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# This file adds functions to build the Picolibc library
# Copyright © 2020 Keith Packard
# Licensed under the GPL v2 or later. See COPYING in the root of this package
#
# Edited by Keith Packard <keithp@keithp.com>
#
do_picolibc_get() { :; }
do_picolibc_extract() { :; }
do_picolibc_for_build() { :; }
do_picolibc_for_host() { :; }
do_picolibc_for_target() { :; }
if [ "${CT_COMP_LIBS_PICOLIBC}" = "y" ]; then
# Download picolibc
do_picolibc_get() {
CT_Fetch PICOLIBC
}
do_picolibc_extract() {
CT_ExtractPatch PICOLIBC
}
#------------------------------------------------------------------------------
# Build an additional target libstdc++ with "-Os" (optimise for speed) option
# flag for libstdc++ "picolibc" variant.
do_cc_libstdcxx_picolibc()
{
local -a final_opts
local final_backend
if [ "${CT_LIBC_PICOLIBC_GCC_LIBSTDCXX}" = "y" ]; then
final_opts+=( "host=${CT_HOST}" )
final_opts+=( "libstdcxx_name=picolibc" )
final_opts+=( "prefix=${CT_PREFIX_DIR}" )
final_opts+=( "complibs=${CT_HOST_COMPLIBS_DIR}" )
final_opts+=( "cflags=${CT_CFLAGS_FOR_HOST}" )
final_opts+=( "ldflags=${CT_LDFLAGS_FOR_HOST}" )
final_opts+=( "lang_list=c,c++" )
final_opts+=( "build_step=libstdcxx" )
final_opts+=( "extra_config+=('--enable-stdio=stdio_pure')" )
if [ "${CT_LIBC_PICOLIBC_ENABLE_TARGET_OPTSPACE}" = "y" ]; then
final_opts+=( "enable_optspace=yes" )
fi
if [ "${CT_BARE_METAL}" = "y" ]; then
final_opts+=( "mode=baremetal" )
final_opts+=( "build_libgcc=yes" )
final_opts+=( "build_libstdcxx=yes" )
final_opts+=( "build_libgfortran=yes" )
if [ "${CT_STATIC_TOOLCHAIN}" = "y" ]; then
final_opts+=( "build_staticlinked=yes" )
fi
final_backend=do_gcc_core_backend
else
final_backend=do_gcc_backend
fi
CT_DoStep INFO "Installing libstdc++ picolibc"
CT_mkdir_pushd "${CT_BUILD_DIR}/build-cc-libstdcxx-picolibc"
"${final_backend}" "${final_opts[@]}"
CT_Popd
CT_EndStep
fi
}
do_picolibc_for_target() {
local -a picolibc_opts
local cflags_for_target
CT_DoStep INFO "Installing Picolibc library"
CT_mkdir_pushd "${CT_BUILD_DIR}/build-picolibc-build-${CT_BUILD}"
CT_DoLog EXTRA "Configuring Picolibc library"
# Multilib is the default, so if it is not enabled, disable it.
if [ "${CT_MULTILIB}" != "y" ]; then
picolibc_opts+=("-Dmultilib=false")
fi
yn_args="IO_C99FMT:io-c99-formats
IO_LL:io-long-long
REGISTER_FINI:newlib-register-fini
NANO_MALLOC:newlib-nano-malloc
ATEXIT_DYNAMIC_ALLOC:newlib-atexit-dynamic-alloc
GLOBAL_ATEXIT:newlib-global-atexit
LITE_EXIT:lite-exit
MULTITHREAD:newlib-multithread
RETARGETABLE_LOCKING:newlib-retargetable-locking
"
for ynarg in $yn_args; do
var="CT_LIBC_PICOLIBC_${ynarg%:*}"
eval var=\$${var}
argument=${ynarg#*:}
if [ "${var}" = "y" ]; then
picolibc_opts+=( "-D$argument=true" )
else
picolibc_opts+=( "-D$argument=false" )
fi
done
[ "${CT_USE_SYSROOT}" = "y" ] && \
picolibc_opts+=( "-Dsysroot-install=true" )
[ "${CT_LIBC_PICOLIBC_EXTRA_SECTIONS}" = "y" ] && \
CT_LIBC_PICOLIBC_TARGET_CFLAGS="${CT_LIBC_PICOLIBC_TARGET_CFLAGS} -ffunction-sections -fdata-sections"
[ "${CT_LIBC_PICOLIBC_LTO}" = "y" ] && \
CT_LIBC_PICOLIBC_TARGET_CFLAGS="${CT_LIBC_PICOLIBC_TARGET_CFLAGS} -flto"
cflags_for_target="${CT_ALL_TARGET_CFLAGS} ${CT_LIBC_PICOLIBC_TARGET_CFLAGS}"
# Note: picolibc handles the build/host/target a little bit differently
# than one would expect:
# build : not used
# host : the machine building picolibc
# target : the machine picolibc runs on
meson_cflags=""
for cflag in ${cflags_for_target}; do
meson_cflags="${meson_cflags} '${cflag}',"
done
cat << EOF > picolibc-cross.txt
[binaries]
c = '${CT_TARGET}-gcc'
ar = '${CT_TARGET}-ar'
as = '${CT_TARGET}-as'
strip = '${CT_TARGET}-strip'
[host_machine]
system = '${CT_TARGET_VENDOR}'
cpu_family = '${CT_TARGET_ARCH}'
cpu = '${CT_TARGET_ARCH}'
endian = '${CT_ARCH_ENDIAN}'
[properties]
c_args = [ ${meson_cflags} '-nostdlib', '-fno-common', '-ftls-model=local-exec' ]
needs_exe_wrapper = true
skip_sanity_check = true
EOF
CT_DoExecLog CFG \
meson \
--cross-file picolibc-cross.txt \
--prefix="${CT_PREFIX_DIR}" \
-Dincludedir=picolibc/include \
-Dlibdir=picolibc/${CT_TARGET}/lib \
-Dspecsdir="${CT_SYSROOT_DIR}"/lib \
"${CT_SRC_DIR}/picolibc" \
"${picolibc_opts[@]}" \
"${CT_LIBC_PICOLIBC_EXTRA_CONFIG_ARRAY[@]}"
CT_DoLog EXTRA "Building C library"
CT_DoExecLog ALL ninja
CT_DoLog EXTRA "Installing C library"
CT_DoExecLog ALL ninja install
CT_Popd
CT_EndStep
do_cc_libstdcxx_picolibc
}
fi
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