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5171b3033a
If existing board's .specs are used for linking of a user's application,
then instead of normally used libs like libc.a & libstdc++.a might be
requested their "nano"-suffixed siblings: libc_nano.a, libstdc++_nano etc.
That way:
----------------------------->8---------------------------
%rename link_gcc_c_sequence myboard_link_gcc_c_sequence
*myboard_libc:
%{!specs=nano.specs:-lc} %{specs=nano.specs:-lc_nano}
*link_gcc_c_sequence:
%(myboard_link_gcc_c_sequence) --start-group %G %(myboard_libc) --end-group
----------------------------->8---------------------------
Our companion newlib-nano libs are all built optimized for size, so we'd like
to use them for linking. But given linker will see "-lc_nano -lstdc++_nano"
on its command line non-suffixed libs will be ignored.
To solve it we create those "_nano"-suffixed libraries as simple symlinks to
existing libs..
Fixes https://github.com/crosstool-ng/crosstool-ng/issues/1458.
Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
222 lines
7.2 KiB
Bash
222 lines
7.2 KiB
Bash
# This file adds functions to build the Newlib library using the 'nano' configuration
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# Copyright © 2021 Keith Packard
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# Licensed under the GPL v2 or later. See COPYING in the root of this package
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#
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# Edited by Keith Packard <keithp@keithp.com>
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#
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do_newlib_nano_get() { :; }
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do_newlib_nano_extract() { :; }
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do_newlib_nano_for_build() { :; }
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do_newlib_nano_for_host() { :; }
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do_newlib_nano_for_target() { :; }
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if [ "${CT_COMP_LIBS_NEWLIB_NANO}" = "y" ]; then
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# Download newlib_nano
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do_newlib_nano_get() {
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CT_Fetch NEWLIB_NANO
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}
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do_newlib_nano_extract() {
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CT_ExtractPatch NEWLIB_NANO
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}
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# Some architectures assume "nano" libs co-exist with normal ones
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# in the same folder, though being suffixed with "_nano".
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do_nano_libc_symlinks() {
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CT_Pushd "${CT_PREFIX_DIR}/newlib-nano/${CT_TARGET}/lib/${multi_dir}"
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CT_DoLog DEBUG "Installing nano libc symlinks in $PWD"
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ln -s libc.a libc_nano.a
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ln -s libm.a libm_nano.a
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ln -s libg.a libg_nano.a
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CT_Popd
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}
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do_nano_libstdcxx_symlinks() {
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CT_Pushd "${CT_PREFIX_DIR}/newlib-nano/${CT_TARGET}/lib/${multi_dir}"
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CT_DoLog DEBUG "Installing nano libstdc++ symlinks in $PWD"
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ln -s libstdc++.a libstdc++_nano.a
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ln -s libsupc++.a libsupc++_nano.a
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CT_Popd
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}
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#------------------------------------------------------------------------------
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# Build an additional target libstdc++ with "-Os" (optimise for speed) option
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# flag for libstdc++ "newlib_nano" variant.
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do_cc_libstdcxx_newlib_nano()
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{
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local -a final_opts
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local final_backend
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if [ "${CT_NEWLIB_NANO_GCC_LIBSTDCXX}" = "y" ]; then
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final_opts+=( "host=${CT_HOST}" )
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final_opts+=( "libstdcxx_name=newlib-nano" )
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final_opts+=( "prefix=${CT_PREFIX_DIR}" )
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final_opts+=( "complibs=${CT_HOST_COMPLIBS_DIR}" )
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final_opts+=( "cflags=${CT_CFLAGS_FOR_HOST}" )
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final_opts+=( "ldflags=${CT_LDFLAGS_FOR_HOST}" )
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final_opts+=( "lang_list=c,c++" )
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final_opts+=( "build_step=libstdcxx" )
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if [ "${CT_LIBC_NEWLIB_NANO_ENABLE_TARGET_OPTSPACE}" = "y" ]; then
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final_opts+=( "enable_optspace=yes" )
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fi
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if [ "${CT_BARE_METAL}" = "y" ]; then
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final_opts+=( "mode=baremetal" )
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final_opts+=( "build_libgcc=yes" )
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final_opts+=( "build_libstdcxx=yes" )
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final_opts+=( "build_libgfortran=yes" )
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if [ "${CT_STATIC_TOOLCHAIN}" = "y" ]; then
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final_opts+=( "build_staticlinked=yes" )
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fi
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final_backend=do_gcc_core_backend
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else
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final_backend=do_gcc_backend
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fi
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CT_DoStep INFO "Installing libstdc++ newlib-nano"
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CT_mkdir_pushd "${CT_BUILD_DIR}/build-cc-libstdcxx-newlib-nano"
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"${final_backend}" "${final_opts[@]}"
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# Create "nano" symlinks for libstdc++.a & libsup++.a
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CT_IterateMultilibs do_nano_libstdcxx_symlinks libstdcxx_symlinks
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CT_Popd
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CT_EndStep
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fi
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}
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do_newlib_nano_for_target() {
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local -a newlib_nano_opts
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local cflags_for_target
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CT_DoStep INFO "Installing Newlib Nano library"
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CT_mkdir_pushd "${CT_BUILD_DIR}/build-newlib_nano-build-${CT_BUILD}"
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CT_DoLog EXTRA "Configuring Newlib Nano library"
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# Multilib is the default, so if it is not enabled, disable it.
