Mistake With CPP File

Mistake With CPP File

[SoloCDM]

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Recently I tried to compile fig01_02.cpp with Kernel 2.2.20 on Linux
Mandrake 8.0.  I used "gcc fig01_02.cpp" and received the following
errors:

<user_account>/tmp/ccmeDWKS.o: In function `main':
<user_account>/tmp/ccmeDWKS.o(.text+0xf): undefined reference to
`cout'
<user_account>/tmp/ccmeDWKS.o(.text+0x14): undefined reference to
`ostream::operator<<(char const *)'collect2: ld returned 1 exit status

Why didn't it work?

I attached the file in question.

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// Fig. 1.2: fig01_02.cpp
// A first program in C++
#include <iostream.h>

int main()
{
	cout << "Welcome to C++!\n";

	return 0;   // indicate that program ended successfully
}

Re: Mistake With CPP File

[Robert Schiele]

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On Wed, Jul 31, 2002 at 05:04:04AM -0600, SoloCDM wrote:
> Recently I tried to compile fig01_02.cpp with Kernel 2.2.20 on Linux
> Mandrake 8.0.  I used "gcc fig01_02.cpp" and received the following
> errors:
> 
> <user_account>/tmp/ccmeDWKS.o: In function `main':
> <user_account>/tmp/ccmeDWKS.o(.text+0xf): undefined reference to
> `cout'
> <user_account>/tmp/ccmeDWKS.o(.text+0x14): undefined reference to
> `ostream::operator<<(char const *)'collect2: ld returned 1 exit status
> 
> Why didn't it work?

cout is in libstdc++. So either you have to call "g++ fig01_02.cpp" or
"gcc -lstdc++ fig01_02.cpp".

Robert

-- 
Robert Schiele			Tel.: +49-621-181-2517
Dipl.-Wirtsch.informatiker	mailto:rschiele@uni-mannheim.de

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Re: Mistake With CPP File

[SoloCDM]

Robert Schiele stated the following:
> 
> On Wed, Jul 31, 2002 at 05:04:04AM -0600, SoloCDM wrote:
> > Recently I tried to compile fig01_02.cpp with Kernel 2.2.20 on Linux
> > Mandrake 8.0.  I used "gcc fig01_02.cpp" and received the following
> > errors:
> >
> > <user_account>/tmp/ccmeDWKS.o: In function `main':
> > <user_account>/tmp/ccmeDWKS.o(.text+0xf): undefined reference to
> > `cout'
> > <user_account>/tmp/ccmeDWKS.o(.text+0x14): undefined reference to
> > `ostream::operator<<(char const *)'collect2: ld returned 1 exit status
> >
> > Why didn't it work?
> 
> cout is in libstdc++. So either you have to call "g++ fig01_02.cpp" or
> "gcc -lstdc++ fig01_02.cpp".

It worked -- Thanks!

I couldn't help but notice how g++ linked all the way back to
colorgcc.  Although, colorgcc doesn't react like g++.  Colorgcc won't
create a.out.

What is gcc used for?  I noticed it seems to have some of the same
files or libraries as g++.

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Re: Mistake With CPP File

[Robert Schiele]

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On Thu, Aug 01, 2002 at 02:38:32AM -0600, SoloCDM wrote:
> Robert Schiele stated the following:
> > cout is in libstdc++. So either you have to call "g++ fig01_02.cpp" or
> > "gcc -lstdc++ fig01_02.cpp".
> 
> It worked -- Thanks!
> 
> I couldn't help but notice how g++ linked all the way back to
> colorgcc.  Although, colorgcc doesn't react like g++.  Colorgcc won't
> create a.out.

Sorry, but I cannot see what you wanted to tell us with this
paragraph.

> What is gcc used for?  I noticed it seems to have some of the same
> files or libraries as g++.

gcc and g++ are the same, but gcc uses C as it's standard language,
where g++ uses C++ as standard language and links standard C++
libraries without the need to specify them explicitly.

