8 $debug && echo "Trying: $* $added"
9 "$@" $added 2>busybox_ld.err
12 # Sanitize lib list (dups, extra spaces etc)
13 #echo "BBOX_LIB_LIST=$BBOX_LIB_LIST"
14 BBOX_LIB_LIST=`echo "$BBOX_LIB_LIST" | xargs -n1 | sort | uniq | xargs`
16 # First link with all libs. If it fails, bail out
17 l_list=`echo "$BBOX_LIB_LIST" | sed -e 's/ / -l/g' -e 's/^/-l/'`
18 echo "Trying libraries: $BBOX_LIB_LIST"
19 try "-Wl,--start-group $l_list -Wl,--end-group" "$@" \
21 echo "Failed: $* -Wl,--start-group $l_list -Wl,--end-group"
26 #### Hack disabled: conflicts with ld --verbose flag in last link phase
28 ##### Hack: we are not supposed to know executable name,
29 ##### but this hack cuts down link time
30 ####mv busybox_unstripped busybox_unstripped.tmp
31 ####mv busybox.map busybox.map.tmp
33 # Now try to remove each lib and build without it.
34 # Stop when no lib can be removed.
35 ####ever_discarded=false
36 while test "$BBOX_LIB_LIST"; do
37 $debug && echo "Trying libraries: $BBOX_LIB_LIST"
39 for one in $BBOX_LIB_LIST; do
40 without_one=`echo " $BBOX_LIB_LIST " | sed "s/ $one / /g" | xargs`
41 l_list=`echo "$without_one" | sed -e 's/ / -l/g' -e 's/^/-l/'`
42 # If l_list is just "-l" without a lib, then make sure to test the
43 # correct thing to fail: just using -l will fail, so the last lib
44 # (usually m in my case) will incorrectly be added as needed.
45 if test "x$without_one" != "x"; then
46 l_list="-Wl,--start-group $l_list -Wl,--end-group"
48 # without_one is empty, so l_list has to be empty too
51 $debug && echo "Trying -l options: '$l_list'"
52 if try "$l_list" "$@"; then
53 echo "Library $one is not needed"
54 BBOX_LIB_LIST="$without_one"
56 #### ever_discarded=true
58 echo "Library $one is needed"
61 # All libs were needed, can't remove any
63 # If there is no space char, the list has just one lib.
64 # I'm not sure that in this case lib really is 100% needed.
65 # Let's try linking without it anyway... thus commented out.
66 #{ echo "$BBOX_LIB_LIST" | grep -q ' '; } || break
69 ####mv busybox_unstripped.tmp busybox_unstripped
70 ####mv busybox.map.tmp busybox.map
71 ####$ever_discarded && {
72 # Make the binary with final, minimal list of libs
73 echo "Final link with: $BBOX_LIB_LIST"
74 l_list=`echo "$BBOX_LIB_LIST" | sed -e 's/ / -l/g' -e 's/^/-l/'`
75 # --verbose gives us gobs of info to stdout (e.g. linker script used)
76 if ! test -f busybox_ldscript; then
77 try "-Wl,--start-group $l_list -Wl,--end-group -Wl,--verbose" "$@" >busybox_ld.out ####|| exit 1
79 echo "Custom linker script 'busybox_ldscript' found, using it"
80 # Add SORT_BY_ALIGNMENT to linker script (found in busybox_ld.out):
81 # .rodata : { *(.rodata SORT_BY_ALIGNMENT(.rodata.*) .gnu.linkonce.r.*) }
82 # *(.data SORT_BY_ALIGNMENT(.data.*) .gnu.linkonce.d.*)
83 # *(.bss SORT_BY_ALIGNMENT(.bss.*) .gnu.linkonce.b.*)
84 # This will eliminate most of the data padding (~3kb).
85 try "-Wl,--start-group $l_list -Wl,--end-group -Wl,--verbose -Wl,-T -Wl,busybox_ldscript" "$@" >busybox_ld.out
89 ####exit 0 # Ensure "success" exit code