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69 lines
2.5 KiB
Bash
Executable File
69 lines
2.5 KiB
Bash
Executable File
#!/bin/sh
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debug=false
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try() {
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added="$1"
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shift
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$debug && echo "Trying: $* $added"
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"$@" $added 2>busybox_ld.err
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}
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# Sanitize lib list (dups, extra spaces etc)
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#echo "BBOX_LIB_LIST=$BBOX_LIB_LIST"
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BBOX_LIB_LIST=`echo "$BBOX_LIB_LIST" | xargs -n1 | sort | uniq | xargs`
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# First link with all libs. If it fails, bail out
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echo "Trying libraries: $BBOX_LIB_LIST"
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l_list=`echo "$BBOX_LIB_LIST" | sed -e 's/ / -l/g' -e 's/^/-l/' -e 's/^-l$//'`
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test "x$l_list" != "x" && l_list="-Wl,--start-group $l_list -Wl,--end-group"
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try "$l_list" "$@" \
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|| {
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echo "Failed: $* -Wl,--start-group $l_list -Wl,--end-group"
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cat busybox_ld.err
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exit 1
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}
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# Now try to remove each lib and build without it.
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# Stop when no lib can be removed.
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while test "$BBOX_LIB_LIST"; do
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$debug && echo "Trying libraries: $BBOX_LIB_LIST"
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all_needed=true
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for one in $BBOX_LIB_LIST; do
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without_one=`echo " $BBOX_LIB_LIST " | sed "s/ $one / /g" | xargs`
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l_list=`echo "$without_one" | sed -e 's/ / -l/g' -e 's/^/-l/' -e 's/^-l$//'`
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test "x$l_list" != "x" && l_list="-Wl,--start-group $l_list -Wl,--end-group"
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$debug && echo "Trying -l options: '$l_list'"
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if try "$l_list" "$@"; then
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echo "Library $one is not needed"
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BBOX_LIB_LIST="$without_one"
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all_needed=false
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else
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echo "Library $one is needed"
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fi
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done
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# All libs were needed, can't remove any
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$all_needed && break
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# If there is no space char, the list has just one lib.
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# I'm not sure that in this case lib really is 100% needed.
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# Let's try linking without it anyway... thus commented out.
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#{ echo "$BBOX_LIB_LIST" | grep -q ' '; } || break
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done
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# Make the binary with final, minimal list of libs
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echo "Final link with: $BBOX_LIB_LIST"
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l_list=`echo "$BBOX_LIB_LIST" | sed -e 's/ / -l/g' -e 's/^/-l/' -e 's/^-l$//'`
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test "x$l_list" != "x" && l_list="-Wl,--start-group $l_list -Wl,--end-group -Wl,--verbose"
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# --verbose gives us gobs of info to stdout (e.g. linker script used)
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if ! test -f busybox_ldscript; then
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try "$l_list -Wl,--verbose" "$@" >busybox_ld.out
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else
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echo "Custom linker script 'busybox_ldscript' found, using it"
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# Add SORT_BY_ALIGNMENT to linker script (found in busybox_ld.out):
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# .rodata : { *(.rodata SORT_BY_ALIGNMENT(.rodata.*) .gnu.linkonce.r.*) }
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# *(.data SORT_BY_ALIGNMENT(.data.*) .gnu.linkonce.d.*)
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# *(.bss SORT_BY_ALIGNMENT(.bss.*) .gnu.linkonce.b.*)
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# This will eliminate most of the data padding (~3kb).
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try "$l_list -Wl,--verbose -Wl,-T -Wl,busybox_ldscript" "$@" >busybox_ld.out
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fi
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