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# This file adds functions to build the musl C library
# Copyright 2013 Timo Teräs
# Licensed under the GPL v2. See COPYING in the root of this package
do_libc_get() {
if [ "${CT_LIBC_MUSL_CUSTOM}" = "y" ]; then
CT_GetCustom "musl" "${CT_LIBC_MUSL_CUSTOM_VERSION}" \
"${CT_LIBC_MUSL_CUSTOM_LOCATION}"
else # ! custom location
CT_GetFile "musl-${CT_LIBC_VERSION}" http://www.musl-libc.org/releases
fi # ! custom location
}
do_libc_extract() {
CT_Extract "musl-${CT_LIBC_VERSION}"
CT_Patch "musl" "${CT_LIBC_VERSION}"
}
do_libc_check_config() {
:
}
# Build and install headers and start files
do_libc_start_files() {
# Start files and Headers should be configured the same way as the
# final libc, but built and installed differently.
do_libc_backend libc_mode=startfiles
}
# This function builds and install the full C library
do_libc() {
do_libc_backend libc_mode=final
}
do_libc_post_cc() {
:
}
# This backend builds the C library
# Usage: do_libc_backend param=value [...]
# Parameter : Definition : Type : Default
# libc_mode : 'startfiles' or 'final' : string : (none)
do_libc_backend() {
local libc_mode
local -a extra_cflags
local -a extra_config
local src_dir="${CT_SRC_DIR}/${CT_LIBC}-${CT_LIBC_VERSION}"
local libc_headers libc_startfiles libc_full
for arg in "$@"; do
eval "${arg// /\\ }"
done
case "${libc_mode}" in
startfiles)
CT_DoStep INFO "Installing C library headers & start files"
libc_headers=y
libc_startfiles=y
libc_full=
;;
final)
CT_DoStep INFO "Installing C library"
libc_headers=
libc_startfiles=
libc_full=y
;;
*) CT_Abort "Unsupported (or unset) libc_mode='${libc_mode}'";;
esac
# From buildroot:
# gcc constant folding bug with weak aliases workaround
# See http://www.openwall.com/lists/musl/2014/05/15/1
if [ "${CT_CC_GCC_4_9_or_later}" = "y" ]; then
extra_cflags+=("-fno-toplevel-reorder")
fi
if [ "${CT_LIBC_MUSL_DEBUG}" = "y" ]; then
extra_config+=("--enable-debug")
fi
if [ "${CT_LIBC_MUSL_WARNINGS}" = "y" ]; then
extra_config+=("--enable-warnings")
fi
extra_config+=( "--enable-optimize=${CT_LIBC_MUSL_OPTIMIZE}" )
CT_mkdir_pushd "${CT_BUILD_DIR}/build-libc-${libc_mode}"
# NOTE: musl handles the build/host/target a little bit differently
# then one would expect:
# build : not used
# host : the machine building musl
# target : the machine musl runs on
CT_DoExecLog CFG \
CFLAGS="${extra_cflags[@]}" \
CROSS_COMPILE="${CT_TARGET}-" \
${src_dir}/configure \
--host="${CT_TARGET}" \
--target="${CT_TARGET}" \
--prefix="/usr" \
--disable-gcc-wrapper \
"${extra_config[@]}"
if [ "${libc_headers}" = "y" ]; then
CT_DoLog EXTRA "Installing C library headers"
CT_DoExecLog ALL ${make} DESTDIR="${CT_SYSROOT_DIR}" install-headers
fi
if [ "${libc_startfiles}" = "y" ]; then
CT_DoLog EXTRA "Building C library start files"
CT_DoExecLog ALL ${make} DESTDIR="${CT_SYSROOT_DIR}" \
obj/crt/crt1.o obj/crt/crti.o obj/crt/crtn.o
CT_DoLog EXTRA "Installing C library start files"
CT_DoExecLog ALL cp -av obj/crt/crt*.o "${CT_SYSROOT_DIR}/usr/lib"
CT_DoExecLog ALL ${CT_TARGET}-gcc -nostdlib \
-nostartfiles -shared -x c /dev/null -o "${CT_SYSROOT_DIR}/usr/lib/libc.so"
fi
if [ "${libc_full}" = "y" ]; then
CT_DoLog EXTRA "Building C library"
CT_DoExecLog ALL ${make} ${JOBSFLAGS}
CT_DoLog EXTRA "Installing C library"
CT_DoExecLog ALL ${make} DESTDIR="${CT_SYSROOT_DIR}" install
fi
CT_EndStep
}
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