Robert

-- 
Robert Schiele			Tel.: +49-621-181-2517
Dipl.-Wirtsch.informatiker	mailto:rschiele@uni-mannheim.de

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Re: Mistake With CPP File

[SoloCDM]

Robert Schiele stated the following:
> 
> On Thu, Aug 01, 2002 at 02:38:32AM -0600, SoloCDM wrote:
>
> > Robert Schiele stated the following:
> >
> > > cout is in libstdc++. So either you have to call "g++ fig01_02.cpp" or
> > > "gcc -lstdc++ fig01_02.cpp".
> >
> > It worked -- Thanks!
> >
> > I couldn't help but notice how g++ linked all the way back to
> > colorgcc.  Although, colorgcc doesn't react like g++.  Colorgcc won't
> > create a.out.
> 
> Sorry, but I cannot see what you wanted to tell us with this
> paragraph.

It starts the linking (ln command) with /usr/bin/g++ -->
/etc/alternatives/g++ --> /usr/bin/colorg++ --> /usr/bin/colorgcc. 
G++ is acting as a link.  If executed in the same manner as g++ to
create an a.out file, without options, colorgcc doesn't execute like
g++.

> > What is gcc used for?  I noticed it seems to have some of the same
> > files or libraries as g++.
> 
> gcc and g++ are the same, but gcc uses C as it's standard language,
> where g++ uses C++ as standard language and links standard C++
> libraries without the need to specify them explicitly.

Is the documentation on my system to know how to use different things
like "-lstdc++" with g++?  What would the files be?  I didn't find
anything in the man page.

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Signed,
SoloCDM

Re: Mistake With CPP File

[Robert Schiele]

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On Fri, Aug 02, 2002 at 06:47:41AM -0600, SoloCDM wrote:
> It starts the linking (ln command) with /usr/bin/g++ -->
> /etc/alternatives/g++ --> /usr/bin/colorg++ --> /usr/bin/colorgcc. 
> G++ is acting as a link.  If executed in the same manner as g++ to
> create an a.out file, without options, colorgcc doesn't execute like
> g++.

What do you have in ~/.colorgccrc?

> Is the documentation on my system to know how to use different things
> like "-lstdc++" with g++?  What would the files be?  I didn't find
> anything in the man page.

Try "info gcc".

Robert

-- 
Robert Schiele			Tel.: +49-621-181-2517
Dipl.-Wirtsch.informatiker	mailto:rschiele@uni-mannheim.de

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Re: Mistake With CPP File

[SoloCDM]

Robert Schiele stated the following:
> 
> On Fri, Aug 02, 2002 at 06:47:41AM -0600, SoloCDM wrote:
> 
> > It starts the linking (ln command) with /usr/bin/g++ -->
> > /etc/alternatives/g++ --> /usr/bin/colorg++ --> /usr/bin/colorgcc.
> > G++ is acting as a link.  If executed in the same manner as g++ to
> > create an a.out file, without options, colorgcc doesn't execute like
> > g++.
> 
> What do you have in ~/.colorgccrc?

No such file exists.  Everything for g++ and gcc is exactly as it was
installed.

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*********************************************************************
Signed,
SoloCDM

Re: Mistake With CPP File

[Robert Schiele]

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On Fri, Aug 02, 2002 at 12:18:49PM -0600, SoloCDM wrote:
> Robert Schiele stated the following:
> > 
> > On Fri, Aug 02, 2002 at 06:47:41AM -0600, SoloCDM wrote:
> > 
> > > It starts the linking (ln command) with /usr/bin/g++ -->
> > > /etc/alternatives/g++ --> /usr/bin/colorg++ --> /usr/bin/colorgcc.
> > > G++ is acting as a link.  If executed in the same manner as g++ to
> > > create an a.out file, without options, colorgcc doesn't execute like
> > > g++.
> > 
> > What do you have in ~/.colorgccrc?
> 
> No such file exists.  Everything for g++ and gcc is exactly as it was
> installed.

Then your installation of colorgcc is braindead, as you have an
infinite loop, because colorgcc runs /usr/bin/g++ by default, which is
itself in your case.  You need to specify the path to your real g++ in
the config file.

Robert

-- 
Robert Schiele			Tel.: +49-621-181-2517
Dipl.-Wirtsch.informatiker	mailto:rschiele@uni-mannheim.de

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