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authorDenis Vlasenko <vda.linux@googlemail.com>2007-10-09 13:49:26 +0000
committerDenis Vlasenko <vda.linux@googlemail.com>2007-10-09 13:49:26 +0000
commit01f3b2c91a1b48fa730b3f0bd5da73b1210a5ac9 (patch)
treeb48778f931c79aa6705860436130a1443ecce790 /scripts/trylink
parentd19b87ece4add3dd24bea9d9d0b32946c219ef2c (diff)
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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
Diffstat (limited to 'scripts/trylink')
-rwxr-xr-xscripts/trylink114
1 files changed, 89 insertions, 25 deletions
diff --git a/scripts/trylink b/scripts/trylink
index 0829121ab..cbba9000a 100755
--- a/scripts/trylink
+++ b/scripts/trylink
@@ -2,6 +2,42 @@
2 2
3debug=false 3debug=false
4 4
5# Linker flags used:
6#
7# Informational:
8# --warn-common
9# -Map $EXE.map
10# --verbose
11#
12# Optimizations:
13# --sort-common reduces padding
14# --sort-section alignment reduces padding
15# --gc-sections throws out unused sections,
16# does not work for shared libs
17# -O Not used, maybe useful?
18#
19# List of files to link:
20# $l_list == --start-group -llib1 -llib2 --end-group
21# --start-group $O_FILES $A_FILES --end-group
22# or for shlib:
23# --start-group --whole-archive $A_FILES --no-whole-archive --end-group
24# otherwise we don't pull in all parts of *.a files. Now we pull in too much.
25# FIXME: make it work without --whole-archive, or better, with --gc-sections.
26#
27# Shared library link:
28# -shared self-explanatory
29# -fPIC position-independent code
30# -Wl,--enable-new-dtags ?
31# -Wl,-z,combreloc ?
32# -Wl,-soname="libbusybox.so.$BB_VER"
33# -static Not used, but may be useful! manpage:
34# "... This option can be used with -shared.
35# Doing so means that a shared library
36# is being created but that all of the library's
37# external references must be resolved by pulling
38# in entries from static libraries."
39
40
5try() { 41try() {
6 printf "%s\n" "Output of:" >$EXE.out 42 printf "%s\n" "Output of:" >$EXE.out
7 printf "%s\n" "$*" >>$EXE.out 43 printf "%s\n" "$*" >>$EXE.out
@@ -28,8 +64,10 @@ echo "Trying libraries: $LDLIBS"
28l_list=`echo "$LDLIBS" | sed -e 's/ / -l/g' -e 's/^/-l/' -e 's/^-l$//'` 64l_list=`echo "$LDLIBS" | sed -e 's/ / -l/g' -e 's/^/-l/' -e 's/^-l$//'`
29test "x$l_list" != "x" && l_list="-Wl,--start-group $l_list -Wl,--end-group" 65test "x$l_list" != "x" && l_list="-Wl,--start-group $l_list -Wl,--end-group"
30try $CC $LDFLAGS \ 66try $CC $LDFLAGS \
31 -o $EXE -Wl,-Map -Wl,$EXE.map \ 67 -o $EXE \
32 -Wl,--warn-common -Wl,--sort-common -Wl,--gc-sections \ 68 -Wl,--sort-common \
69 -Wl,--sort-section -Wl,alignment \
70 -Wl,--gc-sections \
33 -Wl,--start-group $O_FILES $A_FILES -Wl,--end-group \ 71 -Wl,--start-group $O_FILES $A_FILES -Wl,--end-group \
34 $l_list \ 72 $l_list \
35|| { 73|| {
@@ -50,8 +88,10 @@ while test "$LDLIBS"; do
50 test "x$l_list" != "x" && l_list="-Wl,--start-group $l_list -Wl,--end-group" 88 test "x$l_list" != "x" && l_list="-Wl,--start-group $l_list -Wl,--end-group"
51 $debug && echo "Trying -l options: '$l_list'" 89 $debug && echo "Trying -l options: '$l_list'"
52 try $CC $LDFLAGS \ 90 try $CC $LDFLAGS \
53 -o $EXE -Wl,-Map -Wl,$EXE.map \ 91 -o $EXE \
54 -Wl,--warn-common -Wl,--sort-common -Wl,--gc-sections \ 92 -Wl,--sort-common \
93 -Wl,--sort-section -Wl,alignment \
94 -Wl,--gc-sections \
55 -Wl,--start-group $O_FILES $A_FILES -Wl,--end-group \ 95 -Wl,--start-group $O_FILES $A_FILES -Wl,--end-group \
56 $l_list 96 $l_list
57 if test $? = 0; then 97 if test $? = 0; then
@@ -77,10 +117,15 @@ test "x$l_list" != "x" && l_list="-Wl,--start-group $l_list -Wl,--end-group"
77# --verbose gives us gobs of info to stdout (e.g. linker script used) 117# --verbose gives us gobs of info to stdout (e.g. linker script used)
78if ! test -f busybox_ldscript; then 118if ! test -f busybox_ldscript; then
79 try $CC $LDFLAGS \ 119 try $CC $LDFLAGS \
80 -o $EXE -Wl,-Map -Wl,$EXE.map \ 120 -o $EXE \
81 -Wl,--warn-common -Wl,--sort-common -Wl,--gc-sections \ 121 -Wl,--sort-common \
122 -Wl,--sort-section -Wl,alignment \
123 -Wl,--gc-sections \
82 -Wl,--start-group $O_FILES $A_FILES -Wl,--end-group \ 124 -Wl,--start-group $O_FILES $A_FILES -Wl,--end-group \
83 $l_list -Wl,--verbose \ 125 $l_list \
126 -Wl,--warn-common \
127 -Wl,-Map -Wl,$EXE.map \
128 -Wl,--verbose \
84 || { 129 || {
85 cat $EXE.out 130 cat $EXE.out
86 exit 1 131 exit 1
@@ -92,12 +137,18 @@ else
92 # *(.data SORT_BY_ALIGNMENT(.data.*) .gnu.linkonce.d.*) 137 # *(.data SORT_BY_ALIGNMENT(.data.*) .gnu.linkonce.d.*)
93 # *(.bss SORT_BY_ALIGNMENT(.bss.*) .gnu.linkonce.b.*) 138 # *(.bss SORT_BY_ALIGNMENT(.bss.*) .gnu.linkonce.b.*)
94 # This will eliminate most of the padding (~3kb). 139 # This will eliminate most of the padding (~3kb).
