#
# This file implements the support for external toolchains, i.e
# toolchains that have not been produced by Buildroot itself and that
# Buildroot can download from the Web or 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. a. For toolchains downloaded from the Web, Buildroot already
# knows their configuration, so it just downloads them and extract
# them in $(TOOLCHAIN_EXTERNAL_DIR).
#
# 1. b. For pre-installed toolchains, 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.
#
# 4. Build a toolchain wrapper which executes the external toolchain
# with a number of arguments (sysroot/march/mtune/..) hardcoded,
# so we're sure the correct configuration is always used and the
# toolchain behaves similar to an internal toolchain.
# This toolchain wrapper and symlinks are installed into
# $(HOST_DIR)/usr/bin like for the internal toolchains, and the rest
# of Buildroot is handled identical for the 2 toolchain types.
uclibc: dependencies $(HOST_DIR)/usr/bin/ext-toolchain-wrapper
LIB_EXTERNAL_LIBS=ld*.so libc.so libcrypt.so libdl.so libgcc_s.so libm.so libnsl.so libresolv.so librt.so libutil.so
ifeq ($(BR2_TOOLCHAIN_EXTERNAL_GLIBC),y)
LIB_EXTERNAL_LIBS+=libnss_files.so libnss_dns.so
endif
ifeq ($(BR2_INSTALL_LIBSTDCPP),y)
USR_LIB_EXTERNAL_LIBS+=libstdc++.so
endif
ifeq ($(BR2_TOOLCHAIN_HAS_THREADS),y)
LIB_EXTERNAL_LIBS+=libpthread.so
ifeq ($(BR2_PACKAGE_GDB_SERVER),y)
