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* A weak symbol bug in gas-950819
@ 1995-08-20 18:51 H.J. Lu
  1995-08-21  8:14 ` Ian Lance Taylor
  0 siblings, 1 reply; 2+ messages in thread
From: H.J. Lu @ 1995-08-20 18:51 UTC (permalink / raw)
  To: gas2; +Cc: Ian Lance Taylor

Hi,

There is a weak symbol bug in gas-950819. The old snapshots failed to
pick up the real definition under certain circumstances. gas-950819
failed to set the weak symbol to zero.

BTW, what an ELF linker should do with the symbol "xxx" in

ld .... -lfoo -lbar

where a real "xxx" is defined in libfoo.a, a weak one is defined in
libbar.a and "xxx" is referenced in libbar.a only?


-- 
H.J. Lu
NYNEX Science and Technology, Inc.			hjl@nynexst.com
----
#!/bin/sh
# This is a shell archive (produced by GNU sharutils 4.1).
# 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 1995-08-20 21:43 EDT by <hjl@didi>.
# Source directory was `/home/hjl/bugs/ld/weak'.
#
# Existing files will *not* be overwritten unless `-c' is specified.
#
# This shar contains:
# length mode       name
# ------ ---------- ------------------------------------------
#    353 -rw-r--r-- Makefile
#     78 -rw-r--r-- bar.c
#    100 -rw-r--r-- foo.c
#     32 -rw-r--r-- main.c
#     45 -rw-r--r-- main1.c
#     17 -rw-r--r-- x.c
#
touch -am 1231235999 $$.touch >/dev/null 2>&1
if test ! -f 1231235999 && test -f $$.touch; then
  shar_touch=touch
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 1231235999 $$.touch
#
# ============= Makefile ==============
if test -f 'Makefile' && test X"$1" != X"-c"; then
  echo 'x - skipping Makefile (file already exists)'
else
  echo 'x - extracting Makefile (text)'
  sed 's/^X//' << 'SHAR_EOF' > 'Makefile' &&
SRCS= foo.c x.c bar.c
OBJS=$(SRCS:.c=.o)
AR=ar
CFLAGS=
CC=gcc -ggdb
RANLIB =ranlib
X
X.c.o:
X	$(CC) $(CFLAGS) -c $<
X
all: f1 f2 f3
X
f1: libfoo.a
X	$(CC) -o $@ main.c -L. -lfoo
X
f2: libfoo.a
X	$(CC) -o $@ main.c x.o -L. -lfoo
X
f3: libfoo.a
X	$(CC) -o $@ main1.c -L. -lfoo
X
libfoo.a:$(OBJS)
X	$(AR) ucvr $@ $(OBJS)
X	$(RANLIB) $@
X
clean:
X	-rm -f *.o *.a f1 f2 f3
SHAR_EOF
  $shar_touch -am 0820213995 'Makefile' &&
  chmod 0644 'Makefile' ||
  echo 'restore of Makefile failed'
  shar_count="`wc -c < 'Makefile'`"
  test 353 -eq "$shar_count" ||
    echo "Makefile: original size 353, current size $shar_count"
fi
# ============= bar.c ==============
if test -f 'bar.c' && test X"$1" != X"-c"; then
  echo 'x - skipping bar.c (file already exists)'
else
  echo 'x - extracting bar.c (text)'
  sed 's/^X//' << 'SHAR_EOF' > 'bar.c' &&
#include <stdio.h>
X
extern int weak_x;
X
bar ()
{
X  printf ("%d\n", weak_x);
}
SHAR_EOF
  $shar_touch -am 0421213795 'bar.c' &&
  chmod 0644 'bar.c' ||
  echo 'restore of bar.c failed'
  shar_count="`wc -c < 'bar.c'`"
  test 78 -eq "$shar_count" ||
    echo "bar.c: original size 78, current size $shar_count"
fi
# ============= foo.c ==============
if test -f 'foo.c' && test X"$1" != X"-c"; then
  echo 'x - skipping foo.c (file already exists)'
else
  echo 'x - extracting foo.c (text)'
  sed 's/^X//' << 'SHAR_EOF' > 'foo.c' &&
#include <stdio.h>
X
#pragma weak weak_x
X
extern int  weak_x;
X
foo ()
{
X  printf ("%d\n", weak_x);
}
SHAR_EOF
  $shar_touch -am 0421213795 'foo.c' &&
  chmod 0644 'foo.c' ||
  echo 'restore of foo.c failed'
  shar_count="`wc -c < 'foo.c'`"
  test 100 -eq "$shar_count" ||
    echo "foo.c: original size 100, current size $shar_count"
fi
# ============= main.c ==============
if test -f 'main.c' && test X"$1" != X"-c"; then
  echo 'x - skipping main.c (file already exists)'
else
  echo 'x - extracting main.c (text)'
  sed 's/^X//' << 'SHAR_EOF' > 'main.c' &&
main ()
{
X  foo ();
X  bar ();
}
SHAR_EOF
  $shar_touch -am 0420012595 'main.c' &&
  chmod 0644 'main.c' ||
  echo 'restore of main.c failed'
  shar_count="`wc -c < 'main.c'`"
  test 32 -eq "$shar_count" ||
    echo "main.c: original size 32, current size $shar_count"
fi
# ============= main1.c ==============
if test -f 'main1.c' && test X"$1" != X"-c"; then
  echo 'x - skipping main1.c (file already exists)'
else
  echo 'x - extracting main1.c (text)'
  sed 's/^X//' << 'SHAR_EOF' > 'main1.c' &&
main ()
{
X  foo ();
#if 0
X  bar ();
#endif
}
SHAR_EOF
  $shar_touch -am 0421222395 'main1.c' &&
  chmod 0644 'main1.c' ||
  echo 'restore of main1.c failed'
  shar_count="`wc -c < 'main1.c'`"
  test 45 -eq "$shar_count" ||
    echo "main1.c: original size 45, current size $shar_count"
fi
# ============= x.c ==============
if test -f 'x.c' && test X"$1" != X"-c"; then
  echo 'x - skipping x.c (file already exists)'
else
  echo 'x - extracting x.c (text)'
  sed 's/^X//' << 'SHAR_EOF' > 'x.c' &&
int weak_x = 20;
SHAR_EOF
  $shar_touch -am 0421213795 'x.c' &&
  chmod 0644 'x.c' ||
  echo 'restore of x.c failed'
  shar_count="`wc -c < 'x.c'`"
  test 17 -eq "$shar_count" ||
    echo "x.c: original size 17, current size $shar_count"
fi
exit 0

^ permalink raw reply	[flat|nested] 2+ messages in thread
end of thread, other threads:[~1995-08-21  8:14 UTC | newest]

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1995-08-20 18:51 A weak symbol bug in gas-950819 H.J. Lu
1995-08-21  8:14 ` Ian Lance Taylor

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