Support building using an external toolchain. Questions to the mailing list and all other comments to <biteme@devnull.com>.

2 files changed, 128 insertions, 0 deletions

diff --git a/toolchain/external-toolchain/Config.in b/toolchain/external-toolchain/Config.in
new file mode 100644
index 000000000..c004175cd
--- /dev/null
+++ b/toolchain/external-toolchain/Config.in
@@ -0,0 +1,72 @@
+#
+
+menu "Toolchain Options"
+	depends on BR2_TOOLCHAIN_EXTERNAL
+
+config BR2_TOOLCHAIN_EXTERNAL_LIB_C
+	string "The core C library from the external toolchain"
+	default "libc.so.6"
+	help
+	  Specify the core C shared library found in the external
+	  toolchain. This is required in addition to any other
+	  libraries to be copied.
+
+config BR2_TOOLCHAIN_EXTERNAL_LIBS
+	string "Libraries to copy from the external toolchain"
+	default ""
+	help
+	  A space separated list of the shared libraries to be copied
+	  from the external toolchain into the root filesystem. Only
+	  the top-level name is needed, i.e. libc.so, libpthread.so as
+	  the actual shared library symlinked to will be copied also.
+
+config BR2_TOOLCHAIN_EXTERNAL_STRIP
+        bool
+        default y
+        prompt "Strip shared libraries"
+	help
+	  Strip shared libraries copied from the external toolchain.
+
+source "toolchain/gdb/Config.in.2"
+
+comment "Common Toolchain Options"
+
+config BR2_TOOLCHAIN_EXTERNAL_PATH
+	string "External toolchain path"
+	default ""
+	help
+	  Path to where the external toolchain is installed.
+
+config BR2_TOOLCHAIN_EXTERNAL_PREFIX
+	string "External toolchain prefix"
+	default ""
+	help
+	  This the the external toolchain prefix. For example:
+	    armeb-unknown-linux-gnu, mipsel-unknown-linux-gnu, etc.
+
+config BR2_LARGEFILE
+	bool "Enable large file (files > 2 GB) support?"
+	depends on !BR2_cris
+	default y
+	help
+	  Enable large file (files > 2 GB) support
+
+config BR2_SOFT_FLOAT
+	bool "Use software floating point by default"
+	default n
+	depends on BR2_arm || BR2_armeb || BR2_mips || BR2_mipsel || BR2_powerpc
+	help
+	  If your target CPU does not have a Floating Point Unit (FPU) or a
+	  kernel FPU emulator, but you still wish to support floating point
+	  functions, then everything will need to be compiled with soft
+	  floating point support (-msoft-float).
+
+	  Most people will answer N.
+
+config BR2_TARGET_OPTIMIZATION
+	string "Target Optimizations"
+	default "-Os -pipe"
+	help
+	  Optimizations to use when building for the target host.
+
+endmenu
diff --git a/toolchain/external-toolchain/ext-tool.mk b/toolchain/external-toolchain/ext-tool.mk
new file mode 100644
index 000000000..ab4cbef6c
--- /dev/null
+++ b/toolchain/external-toolchain/ext-tool.mk
@@ -0,0 +1,56 @@
+#
+# copy_toolchain_lib_root
+#
+# $1: source
+# $2: destination
+# $2: strip (y|n)	default is to strip
+#
+copy_toolchain_lib_root =									\
+	LIB="$(strip $1)";									\
+	DST="$(strip $2)";									\
+	STRIP="$(strip $3)";									\
+												\
+	LIB_DIR=`$(TARGET_CC) -print-file-name=$${LIB} | sed -e "s,/$${LIB}\$$,,"`;		\
+												\
+	if test -z "$${LIB_DIR}"; then								\
+		echo "copy_toolchain_lib_root: lib=$${LIB} not found";				\
+		exit -1;									\
+	fi;											\
+												\
+	LIB="$(strip $1)";									\
+	for FILE in `find $${LIB_DIR} -type l -name "$${LIB}*" -maxdepth 1`; do			\
+		LIB=`basename $${FILE}`;							\
+		while test \! -z "$${LIB}"; do							\
+			echo "copy_toolchain_lib_root lib=$${LIB} dst=$${DST}";			\
+			rm -fr $(TARGET_DIR)$${DST}/$${LIB};					\
+			mkdir -p $(TARGET_DIR)$${DST};						\
+			if test -h $${LIB_DIR}/$${LIB}; then					\
+				cp -d $${LIB_DIR}/$${LIB} $(TARGET_DIR)$${DST}/;			\
+			elif test -f $${LIB_DIR}/$${LIB}; then					\
+				cp $${LIB_DIR}/$${LIB} $(TARGET_DIR)$${DST}/$${LIB};	\
+				case "$${STRIP}" in						\
+				(0 | n | no)							\
+					;;							\
+				(*)								\
+					$(TARGET_CROSS)strip "$(TARGET_DIR)$${DST}/$${LIB}";		\
+					;;							\
+				esac;								\
+			else									\
+				exit -1;							\
+			fi;									\
+			LIB="`readlink $${LIB_DIR}/$${LIB}`";					\
+		done;										\
+	done;											\
+												\
+	echo -n
+
+uclibc: dependencies $(TARGET_DIR)/lib/$(strip $(subst ",, $(BR2_TOOLCHAIN_EXTERNAL_LIB_C)))
+
+$(TARGET_DIR)/lib/$(strip $(subst ",, $(BR2_TOOLCHAIN_EXTERNAL_LIB_C))):
+#"))
+	mkdir -p $(TARGET_DIR)/lib
+	@$(call copy_toolchain_lib_root, $(strip $(subst ",, $(BR2_TOOLCHAIN_EXTERNAL_LIB_C))), /lib, $(BR2_TOOLCHAIN_EXTERNAL_STRIP))
+#")))
+	for libs in $(strip $(subst ",, $(BR2_TOOLCHAIN_EXTERNAL_LIBS))) ; do \
+		$(call copy_toolchain_lib_root, $$libs, /lib, $(BR2_TOOLCHAIN_EXTERNAL_STRIP)) ; \
+	done