50ac5f9a57
When an external toolchain has multiple variants organized in
sub-directories, Buildroot only copies the selected sysroot and not
all sysroots. In order to make this work, Buildroot creates a symbolic
link of the name of the original selected sysroot to the main sysroot
to trick the compiler so that it finds its libraries at the expected
location.
I.e, if the toolchain as the following organization (example take on
the ARM CodeSourcery toolchain) :
. for ARMv5T
armv4 for ARMv4T
thumb2 for ARMv7-A/Thumb
and ARMv4T is selected, then Buildroot will copy the contents of
armv4t/ from the toolchain into its $(STAGING_DIR) and then create a
$(STAGING_DIR)/armv4t symbolic link to $(STAGING_DIR).
However, our logic to do so only works when there was one directory
level for multilib sysroots. But in the MIPS CodeSourcery toolchain
there are multiple levels. For example, the MIPS16 soft-float
little-endian sysroot variant is in mips16/soft-float/el/ compared to
the main sysroot.
This patch improves our logic to support this case. The logic is a bit
more complicated as we don't want to create a symbolic link to an
absolute path, but a symbolic link to a relative path, because we want
the host/ directory to be relocatable.
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
261 lines
9.7 KiB
Makefile
261 lines
9.7 KiB
Makefile
# This Makefile fragment declares helper functions, usefull to handle
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# non- buildroot-built toolchains, eg. purely external toolchains or
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# toolchains (internally) built using crosstool-NG.
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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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# Most toolchains have their libraries either in /lib or /usr/lib
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# relative to their ARCH_SYSROOT_DIR. Buildroot toolchains, however,
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# have basic libraries in /lib, and libstdc++/libgcc_s in
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# /usr/<target-name>/lib(64). Thanks to ARCH_LIB_DIR we also take into
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# account toolchains that have the libraries in lib64 and usr/lib64.
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#
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# $1: arch specific sysroot directory
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# $2: library directory ('lib' or 'lib64') from which libraries must be copied
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# $3: library name
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# $4: destination directory of the libary, relative to $(TARGET_DIR)
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#
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copy_toolchain_lib_root = \
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ARCH_SYSROOT_DIR="$(strip $1)"; \
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ARCH_LIB_DIR="$(strip $2)" ; \
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LIB="$(strip $3)"; \
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DESTDIR="$(strip $4)" ; \
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\
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LIBS=`(cd $${ARCH_SYSROOT_DIR}; \
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find -L $${ARCH_LIB_DIR} usr/$${ARCH_LIB_DIR} usr/$(TOOLCHAIN_EXTERNAL_PREFIX)/$${ARCH_LIB_DIR} \
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-maxdepth 1 -name "$${LIB}.*" 2>/dev/null \
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)` ; \
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for FILE in $${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)/$${DESTDIR}/$${LIB}; \
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mkdir -p $(TARGET_DIR)/$${DESTDIR}; \
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if test -h $${FULLPATH} ; then \
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cp -d $${FULLPATH} $(TARGET_DIR)/$${DESTDIR}/; \
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elif test -f $${FULLPATH}; then \
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$(INSTALL) -D -m0755 $${FULLPATH} $(TARGET_DIR)/$${DESTDIR}/$${LIB}; \
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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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# Note that the 'locale' directories are not copied. They are huge
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# (400+MB) in CodeSourcery toolchains, and they are not really useful.
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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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# $4: directory of libraries ('lib' or 'lib64')
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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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ARCH_LIB_DIR="$(strip $4)" ; \
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for i in etc $${ARCH_LIB_DIR} sbin usr ; do \
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if [ -d $${ARCH_SYSROOT_DIR}/$$i ] ; then \
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rsync -au --chmod=Du+w --exclude 'usr/lib/locale' $${ARCH_SYSROOT_DIR}/$$i $(STAGING_DIR)/ ; \
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fi ; \
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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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mkdir -p `dirname $(STAGING_DIR)/$${ARCH_SUBDIR}` ; \
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relpath="./" ; \
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nbslashs=`echo -n $${ARCH_SUBDIR} | sed 's%[^/]%%g' | wc -c` ; \
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for slash in `seq 1 $${nbslashs}` ; do \
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relpath=$${relpath}"../" ; \
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done ; \
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ln -s $${relpath} $(STAGING_DIR)/$${ARCH_SUBDIR} ; \
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echo "Symlinking $(STAGING_DIR)/$${ARCH_SUBDIR} -> $${relpath}" ; \
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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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# Create lib64 -> lib and usr/lib64 -> usr/lib symbolic links in the
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# target and staging directories. This is needed for some 64 bits
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# toolchains such as the Crosstool-NG toolchains, for which the path
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# to the dynamic loader and other libraries is /lib64, but the
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# libraries are stored in /lib.
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#
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create_lib64_symlinks = \
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(cd $(TARGET_DIR) ; ln -s lib lib64) ; \
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(cd $(TARGET_DIR)/usr ; ln -s lib lib64) ; \
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(cd $(STAGING_DIR) ; ln -s lib lib64) ; \
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(cd $(STAGING_DIR)/usr ; ln -s lib lib64)
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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 $${SYSROOT_DIR}/lib/ld-linux*.so.* -o -f $${SYSROOT_DIR}/lib/ld.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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$(call check_glibc_feature,BR2_USE_MMU,MMU support) ;\
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$(call check_glibc_feature,BR2_USE_WCHAR,Wide char 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,__ARCH_USE_MMU__,BR2_USE_MMU,$${UCLIBC_CONFIG_FILE},MMU support) ;\
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$(call check_uclibc_feature,__UCLIBC_HAS_LFS__,BR2_LARGEFILE,$${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_THREADS__,BR2_TOOLCHAIN_HAS_THREADS,$${UCLIBC_CONFIG_FILE},Thread support) ;\
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$(call check_uclibc_feature,__PTHREADS_DEBUG_SUPPORT__,BR2_TOOLCHAIN_HAS_THREADS_DEBUG,$${UCLIBC_CONFIG_FILE},Thread debugging 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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# $1: cross-gcc path
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#
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check_arm_abi = \
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__CROSS_CC=$(strip $1) ; \
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EXT_TOOLCHAIN_TARGET=`LANG=C $${__CROSS_CC} -v 2>&1 | grep ^Target | cut -f2 -d ' '` ; \
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if echo $${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 $${EXT_TOOLCHAIN_ABI} = "oabi" ] ; then \
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echo "Incorrect ABI setting" ; \
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exit 1 ; \
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fi
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#
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# Check that the external toolchain supports C++
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#
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# $1: cross-g++ path
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#
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check_cplusplus = \
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__CROSS_CXX=$(strip $1) ; \
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$${__CROSS_CXX} -v > /dev/null 2>&1 ; \
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if test $$? -ne 0 ; then \
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echo "C++ support is selected but is not available in external toolchain" ; \
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exit 1 ; \
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fi
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#
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# Check that the cross-compiler given in the configuration exists
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#
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# $1: cross-gcc path
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#
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check_cross_compiler_exists = \
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__CROSS_CC=$(strip $1) ; \
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$${__CROSS_CC} -v > /dev/null 2>&1 ; \
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if test $$? -ne 0 ; then \
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echo "Cannot execute cross-compiler '$${__CROSS_CC}'" ; \
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exit 1 ; \
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fi
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