2006-10-05 10:17:08 +00:00
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#!/bin/sh
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debug=false
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2007-10-09 13:49:26 +00:00
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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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2007-10-09 18:01:13 +00:00
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# -On Not used, maybe useful?
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2007-10-09 13:49:26 +00:00
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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 $A_FILES --end-group
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#
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# Shared library link:
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# -shared self-explanatory
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# -fPIC position-independent code
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2007-10-10 14:41:07 +00:00
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# --enable-new-dtags ?
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# -z,combreloc ?
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# -soname="libbusybox.so.$BB_VER"
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2007-10-11 10:05:36 +00:00
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# --undefined=lbb_main Seed name to start pulling from
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2007-10-10 14:41:07 +00:00
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# (otherwise we'll need --whole-archive)
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# -static Not used, but may be useful! manpage:
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2007-10-09 13:49:26 +00:00
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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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2007-02-25 00:40:37 +00:00
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try() {
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2007-10-07 17:05:22 +00:00
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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: $*"
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2008-10-23 13:49:21 +00:00
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$@ >>$EXE.out 2>&1
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return $?
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2006-10-05 10:17:08 +00:00
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}
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2007-11-13 17:36:12 +00:00
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check_cc() {
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2015-03-16 21:46:17 +00:00
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local tempname="$(mktemp)"
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2015-10-20 14:16:16 +00:00
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local r
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echo "int main(int argc,char**argv){return argv?argc:0;}" >"$tempname".c
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2008-02-13 07:47:37 +00:00
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# Can use "-o /dev/null", but older gcc tend to *unlink it* on failure! :(
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2015-10-20 14:16:16 +00:00
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# Was using "-xc /dev/null", but we need a valid C program.
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2015-10-20 16:15:01 +00:00
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# "eval" may be needed if CFLAGS can contain
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2015-10-20 14:16:16 +00:00
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# '... -D"BB_VER=KBUILD_STR(1.N.M)" ...'
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# and we need shell to process quotes!
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2015-12-01 16:25:10 +00:00
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$CC $CFLAGS $LDFLAGS $1 "$tempname".c -o "$tempname" >/dev/null 2>&1
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2015-10-20 14:16:16 +00:00
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r=$?
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rm -f "$tempname" "$tempname".c "$tempname".o
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return $r
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2007-11-13 17:36:12 +00:00
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}
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2007-12-28 17:04:42 +00:00
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check_libc_is_glibc() {
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2015-03-16 21:46:17 +00:00
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local tempname="$(mktemp)"
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2015-10-20 14:16:16 +00:00
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local r
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2007-12-28 17:04:42 +00:00
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echo "\
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#include <stdlib.h>
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/* Apparently uclibc defines __GLIBC__ (compat trick?). Oh well. */
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#if defined(__GLIBC__) && !defined(__UCLIBC__)
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syntax error here
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#endif
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2008-04-30 00:15:56 +00:00
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" >"$tempname".c
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2015-10-20 14:40:43 +00:00
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! $CC $CFLAGS "$tempname".c -c -o "$tempname".o >/dev/null 2>&1
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2015-10-20 14:16:16 +00:00
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r=$?
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rm -f "$tempname" "$tempname".c "$tempname".o
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return $r
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2007-12-28 17:04:42 +00:00
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}
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2007-10-07 17:05:22 +00:00
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EXE="$1"
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CC="$2"
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2008-02-14 12:24:14 +00:00
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CFLAGS="$3"
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LDFLAGS="$4"
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O_FILES="$5"
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A_FILES="$6"
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LDLIBS="$7"
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2007-10-07 17:05:22 +00:00
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2008-04-30 00:15:56 +00:00
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# The --sort-section option is not supported by older versions of ld
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2015-10-20 14:16:16 +00:00
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SORT_SECTION="-Wl,--sort-section,alignment"
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if ! check_cc "-Wl,--sort-section,alignment"; then
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echo "Your linker does not support --sort-section,alignment"
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SORT_SECTION=""
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fi
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2007-11-13 17:36:12 +00:00
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2010-06-19 05:36:10 +00:00
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START_GROUP="-Wl,--start-group"
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END_GROUP="-Wl,--end-group"
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INFO_OPTS="-Wl,--warn-common -Wl,-Map,$EXE.map -Wl,--verbose"
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2010-05-21 10:11:34 +00:00
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# gold may not support --sort-common (yet)
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2015-10-20 14:16:16 +00:00
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SORT_COMMON="-Wl,--sort-common"
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if ! check_cc "-Wl,--sort-common"; then
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echo "Your linker does not support --sort-common"
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SORT_COMMON=""
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fi
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2010-05-21 10:11:34 +00:00
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2007-12-28 17:04:42 +00:00
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# Static linking against glibc produces buggy executables
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# (glibc does not cope well with ld --gc-sections).
