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musl: Add multilib support.
Signed-off-by: Alexey Neyman <stilor@att.net>
This commit is contained in:
Alexey Neyman
parent
49d1d8f513
commit
d2af095eb2
@ -57,5 +57,12 @@ CT_DoArchUClibcHeaderDir() {
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:;
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}
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# Multilib/MUSL: Adjust header installation path for given CFLAGS
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# Usage: CT_DoArchMUSLHeaderDir <path-variable> <cflags>
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CT_DoArchMUSLHeaderDir() {
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# Only needed if a given architecture may select different MUSL architectures.
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:;
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}
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# Override from the actual arch implementation as needed.
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. "${CT_LIB_DIR}/scripts/build/arch/${CT_ARCH}.sh"
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@ -167,3 +167,14 @@ CT_DoArchUClibcHeaderDir() {
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eval "${dir_var}="$( ${CT_TARGET}-gcc -print-multiarch ${cflags} )
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fi
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}
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CT_DoArchMUSLHeaderDir() {
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local dir_var="${1}"
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local cflags="${2}"
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# If it is non-default multilib, add a suffix with architecture (reported by gcc)
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# to the headers installation path.
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if [ -n "${cflags}" ]; then
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eval "${dir_var}="$( ${CT_TARGET}-gcc -print-multiarch ${cflags} )
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fi
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}
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@ -32,44 +32,52 @@ do_libc_post_cc() {
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:
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}
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# This backend builds the C library
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# Usage: do_libc_backend param=value [...]
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# Parameter : Definition : Type : Default
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# libc_mode : 'startfiles' or 'final' : string : (none)
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do_libc_backend() {
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local libc_mode
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local -a extra_cflags
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local -a extra_config
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local src_dir="${CT_SRC_DIR}/${CT_LIBC}-${CT_LIBC_VERSION}"
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local libc_headers libc_startfiles libc_full
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local multi_os_dir multi_root multilib_dir
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local arg
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for arg in "$@"; do
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eval "${arg// /\\ }"
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done
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case "${libc_mode}" in
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startfiles)
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CT_DoStep INFO "Installing C library headers & start files"
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libc_headers=y
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libc_startfiles=y
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libc_full=
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;;
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final)
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CT_DoStep INFO "Installing C library"
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libc_headers=
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libc_startfiles=
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libc_full=y
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;;
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startfiles) CT_DoStep INFO "Installing C library headers & start files";;
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final) CT_DoStep INFO "Installing C library";;
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*) CT_Abort "Unsupported (or unset) libc_mode='${libc_mode}'";;
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esac
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multi_root=$( "${CT_TARGET}-gcc" -print-sysroot )
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multi_os_dir=$( "${CT_TARGET}-gcc" -print-multi-os-directory )
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CT_mkdir_pushd "${CT_BUILD_DIR}/build-libc-${libc_mode}"
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CT_IterateMultilibs do_libc_backend_once multilib libc_mode="${libc_mode}"
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CT_Popd
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CT_EndStep
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}
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# This backend builds the C library
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# Usage: do_libc_backend param=value [...]
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# Parameter : Definition : Type : Default
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# libc_mode : 'startfiles' or 'final' : string : (none)
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do_libc_backend_once() {
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local libc_mode
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local -a extra_cflags
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local -a extra_config
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local src_dir="${CT_SRC_DIR}/${CT_LIBC}-${CT_LIBC_VERSION}"
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local multi_dir multi_os_dir multi_root multi_flags multi_index multi_count
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local multilib_dir
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local hdr_install_subdir
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local arg f l
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for arg in "$@"; do
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eval "${arg// /\\ }"
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done
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CT_DoStep INFO "Building for multilib ${multi_index}/${multi_count}: '${multi_flags}'"
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multilib_dir="/usr/lib/${multi_os_dir}"
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CT_SanitizeVarDir multilib_dir
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CT_DoExecLog ALL mkdir -p "${multi_root}${multilib_dir}"
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extra_cflags=( ${multi_flags} )
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# From buildroot:
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# gcc constant folding bug with weak aliases workaround
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# See http://www.openwall.com/lists/musl/2014/05/15/1
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@ -87,7 +95,12 @@ do_libc_backend() {
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extra_config+=( "--enable-optimize=${CT_LIBC_MUSL_OPTIMIZE}" )
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CT_mkdir_pushd "${CT_BUILD_DIR}/build-libc-${libc_mode}"
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# Same problem as with uClibc: different variants sometimes have
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# incompatible headers.
