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Re: Bug in dynamic linker
On Thu, Jul 20, 2000 at 09:56:32AM -0700, Ulrich Drepper wrote:
> "H . J . Lu" <hjl@lucon.org> writes:
>
> > > I agree with Mark. The proposed change is creating much more severe
> > > problems than it's solving.
> >
> > Please show me the problem. A testcase will be very nice.
>
> Mark described it:
>
> - liba.so is built using libb.so (i.e., has a DT_NEEDED entry)
>
> - program foo is linked with liba.so
>
> - new version of liba.so out; same interface, but does not use libb.so
> anymore; libb.so is removed
>
Have you tried binutils from CVS today to see what it does? As I
have said, I have verified that program foo WON'T have a DT_NEEDED
entry for libb.so unless program foo uses symbols from libb.so
directly. As I said before, please send me a testcase to show it
is not the case.
BTW, I am enclosing my testcase here.
Thanks.
H.J.
--
#!/bin/sh
# This is a shell archive (produced by GNU sharutils 4.2.1).
# To extract the files from this archive, save it to some FILE, remove
# everything before the `!/bin/sh' line above, then type `sh FILE'.
#
# Made on 2000-07-20 10:00 PDT by <hjl@osmium.su.varesearch.com>.
# Source directory was `/home/hjl/bugs/gas/needed'.
#
# Existing files will *not* be overwritten unless `-c' is specified.
#
# This shar contains:
# length mode name
# ------ ---------- ------------------------------------------
# 131 -rw-r--r-- test.c
# 218 -rw-r--r-- threadlib.c
# 207 -rw-r--r-- threadtest.c
# 696 -rw-r--r-- Makefile
#
save_IFS="${IFS}"
IFS="${IFS}:"
gettext_dir=FAILED
locale_dir=FAILED
first_param="$1"
for dir in $PATH
do
if test "$gettext_dir" = FAILED && test -f $dir/gettext \
&& ($dir/gettext --version >/dev/null 2>&1)
then
set `$dir/gettext --version 2>&1`
if test "$3" = GNU
then
gettext_dir=$dir
fi
fi
if test "$locale_dir" = FAILED && test -f $dir/shar \
&& ($dir/shar --print-text-domain-dir >/dev/null 2>&1)
then
locale_dir=`$dir/shar --print-text-domain-dir`
fi
done
IFS="$save_IFS"
if test "$locale_dir" = FAILED || test "$gettext_dir" = FAILED
then
echo=echo
else
TEXTDOMAINDIR=$locale_dir
export TEXTDOMAINDIR
TEXTDOMAIN=sharutils
export TEXTDOMAIN
echo="$gettext_dir/gettext -s"
fi
if touch -am -t 200112312359.59 $$.touch >/dev/null 2>&1 && test ! -f 200112312359.59 -a -f $$.touch; then
shar_touch='touch -am -t $1$2$3$4$5$6.$7 "$8"'
elif touch -am 123123592001.59 $$.touch >/dev/null 2>&1 && test ! -f 123123592001.59 -a ! -f 123123592001.5 -a -f $$.touch; then
shar_touch='touch -am $3$4$5$6$1$2.$7 "$8"'
elif touch -am 1231235901 $$.touch >/dev/null 2>&1 && test ! -f 1231235901 -a -f $$.touch; then
shar_touch='touch -am $3$4$5$6$2 "$8"'
else
shar_touch=:
echo
$echo 'WARNING: not restoring timestamps. Consider getting and'
$echo "installing GNU \`touch', distributed in GNU File Utilities..."
echo
fi
rm -f 200112312359.59 123123592001.59 123123592001.5 1231235901 $$.touch
#
if mkdir _sh31904; then
$echo 'x -' 'creating lock directory'
else
$echo 'failed to create lock directory'
exit 1
fi
# ============= test.c ==============
if test -f 'test.c' && test "$first_param" != -c; then
$echo 'x -' SKIPPING 'test.c' '(file already exists)'
else
$echo 'x -' extracting 'test.c' '(text)'
sed 's/^X//' << 'SHAR_EOF' > 'test.c' &&
#include <stdio.h>
X
extern int dummy(void);
X
int main(int argc, char **argv) {
X printf("spec = %d\n", dummy());
X return 0;
}
SHAR_EOF
(set 20 00 07 18 14 15 54 'test.c'; eval "$shar_touch") &&
chmod 0644 'test.c' ||
$echo 'restore of' 'test.c' 'failed'
if ( md5sum --help 2>&1 | grep 'sage: md5sum \[' ) >/dev/null 2>&1 \
&& ( md5sum --version 2>&1 | grep -v 'textutils 1.12' ) >/dev/null; then
md5sum -c << SHAR_EOF >/dev/null 2>&1 \
|| $echo 'test.c:' 'MD5 check failed'
4b6bed819d069a08ecdba10903aac6b2 test.c
SHAR_EOF
else
shar_count="`LC_ALL= LC_CTYPE= LANG= wc -c < 'test.c'`"
test 131 -eq "$shar_count" ||
$echo 'test.c:' 'original size' '131,' 'current size' "$shar_count!"
