367a55c7d
Denys Vlasenko
2017-07-15
Subject
build system: FEATURE_LIBBUSYBOX_STATIC - try to pull libc/libm into libbusybox
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Commit Diff GitHub →
Config.in+20 -23
| @@ -386,29 +386,26 @@ config BUILD_LIBBUSYBOX | |
| Build a shared library libbusybox.so.N.N.N which contains all | |
| busybox code. | |
| - | This feature allows every applet to be built as a tiny |
| - | separate executable. Enabling it for "one big busybox binary" |
| - | approach serves no purpose and increases code size. |
| - | You should almost certainly say "no" to this. |
| - | |
| - | ### config FEATURE_FULL_LIBBUSYBOX |
| - | ### bool "Feature-complete libbusybox" |
| - | ### default n if !FEATURE_SHARED_BUSYBOX |
| - | ### depends on BUILD_LIBBUSYBOX |
| - | ### help |
| - | ### Build a libbusybox with the complete feature-set, disregarding |
| - | ### the actually selected config. |
| - | ### |
| - | ### Normally, libbusybox will only contain the features which are |
| - | ### used by busybox itself. If you plan to write a separate |
| - | ### standalone application which uses libbusybox say 'Y'. |
| - | ### |
| - | ### Note: libbusybox is GPL, not LGPL, and exports no stable API that |
| - | ### might act as a copyright barrier. We can and will modify the |
| - | ### exported function set between releases (even minor version number |
| - | ### changes), and happily break out-of-tree features. |
| - | ### |
| - | ### Say 'N' if in doubt. |
| + | This feature allows every applet to be built as a really tiny |
| + | separate executable linked against the library: |
| + | |
| + | $ size 0_lib/l* |
| + | text data bss dec hex filename |
| + | 939 212 28 1179 49b 0_lib/last |
| + | 939 212 28 1179 49b 0_lib/less |
| + | 919138 8328 1556 929022 e2cfe 0_lib/libbusybox.so.1.N.M |
| + | |
| + | This is useful on NOMMU systems which are not capable |
| + | of sharing executables, but are capable of sharing code |
| + | in dynamic libraries. |
| + | |
| + | config FEATURE_LIBBUSYBOX_STATIC |
| + | bool "Pull in all external references into libbusybox" |
| + | default n |
| + | depends on BUILD_LIBBUSYBOX |
| + | help |
| + | Make libbusybox library independent, not using or requiring |
| + | any other shared libraries. |
| config FEATURE_INDIVIDUAL | |
| bool "Produce a binary for each applet, linked against libbusybox" | |
scripts/trylink+12 -6
| @@ -91,7 +91,9 @@ fi | |
| START_GROUP="-Wl,--start-group" | |
| END_GROUP="-Wl,--end-group" | |
| - | INFO_OPTS="-Wl,--warn-common -Wl,-Map,$EXE.map -Wl,--verbose" |
| + | INFO_OPTS() { |
| + | echo "-Wl,--warn-common -Wl,-Map,$EXE.map -Wl,--verbose" |
| + | } |
| # gold may not support --sort-common (yet) | |
| SORT_COMMON="-Wl,--sort-common" | |
| @@ -194,7 +196,7 @@ if ! test -f busybox_ldscript; then | |
| $GC_SECTIONS \ | |
| $START_GROUP $O_FILES $A_FILES $END_GROUP \ | |
| $l_list \ | |
| - | $INFO_OPTS \ |
| + | `INFO_OPTS` \ |
| || { | |
| cat $EXE.out | |
| exit 1 | |
| @@ -225,7 +227,7 @@ else | |
| -Wl,-T,busybox_ldscript \ | |
| $START_GROUP $O_FILES $A_FILES $END_GROUP \ | |
| $l_list \ | |
| - | $INFO_OPTS \ |
| + | `INFO_OPTS` \ |
| || { | |
| cat $EXE.out | |
| exit 1 | |
| @@ -244,10 +246,14 @@ if test "$CONFIG_BUILD_LIBBUSYBOX" = y; then | |
| } | |
| ln -s "libbusybox.so.$BB_VER" "$sharedlib_dir"/libbusybox.so 2>/dev/null | |
| + | # Yes, "ld -shared -static" is a thing. It's a shared library which is itself static. |
| + | LBB_STATIC="" |
| + | test "$CONFIG_FEATURE_LIBBUSYBOX_STATIC" = y && LBB_STATIC="-Wl,-static" |
| + | |
| EXE="$sharedlib_dir/libbusybox.so.${BB_VER}_unstripped" | |
| try $CC $CFLAGS $LDFLAGS \ | |
| -o $EXE \ | |
| - | -shared -fPIC \ |
| + | -shared -fPIC $LBB_STATIC \ |
| -Wl,--enable-new-dtags \ | |
| -Wl,-z,combreloc \ | |
| -Wl,-soname="libbusybox.so.$BB_VER" \ | |
| @@ -256,7 +262,7 @@ if test "$CONFIG_BUILD_LIBBUSYBOX" = y; then | |
| $SORT_SECTION \ | |
| $START_GROUP $A_FILES $END_GROUP \ | |
| $l_list \ | |
| - | $INFO_OPTS \ |
| + | `INFO_OPTS` \ |
| || { | |
| echo "Linking $EXE failed" | |
| cat $EXE.out | |
| @@ -277,7 +283,7 @@ if test "$CONFIG_FEATURE_SHARED_BUSYBOX" = y; then | |
| $START_GROUP $O_FILES $END_GROUP \ | |
| -L"$sharedlib_dir" -lbusybox \ | |
| $l_list \ | |
| - | $INFO_OPTS \ |
| + | `INFO_OPTS` \ |
| || { | |
| echo "Linking $EXE failed" | |
| cat $EXE.out | |