b6e67cc363
If threads are disabled, do not try to copy the libpthread.so from the external library. It is still expected that the BR configuration matches the external toolchain setup, and no check is done to enforce that. Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
320 lines
12 KiB
Makefile
320 lines
12 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 toolchains made available by Codesourcery
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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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#
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# Copy a toolchain library and its symbolic links from the sysroot
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# directory to the target directory. Also optionaly strips the
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# library.
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#
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# $1: arch specific sysroot directory
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# $2: library name
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# $3: destination directory
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# $4: strip (y|n), default is to strip
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#
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copy_toolchain_lib_root = \
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ARCH_SYSROOT_DIR="$(strip $1)"; \
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LIB="$(strip $2)"; \
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STRIP="$(strip $4)"; \
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\
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LIBS=`(cd $${ARCH_SYSROOT_DIR}; find . -path "./lib/$${LIB}.*" -o -path "./usr/lib/$${LIB}.*")` ; \
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for FILE in $${LIBS} ; do \
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LIB=`basename $${FILE}`; \
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LIBDIR=`dirname $${FILE}` ; \
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while test \! -z "$${LIB}"; do \
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FULLPATH="$${ARCH_SYSROOT_DIR}/$${LIBDIR}/$${LIB}" ; \
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rm -fr $(TARGET_DIR)/$${LIBDIR}/$${LIB}; \
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mkdir -p $(TARGET_DIR)/$${LIBDIR}; \
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if test -h $${FULLPATH} ; then \
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cp -d $${FULLPATH} $(TARGET_DIR)/$${LIBDIR}/; \
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elif test -f $${FULLPATH}; then \
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$(INSTALL) -D -m0755 $${FULLPATH} $(TARGET_DIR)/$${LIBDIR}/$${LIB}; \
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case "$${STRIP}" in \
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(0 | n | no) \
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;; \
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(*) \
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$(TARGET_CROSS)strip "$(TARGET_DIR)/$${LIBDIR}/$${LIB}"; \
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;; \
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esac; \
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else \
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exit -1; \
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fi; \
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LIB="`readlink $${FULLPATH}`"; \
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done; \
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done; \
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\
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echo -n
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#
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# Copy the full external toolchain sysroot directory to the staging
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# dir. The operation of this function is rendered a little bit
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# complicated by the support for multilib toolchains.
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#
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# We start by copying etc, lib, sbin and usr from the sysroot of the
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# selected architecture variant (as pointed by ARCH_SYSROOT_DIR). This
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# allows to import into the staging directory the C library and
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# companion libraries for the correct architecture variant. We
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# explictly only copy etc, lib, sbin and usr since other directories
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# might exist for other architecture variants (on Codesourcery
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# toolchain, the sysroot for the default architecture variant contains
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# the armv4t and thumb2 subdirectories, which are the sysroot for the
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# corresponding architecture variants), and we don't want to import
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# them.
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#
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# Then, if the selected architecture variant is not the default one
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# (i.e, if SYSROOT_DIR != ARCH_SYSROOT_DIR), then we :
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#
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# * Import the header files from the default architecture
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# variant. Header files are typically shared between the sysroots
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# for the different architecture variants. If we use the
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# non-default one, header files were not copied by the previous
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# step, so we copy them here from the sysroot of the default
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# architecture variant.
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#
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# * Create a symbolic link that matches the name of the subdirectory
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# for the architecture variant in the original sysroot. This is
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# required as the compiler will by default look in
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# sysroot_dir/arch_variant/ for libraries and headers, when the
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# non-default architecture variant is used. Without this, the
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# compiler fails to find libraries and headers.
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#
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# $1: main sysroot directory of the toolchain
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# $2: arch specific sysroot directory of the toolchain
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# $3: arch specific subdirectory in the sysroot
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#
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copy_toolchain_sysroot = \
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SYSROOT_DIR="$(strip $1)"; \
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ARCH_SYSROOT_DIR="$(strip $2)"; \
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ARCH_SUBDIR="$(strip $3)"; \
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for i in etc lib sbin usr ; do \
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cp -a $${ARCH_SYSROOT_DIR}/$$i $(STAGING_DIR)/ ; \
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done ; \
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if [ `readlink -f $${SYSROOT_DIR}` != `readlink -f $${ARCH_SYSROOT_DIR}` ] ; then \
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if [ ! -d $${ARCH_SYSROOT_DIR}/usr/include ] ; then \
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cp -a $${SYSROOT_DIR}/usr/include $(STAGING_DIR)/usr ; \
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fi ; \
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ln -s . $(STAGING_DIR)/$(ARCH_SUBDIR) ; \
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fi ; \
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find $(STAGING_DIR) -type d | xargs chmod 755
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#
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# Check the availability of a particular glibc feature. We assume that
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# all Buildroot toolchain options are supported by glibc, so we just
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# check that they are enabled.
