| #!/bin/sh |
| |
| debug=false |
| |
| try() { |
| printf "%s\n" "Output of:" >$EXE.out |
| printf "%s\n" "$*" >>$EXE.out |
| printf "%s\n" "==========" >>$EXE.out |
| $debug && echo "Trying: $*" |
| "$@" >>$EXE.out 2>&1 |
| exitcode=$? |
| cat $EXE.out |
| return $exitcode |
| } |
| |
| EXE="$1" |
| CC="$2" |
| LDFLAGS="$3" |
| O_FILES="$4" |
| A_FILES="$5" |
| LDLIBS="$6" |
| |
| # Sanitize lib list (dups, extra spaces etc) |
| LDLIBS=`echo "$LDLIBS" | xargs -n1 | sort | uniq | xargs` |
| |
| # First link with all libs. If it fails, bail out |
| echo "Trying libraries: $LDLIBS" |
| # "lib1 lib2 lib3" -> "-llib1 -llib2 -llib3" |
| l_list=`echo "$LDLIBS" | sed -e 's/ / -l/g' -e 's/^/-l/' -e 's/^-l$//'` |
| test "x$l_list" != "x" && l_list="-Wl,--start-group $l_list -Wl,--end-group" |
| try $CC $LDFLAGS \ |
| -o $EXE -Wl,-Map -Wl,$EXE.map \ |
| -Wl,--warn-common -Wl,--sort-common -Wl,--gc-sections \ |
| -Wl,--start-group $O_FILES $A_FILES -Wl,--end-group \ |
| $l_list \ |
| >/dev/null \ |
| || { |
| echo "Failed: $* $l_list" |
| cat $EXE.out |
| exit 1 |
| } |
| |
| # Now try to remove each lib and build without it. |
| # Stop when no lib can be removed. |
| while test "$LDLIBS"; do |
| $debug && echo "Trying libraries: $LDLIBS" |
| all_needed=true |
| for one in $LDLIBS; do |
| without_one=`echo " $LDLIBS " | sed "s/ $one / /g" | xargs` |
| # "lib1 lib2 lib3" -> "-llib1 -llib2 -llib3" |
| l_list=`echo "$without_one" | sed -e 's/ / -l/g' -e 's/^/-l/' -e 's/^-l$//'` |
| test "x$l_list" != "x" && l_list="-Wl,--start-group $l_list -Wl,--end-group" |
| $debug && echo "Trying -l options: '$l_list'" |
| try $CC $LDFLAGS \ |
| -o $EXE -Wl,-Map -Wl,$EXE.map \ |
| -Wl,--warn-common -Wl,--sort-common -Wl,--gc-sections \ |
| -Wl,--start-group $O_FILES $A_FILES -Wl,--end-group \ |
| $l_list \ |
| >/dev/null |
| if test $? = 0; then |
| echo "Library $one is not needed" |
| LDLIBS="$without_one" |
| all_needed=false |
| else |
| echo "Library $one is needed" |
| fi |
| done |
| # All libs were needed, can't remove any |
| $all_needed && break |
| # If there is no space char, the list has just one lib. |
| # I'm not sure that in this case lib really is 100% needed. |
| # Let's try linking without it anyway... thus commented out. |
| #{ echo "$LDLIBS" | grep -q ' '; } || break |
| done |
| |
| # Make the binary with final, minimal list of libs |
| echo "Final link with: $LDLIBS" |
| l_list=`echo "$LDLIBS" | sed -e 's/ / -l/g' -e 's/^/-l/' -e 's/^-l$//'` |
| test "x$l_list" != "x" && l_list="-Wl,--start-group $l_list -Wl,--end-group -Wl,--verbose" |
| # --verbose gives us gobs of info to stdout (e.g. linker script used) |
| if ! test -f busybox_ldscript; then |
| try $CC $LDFLAGS \ |
| -o $EXE -Wl,-Map -Wl,$EXE.map \ |
| -Wl,--warn-common -Wl,--sort-common -Wl,--gc-sections \ |
| -Wl,--start-group $O_FILES $A_FILES -Wl,--end-group \ |
| $l_list -Wl,--verbose \ |
| >/dev/null |
| else |
| echo "Custom linker script 'busybox_ldscript' found, using it" |
| # Add SORT_BY_ALIGNMENT to linker script (found in $EXE.out): |
| # .rodata : { *(.rodata SORT_BY_ALIGNMENT(.rodata.*) .gnu.linkonce.r.*) } |