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# See sources.redhat.com/bugzilla/show_bug.cgi?id=3400
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# Note that glibc is unsuitable for static linking anyway.
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# We are removing -Wl,--gc-sections from link command line.
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2015-10-20 14:16:16 +00:00
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GC_SECTIONS="-Wl,--gc-sections"
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if (. ./.config && test x"$CONFIG_STATIC" = x"y") then
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if check_libc_is_glibc; then
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echo "Static linking against glibc, can't use --gc-sections"
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GC_SECTIONS=""
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fi
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2007-12-28 17:04:42 +00:00
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fi
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2009-06-26 22:24:35 +00:00
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# The --gc-sections option is not supported by older versions of ld
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if test -n "$GC_SECTIONS"; then
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2015-10-20 14:16:16 +00:00
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if ! check_cc "$GC_SECTIONS"; then
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echo "Your linker does not support $GC_SECTIONS"
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GC_SECTIONS=""
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fi
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2009-06-26 22:24:35 +00:00
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fi
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2007-07-17 20:39:27 +00:00
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# Sanitize lib list (dups, extra spaces etc)
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2007-10-07 17:05:42 +00:00
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LDLIBS=`echo "$LDLIBS" | xargs -n1 | sort | uniq | xargs`
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2007-07-17 20:39:27 +00:00
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# First link with all libs. If it fails, bail out
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2007-10-07 17:05:42 +00:00
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echo "Trying libraries: $LDLIBS"
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2007-10-07 17:05:22 +00:00
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# "lib1 lib2 lib3" -> "-llib1 -llib2 -llib3"
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2013-09-12 04:29:40 +00:00
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l_list=`echo " $LDLIBS " | sed -e 's: \([^- ][^ ]*\): -l\1:g'`
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2010-06-19 05:36:10 +00:00
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test "x$l_list" != "x" && l_list="$START_GROUP $l_list $END_GROUP"
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2008-02-14 12:24:14 +00:00
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try $CC $CFLAGS $LDFLAGS \
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2007-10-09 13:49:26 +00:00
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-o $EXE \
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2010-05-21 10:11:34 +00:00
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$SORT_COMMON \
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2007-11-13 17:36:12 +00:00
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$SORT_SECTION \
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2008-04-30 00:15:56 +00:00
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$GC_SECTIONS \
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2010-06-19 05:36:10 +00:00
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$START_GROUP $O_FILES $A_FILES $END_GROUP \
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2007-10-07 17:05:22 +00:00
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$l_list \
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2007-07-17 20:39:27 +00:00
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|| {
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2008-03-21 18:29:01 +00:00
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echo "Failed: $l_list"
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2007-10-07 17:05:22 +00:00
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cat $EXE.out
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2016-04-03 13:38:53 +00:00
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echo 'Note: if build needs additional libraries, put them in CONFIG_EXTRA_LDLIBS.'
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echo 'Example: CONFIG_EXTRA_LDLIBS="pthread dl tirpc audit pam"'
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2007-07-17 20:39:27 +00:00
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exit 1
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}
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2007-08-12 20:58:27 +00:00
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2007-08-06 03:41:08 +00:00
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# Now try to remove each lib and build without it.
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2007-07-17 20:39:27 +00:00
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# Stop when no lib can be removed.
