f78ea9fcf0
Rename the external toolchain directory. When new backends are here, it will be easier to sort them out if they are all prefixed the same way. Signed-off-by: Yann E. MORIN <yann.morin.1998@anciens.enib.fr> Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
116 lines
4.9 KiB
Makefile
116 lines
4.9 KiB
Makefile
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#
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# This file implements the support for external toolchains, i.e
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# toolchains that have not been produced by Buildroot itself and that
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# are already available on the system on which Buildroot runs. So far,
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# we have tested this with:
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#
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# * Toolchains generated by Crosstool-NG
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# * Toolchains generated by Buildroot
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# * ARM, MIPS and PowerPC toolchains made available by
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# Codesourcery. For the MIPS toolchain, the -muclibc variant isn't
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# supported yet, only the default glibc-based variant is.
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#
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# The basic principle is the following
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#
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# 1. Perform some checks on the conformity between the toolchain
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# configuration described in the Buildroot menuconfig system, and the
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# real configuration of the external toolchain. This is for example
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# important to make sure that the Buildroot configuration system
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# knows whether the toolchain supports RPC, IPv6, locales, large
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# files, etc. Unfortunately, these things cannot be detected
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# automatically, since the value of these options (such as
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# BR2_INET_RPC) are needed at configuration time because these
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# options are used as dependencies for other options. And at
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# configuration time, we are not able to retrieve the external
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# toolchain configuration.
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#
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# 2. Copy the libraries needed at runtime to the target directory,
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# $(TARGET_DIR). Obviously, things such as the C library, the dynamic
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# loader and a few other utility libraries are needed if dynamic
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# applications are to be executed on the target system.
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#
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# 3. Copy the libraries and headers to the staging directory. This
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# will allow all further calls to gcc to be made using --sysroot
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# $(STAGING_DIR), which greatly simplifies the compilation of the
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# packages when using external toolchains. So in the end, only the
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# cross-compiler binaries remains external, all libraries and headers
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# are imported into the Buildroot tree.
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uclibc: dependencies $(STAMP_DIR)/ext-toolchain-installed
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LIB_EXTERNAL_LIBS=ld*.so libc.so libcrypt.so libdl.so libgcc_s.so libm.so libnsl.so libresolv.so librt.so libutil.so
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ifeq ($(BR2_TOOLCHAIN_EXTERNAL_GLIBC),y)
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LIB_EXTERNAL_LIBS+=libnss_files.so libnss_dns.so
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endif
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ifeq ($(BR2_INSTALL_LIBSTDCPP),y)
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USR_LIB_EXTERNAL_LIBS+=libstdc++.so
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endif
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ifneq ($(BR2_PTHREADS_NONE),y)
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LIB_EXTERNAL_LIBS+=libpthread.so
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ifeq ($(BR2_PACKAGE_GDB_SERVER),y)
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LIB_EXTERNAL_LIBS+=libthread_db.so
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endif # gdbserver
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endif # ! no threads
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# SYSROOT_DIR selection. We first try the -print-sysroot option,
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# available in gcc 4.4.x and in some Codesourcery toolchains. If this
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# option is not available, we fallback to the value of --with-sysroot
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# as visible in CROSS-gcc -v. We don't pass any option to gcc that
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# could select a multilib variant as we want the "main" sysroot, which
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# contains all variants of the C library in the case of multilib
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# toolchains.
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TARGET_CC_NO_SYSROOT=$(filter-out --sysroot=%,$(TARGET_CC))
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SYSROOT_DIR=$(shell $(TARGET_CC_NO_SYSROOT) -print-sysroot 2>/dev/null)
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ifeq ($(SYSROOT_DIR),)
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SYSROOT_DIR=$(shell readlink -f $$(LANG=C $(TARGET_CC_NO_SYSROOT) -print-file-name=libc.a) |sed -r -e 's:usr/lib/libc\.a::;')
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endif
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# Now, find if the toolchain specifies a sub-directory for the
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# specific architecture variant we're interested in. This is the case
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# with multilib toolchain, when the selected architecture variant is
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# not the default one. To do so, we ask the compiler by passing all
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# flags, except the --sysroot flag since we want to the compiler to
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# tell us where its original sysroot is. ARCH_SUBDIR will contain the
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# subdirectory, in the main SYSROOT_DIR, that corresponds to the
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# selected architecture variant. ARCH_SYSROOT_DIR will contain the
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# full path to this location.
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ARCH_SUBDIR=$(shell $(TARGET_CC_NO_SYSROOT) $(TARGET_CFLAGS) -print-multi-directory)
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ARCH_SYSROOT_DIR=$(SYSROOT_DIR)/$(ARCH_SUBDIR)
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$(STAMP_DIR)/ext-toolchain-installed:
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@echo "Checking external toolchain settings"
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$(Q)$(call check_cross_compiler_exists)
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ifeq ($(strip $(SYSROOT_DIR)),)
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@echo "External toolchain doesn't support --sysroot. Cannot use."
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exit 1
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endif
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ifeq ($(BR2_arm),y)
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$(Q)$(call check_arm_abi)
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endif
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ifeq ($(BR2_INSTALL_LIBSTDCPP),y)
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$(Q)$(call check_cplusplus)
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endif
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ifeq ($(BR2_TOOLCHAIN_EXTERNAL_UCLIBC),y)
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$(Q)$(call check_uclibc,$(SYSROOT_DIR))
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else
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$(Q)$(call check_glibc,$(SYSROOT_DIR))
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endif
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mkdir -p $(TARGET_DIR)/lib
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@echo "Copy external toolchain libraries to target..."
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$(Q)for libs in $(LIB_EXTERNAL_LIBS); do \
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$(call copy_toolchain_lib_root,$(ARCH_SYSROOT_DIR),$$libs,/lib,$(BR2_TOOLCHAIN_EXTERNAL_STRIP)); \
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done
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$(Q)for libs in $(USR_LIB_EXTERNAL_LIBS); do \
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$(call copy_toolchain_lib_root,$(ARCH_SYSROOT_DIR),$$libs,/usr/lib,$(BR2_TOOLCHAIN_EXTERNAL_STRIP)); \
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done
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@echo "Copy external toolchain sysroot to staging..."
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$(Q)$(call copy_toolchain_sysroot,$(SYSROOT_DIR),$(ARCH_SYSROOT_DIR),$(ARCH_SUBDIR))
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# Create lib64 symbolic links if needed
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$(Q)if [ -L $(ARCH_SYSROOT_DIR)/lib64 ] ; then \
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$(call create_lib64_symlinks) ; \
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fi
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@touch $@
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