source: MondoRescue/branches/2.2.5/mindi-busybox/scripts/trylink @ 1765

Last change on this file since 1765 was 1765, checked in by Bruno Cornec, 12 years ago

Update to busybox 1.7.2

  • Property svn:executable set to *
File size: 2.5 KB
Line 
1#!/bin/sh
2
3debug=false
4
5try() {
6    added="$1"
7    shift
8    $debug && echo "Trying: $* $added"
9    "$@" $added 2>busybox_ld.err
10}
11
12# Sanitize lib list (dups, extra spaces etc)
13#echo "BBOX_LIB_LIST=$BBOX_LIB_LIST"
14BBOX_LIB_LIST=`echo "$BBOX_LIB_LIST" | xargs -n1 | sort | uniq | xargs`
15
16# First link with all libs. If it fails, bail out
17echo "Trying libraries: $BBOX_LIB_LIST"
18l_list=`echo "$BBOX_LIB_LIST" | sed -e 's/ / -l/g' -e 's/^/-l/' -e 's/^-l$//'`
19test "x$l_list" != "x" && l_list="-Wl,--start-group $l_list -Wl,--end-group"
20try "$l_list" "$@" \
21|| {
22    echo "Failed: $* -Wl,--start-group $l_list -Wl,--end-group"
23    cat busybox_ld.err
24    exit 1
25}
26
27# Now try to remove each lib and build without it.
28# Stop when no lib can be removed.
29while test "$BBOX_LIB_LIST"; do
30    $debug && echo "Trying libraries: $BBOX_LIB_LIST"
31    all_needed=true
32    for one in $BBOX_LIB_LIST; do
33    without_one=`echo " $BBOX_LIB_LIST " | sed "s/ $one / /g" | xargs`
34    l_list=`echo "$without_one" | sed -e 's/ / -l/g' -e 's/^/-l/' -e 's/^-l$//'`
35    test "x$l_list" != "x" && l_list="-Wl,--start-group $l_list -Wl,--end-group"
36    $debug && echo "Trying -l options: '$l_list'"
37    if try "$l_list" "$@"; then
38        echo "Library $one is not needed"
39        BBOX_LIB_LIST="$without_one"
40        all_needed=false
41    else
42        echo "Library $one is needed"
43    fi
44    done
45    # All libs were needed, can't remove any
46    $all_needed && break
47    # If there is no space char, the list has just one lib.
48    # I'm not sure that in this case lib really is 100% needed.
49    # Let's try linking without it anyway... thus commented out.
50    #{ echo "$BBOX_LIB_LIST" | grep -q ' '; } || break
51done
52
53# Make the binary with final, minimal list of libs
54echo "Final link with: $BBOX_LIB_LIST"
55l_list=`echo "$BBOX_LIB_LIST" | sed -e 's/ / -l/g' -e 's/^/-l/' -e 's/^-l$//'`
56test "x$l_list" != "x" && l_list="-Wl,--start-group $l_list -Wl,--end-group -Wl,--verbose"
57# --verbose gives us gobs of info to stdout (e.g. linker script used)
58if ! test -f busybox_ldscript; then
59    try "$l_list -Wl,--verbose" "$@" >busybox_ld.out
60else
61    echo "Custom linker script 'busybox_ldscript' found, using it"
62    # Add SORT_BY_ALIGNMENT to linker script (found in busybox_ld.out):
63    #  .rodata         : { *(.rodata SORT_BY_ALIGNMENT(.rodata.*) .gnu.linkonce.r.*) }
64    #  *(.data SORT_BY_ALIGNMENT(.data.*) .gnu.linkonce.d.*)
65    #  *(.bss SORT_BY_ALIGNMENT(.bss.*) .gnu.linkonce.b.*)
66    # This will eliminate most of the data padding (~3kb).
67    try "$l_list -Wl,--verbose -Wl,-T -Wl,busybox_ldscript" "$@" >busybox_ld.out
68fi
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