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copied!<h2>Solution 1</h2> <p>You can't pass <code>-c</code> in your linking phase, as that will tell the compiler to skip linking.</p> <p>Your problem is</p> <pre><code>$(BIN): $(OBJ) $(CXX) $(LINKOBJ) -o "calculPi.exe" </code></pre> <p>with</p> <pre><code>CXX_FLAGS =-g -c -lpthread -lm </code></pre> <p>where <code>$(CXX)</code> expands to <code>gcc -g -c -lpthread -lm ...</code></p> <p>get rid of the <code>-c</code> there.</p> <p>Only pass -c when compiling from source to object modules.</p> <h2>Solution 2</h2> <p>Re the second problem, you aren't actually defining the variables anywhere. In your <code>.c</code> file you need the lines:</p> <pre><code>Coord* production; int indice_prod; int indice_cons; </code></pre> <p>(Assuming you really want global variables). This will fix the unresolved external error. You can't write to them until they've been allocated!</p> <h2>Notes</h2> <p>Also note that you can specify how to build object files from source in one rule:</p> <pre><code>.c.o: $(CC) $(CFLAGS) -c $< </code></pre> <p>and specify the dependencies without rules:</p> <pre><code>main.o: main.c approx.o: approx.c approx.h producteur.o: producteur.c producteur.h sequentialApproximation.o : sequentialApproximation.c sequentialApproximation.h </code></pre> <p>etc.</p> <h2>Other notes.</h2> <p>Also, as general rule of thumb, <code>CXX</code> should only contain the compiler name, no flags. Those should go in <code>CXX_FLAGS</code>. And why are you calling it <code>CXX</code> not <code>CC</code>? Use <code>g++</code> if you want a C++ compiler, or use <code>CC</code>. Since you have <code>.c</code> files, I'll assume C. So in your case, you should change:</p> <pre><code>CXX_FLAGS =-g -c -lpthread -lm CXX = gcc $(CXX_FLAGS) $(INCL) $(DEFS) </code></pre> <p>to</p> <pre><code>CC = gcc CFLAGS = -g -lpthread -lm $(INCL) $(DEFS) # also removed -c </code></pre> <p>And you don't need a separate <code>LINK_CXX</code>.</p> <h2>Sample Makefile</h2> <p>So a minimal Makefile should look like:</p> <pre><code># Makefile CC = gcc # compiler/linker frontend INCL = -I$(INCL_DIR) # includes DEFS = -D_DEBUG_ # defines CFLAGS = -g $(INCL) $(DEFS) # compiler flags LFLAGS = -lpthread -lm -g # linker flags OBJ = approx.o producteur.o sequentialApproximation.o main.o BIN = calculPi.exe all: $(BIN) $(BIN): $(OBJ) $(CC) $(LFLAGS) -o$@ $^ main.o: main.c approx.o: approx.c approx.h producteur.o: producteur.c producteur.h sequentialApproximation.o : sequentialApproximation.c sequentialApproximation.h .c.o: $(CC) $(CFLAGS) -c $< # clean and other stuff. </code></pre>

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