[1765] | 1 | #!/bin/sh
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| 2 |
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| 3 | debug=false
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| 4 |
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| 5 | try() {
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| 6 | added="$1"
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| 7 | shift
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| 8 | $debug && echo "Trying: $* $added"
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| 9 | "$@" $added 2>busybox_ld.err
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| 10 | }
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| 11 |
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| 12 | # Sanitize lib list (dups, extra spaces etc)
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| 13 | #echo "BBOX_LIB_LIST=$BBOX_LIB_LIST"
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| 14 | BBOX_LIB_LIST=`echo "$BBOX_LIB_LIST" | xargs -n1 | sort | uniq | xargs`
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| 15 |
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| 16 | # First link with all libs. If it fails, bail out
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| 17 | echo "Trying libraries: $BBOX_LIB_LIST"
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| 18 | l_list=`echo "$BBOX_LIB_LIST" | sed -e 's/ / -l/g' -e 's/^/-l/' -e 's/^-l$//'`
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| 19 | test "x$l_list" != "x" && l_list="-Wl,--start-group $l_list -Wl,--end-group"
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| 20 | try "$l_list" "$@" \
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| 21 | || {
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| 22 | echo "Failed: $* -Wl,--start-group $l_list -Wl,--end-group"
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| 23 | cat busybox_ld.err
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| 24 | exit 1
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| 25 | }
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| 26 |
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| 27 | # Now try to remove each lib and build without it.
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| 28 | # Stop when no lib can be removed.
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| 29 | while test "$BBOX_LIB_LIST"; do
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| 30 | $debug && echo "Trying libraries: $BBOX_LIB_LIST"
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| 31 | all_needed=true
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| 32 | for one in $BBOX_LIB_LIST; do
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| 33 | without_one=`echo " $BBOX_LIB_LIST " | sed "s/ $one / /g" | xargs`
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| 34 | l_list=`echo "$without_one" | sed -e 's/ / -l/g' -e 's/^/-l/' -e 's/^-l$//'`
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| 35 | test "x$l_list" != "x" && l_list="-Wl,--start-group $l_list -Wl,--end-group"
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| 36 | $debug && echo "Trying -l options: '$l_list'"
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| 37 | if try "$l_list" "$@"; then
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| 38 | echo "Library $one is not needed"
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| 39 | BBOX_LIB_LIST="$without_one"
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| 40 | all_needed=false
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| 41 | else
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| 42 | echo "Library $one is needed"
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| 43 | fi
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| 44 | done
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| 45 | # All libs were needed, can't remove any
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| 46 | $all_needed && break
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| 47 | # If there is no space char, the list has just one lib.
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| 48 | # I'm not sure that in this case lib really is 100% needed.
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| 49 | # Let's try linking without it anyway... thus commented out.
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| 50 | #{ echo "$BBOX_LIB_LIST" | grep -q ' '; } || break
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| 51 | done
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| 52 |
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| 53 | # Make the binary with final, minimal list of libs
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| 54 | echo "Final link with: $BBOX_LIB_LIST"
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| 55 | l_list=`echo "$BBOX_LIB_LIST" | sed -e 's/ / -l/g' -e 's/^/-l/' -e 's/^-l$//'`
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| 56 | test "x$l_list" != "x" && l_list="-Wl,--start-group $l_list -Wl,--end-group -Wl,--verbose"
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| 57 | # --verbose gives us gobs of info to stdout (e.g. linker script used)
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| 58 | if ! test -f busybox_ldscript; then
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| 59 | try "$l_list -Wl,--verbose" "$@" >busybox_ld.out
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| 60 | else
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| 61 | echo "Custom linker script 'busybox_ldscript' found, using it"
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| 62 | # Add SORT_BY_ALIGNMENT to linker script (found in busybox_ld.out):
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| 63 | # .rodata : { *(.rodata SORT_BY_ALIGNMENT(.rodata.*) .gnu.linkonce.r.*) }
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| 64 | # *(.data SORT_BY_ALIGNMENT(.data.*) .gnu.linkonce.d.*)
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| 65 | # *(.bss SORT_BY_ALIGNMENT(.bss.*) .gnu.linkonce.b.*)
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| 66 | # This will eliminate most of the data padding (~3kb).
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| 67 | try "$l_list -Wl,--verbose -Wl,-T -Wl,busybox_ldscript" "$@" >busybox_ld.out
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| 68 | fi
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