LIB_EXTERNAL_LIBS+=libthread_db.so
endif # gdbserver
endif # ! no threads
# Details about sysroot directory selection.
#
# To find the sysroot directory:
#
# * We first try the -print-sysroot option, available in gcc 4.4.x
# and in some Codesourcery toolchains.
#
# * If this option is not available, we fallback to the value of
# --with-sysroot as visible in CROSS-gcc -v.
#
# When doing those tests, we don't pass any option to gcc that could
# select a multilib variant (such as -march) as we want the "main"
# sysroot, which contains all variants of the C library in the case of
# multilib toolchains. We use the TARGET_CC_NO_SYSROOT variable, which
# is the path of the cross-compiler, without the
# --sysroot=$(STAGING_DIR), since what we want to find is the location
# of the original toolchain sysroot. This "main" sysroot directory is
# stored in SYSROOT_DIR.
#
# Then, multilib toolchains are a little bit more complicated, since
# they in fact have multiple sysroots, one for each variant supported
# by the toolchain. So we need to find the particular sysroot we're
# interested in.
#
# To do so, we ask the compiler where its sysroot is by passing all
# flags (including -march and al.), 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.
#
# One might wonder why we don't just bother with ARCH_SYSROOT_DIR. The
# fact is that in multilib toolchains, the header files are often only
# present in the main sysroot, and only the libraries are available in
# each variant-specific sysroot directory.
TOOLCHAIN_EXTERNAL_PREFIX=$(call qstrip,$(BR2_TOOLCHAIN_EXTERNAL_PREFIX))
ifeq ($(BR2_TOOLCHAIN_EXTERNAL_DOWNLOAD),y)
TOOLCHAIN_EXTERNAL_DIR=$(HOST_DIR)/opt/ext-toolchain
else
TOOLCHAIN_EXTERNAL_DIR=$(call qstrip,$(BR2_TOOLCHAIN_EXTERNAL_PATH))
endif
ifeq ($(TOOLCHAIN_EXTERNAL_DIR),)
# if no path set, figure it out from path
TOOLCHAIN_EXTERNAL_BIN:=$(shell dirname $(shell which $(TOOLCHAIN_EXTERNAL_PREFIX)-gcc))
else
TOOLCHAIN_EXTERNAL_BIN:=$(TOOLCHAIN_EXTERNAL_DIR)/bin
endif
TOOLCHAIN_EXTERNAL_CROSS=$(TOOLCHAIN_EXTERNAL_BIN)/$(TOOLCHAIN_EXTERNAL_PREFIX)-
TOOLCHAIN_EXTERNAL_CC=$(TOOLCHAIN_EXTERNAL_CROSS)gcc
TOOLCHAIN_EXTERNAL_CXX=$(TOOLCHAIN_EXTERNAL_CROSS)g++
TOOLCHAIN_EXTERNAL_WRAPPER_ARGS = \
-DBR_CROSS_PATH='"$(TOOLCHAIN_EXTERNAL_BIN)/"' \
-DBR_SYSROOT='"$(STAGING_DIR)"'
CC_TARGET_TUNE_:=$(call qstrip,$(BR2_GCC_TARGET_TUNE))
CC_TARGET_ARCH_:=$(call qstrip,$(BR2_GCC_TARGET_ARCH))
CC_TARGET_ABI_:=$(call qstrip,$(BR2_GCC_TARGET_ABI))
# march/mtune/floating point mode needs to be passed to the external toolchain
# to select the right multilib variant
ifneq ($(CC_TARGET_TUNE_),)
TOOLCHAIN_EXTERNAL_CFLAGS += -mtune=$(CC_TARGET_TUNE_)
TOOLCHAIN_EXTERNAL_WRAPPER_ARGS += -DBR_TUNE='"$(CC_TARGET_TUNE_)"'
endif
ifneq ($(CC_TARGET_ARCH_),)
TOOLCHAIN_EXTERNAL_CFLAGS += -march=$(CC_TARGET_ARCH_)
TOOLCHAIN_EXTERNAL_WRAPPER_ARGS += -DBR_ARCH='"$(CC_TARGET_ARCH_)"'
endif
ifneq ($(CC_TARGET_ABI_),)
TOOLCHAIN_EXTERNAL_CFLAGS += -mabi=$(CC_TARGET_ABI_)
TOOLCHAIN_EXTERNAL_WRAPPER_ARGS += -DBR_ABI='"$(CC_TARGET_ABI_)"'
endif
ifeq ($(BR2_SOFT_FLOAT),y)
TOOLCHAIN_EXTERNAL_CFLAGS += -msoft-float
TOOLCHAIN_EXTERNAL_WRAPPER_ARGS += -DBR_SOFTFLOAT=1
