUDE_DIR)/host-build.mk
 
+EXTRA_TARGET=$(if $(CONFIG_EXTRA_TARGET_ARCH),--enable-targets=$(call qstrip,$(CONFIG_EXTRA_TARGET_ARCH_NAME))-linux-uclibc)
+
 define Build/Configure
 	$(CP) $(SCRIPT_DIR)/config.{guess,sub} $(PKG_BUILD_DIR)/
 	(cd $(PKG_BUILD_DIR); \
@@ -34,6 +36,7 @@ define Build/Configure
 		--target=$(REAL_GNU_TARGET_NAME) \
 		--disable-werror \
 		--disable-nls \
+		$(EXTRA_TARGET) \
 		$(SOFT_FLOAT_CONFIG_OPTION) \
 		$(call qstrip,$(CONFIG_EXTRA_BINUTILS_CONFIG_OPTIONS)) \
 	);

toolchain/gcc/Makefile

@@ -40,6 +40,8 @@ BUILD_DIR2:=$(BUILD_DIR_HOST)/gcc-$(PKG_VERSION)-final
 SEP:=,
 TARGET_LANGUAGES:="c$(if $(CONFIG_INSTALL_LIBSTDCPP),$(SEP)c++)$(if $(CONFIG_INSTALL_LIBGCJ),$(SEP)java)"
 
+EXTRA_TARGET=$(if $(CONFIG_EXTRA_TARGET_ARCH),--enable-biarch --enable-targets=$(call qstrip,$(CONFIG_EXTRA_TARGET_ARCH_NAME))-linux-uclibc)
+
 define Stage1/Configure
 	$(SED) 's,TARGET_CROSS=.*,TARGET_CROSS=$(REAL_GNU_TARGET_NAME)-,' $(TOOLCHAIN_DIR)/info.mk
 	$(SED) 's,GCC_VERSION=.*,GCC_VERSION=$(PKG_VERSION),' $(TOOLCHAIN_DIR)/info.mk
@@ -60,6 +62,7 @@ define Stage1/Configure
 		--disable-nls \
 		--disable-libmudflap \
 		--disable-multilib \
+		$(EXTRA_TARGET) \
 		$(SOFT_FLOAT_CONFIG_OPTION) \
 		$(call qstrip,$(CONFIG_EXTRA_GCC_CONFIG_OPTIONS)) \
 	);
@@ -93,6 +96,7 @@ define Stage2/Configure
 		--disable-nls \
 		--disable-libmudflap \
 		--disable-multilib \
+		$(EXTRA_TARGET) \
 		$(SOFT_FLOAT_CONFIG_OPTION) \
 		$(call qstrip,$(CONFIG_EXTRA_GCC_CONFIG_OPTIONS)) \
 	);
@@ -102,6 +106,19 @@ define Stage2/Compile
 	export SHELL="\$(BASH)"; \$(MAKE) -C \$(BUILD_DIR2) all
 endef
 
+define SetupExtraArch
+	for app in $(TOOLCHAIN_DIR)/bin/$(OPTIMIZE_FOR_CPU)*-{gcc,gcc-*,g++}; do \
+		[ -e $$$$app ] || continue; \
+		old_base=$$$$(basename $$$$app); \
+		new_base=$(call qstrip,$(CONFIG_EXTRA_TARGET_ARCH_NAME))-$$$${old_base##$(OPTIMIZE_FOR_CPU)-}; \
+		sed -e "s/@CC_BASE@/$$$$old_base/" \
+			-e 's/@EXTRA_ARCH_OPTS@/$(call qstrip,$(CONFIG_EXTRA_TARGET_ARCH_OPTS))/' \
+			 ./files/alternate-arch-cc.in > \
+			 $(TOOLCHAIN_DIR)/bin/$$$$new_base; \
+		chmod a+x $(TOOLCHAIN_DIR)/bin/$$$$new_base; \
+	done
+endef
+
 define Stage2/Install
 	$(MAKE) -C $(BUILD_DIR2) \
 		SHELL="$(BASH)" \
@@ -116,6 +133,7 @@ define Stage2/Install
 		   	$(GNU_TARGET_NAME)$$$${app##$(REAL_GNU_TARGET_NAME)}; \
 		done; \
 	);
+	$(if $(CONFIG_EXTRA_TARGET_ARCH),$(call SetupExtraArch))
 endef
 
 define Build/Prepare

toolchain/gcc/files/alternate-arch-cc.in

@@ -0,0 +1,3 @@
+#!/bin/sh
+
+exec @CC_BASE@ @EXTRA_ARCH_OPTS@ "$@"