136 lines
4.2 KiB
Bash
Executable File
136 lines
4.2 KiB
Bash
Executable File
#!/bin/sh
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debug=false
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try() {
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printf "%s\n" "Output of:" >$EXE.out
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printf "%s\n" "$*" >>$EXE.out
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printf "%s\n" "==========" >>$EXE.out
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$debug && echo "Trying: $*"
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"$@" >>$EXE.out 2>&1
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exitcode=$?
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cat $EXE.out
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return $exitcode
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}
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EXE="$1"
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CC="$2"
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LDFLAGS="$3"
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O_FILES="$4"
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A_FILES="$5"
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LDLIBS="$6"
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# Sanitize lib list (dups, extra spaces etc)
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LDLIBS=`echo "$LDLIBS" | 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: $LDLIBS"
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# "lib1 lib2 lib3" -> "-llib1 -llib2 -llib3"
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l_list=`echo "$LDLIBS" | 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 $CC $LDFLAGS \
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-o $EXE -Wl,-Map -Wl,$EXE.map \
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-Wl,--warn-common -Wl,--sort-common -Wl,--gc-sections \
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-Wl,--start-group $O_FILES $A_FILES -Wl,--end-group \
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$l_list \
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>/dev/null \
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|| {
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echo "Failed: $* $l_list"
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cat $EXE.out
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exit 1
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}
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# Now try to remove each lib and build without it.
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# Stop when no lib can be removed.
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while test "$LDLIBS"; do
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$debug && echo "Trying libraries: $LDLIBS"
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all_needed=true
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for one in $LDLIBS; do
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without_one=`echo " $LDLIBS " | sed "s/ $one / /g" | xargs`
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# "lib1 lib2 lib3" -> "-llib1 -llib2 -llib3"
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l_list=`echo "$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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try $CC $LDFLAGS \
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-o $EXE -Wl,-Map -Wl,$EXE.map \
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-Wl,--warn-common -Wl,--sort-common -Wl,--gc-sections \
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-Wl,--start-group $O_FILES $A_FILES -Wl,--end-group \
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$l_list \
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>/dev/null
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if test $? = 0; then
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echo "Library $one is not needed"
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LDLIBS="$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 "$LDLIBS" | 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: $LDLIBS"
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l_list=`echo "$LDLIBS" | 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 $CC $LDFLAGS \
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-o $EXE -Wl,-Map -Wl,$EXE.map \
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-Wl,--warn-common -Wl,--sort-common -Wl,--gc-sections \
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-Wl,--start-group $O_FILES $A_FILES -Wl,--end-group \
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$l_list -Wl,--verbose \
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>/dev/null
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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 $EXE.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 padding (~3kb).
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try $CC $LDFLAGS \
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-o $EXE -Wl,-Map -Wl,$EXE.map \
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-Wl,--warn-common -Wl,--sort-common -Wl,--gc-sections \
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-Wl,--start-group $O_FILES $A_FILES -Wl,--end-group \
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$l_list -Wl,--verbose \
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-Wl,-T -Wl,busybox_ldscript \
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>/dev/null
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fi
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mkdir 0lib 2>/dev/null
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test -d 0lib || exit 1
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ln -s libbusybox.so.1.8.0 0lib/libbusybox.so 2>/dev/null
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EXE="0lib/libbusybox.so.1.8.0"
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try $CC $LDFLAGS \
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-o $EXE -Wl,-Map -Wl,$EXE.map \
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-shared -fPIC -Wl,--enable-new-dtags \
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-Wl,--start-group -Wl,--whole-archive $A_FILES -Wl,--no-whole-archive -Wl,--end-group \
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$l_list -Wl,--verbose \
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-Wl,-soname="libbusybox.so.1.8.0" \
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-Wl,-z,combreloc \
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>/dev/null \
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|| {
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echo "Linking $EXE failed"
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exit 1
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}
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strip -s --remove-section=.note --remove-section=.comment $EXE
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EXE="0lib/busybox"
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try $CC $LDFLAGS \
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-o $EXE -Wl,-Map -Wl,$EXE.map \
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-Wl,--warn-common -Wl,--sort-common -Wl,--gc-sections \
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-Wl,--start-group $O_FILES -Wl,--end-group \
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$l_list -Wl,--verbose \
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-L"0lib" -lbusybox \
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>/dev/null \
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|| {
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echo "Linking $EXE failed"
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exit 1
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}
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strip -s --remove-section=.note --remove-section=.comment $EXE
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