fi
fi
# ============= threadlib.c ==============
if test -f 'threadlib.c' && test "$first_param" != -c; then
$echo 'x -' SKIPPING 'threadlib.c' '(file already exists)'
else
$echo 'x -' extracting 'threadlib.c' '(text)'
sed 's/^X//' << 'SHAR_EOF' > 'threadlib.c' &&
#include <pthread.h>
X
pthread_key_t mykey;
X
int dummy(void) {
X int spec;
X
X pthread_key_create(&mykey, NULL);
X pthread_setspecific(mykey, (void *)10);
X spec = (int)pthread_getspecific(mykey);
X return spec;
}
SHAR_EOF
(set 20 00 07 18 11 33 03 'threadlib.c'; eval "$shar_touch") &&
chmod 0644 'threadlib.c' ||
$echo 'restore of' 'threadlib.c' 'failed'
if ( md5sum --help 2>&1 | grep 'sage: md5sum \[' ) >/dev/null 2>&1 \
&& ( md5sum --version 2>&1 | grep -v 'textutils 1.12' ) >/dev/null; then
md5sum -c << SHAR_EOF >/dev/null 2>&1 \
|| $echo 'threadlib.c:' 'MD5 check failed'
19ecddd05773202c443a249d7583bc47 threadlib.c
SHAR_EOF
else
shar_count="`LC_ALL= LC_CTYPE= LANG= wc -c < 'threadlib.c'`"
test 218 -eq "$shar_count" ||
$echo 'threadlib.c:' 'original size' '218,' 'current size' "$shar_count!"
fi
fi
# ============= threadtest.c ==============
if test -f 'threadtest.c' && test "$first_param" != -c; then
$echo 'x -' SKIPPING 'threadtest.c' '(file already exists)'
else
$echo 'x -' extracting 'threadtest.c' '(text)'
sed 's/^X//' << 'SHAR_EOF' > 'threadtest.c' &&
#include <pthread.h>
#include <stdio.h>
X
extern int dummy(void);
X
pthread_t *me;
X
int main(int argc, char **argv) {
X printf("spec = %d\n", dummy());
X me = (pthread_t *) pthread_self();
X return 0;
}
SHAR_EOF
(set 20 00 07 18 11 36 40 'threadtest.c'; eval "$shar_touch") &&
chmod 0644 'threadtest.c' ||
$echo 'restore of' 'threadtest.c' 'failed'
if ( md5sum --help 2>&1 | grep 'sage: md5sum \[' ) >/dev/null 2>&1 \
&& ( md5sum --version 2>&1 | grep -v 'textutils 1.12' ) >/dev/null; then
md5sum -c << SHAR_EOF >/dev/null 2>&1 \
|| $echo 'threadtest.c:' 'MD5 check failed'
b9df452c72adac53de184bc4effa931a threadtest.c
SHAR_EOF
else
shar_count="`LC_ALL= LC_CTYPE= LANG= wc -c < 'threadtest.c'`"
test 207 -eq "$shar_count" ||
$echo 'threadtest.c:' 'original size' '207,' 'current size' "$shar_count!"
fi
fi
# ============= Makefile ==============
if test -f 'Makefile' && test "$first_param" != -c; then
$echo 'x -' SKIPPING 'Makefile' '(file already exists)'
else
$echo 'x -' extracting 'Makefile' '(text)'
sed 's/^X//' << 'SHAR_EOF' > 'Makefile' &&
CFLAGS=-O -B./
PIC=-fPIC
NODELETE=-Wl,-z,nodelete
X
PROGS= threadtest test
X
all: $(PROGS)
X for f in $(PROGS); do echo "Running: $$f"; ./$$f; \
X if [ $$? != 0 ]; then echo Failed; fi; done
X for f in $(PROGS); do echo "Running: ldd $$f"; ldd ./$$f; \
X if [ $$? != 0 ]; then echo Failed; fi; done
X
threadtest: threadtest.o libthreadlib.so
X $(CC) -o $@ $(CFLAGS) threadtest.o -L. -lthreadlib -Wl,-rpath,.
X
test: test.o libthreadlib.so
X $(CC) -o $@ $(CFLAGS) test.o -L. -lthreadlib #-Wl,-rpath,.
X
libthreadlib.so: threadlib.c
X $(CC) $(NODELETE) -shared -o $@ $(CFLAGS) $(PIC) $^ -lpthread
X
X.c.o:
X $(CC) $(CFLAGS) -c $<
X
clean:
X rm -f $(PROGS) *.so* *.o *.s *.a
X
shar:
X shar *.c Makefile > bug.shar
SHAR_EOF
(set 20 00 07 19 14 33 41 'Makefile'; eval "$shar_touch") &&
chmod 0644 'Makefile' ||
$echo 'restore of' 'Makefile' 'failed'
if ( md5sum --help 2>&1 | grep 'sage: md5sum \[' ) >/dev/null 2>&1 \
&& ( md5sum --version 2>&1 | grep -v 'textutils 1.12' ) >/dev/null; then
md5sum -c << SHAR_EOF >/dev/null 2>&1 \
|| $echo 'Makefile:' 'MD5 check failed'
2b653f2c654e24704696aa1416274039 Makefile
SHAR_EOF
else
shar_count="`LC_ALL= LC_CTYPE= LANG= wc -c < 'Makefile'`"
test 696 -eq "$shar_count" ||
$echo 'Makefile:' 'original size' '696,' 'current size' "$shar_count!"
fi
fi
rm -fr _sh31904
exit 0