| # *(.data SORT_BY_ALIGNMENT(.data.*) .gnu.linkonce.d.*) |
| # *(.bss SORT_BY_ALIGNMENT(.bss.*) .gnu.linkonce.b.*) |
| # This will eliminate most of the padding (~3kb). |
| try $CC $LDFLAGS \ |
| -o $EXE -Wl,-Map -Wl,$EXE.map \ |
| -Wl,--warn-common -Wl,--sort-common -Wl,--gc-sections \ |
| -Wl,--start-group $O_FILES $A_FILES -Wl,--end-group \ |
| $l_list -Wl,--verbose \ |
| -Wl,-T -Wl,busybox_ldscript \ |
| >/dev/null |
| fi |
| |
| . .config |
| |
| sharedlib_dir="0_lib" |
| |
| if test "$CONFIG_BUILD_LIBBUSYBOX" = y; then |
| mkdir "$sharedlib_dir" 2>/dev/null |
| test -d "$sharedlib_dir" || { |
| echo "Cannot make directory $sharedlib_dir" |
| exit 1 |
| } |
| ln -s "libbusybox.so.$BB_VER" "$sharedlib_dir"/libbusybox.so 2>/dev/null |
| |
| EXE="$sharedlib_dir/libbusybox.so.${BB_VER}_unstripped" |
| try $CC $LDFLAGS \ |
| -o $EXE -Wl,-Map -Wl,$EXE.map \ |
| -shared -fPIC -Wl,--enable-new-dtags \ |
| -Wl,--start-group -Wl,--whole-archive $A_FILES -Wl,--no-whole-archive -Wl,--end-group \ |
| $l_list -Wl,--verbose \ |
| -Wl,-soname="libbusybox.so.$BB_VER" \ |
| -Wl,-z,combreloc \ |
| >/dev/null \ |
| || { |
| echo "Linking $EXE failed" |
| cat $EXE.out |
| exit 1 |
| } |
| strip -s --remove-section=.note --remove-section=.comment $EXE -o "$sharedlib_dir/libbusybox.so.$BB_VER" |
| chmod a+x "$sharedlib_dir/libbusybox.so.$BB_VER" |
| echo "libbusybox: $sharedlib_dir/libbusybox.so.$BB_VER" |
| fi |
| |
| if test "$CONFIG_FEATURE_SHARED_BUSYBOX" = y; then |
| EXE="$sharedlib_dir/busybox_unstripped" |
| try $CC $LDFLAGS \ |
| -o $EXE -Wl,-Map -Wl,$EXE.map \ |
| -Wl,--warn-common -Wl,--sort-common -Wl,--gc-sections \ |
| -Wl,--start-group $O_FILES -Wl,--end-group \ |
| -Wl,--verbose \ |
| -L"$sharedlib_dir" -lbusybox \ |
| >/dev/null \ |
| || { |
| echo "Linking $EXE failed" |
| cat $EXE.out |
| exit 1 |
| } |
| strip -s --remove-section=.note --remove-section=.comment $EXE -o "$sharedlib_dir/busybox" |
| echo "busybox linked against libbusybox: $sharedlib_dir/busybox" |
| fi |
| |
| if test "$CONFIG_FEATURE_INDIVIDUAL" = y; then |
| gcc -DNAME_MAIN_CNAME -E -include include/autoconf.h include/applets.h \ |
| | grep -v "^#" \ |
| | grep -v "^$" \ |
| > applet.lst |
| while read name main junk; do |
| |
| echo "\ |
| void bbox_prepare_main(char **argv); |
| int $main(int argc, char **argv); |
| |
| const char *applet_name = \"$name\"; |
| |
| int main(int argc, char **argv) |
| { |
| bbox_prepare_main(argv); |
| return $main(argc, argv); |
| } |
| " >"$sharedlib_dir/applet.c" |
| |
| EXE="$sharedlib_dir/$name" |
| try $CC $LDFLAGS "$sharedlib_dir/applet.c" \ |
| -o $EXE \ |
| -Wl,--warn-common -Wl,--sort-common -Wl,--gc-sections \ |
| -L"$sharedlib_dir" -lbusybox \ |
| >/dev/null \ |
| || { |
| echo "Linking $EXE failed" |
| cat -- $EXE.out |
| exit 1 |
| } |
| rm -- "$sharedlib_dir/applet.c" $EXE.out |
| strip -s --remove-section=.note --remove-section=.comment $EXE |
| echo "applet linked against libbusybox: $EXE" |
| |
| done <applet.lst |
| fi |
| |
| # libbusybox.so is needed only for -lbusybox at link time, |
| # it is not needed at runtime. Deleting to reduce confusion. |
| rm "$sharedlib_dir"/libbusybox.so >/dev/null |