From mboxrd@z Thu Jan  1 00:00:00 1970
From: Fredrik Öhrström <d92-foh@nada.kth.se>
To: "Martin v. Loewis" <martin@mira.isdn.cs.tu-berlin.de>
Cc: gcc@gcc.gnu.org
Subject: Almost got glibc working with no-vtable-thunks, but ....
Date: Thu, 30 Sep 1999 18:02:00 -0000
Message-ID: <Pine.GSO.3.95.990915174552.7566A-100000@mumrik.nada.kth.se>
References: <199909142102.XAA00709@mira.isdn.cs.tu-berlin.de>
X-SW-Source: 1999-09n/msg00627.html
Message-ID: <19990930180200.3PD6jvAZk5cc7vG4Ewq-38pOpENQ-CrjLNxorWZFYkI@z>

> This, in turn, could result from an incorrect contents of _G_config.h,
> which explains the C++ vtable mechanism to C applications. You'll

Found it. Everything seems to build correctly now. The generated 
files contains _vt. prefixes for the virtual tables instead of _vt_

I examined what the glibc "make check" command did to compile
testprograms with the new library. With that information I managed
to compile a single HelloWorld C program and link with the new
library! :-)

But when I try the following C++ program I get several link 
errors of this kind:
/usr/local/gcc/lib/libstdc++.a.2.10.0(iostream.o): In function
`_IO_ostream_with assign type_info function':
/home/foh/Code/gccobjdir/i686-pc-linux-gnu/libio/../../../gcc-2.95.1/libio/iostr
eam.h(.gnu.linkonce.t._._8iostream+0xc9): undefined reference to
`__builtin_vec_delete'

The program looks like this:

#include<stdio.h>
#include<iostream.h>

struct Alfa
{
        virtual int a() = 0;
};


struct Beta : public Alfa
{
        int a () 
        {
                return 47;
        }
};


int main()
{
        printf ("Hello World!\n");        
        cout << "Hello World!" << endl;
        Beta b;
        
        return b.a();        
}

And the makefile looks like this:

all: compile link 

compile: test.cc
	g++ test.cc -c -g 
-DNLSPATH='"/usr/local/glibc/share/locale/%L/%N:/usr/local/glibc/share/locale/%L/LC_MESSAGES/%N:/usr/local/glibc/share/locale/%l/%N:/usr/local/glibc/share/locale/%l/LC_MESSAGES/%N:"'
-DHAVE_CONFIG_H -D_LIBC_REENTRANT -o test.o

link: test.o
	gcc -nostdlib -nostartfiles -o test
-Wl,-dynamic-linker=/usr/local/glibc/lib/ld-linux.so.2
/usr/local/glibc/lib/crt1.o /usr/local/glibc/lib/crti.o `gcc
--print-file-name=crtbegin.o` test.o
-Wl,-rpath-link=/usr/local/glibc/lib /usr/local/glibc/lib/libc.so.6
/usr/local/glibc/lib/libc_nonshared.a -lgcc `gcc
--print-file-name=crtend.o` /usr/local/glibc/lib/crtn.o
/usr/local/gcc/lib/libstdc++.a.2.10.0 

(Sorry for the linebreaks...)

What do I link in to find these rather important methods?
I thought that earlier you had to explicitly link in -lg++ 
but now I can't find any library with that name.

Thanks!
Fredrik Ohrstrom