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if [ "${CT_MULTILIB}" != "y" ]; then
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newlib_nano_opts+=("-Dmultilib=false")
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fi
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if [ "${CT_LIBC_NEWLIB_NANO_IO_FLOAT}" = "y" ]; then
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newlib_opts+=( "--enable-newlib-io-float" )
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if [ "${CT_LIBC_NEWLIB_NANO_IO_LDBL}" = "y" ]; then
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newlib_opts+=( "--enable-newlib-io-long-double" )
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else
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newlib_opts+=( "--disable-newlib-io-long-double" )
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fi
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else
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newlib_opts+=( "--disable-newlib-io-float" )
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newlib_opts+=( "--disable-newlib-io-long-double" )
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fi
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if [ "${CT_LIBC_NEWLIB_NANO_DISABLE_SUPPLIED_SYSCALLS}" = "y" ]; then
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newlib_opts+=( "--disable-newlib-supplied-syscalls" )
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else
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newlib_opts+=( "--enable-newlib-supplied-syscalls" )
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fi
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yn_args="IO_POS_ARGS:newlib-io-pos-args
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IO_C99FMT:newlib-io-c99-formats
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IO_LL:newlib-io-long-long
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REGISTER_FINI:newlib-register-fini
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NANO_MALLOC:newlib-nano-malloc
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NANO_FORMATTED_IO:newlib-nano-formatted-io
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ATEXIT_DYNAMIC_ALLOC:newlib-atexit-dynamic-alloc
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GLOBAL_ATEXIT:newlib-global-atexit
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LITE_EXIT:lite-exit
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REENT_SMALL:newlib-reent-small
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MULTITHREAD:newlib-multithread
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RETARGETABLE_LOCKING:newlib-retargetable-locking
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WIDE_ORIENT:newlib-wide-orient
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FSEEK_OPTIMIZATION:newlib-fseek-optimization
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FVWRITE_IN_STREAMIO:newlib-fvwrite-in-streamio
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UNBUF_STREAM_OPT:newlib-unbuf-stream-opt
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ENABLE_TARGET_OPTSPACE:target-optspace
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"
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for ynarg in $yn_args; do
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var="CT_LIBC_NEWLIB_NANO_${ynarg%:*}"
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eval var=\$${var}
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argument=${ynarg#*:}
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if [ "${var}" = "y" ]; then
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newlib_opts+=( "--enable-$argument" )
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else
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newlib_opts+=( "--disable-$argument" )
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fi
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done
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[ "${CT_LIBC_NEWLIB_NANO_EXTRA_SECTIONS}" = "y" ] && \
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CT_LIBC_NEWLIB_NANO_TARGET_CFLAGS="${CT_LIBC_NEWLIB_NANO_TARGET_CFLAGS} -ffunction-sections -fdata-sections"
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[ "${CT_LIBC_NEWLIB_NANO_LTO}" = "y" ] && \
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CT_LIBC_NEWLIB_NANO_TARGET_CFLAGS="${CT_LIBC_NEWLIB_NANO_TARGET_CFLAGS} -flto"
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cflags_for_target="${CT_ALL_TARGET_CFLAGS} ${CT_LIBC_NEWLIB_NANO_TARGET_CFLAGS}"
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# Note: newlib handles the build/host/target a little bit differently
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# than one would expect:
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# build : not used
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# host : the machine building newlib
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# target : the machine newlib runs on
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CT_DoExecLog CFG \
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CC_FOR_BUILD="${CT_BUILD}-gcc" \
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CFLAGS_FOR_TARGET="${cflags_for_target}" \
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AR_FOR_TARGET="`which ${CT_TARGET}-gcc-ar`" \
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RANLIB_FOR_TARGET="`which ${CT_TARGET}-gcc-ranlib`" \
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${CONFIG_SHELL} \
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"${CT_SRC_DIR}/newlib-nano/configure" \
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--host=${CT_BUILD} \
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--target=${CT_TARGET} \
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--prefix=${CT_PREFIX_DIR} \
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--exec-prefix=${CT_PREFIX_DIR}/newlib-nano \
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--libdir=${CT_PREFIX_DIR}/newlib-nano/${CT_TARGET}/lib \
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"${newlib_opts[@]}" \
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"${CT_LIBC_NEWLIB_NANO_EXTRA_CONFIG_ARRAY[@]}"
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CT_DoLog EXTRA "Building Newlib Nano C library"
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CT_DoExecLog ALL make ${CT_JOBSFLAGS}
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CT_DoLog EXTRA "Installing Newlib Nano C library"
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CT_DoExecLog ALL make install
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cat > "${CT_SYSROOT_DIR}/lib/nano.specs" <<EOF
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%rename link newlib_nano_link
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%rename cpp newlib_nano_cpp
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%rename cc1plus newlib_nano_cc1plus
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*cpp:
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-isystem ${CT_PREFIX_DIR}/newlib-nano/${CT_TARGET}/include %(newlib_nano_cpp)
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*cc1plus:
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-idirafter ${CT_PREFIX_DIR}/newlib-nano/${CT_TARGET}/include %(newlib_nano_cc1plus)
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*link:
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-L${CT_PREFIX_DIR}/newlib-nano/${CT_TARGET}/lib/%M -L${CT_PREFIX_DIR}/newlib-nano/${CT_TARGET}/lib
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EOF
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# Create "nano" symlinks for libc.a, libg.a & libm.a
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CT_IterateMultilibs do_nano_libc_symlinks libc_symlinks
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CT_Popd
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CT_EndStep
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do_cc_libstdcxx_newlib_nano
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}
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fi
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