undefined reference

undefined reference

[Xiaomao Xiao]

Hi there:

I asked the sample question before.  But I'm afraid that I didn't state the
problem clearly.  I include the code which produced the 'undefined reference'
problem on my Linux box.

=============================================================================
The program is as follows:

#include <iostream>
#include <iomanip>

template <class T>
class MyTest
{
private:
  T data_;

public:
  MyTest(T data = 0)
  {
    data_ = data;
  }

  friend ostream & operator <<(ostream & out, const MyTest<T> & test);
};

template <class T>
ostream & operator <<(ostream & out, const MyTest<T> & test)
{
  out << setw(12);
  out << test.data_ << endl;

  return (out);
}

template class MyTest<float>;
template ostream & operator <<(ostream &, const MyTest<float> &);

main()
{
  MyTest<float> test;

  cout << test;
}

=============================================================================
The error message is:
/tmp/cca005831.o: In function `operator<<(ostream &, MyTest<float> const &)':
/tmp/cca005831.o(.text+0x61): undefined reference to `operator<<(ostream &, smanip<int> const &)'

=============================================================================
The compile command is:
gcc -fguiding-decls -fno-implicit-templates junk.cpp -L/usr/local/lib -lstdc++ -o junk

Could anybody tell me what I should do to make this piece of code work?  Thanks
in advance.

-- 

Xiaomao

=================================================================
Xiaomao (Mark) Xiao                  E-Mail: xiao@cmold.com
C-MOLD                                  TEL: (607) 257-4949 x 699
31 Dutch Mill Road                      FAX: (607) 257-6355
Ithaca, NY 14850                        URL: http://www.cmold.com
=================================================================

Re: undefined reference

[Martin von Loewis]

> =============================================================================
> The error message is:
> /tmp/cca005831.o: In function `operator<<(ostream &, MyTest<float> const &)':
> /tmp/cca005831.o(.text+0x61): undefined reference to `operator<<(ostream &, smanip<int> const &)'
> 
> =============================================================================
> The compile command is:
> gcc -fguiding-decls -fno-implicit-templates junk.cpp -L/usr/local/lib -lstdc++ -o junk
> 
> Could anybody tell me what I should do to make this piece of code
> work?  Thanks in advance.

Omit both -fguiding-decls and -fno-implicit-templates when
compiling. You should not need them.

If you absolutely want to use explicit instantiation, please read the
g++ FAQ for details.

Regards,
Martin

Re: undefined reference

[Carlo Wood]

| > =============================================================================
| > The error message is:
| > /tmp/cca005831.o: In function `operator<<(ostream &, MyTest<float> const &)':
| > /tmp/cca005831.o(.text+0x61): undefined reference to `operator<<(ostream &, smanip<int> const &)'
| > 
| > =============================================================================
| > The compile command is:
| > gcc -fguiding-decls -fno-implicit-templates junk.cpp -L/usr/local/lib -lstdc++ -o junk
| > 
| > Could anybody tell me what I should do to make this piece of code
| > work?  Thanks in advance.
| 
| Omit both -fguiding-decls and -fno-implicit-templates when
| compiling. You should not need them.
| 
| If you absolutely want to use explicit instantiation, please read the
| g++ FAQ for details.
| 
| Regards,
| Martin

This has nothing to do with -fno-implicit-templates.

Note that -fno-implicit-templates has been broken since gcc-2.8.x.
I used it with gcc-2.7, but with gcc-2.8 and egcs it is impossible to use.

I am sorry to realize that I am too much de-motivated to write a
bug report due to the fact that my last bug report / request for hints
( http://www.cygnus.com/ml/egcs-patches/1998-Jul/0330.html ) is completely
ignored :( by the C++ guru's on this list.  So much for "open development".

-- 
 Carlo Wood  <carlo@runaway.xs4all.nl>

Re: undefined reference

[Mike Stump]

> From: Carlo Wood <carlo@runaway.xs4all.nl>
> To: martin@mira.isdn.cs.tu-berlin.de (Martin von Loewis)
> Date: Tue, 21 Jul 1998 14:43:27 +0200 (CEST)

> I am sorry to realize that I am too much de-motivated to write a bug
> report due to the fact that my last bug report / request for hints
> ( http://www.cygnus.com/ml/egcs-patches/1998-Jul/0330.html ) is
> completely ignored :( by the C++ guru's on this list.  So much for
> "open development".

I think it should be added to the g++.law directory...  Also, is it
missing the fact that we expect it to fail?  If it ever worked (in 2.7
for example) then it is ok as is.  If it never worked, my preference
is for it to be marked as expected to fail.