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2007-10-07 17:05:42 +00:00
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while test "$LDLIBS"; do
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$debug && echo "Trying libraries: $LDLIBS"
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2007-07-17 20:39:27 +00:00
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all_needed=true
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2008-06-14 15:50:55 +00:00
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last_needed=false
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2007-10-07 17:05:42 +00:00
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for one in $LDLIBS; do
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without_one=`echo " $LDLIBS " | sed "s/ $one / /g" | xargs`
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2007-10-07 17:05:22 +00:00
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# "lib1 lib2 lib3" -> "-llib1 -llib2 -llib3"
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2013-09-12 04:29:40 +00:00
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l_list=`echo " $without_one " | sed -e 's: \([^- ][^ ]*\): -l\1:g'`
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2010-06-19 05:36:10 +00:00
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test x"$l_list" != x"" && l_list="$START_GROUP $l_list $END_GROUP"
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2007-09-02 14:51:54 +00:00
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$debug && echo "Trying -l options: '$l_list'"
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2008-02-14 12:24:14 +00:00
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try $CC $CFLAGS $LDFLAGS \
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2007-10-09 13:49:26 +00:00
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-o $EXE \
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2010-05-21 10:11:34 +00:00
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$SORT_COMMON \
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2007-11-13 17:36:12 +00:00
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$SORT_SECTION \
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2008-04-30 00:15:56 +00:00
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$GC_SECTIONS \
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2010-06-19 05:36:10 +00:00
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$START_GROUP $O_FILES $A_FILES $END_GROUP \
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2007-10-09 13:08:02 +00:00
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$l_list
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2007-10-07 17:05:22 +00:00
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if test $? = 0; then
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2008-08-26 20:09:08 +00:00
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echo " Library $one is not needed, excluding it"
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2007-10-07 17:05:42 +00:00
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LDLIBS="$without_one"
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2007-10-07 17:05:22 +00:00
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all_needed=false
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2008-06-14 15:50:55 +00:00
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last_needed=false
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2007-07-17 20:39:27 +00:00
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else
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2008-08-26 20:09:08 +00:00
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echo " Library $one is needed, can't exclude it (yet)"
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2008-06-14 15:50:55 +00:00
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last_needed=true
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2007-07-17 20:39:27 +00:00
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fi
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done
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# All libs were needed, can't remove any
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$all_needed && break
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2008-06-14 15:50:55 +00:00
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# Optimization: was the last tried lib needed?
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if $last_needed; then
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# Was it the only one lib left? Don't test again then.
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{ echo "$LDLIBS" | grep -q ' '; } || break
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fi
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2007-07-17 20:39:27 +00:00
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done
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2007-09-03 11:28:14 +00:00
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# Make the binary with final, minimal list of libs
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2007-11-18 06:42:56 +00:00
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echo "Final link with: ${LDLIBS:-<none>}"
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2013-09-12 04:29:40 +00:00
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l_list=`echo " $LDLIBS " | sed -e 's: \([^- ][^ ]*\): -l\1:g'`
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2010-06-19 05:36:10 +00:00
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test "x$l_list" != "x" && l_list="$START_GROUP $l_list $END_GROUP"
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2007-09-03 11:28:14 +00:00
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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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2008-02-14 12:24:14 +00:00
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try $CC $CFLAGS $LDFLAGS \
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2007-10-09 13:49:26 +00:00
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-o $EXE \
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2010-05-21 10:11:34 +00:00
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$SORT_COMMON \
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2007-11-13 17:36:12 +00:00
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$SORT_SECTION \
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2008-04-30 00:15:56 +00:00
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$GC_SECTIONS \
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2010-06-19 05:36:10 +00:00
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$START_GROUP $O_FILES $A_FILES $END_GROUP \
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2007-10-09 13:49:26 +00:00
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$l_list \
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2010-06-19 05:36:10 +00:00
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$INFO_OPTS \
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2007-10-09 13:08:02 +00:00
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|| {
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cat $EXE.out
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exit 1
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}
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2007-09-03 11:28:14 +00:00
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else
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echo "Custom linker script 'busybox_ldscript' found, using it"
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2007-10-07 17:05:42 +00:00
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# Add SORT_BY_ALIGNMENT to linker script (found in $EXE.out):
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2007-09-03 11:28:14 +00:00
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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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2007-10-07 17:05:42 +00:00
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# This will eliminate most of the padding (~3kb).
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2007-10-09 13:49:26 +00:00
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# Hmm, "ld --sort-section alignment" should do it too.
