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https://github.com/topjohnwu/ndk-busybox.git
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trylink: reformat link flags for readability
trylink: add --sort-section alignment:
text data bss dec hex filename
- 6557 428 3260 10245 2805 busybox
+ 6555 428 3260 10243 2803 busybox
- 909621 1076 12108 922805 e14b5 libbusybox.so.1.8.0.svn
+ 908868 1050 12016 921934 e114e libbusybox.so.1.8.0.svn
This commit is contained in:
Denis Vlasenko
parent
d19b87ece4
commit
01f3b2c91a
104
scripts/trylink
104
scripts/trylink
@ -2,6 +2,42 @@
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debug=false
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# Linker flags used:
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#
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# Informational:
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# --warn-common
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# -Map $EXE.map
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# --verbose
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#
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# Optimizations:
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# --sort-common reduces padding
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# --sort-section alignment reduces padding
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# --gc-sections throws out unused sections,
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# does not work for shared libs
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# -O Not used, maybe useful?
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#
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# List of files to link:
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# $l_list == --start-group -llib1 -llib2 --end-group
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# --start-group $O_FILES $A_FILES --end-group
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# or for shlib:
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# --start-group --whole-archive $A_FILES --no-whole-archive --end-group
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# otherwise we don't pull in all parts of *.a files. Now we pull in too much.
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# FIXME: make it work without --whole-archive, or better, with --gc-sections.
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#
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# Shared library link:
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# -shared self-explanatory
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# -fPIC position-independent code
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# -Wl,--enable-new-dtags ?
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# -Wl,-z,combreloc ?
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# -Wl,-soname="libbusybox.so.$BB_VER"
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# -static Not used, but may be useful! manpage:
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# "... This option can be used with -shared.
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# Doing so means that a shared library
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# is being created but that all of the library's
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# external references must be resolved by pulling
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# in entries from static libraries."
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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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@ -28,8 +64,10 @@ echo "Trying libraries: $LDLIBS"
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l_list=`echo "$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"
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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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-o $EXE \
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-Wl,--sort-common \
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-Wl,--sort-section -Wl,alignment \
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-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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|| {
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@ -50,8 +88,10 @@ while test "$LDLIBS"; do
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test "x$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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-o $EXE \
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-Wl,--sort-common \
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-Wl,--sort-section -Wl,alignment \
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-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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if test $? = 0; then
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@ -77,10 +117,15 @@ test "x$l_list" != "x" && l_list="-Wl,--start-group $l_list -Wl,--end-group"
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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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-o $EXE \
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-Wl,--sort-common \
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-Wl,--sort-section -Wl,alignment \
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-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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$l_list \
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-Wl,--warn-common \
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-Wl,-Map -Wl,$EXE.map \
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-Wl,--verbose \
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|| {
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cat $EXE.out
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exit 1
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@ -92,12 +137,18 @@ else
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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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# Hmm, "ld --sort-section alignment" should do it too.
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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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-o $EXE \
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-Wl,--sort-common \
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-Wl,--sort-section -Wl,alignment \
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-Wl,--gc-sections \
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-Wl,-T -Wl,busybox_ldscript \
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-Wl,--start-group $O_FILES $A_FILES -Wl,--end-group \
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$l_list \
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-Wl,--warn-common \
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-Wl,-Map -Wl,$EXE.map \
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-Wl,--verbose \
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cat $EXE.out
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exit 1
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@ -118,12 +169,18 @@ if test "$CONFIG_BUILD_LIBBUSYBOX" = y; then
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EXE="$sharedlib_dir/libbusybox.so.${BB_VER}_unstripped"
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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.$BB_VER" \
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-o $EXE \
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-shared -fPIC \
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-Wl,--enable-new-dtags \
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-Wl,-z,combreloc \
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-Wl,-soname="libbusybox.so.$BB_VER" \
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-Wl,--sort-common \
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-Wl,--sort-section -Wl,alignment \
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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 \
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-Wl,--warn-common \
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-Wl,-Map -Wl,$EXE.map \
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-Wl,--verbose \
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echo "Linking $EXE failed"
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cat $EXE.out
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@ -137,11 +194,15 @@ fi
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if test "$CONFIG_FEATURE_SHARED_BUSYBOX" = y; then
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EXE="$sharedlib_dir/busybox_unstripped"
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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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-o $EXE \
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-Wl,--sort-common \
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-Wl,--sort-section -Wl,alignment \
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-Wl,--gc-sections \
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-Wl,--start-group $O_FILES -Wl,--end-group \
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-Wl,--verbose \
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-L"$sharedlib_dir" -lbusybox \
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-Wl,--warn-common \
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-Wl,-Map -Wl,$EXE.map \
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-Wl,--verbose \
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|| {
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echo "Linking $EXE failed"
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cat $EXE.out
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@ -175,8 +236,11 @@ int main(int argc, char **argv)
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EXE="$sharedlib_dir/$name"
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try $CC $LDFLAGS "$sharedlib_dir/applet.c" \
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-o $EXE \
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-Wl,--warn-common -Wl,--sort-common -Wl,--gc-sections \
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-Wl,--sort-common \
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-Wl,--sort-section -Wl,alignment \
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-Wl,--gc-sections \
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-L"$sharedlib_dir" -lbusybox \
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-Wl,--warn-common \
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echo "Linking $EXE failed"
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cat $EXE.out
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