endif
ifeq ($(BR2_VFP_FLOAT),y)
TOOLCHAIN_EXTERNAL_CFLAGS += -mfpu=vfp
TOOLCHAIN_EXTERNAL_WRAPPER_ARGS += -DBR_VFPFLOAT=1
endif
ifeq ($(BR2_TOOLCHAIN_EXTERNAL_DOWNLOAD),y)
TOOLCHAIN_EXTERNAL_DEPENDENCIES = $(TOOLCHAIN_EXTERNAL_DIR)/.extracted
else
TOOLCHAIN_EXTERNAL_DEPENDENCIES = $(STAMP_DIR)/ext-toolchain-checked
endif
ifeq ($(BR2_TOOLCHAIN_EXTERNAL_CODESOURCERY_ARM2009Q1),y)
TOOLCHAIN_EXTERNAL_SITE=http://www.codesourcery.com/sgpp/lite/arm/portal/package4571/public/arm-none-linux-gnueabi/
TOOLCHAIN_EXTERNAL_SOURCE=arm-2009q1-203-arm-none-linux-gnueabi-i686-pc-linux-gnu.tar.bz2
else ifeq ($(BR2_TOOLCHAIN_EXTERNAL_CODESOURCERY_ARM2009Q3),y)
TOOLCHAIN_EXTERNAL_SITE=http://www.codesourcery.com/sgpp/lite/arm/portal/package5383/public/arm-none-linux-gnueabi/
TOOLCHAIN_EXTERNAL_SOURCE=arm-2009q3-67-arm-none-linux-gnueabi-i686-pc-linux-gnu.tar.bz2
else ifeq ($(BR2_TOOLCHAIN_EXTERNAL_CODESOURCERY_ARM2010Q1),y)
TOOLCHAIN_EXTERNAL_SITE=http://www.codesourcery.com/sgpp/lite/arm/portal/package6488/public/arm-none-linux-gnueabi/
TOOLCHAIN_EXTERNAL_SOURCE=arm-2010q1-202-arm-none-linux-gnueabi-i686-pc-linux-gnu.tar.bz2
else ifeq ($(BR2_TOOLCHAIN_EXTERNAL_CODESOURCERY_ARM201009),y)
TOOLCHAIN_EXTERNAL_SITE=http://www.codesourcery.com/sgpp/lite/arm/portal/package7851/public/arm-none-linux-gnueabi/
TOOLCHAIN_EXTERNAL_SOURCE=arm-2010.09-50-arm-none-linux-gnueabi-i686-pc-linux-gnu.tar.bz2
else ifeq ($(BR2_TOOLCHAIN_EXTERNAL_CODESOURCERY_ARM201103),y)
TOOLCHAIN_EXTERNAL_SITE=http://www.codesourcery.com/sgpp/lite/arm/portal/package8739/public/arm-none-linux-gnueabi/
TOOLCHAIN_EXTERNAL_SOURCE=arm-2011.03-41-arm-none-linux-gnueabi-i686-pc-linux-gnu.tar.bz2
else ifeq ($(BR2_TOOLCHAIN_EXTERNAL_CODESOURCERY_MIPS44),y)
TOOLCHAIN_EXTERNAL_SITE=http://www.codesourcery.com/sgpp/lite/mips/portal/package7401/public/mips-linux-gnu/
TOOLCHAIN_EXTERNAL_SOURCE=mips-4.4-303-mips-linux-gnu-i686-pc-linux-gnu.tar.bz2
else ifeq ($(BR2_TOOLCHAIN_EXTERNAL_CODESOURCERY_MIPS201103),y)
TOOLCHAIN_EXTERNAL_SITE=http://www.codesourcery.com/sgpp/lite/mips/portal/package8715/public/mips-linux-gnu/
TOOLCHAIN_EXTERNAL_SOURCE=mips-2011.03-53-mips-linux-gnu-i686-pc-linux-gnu.tar.bz2
else ifeq ($(BR2_TOOLCHAIN_EXTERNAL_CODESOURCERY_POWERPC201009),y)
TOOLCHAIN_EXTERNAL_SITE=http://www.codesourcery.com/sgpp/lite/power/portal/package7703/public/powerpc-linux-gnu/
TOOLCHAIN_EXTERNAL_SOURCE=freescale-2010.09-55-powerpc-linux-gnu-i686-pc-linux-gnu.tar.bz2
else ifeq ($(BR2_TOOLCHAIN_EXTERNAL_CODESOURCERY_SH201009),y)
TOOLCHAIN_EXTERNAL_SITE=http://www.codesourcery.com/sgpp/lite/superh/portal/package7783/public/sh-linux-gnu/
TOOLCHAIN_EXTERNAL_SOURCE=renesas-2010.09-45-sh-linux-gnu-i686-pc-linux-gnu.tar.bz2
else
# A value must be set (even if unused), otherwise the
# $(DL_DIR)/$(TOOLCHAIN_EXTERNAL_SOURCE) rule would override the main
# $(DL_DIR) rule
TOOLCHAIN_EXTERNAL_SOURCE=none
endif
# Download and extraction of a toolchain
$(DL_DIR)/$(TOOLCHAIN_EXTERNAL_SOURCE):
$(call DOWNLOAD,$(TOOLCHAIN_EXTERNAL_SITE),$(TOOLCHAIN_EXTERNAL_SOURCE))
$(TOOLCHAIN_EXTERNAL_DIR)/.extracted: $(DL_DIR)/$(TOOLCHAIN_EXTERNAL_SOURCE)
mkdir -p $(@D)
