Graeme_Dixon@TRANSARC.COM (04/19/91)
I've discovered 2 bugs in the loader/ranlib, one minor, one not so
minor:
1. ranlib doesn't generate a table of contents if a libray
only contains variables. Trying to link against the library
produces a message like:
/bin/ld: warning empty table of contents: libfoo.a (can't load from it)
2. When a library contains uninitialized global variables, and
an application (or functions in the library) that uses the globals
is linked against that library, the linker can't locate the
(uninitialized) globals -- /bin/ld claims the variables are
undefined.
This only occurs for uninitialized globals -- if they are initialized
then the link succeeds.
The following simple program illustrates bug 2 (this program works
fine on other machines). It fails on NeXTStations and NeXTCubes
running both 2.0 and 2.1.
Anyone know a work-around for this?
Graeme N. Dixon (graeme@transarc.com)
Transarc Corporation
-------
#! /bin/sh
# This is a shell archive, meaning:
# 1. Remove everything above the #! /bin/sh line.
# 2. Save the resulting text in a file.
# 3. Execute the file with /bin/sh (not csh) to create the files:
# Makefile
# bar.c
# foo.c
# garbage.c
# This archive created: Thu Apr 18 10:39:09 1991
export PATH; PATH=/bin:$PATH
if test -f 'Makefile'
then
echo shar: will not over-write existing file "'Makefile'"
else
sed 's/^X//' << \SHAR_EOF > 'Makefile'
Xall : foo
X
Xfoo : foo.o libfoo.a
X cc -o foo foo.o libfoo.a
X
Xlibfoo.a : bar.o garbage.o
X ar r libfoo.a bar.o garbage.o
X ranlib libfoo.a
X
Xclean:
X rm -f foo.o bar.o garbage.o libfoo.a foo
SHAR_EOF
fi # end of overwriting check
if test -f 'bar.c'
then
echo shar: will not over-write existing file "'bar.c'"
else
sed 's/^X//' << \SHAR_EOF > 'bar.c'
Xint foobar;
SHAR_EOF
fi # end of overwriting check
if test -f 'foo.c'
then
echo shar: will not over-write existing file "'foo.c'"
else
sed 's/^X//' << \SHAR_EOF > 'foo.c'
Xextern int foobar;
X
Xmain()
X{
X printf("foobar is %d\n", foobar);
X}
SHAR_EOF
fi # end of overwriting check
if test -f 'garbage.c'
then
echo shar: will not over-write existing file "'garbage.c'"
else
sed 's/^X//' << \SHAR_EOF > 'garbage.c'
X/*
X * This file is necessary because the version of ranlib on the
X * NeXT won't generate a table of contents when there is the object
X * files in the library just contain variables. The ranlib suceeds, but
X * attempts to link with the library produce the following:
X
X/bin/ld: warning empty table of contents: libfoo.a (can't load from it)
X
X */
Xint garbage;
X
Xvoid arg()
X{
X garbage = 1;
X}
SHAR_EOF
fi # end of overwriting check
# End of shell archive
exit 0