140 # Hmm, "ld --sort-section alignment" should do it too.
95 try $CC $LDFLAGS \ 141 try $CC $LDFLAGS \
96 -o $EXE -Wl,-Map -Wl,$EXE.map \ 142 -o $EXE \
97 -Wl,--warn-common -Wl,--sort-common -Wl,--gc-sections \ 143 -Wl,--sort-common \
98 -Wl,--start-group $O_FILES $A_FILES -Wl,--end-group \ 144 -Wl,--sort-section -Wl,alignment \
99 $l_list -Wl,--verbose \ 145 -Wl,--gc-sections \
100 -Wl,-T -Wl,busybox_ldscript \ 146 -Wl,-T -Wl,busybox_ldscript \
147 -Wl,--start-group $O_FILES $A_FILES -Wl,--end-group \
148 $l_list \
149 -Wl,--warn-common \
150 -Wl,-Map -Wl,$EXE.map \
151 -Wl,--verbose \
101 || { 152 || {
102 cat $EXE.out 153 cat $EXE.out
103 exit 1 154 exit 1
@@ -118,12 +169,18 @@ if test "$CONFIG_BUILD_LIBBUSYBOX" = y; then
118 169
119 EXE="$sharedlib_dir/libbusybox.so.${BB_VER}_unstripped" 170 EXE="$sharedlib_dir/libbusybox.so.${BB_VER}_unstripped"
120 try $CC $LDFLAGS \ 171 try $CC $LDFLAGS \
121 -o $EXE -Wl,-Map -Wl,$EXE.map \ 172 -o $EXE \
122 -shared -fPIC -Wl,--enable-new-dtags \ 173 -shared -fPIC \
123 -Wl,--start-group -Wl,--whole-archive $A_FILES -Wl,--no-whole-archive -Wl,--end-group \ 174 -Wl,--enable-new-dtags \
124 $l_list -Wl,--verbose \ 175 -Wl,-z,combreloc \
125 -Wl,-soname="libbusybox.so.$BB_VER" \ 176 -Wl,-soname="libbusybox.so.$BB_VER" \
126 -Wl,-z,combreloc \ 177 -Wl,--sort-common \
178 -Wl,--sort-section -Wl,alignment \
179 -Wl,--start-group -Wl,--whole-archive $A_FILES -Wl,--no-whole-archive -Wl,--end-group \
180 $l_list \
181 -Wl,--warn-common \
182 -Wl,-Map -Wl,$EXE.map \
183 -Wl,--verbose \
127 || { 184 || {
128 echo "Linking $EXE failed" 185 echo "Linking $EXE failed"
129 cat $EXE.out 186 cat $EXE.out
@@ -137,11 +194,15 @@ fi
137if test "$CONFIG_FEATURE_SHARED_BUSYBOX" = y; then 194if test "$CONFIG_FEATURE_SHARED_BUSYBOX" = y; then
138 EXE="$sharedlib_dir/busybox_unstripped" 195 EXE="$sharedlib_dir/busybox_unstripped"
139 try $CC $LDFLAGS \ 196 try $CC $LDFLAGS \
140 -o $EXE -Wl,-Map -Wl,$EXE.map \ 197 -o $EXE \
141 -Wl,--warn-common -Wl,--sort-common -Wl,--gc-sections \ 198 -Wl,--sort-common \
142 -Wl,--start-group $O_FILES -Wl,--end-group \ 199 -Wl,--sort-section -Wl,alignment \
143 -Wl,--verbose \ 200 -Wl,--gc-sections \
144 -L"$sharedlib_dir" -lbusybox \ 201 -Wl,--start-group $O_FILES -Wl,--end-group \
202 -L"$sharedlib_dir" -lbusybox \
203 -Wl,--warn-common \
204 -Wl,-Map -Wl,$EXE.map \
205 -Wl,--verbose \
145 || { 206 || {
146 echo "Linking $EXE failed" 207 echo "Linking $EXE failed"
147 cat $EXE.out 208 cat $EXE.out
@@ -174,9 +235,12 @@ int main(int argc, char **argv)
174 235
175 EXE="$sharedlib_dir/$name" 236 EXE="$sharedlib_dir/$name"
176 try $CC $LDFLAGS "$sharedlib_dir/applet.c" \ 237 try $CC $LDFLAGS "$sharedlib_dir/applet.c" \
177 -o $EXE \ 238 -o $EXE \
178 -Wl,--warn-common -Wl,--sort-common -Wl,--gc-sections \ 239 -Wl,--sort-common \
179 -L"$sharedlib_dir" -lbusybox \ 240 -Wl,--sort-section -Wl,alignment \
241 -Wl,--gc-sections \
242 -L"$sharedlib_dir" -lbusybox \
243 -Wl,--warn-common \
180 || { 244 || {
181 echo "Linking $EXE failed" 245 echo "Linking $EXE failed"
182 cat $EXE.out 246 cat $EXE.out
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2025-03-17 20:27:14 +0000