gcc does not resolve extern global variables, with or without -c option
- by Moons
Hello everyone!
So i have this issue : i am declaring some extern global variables in my C program.
If I don't use the -c option for gcc, i get undefined references errors. But with that -c option, the linking is not done, which means that i don't have an executable generated.
So how do I solve this?
Here is my makefile. As I am not good with writing makefiles, I took one from another project then I changed a few things. So maybe I'm missing something here.
# Makefile calculPi
INCL = -I$(INCL_DIR)
DEFS = -D_DEBUG_
CXX_FLAGS =-g -c -lpthread -lm
CXX = gcc $(CXX_FLAGS) $(INCL) $(DEFS)
LINK_CXX = gcc
OBJ = approx.o producteur.o sequentialApproximation.o main.o
LINKOBJ = approx.o producteur.o sequentialApproximation.o main.o
BIN = calculPi.exe
RM = rm -fv
all: calculPi.exe
clean:
${RM} *\~ \#*\# $(OBJ)
clean_all: clean
${RM} $(BIN)
cleanall: clean
${RM} $(BIN)
$(BIN): $(OBJ)
$(CXX) $(LINKOBJ) -o "calculPi.exe"
main.o: main.c
$(CXX) main.c -o main.o $(CXX_FLAGS)
approx.o: approx.c approx.h
$(CXX) -c approx.c -o approx.o $(CXX_FLAGS);
producteur.o: producteur.c producteur.h
$(CXX) -c producteur.c -o producteur.o $(CXX_FLAGS);
sequentialApproximation.o : sequentialApproximation.c sequentialApproximation.h
$(CXX) -c sequentialApproximation.c -o sequentialApproximation.o $(CXX_FLAGS);
