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Diffstat (limited to 'toolchain/toolchain-external/ext-tool.mk')
| -rw-r--r-- | toolchain/toolchain-external/ext-tool.mk | 115 |
1 files changed, 115 insertions, 0 deletions
diff --git a/toolchain/toolchain-external/ext-tool.mk b/toolchain/toolchain-external/ext-tool.mk new file mode 100644 index 000000000..7e4645ddb --- /dev/null +++ b/toolchain/toolchain-external/ext-tool.mk @@ -0,0 +1,115 @@ + +# +# 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 $@ |