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POcompiling/linking template class as static library
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2012-11-20T16:10:34.983
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2012-11-20T16:44:51.180
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I'm working on a program right now and to test template classes (which I will need) I wrote a small (and buggy, chances are 2 or 3 logic bugs in it, my goal is to get it to compile) stack class. What I want to do is to compile it to a static library (.a) then link it with the main program. The error is: <pre><code>main.cpp:(.text+0x1c): undefined reference to `Stack<int>::Stack()' main.cpp:(.text+0x31): undefined reference to `Stack<int>::push(int)' main.cpp:(.text+0x42): undefined reference to `Stack<int>::push(int)' main.cpp:(.text+0x4e): undefined reference to `Stack<int>::pop()' main.cpp:(.text+0x5d): undefined reference to `Stack<int>::pop()' collect2: error: ld returned 1 exit status </code></pre> This is the header file: <pre><code>/* stack.h */ #ifndef _STACK_INCLUDED_ #define _STACK_INCLUDED_ template<typename T> struct Node { T* node; Node<T>* next; }; template<typename T> class Stack { private: Node<T>* bottom; public: Stack(); Stack(T first); Stack(T* arr, int amount); void push(T push); T* pop(); }; /* I added the following prototypes in an attempt to correct the error, did not work*/ template<typename T> Stack<T>::Stack(); template<typename T> Stack<T>::Stack(T first); template<typename T> Stack<T>::Stack(T* arr, int amount); template<typename T> void Stack<T>::push(T push); template<typename T> T* Stack<T>::pop(); #endif </code></pre> Here is the implementation file: <pre><code>/* stack.cpp */ #include "../heads/stack.h" #define null (void*)0 template<typename T> Stack<T>::Stack() { bottom = null; } template<typename T> Stack<T>::Stack(T first) { push(first); } template<typename T> Stack<T>::Stack(T* arr, int amount) { int i; for(i=0;i<amount; i++) { push(arr[i]); } } template<typename T> void Stack<T>::push(T push) { Node<T>* tmp = new Node<T>(); tmp->node = push; tmp->next = null; Node<T>* node = bottom; while(node->next != null) { node = node->next; } node->next = tmp; } template<typename T> T* Stack<T>::pop() { int i=0; Node<T>* node = bottom; while(node->next != null) { i++; node = node->next; } node = bottom; for(;i>1;i++) { node = node->next; } Node<T>* res = node->next; node->next = null; return res->node; } </code></pre> You might have noticed the header file is included: "../heads/stack.h", this is because the structure looks like so: <pre><code>- root -- CLASSNAME --- implementation of CLASSNAME -- heads --- all the headers -- obj --- object files (compiled) --bin ---final output </code></pre> . The makefile looks like so: <pre><code>CC=g++ CFLAGS=-c -fpermissive -Wall LFLAGS=-llua OBJ=obj BIN=bin HS=heads all: $(OBJ)/bind.a $(OBJ)/stack.a $(OBJ)/main.o $(CC) $(LFLAGS) -o $(BIN)/main $(OBJ)/main.o $(OBJ)/bind.a $(OBJ)/stack.a $(OBJ)/bind.o: binds/bind.cpp $(HS)/bind.h $(CC) $(CFLAGS) binds/bind.cpp -o $(OBJ)/bind.o $(OBJ)/bind.a: $(OBJ)/bind.o ar -cvq $(OBJ)/bind.a $(OBJ)/bind.o $(OBJ)/main.o: $(CC) $(CFLAGS) main/main.cpp -o $(OBJ)/main.o $(OBJ)/stack.o: $(HS)/stack.h stack/stack.cpp $(CC) $(CFLAGS) stack/stack.cpp -o $(OBJ)/stack.o $(OBJ)/stack.a: $(OBJ)/stack.o ar -cvq $(OBJ)/stack.a $(OBJ)/stack.o clean: touch $(OBJ)/dummy rm $(OBJ)/* </code></pre> Compiler: g++ 4.7.2 (gcc-multilib) OS: Arch Linux (x86_64) (kernel 3.6.6-1) You can get the whole file <a href="http://ge.tt/1JA070S/v/0" rel="nofollow">here</a> (I'm doing multiple test, so don't mind the -llua flag and other files, you can change the Makefile if needed, I just want to figure this out). After some research and testing, I noticed that the symbols aren't being exported, (<code>nm obj/stack.o</code> shows nothing, while <code>nm obj/bind.o</code> does. same thing for (.a)). However I could not find any reference to what to do in this case.
Tags
<gcc><reference><g++><static-libraries>
Title
compiling/linking template class as static library
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1. PO
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 PTAnswer
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1. PTQuestion
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1. PL
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 LTLinked
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1. PO
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