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2016-04-22 00:00:04 +00:00
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#
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# There is a ld hack which is meant to decrease disk usage
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# at the cost of more RAM usage (??!!) in standard ld script:
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# /* Adjust the address for the data segment. We want to adjust up to
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# the same address within the page on the next page up. */
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# . = ALIGN (0x1000) - ((0x1000 - .) & (0x1000 - 1)); . = DATA_SEGMENT_ALIGN (0x1000, 0x1000);
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# Replace it with:
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# . = ALIGN (0x1000); . = DATA_SEGMENT_ALIGN (0x1000, 0x1000);
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# to unconditionally align .data to the next page boundary,
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# instead of "next page, plus current offset in this page"
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2008-02-14 12:24:14 +00:00
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try $CC $CFLAGS $LDFLAGS \
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2007-10-09 13:49:26 +00:00
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-o $EXE \
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2010-05-21 10:11:34 +00:00
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$SORT_COMMON \
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2007-11-13 17:36:12 +00:00
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$SORT_SECTION \
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2008-04-30 00:15:56 +00:00
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$GC_SECTIONS \
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2008-05-09 12:43:04 +00:00
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-Wl,-T,busybox_ldscript \
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2010-06-19 05:36:10 +00:00
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$START_GROUP $O_FILES $A_FILES $END_GROUP \
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2007-10-09 13:49:26 +00:00
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$l_list \
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2010-06-19 05:36:10 +00:00
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$INFO_OPTS \
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2007-10-09 13:08:02 +00:00
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|| {
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cat $EXE.out
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exit 1
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}
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2007-09-03 11:28:14 +00:00
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fi
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2007-10-07 17:05:22 +00:00
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2007-10-09 18:01:13 +00:00
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. ./.config
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2007-10-07 17:05:22 +00:00
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2007-10-07 17:06:01 +00:00
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sharedlib_dir="0_lib"
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if test "$CONFIG_BUILD_LIBBUSYBOX" = y; then
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mkdir "$sharedlib_dir" 2>/dev/null
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test -d "$sharedlib_dir" || {
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echo "Cannot make directory $sharedlib_dir"
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exit 1
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}
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ln -s "libbusybox.so.$BB_VER" "$sharedlib_dir"/libbusybox.so 2>/dev/null
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EXE="$sharedlib_dir/libbusybox.so.${BB_VER}_unstripped"
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2008-02-14 12:24:14 +00:00
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try $CC $CFLAGS $LDFLAGS \
