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+
+#
+# This file implements the support for external toolchains, i.e
+# toolchains that have not been produced by Buildroot itself and that
+# are already available on the system on which Buildroot runs. So far,
+# we have tested this with:
+#
+# * Toolchains generated by Crosstool-NG
+# * Toolchains generated by Buildroot
+# * ARM, MIPS and PowerPC toolchains made available by
+# Codesourcery. For the MIPS toolchain, the -muclibc variant isn't
+# supported yet, only the default glibc-based variant is.
+#
+# The basic principle is the following
+#
+# 1. Perform some checks on the conformity between the toolchain
+# configuration described in the Buildroot menuconfig system, and the
+# real configuration of the external toolchain. This is for example
+# important to make sure that the Buildroot configuration system
+# knows whether the toolchain supports RPC, IPv6, locales, large
+# files, etc. Unfortunately, these things cannot be detected
+# automatically, since the value of these options (such as
+# BR2_INET_RPC) are needed at configuration time because these
+# options are used as dependencies for other options. And at
+# configuration time, we are not able to retrieve the external
+# toolchain configuration.
+#
+# 2. Copy the libraries needed at runtime to the target directory,
+# $(TARGET_DIR). Obviously, things such as the C library, the dynamic
+# loader and a few other utility libraries are needed if dynamic
+# applications are to be executed on the target system.
+#
+# 3. Copy the libraries and headers to the staging directory. This
+# will allow all further calls to gcc to be made using --sysroot
+# $(STAGING_DIR), which greatly simplifies the compilation of the
+# packages when using external toolchains. So in the end, only the
+# cross-compiler binaries remains external, all libraries and headers
+# are imported into the Buildroot tree.
+
+uclibc: dependencies $(STAMP_DIR)/ext-toolchain-installed
+
+LIB_EXTERNAL_LIBS=ld*.so libc.so libcrypt.so libdl.so libgcc_s.so libm.so libnsl.so libresolv.so librt.so libutil.so
+ifeq ($(BR2_TOOLCHAIN_EXTERNAL_GLIBC),y)
+LIB_EXTERNAL_LIBS+=libnss_files.so libnss_dns.so
+endif
+
+ifeq ($(BR2_INSTALL_LIBSTDCPP),y)
+USR_LIB_EXTERNAL_LIBS+=libstdc++.so
+endif
+
+ifneq ($(BR2_PTHREADS_NONE),y)
+LIB_EXTERNAL_LIBS+=libpthread.so
+ifeq ($(BR2_PACKAGE_GDB_SERVER),y)
+LIB_EXTERNAL_LIBS+=libthread_db.so
+endif # gdbserver
+endif # ! no threads
+
+# SYSROOT_DIR selection. We first try the -print-sysroot option,
+# available in gcc 4.4.x and in some Codesourcery toolchains. If this
+# option is not available, we fallback to the value of --with-sysroot
+# as visible in CROSS-gcc -v. We don't pass any option to gcc that
+# could select a multilib variant as we want the "main" sysroot, which
+# contains all variants of the C library in the case of multilib
+# toolchains.
+TARGET_CC_NO_SYSROOT=$(filter-out --sysroot=%,$(TARGET_CC))
+SYSROOT_DIR=$(shell $(TARGET_CC_NO_SYSROOT) -print-sysroot 2>/dev/null)
+ifeq ($(SYSROOT_DIR),)
+SYSROOT_DIR=$(shell readlink -f $$(LANG=C $(TARGET_CC_NO_SYSROOT) -print-file-name=libc.a) |sed -r -e 's:usr/lib/libc\.a::;')
+endif
+
+# Now, find if the toolchain specifies a sub-directory for the
+# specific architecture variant we're interested in. This is the case
+# with multilib toolchain, when the selected architecture variant is
+# not the default one. To do so, we ask the compiler by passing all
+# flags, except the --sysroot flag since we want to the compiler to
+# tell us where its original sysroot is. ARCH_SUBDIR will contain the
+# subdirectory, in the main SYSROOT_DIR, that corresponds to the
+# selected architecture variant. ARCH_SYSROOT_DIR will contain the
+# full path to this location.
+ARCH_SUBDIR=$(shell $(TARGET_CC_NO_SYSROOT) $(TARGET_CFLAGS) -print-multi-directory)
+ARCH_SYSROOT_DIR=$(SYSROOT_DIR)/$(ARCH_SUBDIR)
+
+$(STAMP_DIR)/ext-toolchain-installed:
+ @echo "Checking external toolchain settings"
+ $(Q)$(call check_cross_compiler_exists)
+ifeq ($(strip $(SYSROOT_DIR)),)
+ @echo "External toolchain doesn't support --sysroot. Cannot use."
+ exit 1
+endif
+ifeq ($(BR2_arm),y)
+ $(Q)$(call check_arm_abi)
+endif
+ifeq ($(BR2_INSTALL_LIBSTDCPP),y)
+ $(Q)$(call check_cplusplus)
+endif
+ifeq ($(BR2_TOOLCHAIN_EXTERNAL_UCLIBC),y)
+ $(Q)$(call check_uclibc,$(SYSROOT_DIR))
+else
+ $(Q)$(call check_glibc,$(SYSROOT_DIR))
+endif
+ mkdir -p $(TARGET_DIR)/lib
+ @echo "Copy external toolchain libraries to target..."
+ $(Q)for libs in $(LIB_EXTERNAL_LIBS); do \
+ $(call copy_toolchain_lib_root,$(ARCH_SYSROOT_DIR),$$libs,/lib,$(BR2_TOOLCHAIN_EXTERNAL_STRIP)); \
+ done
+ $(Q)for libs in $(USR_LIB_EXTERNAL_LIBS); do \
+ $(call copy_toolchain_lib_root,$(ARCH_SYSROOT_DIR),$$libs,/usr/lib,$(BR2_TOOLCHAIN_EXTERNAL_STRIP)); \
+ done
+ @echo "Copy external toolchain sysroot to staging..."
+ $(Q)$(call copy_toolchain_sysroot,$(SYSROOT_DIR),$(ARCH_SYSROOT_DIR),$(ARCH_SUBDIR))
+ # Create lib64 symbolic links if needed
+ $(Q)if [ -L $(ARCH_SYSROOT_DIR)/lib64 ] ; then \
+ $(call create_lib64_symlinks) ; \
+ fi
+ @touch $@