reviving libbusybox, adding CONFIG_INDIVIDUAL part 1
This commit is contained in:
Denis Vlasenko
parent
e747f62ed6
commit
3240474c23
12
Makefile
12
Makefile
@ -568,11 +568,13 @@ busybox-all := $(core-y) $(libs-y)
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# Rule to link busybox - also used during CONFIG_KALLSYMS
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# May be overridden by arch/$(ARCH)/Makefile
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quiet_cmd_busybox__ ?= LINK $@
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cmd_busybox__ ?= $(srctree)/scripts/trylink $(CC) $(LDFLAGS) $(EXTRA_LDFLAGS) \
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-o $@ -Wl,-Map -Wl,$@.map \
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-Wl,--warn-common -Wl,--sort-common -Wl,--gc-sections \
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-Wl,--start-group $(busybox-all) -Wl,--end-group \
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$(LDLIBS)
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cmd_busybox__ ?= $(srctree)/scripts/trylink \
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"$@" \
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"$(CC)" \
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"$(LDFLAGS) $(EXTRA_LDFLAGS)" \
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"$(core-y)" \
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"$(libs-y)" \
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"$(LDLIBS)"
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# Generate System.map
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quiet_cmd_sysmap = SYSMAP
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@ -3,24 +3,40 @@
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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: $* $added"
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"$@" $added 2>busybox_ld.err
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printf "%s\n" "Output of:" >$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="$6"
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# Sanitize lib list (dups, extra spaces etc)
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#echo "BBOX_LIB_LIST=$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: $BBOX_LIB_LIST"
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# "lib1 lib2 lib3" -> "-llib1 -llib2 -llib3"
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l_list=`echo "$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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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: $* -Wl,--start-group $l_list -Wl,--end-group"
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cat busybox_ld.err
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echo "Failed: $* $l_list"
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cat $EXE.out
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exit 1
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}
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@ -31,15 +47,22 @@ while test "$BBOX_LIB_LIST"; do
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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/ $one / /g" | xargs`
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# "lib1 lib2 lib3" -> "-llib1 -llib2 -llib3"
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l_list=`echo "$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: '$l_list'"
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if try "$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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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 $one is not needed"
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BBOX_LIB_LIST="$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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echo "Library $one is needed"
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fi
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done
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# All libs were needed, can't remove any
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@ -56,13 +79,55 @@ l_list=`echo "$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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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 busybox_ld.out):
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# Add SORT_BY_ALIGNMENT to linker script (found in ${EXE}_ld.out):
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# .rodata : { *(.rodata SORT_BY_ALIGNMENT(.rodata.*) .gnu.linkonce.r.*) }
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# *(.data SORT_BY_ALIGNMENT(.data.*) .gnu.linkonce.d.*)
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# *(.bss SORT_BY_ALIGNMENT(.bss.*) .gnu.linkonce.b.*)
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# This will eliminate most of the data padding (~3kb).
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try "$l_list -Wl,--verbose -Wl,-T -Wl,busybox_ldscript" "$@" >busybox_ld.out
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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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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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echo "Linking $EXE failed"
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exit 1
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}
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