Law and or Jason will have to comment on why it isn't in...  Be kind
to them, sometimes the roles of maintainer is a hard thankless job.
In this case, we can just ask that it be added again.

undefined reference

[Ulrich Czekalla]

Hi Everyone,

I wrote a class wrapper around the linux socket calls and compiled them
as a shared library;

egcs -shared -fpic -o libsl.so socket.cc

When I link it with an application which uses it I get

undefined reference to 'CSocket::Listen(int (*)(void *))'

CSocket::Listen is one of the member functions I wrote. If I don't use
this function, everything works fine. I know this function is defined.
Are there flags to the compiler or export tags which I'm missing?


Any help would be appreciated. Thanks

-Ulrich 
-- 
/*****************************************************
 * Ulrich Czekalla                                   *
 * University of Toronto                             *
 * Software Engineering       Bachelor of Commerce   *
 * g5ulczek@cdf.utoronto.ca                          *
 *****************************************************/

Undefined reference

[SUGIMOTO, Manabu]

Dear Sir,

I am trying to compile a software using gcc and g77, but, unfortunately, the
compilation fails with the following error messages. My system is
DellPrecision530(Xeon 2GHz) with RedHat7.1.  I have installed gcc-2.96 and
the accompanied g77.

> util.so: undefined reference to `wait_'
> util.so: undefined reference to `gsr48_'
> util.so: undefined reference to `fork_'
> util.so: undefined reference to `drand48_'
> collect2: ld returned 1 exit status
>

Could you kindly suggest me about how to fix the problem ? Thank you.


Manabu Sugimoto
Department of Applied Chemistry and Biochemistry
Faculty of Engineering
Kumamoto University
Kumamoto 860-8555, Japan
TEL: +81-96-342-3650
FAX: +81-96-342-3679

Re: Undefined reference

[Tim Prince]

gcc-2.96 is a proprietary redhat version.  Your errors appear to indicate
that you have not installed all required libraries.   On both counts, your
question falls outside the purview of any gcc mailing list.
----- Original Message -----
From: "SUGIMOTO, Manabu" <sugimoto@gpo.kumamoto-u.ac.jp>
To: <gcc@gnu.org>
Cc: <sugimoto@gpo.kumamoto-u.ac.jp>
Sent: Wednesday, November 21, 2001 12:24 AM
Subject: Undefined reference


> Dear Sir,
>
> I am trying to compile a software using gcc and g77, but, unfortunately,
the
> compilation fails with the following error messages. My system is
> DellPrecision530(Xeon 2GHz) with RedHat7.1.  I have installed gcc-2.96 and
> the accompanied g77.
>
> > util.so: undefined reference to `wait_'
> > util.so: undefined reference to `gsr48_'
> > util.so: undefined reference to `fork_'
> > util.so: undefined reference to `drand48_'
> > collect2: ld returned 1 exit status
> >
>
> Could you kindly suggest me about how to fix the problem ? Thank you.
>
>
> Manabu Sugimoto
> Department of Applied Chemistry and Biochemistry
> Faculty of Engineering
> Kumamoto University
> Kumamoto 860-8555, Japan
> TEL: +81-96-342-3650
> FAX: +81-96-342-3679
>
>
>
>

Re: Undefined reference

[Alexandre Oliva]

On Nov 21, 2001, "Tim Prince" <tprince@computer.org> wrote:

> gcc-2.96 is a proprietary redhat version.

The fact that it is not one version of GCC released by the Free
Software Foundation doesn't make it proprietary.  It's just as Free
Software as any other version of GCC ever released.

Oh, and it's Red Hat (note the blank), not redhat.

-- 
Alexandre Oliva   Enjoy Guarana', see http://www.ic.unicamp.br/~oliva/
Red Hat GCC Developer                  aoliva@{cygnus.com, redhat.com}
CS PhD student at IC-Unicamp        oliva@{lsd.ic.unicamp.br, gnu.org}
Free Software Evangelist    *Please* write to mailing lists, not to me

undefined reference

[gcc]

hello,

I have troubles with my GCC 2.95 compiler, to compile standard math functions such as sin and tan.

Do you know how to solve this?

My greetings,

Roelof

Re: undefined reference

[Paolo Carlini]

gcc@ras.tmfweb.nl wrote:

>hello,
>
>I have troubles with my GCC 2.95 compiler, to compile standard math functions such as sin and tan.
>
>Do you know how to solve this?
>
Please address preferentially this kind of questions to gcc-help@gcc.gnu.org
Are you including in your command line -lm ?

P.