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2007-10-09 13:49:26 +00:00
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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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2007-10-11 10:05:36 +00:00
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-Wl,--undefined=lbb_main \
|
2010-05-21 10:11:34 +00:00
|
|
|
$SORT_COMMON \
|
2007-11-13 17:36:12 +00:00
|
|
|
$SORT_SECTION \
|
2010-06-19 05:36:10 +00:00
|
|
|
$START_GROUP $A_FILES $END_GROUP \
|
2007-10-09 13:49:26 +00:00
|
|
|
$l_list \
|
2010-06-19 05:36:10 +00:00
|
|
|
$INFO_OPTS \
|
2007-10-07 17:06:01 +00:00
|
|
|
|| {
|
|
|
|
echo "Linking $EXE failed"
|
|
|
|
cat $EXE.out
|
|
|
|
exit 1
|
|
|
|
}
|
2007-10-10 10:05:35 +00:00
|
|
|
$STRIP -s --remove-section=.note --remove-section=.comment $EXE -o "$sharedlib_dir/libbusybox.so.$BB_VER"
|
2007-10-07 20:46:34 +00:00
|
|
|
chmod a+x "$sharedlib_dir/libbusybox.so.$BB_VER"
|
2007-10-07 17:06:01 +00:00
|
|
|
echo "libbusybox: $sharedlib_dir/libbusybox.so.$BB_VER"
|
|
|
|
fi
|
2007-10-07 17:05:22 +00:00
|
|
|
|
2007-10-07 17:06:01 +00:00
|
|
|
if test "$CONFIG_FEATURE_SHARED_BUSYBOX" = y; then
|
|
|
|
EXE="$sharedlib_dir/busybox_unstripped"
|
2008-02-14 12:24:14 +00:00
|
|
|
try $CC $CFLAGS $LDFLAGS \
|
2007-10-09 13:49:26 +00:00
|
|
|
-o $EXE \
|
2010-05-21 10:11:34 +00:00
|
|
|
$SORT_COMMON \
|
2007-11-13 17:36:12 +00:00
|
|
|
$SORT_SECTION \
|
2008-04-30 00:15:56 +00:00
|
|
|
$GC_SECTIONS \
|
2010-06-19 05:36:10 +00:00
|
|
|
$START_GROUP $O_FILES $END_GROUP \
|
2007-10-09 13:49:26 +00:00
|
|
|
-L"$sharedlib_dir" -lbusybox \
|
2011-05-08 23:42:12 +00:00
|
|
|
$l_list \
|
2010-06-19 05:36:10 +00:00
|
|
|
$INFO_OPTS \
|
2007-10-07 17:06:01 +00:00
|
|
|
|| {
|
|
|
|
echo "Linking $EXE failed"
|
|
|
|
cat $EXE.out
|
|
|
|
exit 1
|
|
|
|
}
|
2007-10-10 10:05:35 +00:00
|
|
|
$STRIP -s --remove-section=.note --remove-section=.comment $EXE -o "$sharedlib_dir/busybox"
|
2007-10-07 17:06:01 +00:00
|
|
|
echo "busybox linked against libbusybox: $sharedlib_dir/busybox"
|
|
|
|
fi
|
2007-10-07 17:06:26 +00:00
|
|
|
|
|
|
|
if test "$CONFIG_FEATURE_INDIVIDUAL" = y; then
|
2007-10-08 22:16:14 +00:00
|
|
|
echo "Linking individual applets against libbusybox (see $sharedlib_dir/*)"
|
2014-04-19 13:04:39 +00:00
|
|
|
gcc -DNAME_MAIN -E -include include/autoconf.h include/applets.h \
|
2007-10-07 17:06:26 +00:00
|
|
|
| grep -v "^#" \
|
|
|
|
| grep -v "^$" \
|
2007-10-08 22:16:14 +00:00
|
|
|
> applet_lst.tmp
|
2007-10-07 21:00:41 +00:00
|
|
|
while read name main junk; do
|
2007-10-07 17:06:26 +00:00
|
|
|
|
|
|
|
echo "\
|
2007-10-11 10:06:26 +00:00
|
|
|
void lbb_prepare(const char *applet, char **argv);
|
2007-10-07 20:46:34 +00:00
|
|
|
int $main(int argc, char **argv);
|
2007-10-07 17:06:26 +00:00
|
|
|
|
|
|
|
int main(int argc, char **argv)
|
|
|
|
{
|
2007-10-11 10:06:26 +00:00
|
|
|
lbb_prepare(\"$name\", argv);
|
2007-10-07 20:46:34 +00:00
|
|
|
return $main(argc, argv);
|
2007-10-07 17:06:26 +00:00
|
|
|
}
|
|
|
|
" >"$sharedlib_dir/applet.c"
|
|
|
|
|
|
|
|
EXE="$sharedlib_dir/$name"
|
2008-02-14 12:24:14 +00:00
|
|
|
try $CC $CFLAGS $LDFLAGS "$sharedlib_dir/applet.c" \
|
2007-10-09 13:49:26 +00:00
|
|
|
-o $EXE \
|
2010-05-21 10:11:34 +00:00
|
|
|
$SORT_COMMON \
|
2007-11-13 17:36:12 +00:00
|
|
|
$SORT_SECTION \
|
2008-04-30 00:15:56 +00:00
|
|
|
$GC_SECTIONS \
|
2007-10-09 13:49:26 +00:00
|
|
|
-L"$sharedlib_dir" -lbusybox \
|
|
|
|
-Wl,--warn-common \
|
2007-10-07 17:06:26 +00:00
|
|
|
|| {
|
|
|
|
echo "Linking $EXE failed"
|
2007-10-09 10:15:41 +00:00
|
|
|
cat $EXE.out
|
2007-10-07 17:06:26 +00:00
|
|
|
exit 1
|
|
|
|
}
|
|
|
|
rm -- "$sharedlib_dir/applet.c" $EXE.out
|
2007-10-10 10:05:35 +00:00
|
|
|
$STRIP -s --remove-section=.note --remove-section=.comment $EXE
|
2014-05-03 14:35:15 +00:00
|
|
|
# Let user see that we do something - list the names of created binaries:
|
|
|
|
echo "$EXE"
|
2007-10-07 17:06:26 +00:00
|
|
|
|
2007-10-08 22:16:14 +00:00
|
|
|
done <applet_lst.tmp
|
2007-10-07 17:06:26 +00:00
|
|
|
fi
|
2007-10-07 20:46:34 +00:00
|
|
|
|
|
|
|
# libbusybox.so is needed only for -lbusybox at link time,
|
|
|
|
# it is not needed at runtime. Deleting to reduce confusion.
|
2007-10-09 10:15:41 +00:00
|
|
|
rm "$sharedlib_dir"/libbusybox.so 2>/dev/null
|
|
|
|
exit 0 # or else we may confuse make
|