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To: hackers@freebsd.org
Subject: g++, STL and -frepo on FreeBSD-2.2-Beta
Date: Fri, 31 Jan 1997 13:08:01 -0500
From: Bakul Shah <bakul@torrentnet.com>
Sender: owner-hackers@freebsd.org
X-Loop: FreeBSD.org
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I'd appreciate some help from g++/STL experts on this list to solve
a problem with the above combination.  If this problem can be
solved, a copylefted Verilog behavioral simuluator just may show up
in the ports collection!  Assuming it works.

For the uninitiated, the -frepo patch from cygnus to the stock
gcc-2.7.2 is essential for a hassle free use of the standard
template library (STL).  As I understand it, somehow the linker
calls the compiler as many times as needed to instantiate specific
classes built from templates and used in the program being linked.

The trouble is, this doesn't work for me.  This is what I did:

tar -zxf gcc-2.7.2.tar.gz
cd gcc-2.7.2
gzcat ../gcc-2.7.2-2.7.2.1.diff.gz | patch -p1 -s
gzcat ../gcc-2.7.2-repo.gz | patch -s
./configure
make bootstrap
make install	# this step as root

rm /usr/local/lib/gcc-lib/i386-unknown-freebsd2.2/2.7.2.1/include/stdarg.h
# gcc installed stdarg.h clashes with the standard freebsd includes.

Next I built and installed libg++-2.7.1 because that is what the
program I am trying to compile wants.

Then I tried the following test program:

cat >x.cc <<EOF
#include <stl.h>                // include everything for simplicity.
#include <iostream.h>
#include <stdlib.h>

int main(int, char*[]) {
    list<int> list1;
    for(int i = 0; i < 10; ++i) {
        list1.push_back(rand());
    }
    return 0;
}
EOF

g++ -frepo -c x.cc
g++ -o x x.o

The last step above should call the compiler to instantiate the
list<int> class and everything should just work.  No such luck.  I
get:

x.o: Undefined symbol `list<int>::list(void)' referenced from text segment
x.o: Undefined symbol `list<int>::push_back(int const &)' referenced from text segment
x.o: Undefined symbol `list<int>::~list(void)' referenced from text segment
collect2: ld returned 1 exit status

g++ -v -o x x.o reveals

/usr/local/lib/gcc-lib/i386-unknown-freebsd2.2/2.7.2.1/ld -e start -dc -dp -o x /usr/lib/crt0.o -L/usr/local/lib/gcc-lib/i386-unknown-freebsd2.2/2.7.2.1 -L/usr/local/lib x.o -lg++ -lstdc++ -lm -lgcc -lc -lgcc

Which seems right to me.

Any ideas for figuring this out will be gratefully accepted.

-- bakul