Makefile of simple analysis

[eddymaoui]

Hi evryone
I try to run my analysis with a simple makefile but until now i can’t run it correctly .
you wil find below the files
could you please help me

CXX=$(shell root-config --cxx)
CXXFLAGS=$(shell root-config --cflags)
LDFLAGS=$(shell root-config --ldflags)
LDLIBS= $(shell root-config --glibs)

LIBS=analyse2.so
SOURCES=analyse2.cc 
OBJECTS=$(SOURCES:.cc=.o)
EXECUTABLE=t1

$(EXECUTABLE): $(OBJECTS)
	$(CXX) $(LDFLAGS) -o $@ $^ $(LDLIBS)

$(OBJECTS) : $(SOURCES) analyse2.h
        $(CXX) $(CXXFLAGS) -W -Wall -c -fpic $< -o $@ 

clean:
	rm ./~ ./.o

and this is the error a got:

c++ -pthread -std=c++11 -m64 -I/home/ahmed/myprograms/root/include -W -Wall -c -fpic analyse2.cc -o analyse2.o 
In file included from analyse2.cc:4:0:
analyse2.h:265:30: warning: unused parameter ‘entry’ [-Wunused-parameter]
 Int_t analyse2::Cut(Long64_t entry)
                              ^
c++ -m64 -o t1 analyse2.o -L/home/ahmed/myprograms/root/lib -lGui -lCore -lImt -lRIO -lNet -lHist -lGraf -lGraf3d -lGpad -lROOTVecOps -lTree -lTreePlayer -lRint -lPostscript -lMatrix -lPhysics -lMathCore -lThread -lMultiProc -lROOTDataFrame -pthread -lm -ldl -rdynamic
/usr/lib/gcc/x86_64-linux-gnu/5/../../../x86_64-linux-gnu/crt1.o: In function `_start':
(.text+0x20): undefined reference to `main'
collect2: error: ld returned 1 exit status
Makefile:28: recipe for target 't1' failed
make: *** [t1] Error 1

analyse2.cc (1.5 KB) analyse2.h (7.9 KB)
thanks

[eguiraud]

Hi,
as the error says, there is no main function in analyse2.cc. The compiler does not know how to create an executable from just analyse2.{cc,h}, you need a main function somewhere, as an entry point for the executable.

Hope this helps!
Enrico