Hi call,

"man gcc" stated that gcc is a c++ compiler.  However, I have the following
*VERY SIMPLE* code in c++ that doesn't compile in gcc.  It compiles fine in
VC++ 7.0.  I have no clue why.  TIA

Error message:
gcc test.cc
/tmp/ccMJrkgw.o(.text+0x18): In function `main':
: undefined reference to `Point::Point[in-charge]()'
/tmp/ccMJrkgw.o(.text+0x3f): In function `main':
: undefined reference to `Point::Point[in-charge](double, double)'
/tmp/ccMJrkgw.o(.eh_frame+0x11): undefined reference to
`__gxx_personality_v0'
collect2: ld returned 1 exit status



test.cc:
#include "Point.h"
#include <stdio.h>

int main()
{
Point a;
Point b(3, 4);
//printf("Distance is %f", a.getDistance(b));
return 0;
}

Point.h:
#ifndef Point_H
#define Point_H

class Point
{
private:
double m_x, m_y;

public:
Point();
Point(double x, double y);
double getDistance(Point p);
void setPoint(double x, double y);
double getX();
double getY();

};

#endif


Point.cc:
#include "Point.h"
#include <math.h>

Point::Point()
{
setPoint(0, 0);
}

Point::Point(double x, double y)
{
setPoint(x, y);
}

void Point::setPoint(double x, double y)
{
m_x = x;
m_y = y;
}
double Point::getX()
{
return m_x;
}
double Point::getY()
{
return m_y;
}

double Point::getDistance(Point p)
{
return pow(pow(p.getX() - m_x, 2) + pow(p.getY() - m_y, 2), 0.5);
}

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Tommy <tommy@nospam.com> writes:
quote:

> "man gcc" stated that gcc is a c++ compiler.  However, I have the
> following *VERY SIMPLE* code in c++ that doesn't compile in gcc.  It
> compiles fine in VC++ 7.0.  I have no clue why.  TIA


gcc and g++ are front ends for the GNU compilation system, which will
compile a number of different languages. If you want to compile C++
code, then invoke it as g++ rather than gcc.

Joe

[ Post a follow-up to this message ]

> gcc and g++ are front ends for the GNU compilation system, which will
quote:

> compile a number of different languages. If you want to compile C++
> code, then invoke it as g++ rather than gcc.


Using g++ did get rid of the 3rd error.  The first 2 errors remain.



joe@invalid.address wrote:
quote:

> Tommy <tommy@nospam.com> writes:
> 
>
> gcc and g++ are front ends for the GNU compilation system, which will
> compile a number of different languages. If you want to compile C++
> code, then invoke it as g++ rather than gcc.
>
> Joe

[ Post a follow-up to this message ]

Tommy <tommy@nospam.com> writes:
quote:

> "man gcc" stated that gcc is a c++ compiler.  However, I have the
> following *VERY SIMPLE* code in c++ that doesn't compile in gcc.  It
> compiles fine in VC++ 7.0.  I have no clue why.  TIA


gcc and g++ are front ends for the GNU compilation system, which will
compile a number of different languages. If you want to compile C++
code, then invoke it as g++ rather than gcc.

Joe

[ Post a follow-up to this message ]

> gcc and g++ are front ends for the GNU compilation system, which will
quote:

> compile a number of different languages. If you want to compile C++
> code, then invoke it as g++ rather than gcc.


Using g++ did get rid of the 3rd error.  The first 2 errors remain.



joe@invalid.address wrote:
quote:

> Tommy <tommy@nospam.com> writes:
> 
>
> gcc and g++ are front ends for the GNU compilation system, which will
> compile a number of different languages. If you want to compile C++
> code, then invoke it as g++ rather than gcc.
>
> Joe

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in comp.unix.programmer i read:
quote:
 
>
>Using g++ did get rid of the 3rd error.  The first 2 errors remain.


naturally.  where do you think gcc is going to obtain the implementation of
your Point object -- thin air?  you must tell it ...

g++ test.cc point.cc
or
g++ -c point.cc && g++ test.cc point.o
or
g++ -c point.cc && g++ -c test.cc && g++ test.o point.o

--
a signature

[ Post a follow-up to this message ]

in comp.unix.programmer i read:
quote:
 
>
>Using g++ did get rid of the 3rd error.  The first 2 errors remain.


naturally.  where do you think gcc is going to obtain the implementation of
your Point object -- thin air?  you must tell it ...

g++ test.cc point.cc
or
g++ -c point.cc && g++ test.cc point.o
or
g++ -c point.cc && g++ -c test.cc && g++ test.o point.o

--
a signature

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joe@invalid.address writes:
quote:
 
>
> gcc and g++ are front ends for the GNU compilation system, which will
> compile a number of different languages. If you want to compile C++
> code, then invoke it as g++ rather than gcc.


The only difference is that g++ links with libstdc++ by default,
whereas gcc doesn't.  Both will happily compile C++ source into object
files.

--
Måns Rullgård
mru@kth.se

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joe@invalid.address writes:
quote:
 
>
> gcc and g++ are front ends for the GNU compilation system, which will
> compile a number of different languages. If you want to compile C++
> code, then invoke it as g++ rather than gcc.


The only difference is that g++ links with libstdc++ by default,
whereas gcc doesn't.  Both will happily compile C++ source into object
files.

--
Måns Rullgård
mru@kth.se

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mru@kth.se (Måns Rullgård) writes:
quote:

> The only difference is that g++ links with libstdc++ by default,
> whereas gcc doesn't.


That is not the *only* difference.
quote:

> Both will happily compile C++ source into object files.


True. However, given a 'C' source, the object files produced by
gcc and g++ will be different (and the language accepted will be
different too).

Cheers,
--
In order to understand recursion you must first understand recursion.
Remove /-nsp/ for email.

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