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#
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# $1: Buildroot option name
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# $2: feature description
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#
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check_glibc_feature = \
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if [ x$($(1)) != x"y" ] ; then \
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echo "$(2) available in C library, please enable $(1)" ; \
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exit 1 ; \
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fi
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#
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# Check the correctness of a glibc external toolchain configuration.
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# 1. Check that the C library selected in Buildroot matches the one
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# of the external toolchain
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# 2. Check that all the C library-related features are enabled in the
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# config, since glibc always supports all of them
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#
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# $1: sysroot directory
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#
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check_glibc = \
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SYSROOT_DIR="$(strip $1)"; \
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if ! test -f $${SYSROOT_DIR}/lib/ld-linux.so.* ; then \
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echo "Incorrect selection of the C library"; \
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exit -1; \
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fi; \
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$(call check_glibc_feature,BR2_LARGEFILE,Large file support) ;\
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$(call check_glibc_feature,BR2_INET_IPV6,IPv6 support) ;\
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$(call check_glibc_feature,BR2_INET_RPC,RPC support) ;\
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$(call check_glibc_feature,BR2_ENABLE_LOCALE,Locale support) ;\
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$(call check_glibc_feature,BR2_USE_WCHAR,Wide char support) ;\
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$(call check_glibc_feature,BR2_PROGRAM_INVOCATION,Program invocation support)
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#
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# Check the conformity of Buildroot configuration with regard to the
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# uClibc configuration of the external toolchain, for a particular
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# feature.
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#
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# $1: uClibc macro name
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# $2: Buildroot option name
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# $3: uClibc config file
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# $4: feature description
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#
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check_uclibc_feature = \
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IS_IN_LIBC=`grep -q "\#define $(1) 1" $(3) && echo y` ; \
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if [ x$($(2)) != x"y" -a x$${IS_IN_LIBC} == x"y" ] ; then \
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echo "$(4) available in C library, please enable $(2)" ; \
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exit 1 ; \
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fi ; \
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if [ x$($(2)) == x"y" -a x$${IS_IN_LIBC} != x"y" ] ; then \
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echo "$(4) not available in C library, please disable $(2)" ; \
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exit 1 ; \
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fi
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#
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# Check the correctness of a uclibc external toolchain configuration
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# 1. Check that the C library selected in Buildroot matches the one
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# of the external toolchain
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# 2. Check that the features enabled in the Buildroot configuration
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# match the features available in the uClibc of the external
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# toolchain
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#
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# $1: sysroot directory
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#
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check_uclibc = \
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SYSROOT_DIR="$(strip $1)"; \
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if ! test -f $${SYSROOT_DIR}/lib/ld-uClibc.so.* ; then \
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echo "Incorrect selection of the C library"; \
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exit -1; \
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fi; \
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UCLIBC_CONFIG_FILE=$${SYSROOT_DIR}/usr/include/bits/uClibc_config.h ; \
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$(call check_uclibc_feature,__UCLIBC_HAS_LFS__,BR2_LARGEFILE,$${UCLIBC_CONFIG_FILE},Large file support) ;\
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$(call check_uclibc_feature,__UCLIBC_HAS_IPV6__,BR2_INET_IPV6,$${UCLIBC_CONFIG_FILE},IPv6 support) ;\
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$(call check_uclibc_feature,__UCLIBC_HAS_RPC__,BR2_INET_RPC,$${UCLIBC_CONFIG_FILE},RPC support) ;\
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$(call check_uclibc_feature,__UCLIBC_HAS_LOCALE__,BR2_ENABLE_LOCALE,$${UCLIBC_CONFIG_FILE},Locale support) ;\
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$(call check_uclibc_feature,__UCLIBC_HAS_WCHAR__,BR2_USE_WCHAR,$${UCLIBC_CONFIG_FILE},Wide char support) ;\
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$(call check_uclibc_feature,__UCLIBC_HAS_PROGRAM_INVOCATION_NAME__,BR2_PROGRAM_INVOCATION,$${UCLIBC_CONFIG_FILE},Program invocation support) ;\
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#
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# Check that the Buildroot configuration of the ABI matches the
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# configuration of the external toolchain.
