| |
| # |
| # 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 $@ |