undefined reference - each object file compiles, but link fails

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static variable link error
What is an undefined reference/unresolved external symbol error and how do I fix it?

Sorry for adding yet another "undefined reference to" makefile problem post, but I couldn't find a solution even after extensive searching...

Each object files compiles completely fine. During the final linking stage, the linker (or make?) complains about "undefined reference to" various functions and static class variables...

Makefile:

CXX = mpic++
CXXFLAGS = -g   -O3   -fopenmp   -std=c++0x     

SOME_DIR=/some/directory

LDFLAGS=   -I$(SOME_DIR) -L$(SOME_DIR)  -Wl,-rpath,$(SOME_DIR) -lsomelib   \
             # ...more libraries...     \
           -Wl,--verbose    -ldl


SOURCES=$(wildcard ./*.cpp)
HEADERS=$(wildcard ./*.h)

OBJECTS=$(SOURCES:.cpp=.o)


all :   $(OBJECTS)  
    $(CXX) $(CXXFLAGS) $(OBJECTS)   $(LDFLAGS)      \
    -o my_prog
    @echo "my_prof executable successfully created."

%.o  :  %.cpp   $(HEADERS)
    $(CXX) $(CXXFLAGS) -o $@  -c    $(LDFLAGS)   $<

All "include guards" are in place for each .h file. Each object file compiles without issue. Examining the extra output provided form the linker via --verbose, I verify that all libraries linked to are found by the linker, and that all object files are successfully opened by the linker.

Then, at the last stage, I get a slew of "undefined references" to functions in other source/object files:

./some_object.o: In function `some_class::some_func(int &arg)':
./some_class.cpp:78: undefined reference to 'another_function_defined_in_another_header_file'

And also undefined references to (public) static member variables :

./main.cpp:473: undefined reference to `some_class::some_static_member_variable_A'
./main.cpp:491: undefined reference to `some_class::some_static_member_variable_B'
./main.cpp:500: undefined reference to `some_class::some_static_member_variable_C'
./main.cpp:511: undefined reference to `some_class::some_static_member_variable_D'

post your source code, seems more than a linker error to me OR a short source code that summerizes it. — Aniket Inge, Jan 21 '13 at 17:54
@Aniket but each individual object file compiles correctly... so doesn't that rule out the source code? — cmo, Jan 21 '13 at 17:55
no @MatthewParks it doesn't. Static variables are local to the file.. can't be accessed from outside the file — Aniket Inge, Jan 21 '13 at 17:56
@Aniket wrong kind of `static`, this `static` means the `static` member of a class. — Seth Carnegie, Jan 21 '13 at 17:58

undefined reference - each object file compiles, but link fails

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