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#
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check_arm_abi = \
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EXT_TOOLCHAIN_TARGET=$(shell LANG=C $(TARGET_CC) -v 2>&1 | grep ^Target | cut -f2 -d ' ') ; \
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if echo $${EXT_TOOLCHAIN_TARGET} | grep -q 'eabi$$' ; then \
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EXT_TOOLCHAIN_ABI="eabi" ; \
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else \
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EXT_TOOLCHAIN_ABI="oabi" ; \
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fi ; \
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if [ x$(BR2_ARM_OABI) == x"y" -a $${EXT_TOOLCHAIN_ABI} == "eabi" ] ; then \
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echo "Incorrect ABI setting" ; \
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exit 1 ; \
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fi ; \
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if [ x$(BR2_ARM_EABI) == x"y" -a $${EXT_TOOLCHAIN_ABI} == "oabi" ] ; then \
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echo "Incorrect ABI setting" ; \
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exit 1 ; \
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fi ; \
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#
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# Check that the external toolchain supports C++
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#
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check_cplusplus = \
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if ! test -x $(TARGET_CXX) ; then \
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echo "BR2_INSTALL_LIBSTDCPP is selected but C++ support not available in external toolchain" ; \
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exit 1 ; \
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fi ; \
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#
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# Check that the cross-compiler given in the configuration exists
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#
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check_cross_compiler_exists = \
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if ! test -x $(TARGET_CC) ; then \
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echo "Cannot find cross-compiler $(TARGET_CC)" ; \
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exit 1 ; \
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fi ; \
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uclibc: dependencies $(STAMP_DIR)/ext-toolchain-installed
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EXTERNAL_LIBS=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_UCLIBC),y)
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EXTERNAL_LIBS+=ld-uClibc.so
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else
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EXTERNAL_LIBS+=ld-linux.so libnss_files.so libnss_dns.so
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endif
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ifeq ($(BR2_INSTALL_LIBSTDCPP),y)
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EXTERNAL_LIBS+=libstdc++.so
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endif
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ifneq ($(BR2_PTHREADS_NONE),y)
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EXTERNAL_LIBS+=libpthread.so
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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 the -march= option to gcc
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# as we want the "main" sysroot, which contains all variants of the C
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# library in the case of multilib toolchains.
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SYSROOT_DIR=$(shell $(TARGET_CC) -print-sysroot 2>/dev/null)
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ifeq ($(SYSROOT_DIR),)
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SYSROOT_DIR=$(shell readlink -f $$(LANG=C $(TARGET_CC) -print-file-name=libc.a |sed -r -e 's:usr/lib/libc\.a::;'))
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endif
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# Now, find if the toolchain specifies a sub-directory for the
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# specific architecture variant we're interested in. This is the case
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# with multilib toolchain, when the selected architecture variant is
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# not the default one. To do so, we ask the compiler by passing the
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# appropriate -march= flags. ARCH_SUBDIR will contain the
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# subdirectory, in the main SYSROOT_DIR, that corresponds to the
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# selected architecture variant. ARCH_SYSROOT_DIR will contain the
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# full path to this location.
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ifneq ($(CC_TARGET_ARCH_),)
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TARGET_CC_ARCH_CFLAGS+=-march=$(CC_TARGET_ARCH_)
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endif
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ARCH_SUBDIR=$(shell $(TARGET_CC) $(TARGET_CC_ARCH_CFLAGS) -print-multi-directory)
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ARCH_SYSROOT_DIR=$(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 $(EXTERNAL_LIBS); do \
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$(call copy_toolchain_lib_root,$(ARCH_SYSROOT_DIR),$$libs,$(BR2_TOOLCHAIN_EXTERNAL_STRIP)); \
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done
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@echo "Copy external toolchain sysroot to staging..."
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$(Q)$(call copy_toolchain_sysroot,$(SYSROOT_DIR),$(ARCH_SYSROOT_DIR),$(ARCH_SUBDIR))
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@touch $@
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