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CT_DoArchMUSLHeaderDir hdr_install_subdir "${multi_flags}"
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if [ -n "${hdr_install_subdir}" ]; then
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extra_config+=( "--includedir=/usr/include/${hdr_install_subdir}" )
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fi
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# NOTE: musl handles the build/host/target a little bit differently
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# then one would expect:
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@ -95,21 +108,19 @@ do_libc_backend() {
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# host : same as --target
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# target : the machine musl runs on
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CT_DoExecLog CFG \
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CFLAGS="${extra_cflags[@]}" \
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CFLAGS="${extra_cflags[*]}" \
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CROSS_COMPILE="${CT_TARGET}-" \
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${src_dir}/configure \
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--host="${CT_TARGET}" \
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--target="${CT_TARGET}" \
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--host="${multi_target}" \
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--target="${multi_target}" \
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--prefix="/usr" \
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--libdir="${multilib_dir}" \
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--disable-gcc-wrapper \
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"${extra_config[@]}"
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if [ "${libc_headers}" = "y" ]; then
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if [ "${libc_mode}" = "startfiles" ]; then
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CT_DoLog EXTRA "Installing C library headers"
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CT_DoExecLog ALL ${make} DESTDIR="${multi_root}" install-headers
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fi
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if [ "${libc_startfiles}" = "y" ]; then
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CT_DoLog EXTRA "Building C library start files"
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CT_DoExecLog ALL ${make} DESTDIR="${multi_root}" \
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obj/crt/crt1.o obj/crt/crti.o obj/crt/crtn.o
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@ -118,7 +129,7 @@ do_libc_backend() {
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CT_DoExecLog ALL ${CT_TARGET}-gcc -nostdlib \
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-nostartfiles -shared -x c /dev/null -o "${multi_root}${multilib_dir}/libc.so"
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fi
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if [ "${libc_full}" = "y" ]; then
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if [ "${libc_mode}" = "final" ]; then
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CT_DoLog EXTRA "Cleaning up start files"
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CT_DoExecLog ALL rm -f "${multi_root}${multilib_dir}/crt1.o" \
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"${multi_root}${multilib_dir}/crti.o" \
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@ -130,6 +141,18 @@ do_libc_backend() {
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CT_DoLog EXTRA "Installing C library"
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CT_DoExecLog ALL ${make} DESTDIR="${multi_root}" install
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# Convert /lib/ld-* symlinks to relative paths so that they are valid
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# both on the host and on the target.
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for f in ${multi_root}/ld-musl-*; do
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[ -L "${f}" ] || continue
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l=$( readlink ${f} )
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case "${l}" in
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${multilib_dir}/*)
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CT_DoExecLog ALL ln -sf "../${l}" "${f}"
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;;
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esac
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done
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fi
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CT_EndStep
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@ -172,7 +172,7 @@ do_libc_backend_once() {
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# at the final stage (see the note below), we may already have the subdirectory
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# in /usr/include.
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CT_DoArchUClibcHeaderDir hdr_install_subdir "${multi_flags}"
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if [ -n "$hdr_install_subdir" ]; then
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if [ -n "${hdr_install_subdir}" ]; then
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CT_DoExecLog ALL cp -a "${multi_root}/usr/include" "${multi_root}/usr/include.saved"
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fi
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@ -236,7 +236,7 @@ do_libc_backend_once() {
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# Now, if installing headers into a subdirectory, put everything in its place.
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# Remove the header subdirectory if it existed already.
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if [ -n "$hdr_install_subdir" ]; then
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if [ -n "${hdr_install_subdir}" ]; then
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CT_DoExecLog ALL mv "${multi_root}/usr/include" "${multi_root}/usr/include.new"
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CT_DoExecLog ALL mv "${multi_root}/usr/include.saved" "${multi_root}/usr/include"
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CT_DoExecLog ALL rm -rf "${multi_root}/usr/include/${hdr_install_subdir}"
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