From 077d84f543b36d27d1d8aa5f759d6eed6c6a65b2 Mon Sep 17 00:00:00 2001
From: Jeremy Kerr <​jk@ozlabs.org>
Date: Sat, 12 Apr 2008 23:14:42 +0000
Subject: 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/gcc/Makefile                   | 18 ++++++++++++++++++
 toolchain/gcc/files/alternate-arch-cc.in |  3 +++
 2 files changed, 21 insertions(+)
 create mode 100644 toolchain/gcc/files/alternate-arch-cc.in

(limited to 'toolchain/gcc')

diff --git a/toolchain/gcc/Makefile b/toolchain/gcc/Makefile
index a1d1baa..875c375 100644
--- a/toolchain/gcc/Makefile
+++ b/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
diff --git a/toolchain/gcc/files/alternate-arch-cc.in b/toolchain/gcc/files/alternate-arch-cc.in
new file mode 100644
index 0000000..e169951
--- /dev/null
+++ b/toolchain/gcc/files/alternate-arch-cc.in
@@ -0,0 +1,3 @@
+#!/bin/sh
+
+exec @CC_BASE@ @EXTRA_ARCH_OPTS@ "$@"
-- 
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