$(INFLATE$(suffix $(TOOLCHAIN_EXTERNAL_SOURCE))) $^ | $(TAR) $(TAR_STRIP_COMPONENTS)=1 -C $(@D) $(TAR_OPTIONS) -
$(Q)touch $@
# Checks for an already installed toolchain: check the toolchain
# location, check that it supports sysroot, and then verify that it
# matches the configuration provided in Buildroot: ABI, C++ support,
# type of C library and all C library features.
$(STAMP_DIR)/ext-toolchain-checked:
@echo "Checking external toolchain settings"
$(Q)$(call check_cross_compiler_exists,$(TOOLCHAIN_EXTERNAL_CC))
$(Q)SYSROOT_DIR=`$(TOOLCHAIN_EXTERNAL_CC) -print-sysroot 2>/dev/null` ; \
if test -z "$${SYSROOT_DIR}" ; then \
SYSROOT_DIR=`readlink -f $$(LANG=C $(TOOLCHAIN_EXTERNAL_CC) -print-file-name=libc.a) |sed -r -e 's:usr/lib/libc\.a::;'` ; \
fi ; \
if test -z "$${SYSROOT_DIR}" ; then \
@echo "External toolchain doesn't support --sysroot. Cannot use." ; \
exit 1 ; \
fi ; \
if test x$(BR2_arm) == x"y" ; then \
$(call check_arm_abi,$(TOOLCHAIN_EXTERNAL_CC)) ; \
fi ; \
if test x$(BR2_INSTALL_LIBSTDCPP) == x"y" ; then \
$(call check_cplusplus,$(TOOLCHAIN_EXTERNAL_CXX)) ; \
fi ; \
if test x$(BR2_TOOLCHAIN_EXTERNAL_UCLIBC) == x"y" ; then \
$(call check_uclibc,$${SYSROOT_DIR}) ; \
else \
$(call check_glibc,$${SYSROOT_DIR}) ; \
fi
$(Q)touch $@
# Integration of the toolchain into Buildroot: find the main sysroot
# and the variant-specific sysroot, then copy the needed libraries to
# the $(TARGET_DIR) and copy the whole sysroot (libraries and headers)
# to $(STAGING_DIR).
$(STAMP_DIR)/ext-toolchain-installed: $(TOOLCHAIN_EXTERNAL_DEPENDENCIES)
$(Q)SYSROOT_DIR=`$(TOOLCHAIN_EXTERNAL_CC) -print-sysroot 2>/dev/null` ; \
if test -z "$${SYSROOT_DIR}" ; then \
SYSROOT_DIR=`readlink -f $$(LANG=C $(TOOLCHAIN_EXTERNAL_CC) -print-file-name=libc.a) |sed -r -e 's:usr/lib/libc\.a::;'` ; \
fi ; \
if test -z "$${SYSROOT_DIR}" ; then \
@echo "External toolchain doesn't support --sysroot. Cannot use." ; \
exit 1 ; \
fi ; \
ARCH_SUBDIR=`$(TOOLCHAIN_EXTERNAL_CC) $(TOOLCHAIN_EXTERNAL_CFLAGS) -print-multi-directory` ; \
ARCH_SYSROOT_DIR=$${SYSROOT_DIR}/$${ARCH_SUBDIR} ; \
mkdir -p $(TARGET_DIR)/lib ; \
echo "Copy external toolchain libraries to target..." ; \
for libs in $(LIB_EXTERNAL_LIBS); do \
$(call copy_toolchain_lib_root,$${ARCH_SYSROOT_DIR},$$libs,/lib); \
done ; \
for libs in $(USR_LIB_EXTERNAL_LIBS); do \
$(call copy_toolchain_lib_root,$${ARCH_SYSROOT_DIR},$$libs,/usr/lib); \
done ; \
echo "Copy external toolchain sysroot to staging..." ; \
$(call copy_toolchain_sysroot,$${SYSROOT_DIR},$${ARCH_SYSROOT_DIR},$${ARCH_SUBDIR}) ; \
if [ -L $${ARCH_SYSROOT_DIR}/lib64 ] ; then \
$(call create_lib64_symlinks) ; \
fi ; \
touch $@
# Build toolchain wrapper for preprocessor, C and C++ compiler, and setup
# symlinks for everything else
$(HOST_DIR)/usr/bin/ext-toolchain-wrapper: $(STAMP_DIR)/ext-toolchain-installed
mkdir -p $(HOST_DIR)/usr/bin; cd $(HOST_DIR)/usr/bin; \
for i in $(TOOLCHAIN_EXTERNAL_CROSS)*; do \
case "$$i" in \
*cc|*cc-*|*++|*++-*|*cpp) \
base=$${i##*/}; \
ln -sf $(@F) $$base; \
;; \
*) \
ln -sf $$i .; \
;; \
esac; \
done ;
$(HOSTCC) $(HOST_CFLAGS) $(TOOLCHAIN_EXTERNAL_WRAPPER_ARGS) -s \
toolchain/toolchain-external/ext-toolchain-wrapper.c -o $@
