Re: ld returned 1 exit status Error

From:

Alex Shulgin <alex.shulgin@gmail.com>

Newsgroups:

comp.lang.c++.moderated

Date:

Wed, 19 Mar 2008 12:45:55 CST

Message-ID:

<53a2e925-410f-4281-b060-3814c9a2f048@n75g2000hsh.googlegroups.com>

On Mar 19, 11:09 am, pai <grp...@yahoo.com> wrote:

Hi All,

       I am getting this error when I compile. Can any one tell wht
mistake i have done.

I am using 4 files

vector.cpp , vector.h , main.cpp Makefile

MakeFile
-------------
all:main.o

clean:
         rm main.o vector.o

main.o: main.cpp vector.h vector.o
         g++ -g -o main.o vector.o main.cpp

The above probably should be like this instead:

all: a.out

clean:
     rm main.o vector.o

a.out: main.o vector.o
     g++ -g -o a.out main.o vector.o

main.o: main.cpp
     g++ -g -c -o main.o main.cpp

vector.o: vector.cpp vector.h
g++ -g -c -o vector.o vector.cpp

[snip vector.h]

---------------
vector.cpp
--------------
#include "vector.h"

template <class T>
T* ptl::vec<T>::allocate(int size)
{
         T *tmp = (T*)malloc(size);
         cout << "allocate fn" << endl;
         return tmp;

}

This code actually must be in the vector.h if you want to use this
template outside of vector.cpp. Compiler needs the template
definition in order to do instantiation in your main.cpp. The main
file uses only vec's consturctor, but in turn, it uses `allocate' and
definition is not available.

--
Cheers,
Alex

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