X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=scripts%2Ftrylink;h=48c487bcd30f92f3029bf7f18a704da15a498264;hb=e1603156ff96672375970f460716d37a50c63fae;hp=f57a8a1607bbe3d0ef62d9603c09d9045903f7b9;hpb=49d15890e0e445baccc93080e2b99899374fa8ec;p=oweals%2Fbusybox.git diff --git a/scripts/trylink b/scripts/trylink index f57a8a160..48c487bcd 100755 --- a/scripts/trylink +++ b/scripts/trylink @@ -41,28 +41,75 @@ try() { printf "%s\n" "$*" >>$EXE.out printf "%s\n" "==========" >>$EXE.out $debug && echo "Trying: $*" - "$@" >>$EXE.out 2>&1 - exitcode=$? - return $exitcode + $@ >>$EXE.out 2>&1 + return $? } check_cc() { - if $CC $1 -shared -o /dev/null -xc /dev/null > /dev/null 2>&1; then - echo "$1"; + local tempname="$(mktemp)" + # Can use "-o /dev/null", but older gcc tend to *unlink it* on failure! :( + # "-xc": C language. "/dev/null" is an empty source file. + if $CC $CPPFLAGS $CFLAGS $1 -shared -xc /dev/null -o "$tempname".o >/dev/null 2>&1; then + echo "$1"; else - echo "$2"; + echo "$2"; fi + rm -f "$tempname" "$tempname".o +} + +check_libc_is_glibc() { + local tempname="$(mktemp)" + echo "\ + #include + /* Apparently uclibc defines __GLIBC__ (compat trick?). Oh well. */ + #if defined(__GLIBC__) && !defined(__UCLIBC__) + syntax error here + #endif + " >"$tempname".c + if $CC $CPPFLAGS $CFLAGS "$tempname".c -c -o "$tempname".o >/dev/null 2>&1; then + echo "$2"; + else + echo "$1"; + fi + rm -f "$tempname" "$tempname".[co] } EXE="$1" CC="$2" -LDFLAGS="$3" -O_FILES="$4" -A_FILES="$5" -LDLIBS="$6" +CFLAGS="$3" +LDFLAGS="$4" +O_FILES="$5" +A_FILES="$6" +LDLIBS="$7" + +# The --sort-section option is not supported by older versions of ld +SORT_SECTION=`check_cc "-Wl,--sort-section,alignment" ""` + +START_GROUP="-Wl,--start-group" +END_GROUP="-Wl,--end-group" +INFO_OPTS="-Wl,--warn-common -Wl,-Map,$EXE.map -Wl,--verbose" + +# gold may not support --sort-common (yet) +SORT_COMMON=`check_cc "-Wl,--sort-common" ""` -# The -Wl,--sort-section option is not supported by older versions of ld -SORT_SECTION=`check_cc "-Wl,--sort-section -Wl,alignment" ""` +# Static linking against glibc produces buggy executables +# (glibc does not cope well with ld --gc-sections). +# See sources.redhat.com/bugzilla/show_bug.cgi?id=3400 +# Note that glibc is unsuitable for static linking anyway. +# We are removing -Wl,--gc-sections from link command line. +GC_SECTIONS=`( +. ./.config +if test x"$CONFIG_STATIC" = x"y"; then + check_libc_is_glibc "" "-Wl,--gc-sections" +else + echo "-Wl,--gc-sections" +fi +)` + +# The --gc-sections option is not supported by older versions of ld +if test -n "$GC_SECTIONS"; then + GC_SECTIONS=`check_cc "$GC_SECTIONS" ""` +fi # Sanitize lib list (dups, extra spaces etc) LDLIBS=`echo "$LDLIBS" | xargs -n1 | sort | uniq | xargs` @@ -70,17 +117,17 @@ 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 \ +l_list=`echo " $LDLIBS " | sed -e 's: \([^- ][^ ]*\): -l\1:g'` +test "x$l_list" != "x" && l_list="$START_GROUP $l_list $END_GROUP" +try $CC $CFLAGS $LDFLAGS \ -o $EXE \ - -Wl,--sort-common \ + $SORT_COMMON \ $SORT_SECTION \ - -Wl,--gc-sections \ - -Wl,--start-group $O_FILES $A_FILES -Wl,--end-group \ + $GC_SECTIONS \ + $START_GROUP $O_FILES $A_FILES $END_GROUP \ $l_list \ || { - echo "Failed: $* $l_list" + echo "Failed: $l_list" cat $EXE.out exit 1 } @@ -90,51 +137,53 @@ try $CC $LDFLAGS \ while test "$LDLIBS"; do $debug && echo "Trying libraries: $LDLIBS" all_needed=true + last_needed=false 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" + l_list=`echo " $without_one " | sed -e 's: \([^- ][^ ]*\): -l\1:g'` + test x"$l_list" != x"" && l_list="$START_GROUP $l_list $END_GROUP" $debug && echo "Trying -l options: '$l_list'" - try $CC $LDFLAGS \ + try $CC $CFLAGS $LDFLAGS \ -o $EXE \ - -Wl,--sort-common \ + $SORT_COMMON \ $SORT_SECTION \ - -Wl,--gc-sections \ - -Wl,--start-group $O_FILES $A_FILES -Wl,--end-group \ + $GC_SECTIONS \ + $START_GROUP $O_FILES $A_FILES $END_GROUP \ $l_list if test $? = 0; then - echo " Library $one is not needed" + echo " Library $one is not needed, excluding it" LDLIBS="$without_one" all_needed=false + last_needed=false else - echo " Library $one is needed" + echo " Library $one is needed, can't exclude it (yet)" + last_needed=true 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 + # Optimization: was the last tried lib needed? + if $last_needed; then + # Was it the only one lib left? Don't test again then. + { echo "$LDLIBS" | grep -q ' '; } || break + fi 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" +l_list=`echo " $LDLIBS " | sed -e 's: \([^- ][^ ]*\): -l\1:g'` +test "x$l_list" != "x" && l_list="$START_GROUP $l_list $END_GROUP" # --verbose gives us gobs of info to stdout (e.g. linker script used) if ! test -f busybox_ldscript; then - try $CC $LDFLAGS \ + try $CC $CFLAGS $LDFLAGS \ -o $EXE \ - -Wl,--sort-common \ + $SORT_COMMON \ $SORT_SECTION \ - -Wl,--gc-sections \ - -Wl,--start-group $O_FILES $A_FILES -Wl,--end-group \ + $GC_SECTIONS \ + $START_GROUP $O_FILES $A_FILES $END_GROUP \ $l_list \ - -Wl,--warn-common \ - -Wl,-Map -Wl,$EXE.map \ - -Wl,--verbose \ + $INFO_OPTS \ || { cat $EXE.out exit 1 @@ -147,17 +196,15 @@ else # *(.bss SORT_BY_ALIGNMENT(.bss.*) .gnu.linkonce.b.*) # This will eliminate most of the padding (~3kb). # Hmm, "ld --sort-section alignment" should do it too. - try $CC $LDFLAGS \ + try $CC $CFLAGS $LDFLAGS \ -o $EXE \ - -Wl,--sort-common \ + $SORT_COMMON \ $SORT_SECTION \ - -Wl,--gc-sections \ - -Wl,-T -Wl,busybox_ldscript \ - -Wl,--start-group $O_FILES $A_FILES -Wl,--end-group \ + $GC_SECTIONS \ + -Wl,-T,busybox_ldscript \ + $START_GROUP $O_FILES $A_FILES $END_GROUP \ $l_list \ - -Wl,--warn-common \ - -Wl,-Map -Wl,$EXE.map \ - -Wl,--verbose \ + $INFO_OPTS \ || { cat $EXE.out exit 1 @@ -177,20 +224,18 @@ if test "$CONFIG_BUILD_LIBBUSYBOX" = y; then ln -s "libbusybox.so.$BB_VER" "$sharedlib_dir"/libbusybox.so 2>/dev/null EXE="$sharedlib_dir/libbusybox.so.${BB_VER}_unstripped" - try $CC $LDFLAGS \ + try $CC $CFLAGS $LDFLAGS \ -o $EXE \ -shared -fPIC \ -Wl,--enable-new-dtags \ -Wl,-z,combreloc \ -Wl,-soname="libbusybox.so.$BB_VER" \ -Wl,--undefined=lbb_main \ - -Wl,--sort-common \ + $SORT_COMMON \ $SORT_SECTION \ - -Wl,--start-group $A_FILES -Wl,--end-group \ + $START_GROUP $A_FILES $END_GROUP \ $l_list \ - -Wl,--warn-common \ - -Wl,-Map -Wl,$EXE.map \ - -Wl,--verbose \ + $INFO_OPTS \ || { echo "Linking $EXE failed" cat $EXE.out @@ -203,16 +248,15 @@ fi if test "$CONFIG_FEATURE_SHARED_BUSYBOX" = y; then EXE="$sharedlib_dir/busybox_unstripped" - try $CC $LDFLAGS \ + try $CC $CFLAGS $LDFLAGS \ -o $EXE \ - -Wl,--sort-common \ + $SORT_COMMON \ $SORT_SECTION \ - -Wl,--gc-sections \ - -Wl,--start-group $O_FILES -Wl,--end-group \ + $GC_SECTIONS \ + $START_GROUP $O_FILES $END_GROUP \ -L"$sharedlib_dir" -lbusybox \ - -Wl,--warn-common \ - -Wl,-Map -Wl,$EXE.map \ - -Wl,--verbose \ + $l_list \ + $INFO_OPTS \ || { echo "Linking $EXE failed" cat $EXE.out @@ -224,7 +268,7 @@ fi if test "$CONFIG_FEATURE_INDIVIDUAL" = y; then echo "Linking individual applets against libbusybox (see $sharedlib_dir/*)" - gcc -DNAME_MAIN_CNAME -E -include include/autoconf.h include/applets.h \ + gcc -DNAME_MAIN -E -include include/autoconf.h include/applets.h \ | grep -v "^#" \ | grep -v "^$" \ > applet_lst.tmp @@ -242,11 +286,11 @@ int main(int argc, char **argv) " >"$sharedlib_dir/applet.c" EXE="$sharedlib_dir/$name" - try $CC $LDFLAGS "$sharedlib_dir/applet.c" \ + try $CC $CFLAGS $LDFLAGS "$sharedlib_dir/applet.c" \ -o $EXE \ - -Wl,--sort-common \ + $SORT_COMMON \ $SORT_SECTION \ - -Wl,--gc-sections \ + $GC_SECTIONS \ -L"$sharedlib_dir" -lbusybox \ -Wl,--warn-common \ || { @@ -256,6 +300,8 @@ int main(int argc, char **argv) } rm -- "$sharedlib_dir/applet.c" $EXE.out $STRIP -s --remove-section=.note --remove-section=.comment $EXE + # Let user see that we do something - list the names of created binaries: + echo "$EXE" done