creating two outputs with Makefile - c++

Question

I want to create a makefile which runs program in C++ once with "CXXFLAGS = -std=c++11 -g -O3 -DTEST -fopenmp" and one time with: "CXXFLAGS = -std=c++11 -g -O3 -fopenmp"
at the end outputs two different files like P1-Test and P1. how can I edit this file?
CXX = g++
CXXFLAGS = -std=c++11 -g -O3 -fopenmp
ifdef code_coverage
GCOV_FLAG := -DTEST
else
GCOV_FLAG :=
endif
all: P1
#echo The program has been compiled
# implicit rule: create x from x.cpp
.cpp:
$(CXX) $(CXXFLAGS) $? -o $#
$(CXX) $(CXXFLAGS) $(GCOV_FLAG) $? -o $#
.PHONY: clean
clean:
$(RM) -r P1 *.dSYM

Answer 1

My suggestion:
CXX = g++
CXXFLAGS = -std=c++11 -g -O3 -fopenmp
all: P1 P1-Test
#echo The program has been compiled
# implicit rule: create x from x.cpp
.cpp:
$(CXX) $(CXXFLAGS) $? -o $#
.PHONY: clean
clean:
$(RM) -r P1 *.dSYM
P1: main.o second.o
$(CXX) $(CXXFLAGS) $(LDFLAGS) -o "$#" $^
P1-Test: CXXFLAGS+=-DTEST
P1-Test: main.o second.o
$(CXX) $(CXXFLAGS) $(LDFLAGS) -o "$#" $^
With sample sources:
File main.cpp
extern void foo(); // should be in second.h or something
int main() { foo(); }
File second.cpp
#include <cstdio>
void foo() {
#ifdef TEST
puts("TEST defined");
#else
puts("TEST not defined");
#endif
}
Results in
$ make -B
g++ -std=c++11 -g -O3 -fopenmp -o "P1" main.cpp second.cpp
g++ -std=c++11 -g -O3 -fopenmp -DTEST -o "P1-Test" main.cpp second.cpp
The program has been compiled
And of course the outputs:
./P1; ./P1-Test
TEST not defined
TEST defined
Alternative
If your .o files are really .PRECIOUS, you might want to build separate copies. Here I split into release/main.o and test/main.o:
CXX = g++
CXXFLAGS = -std=c++11 -g -O3 -fopenmp
all: P1 P1-Test
#echo The program has been compiled
test/%.o: CXXFLAGS+=-DTEST
test/%.o: %.cpp
mkdir -pv $(#D)
$(CXX) $(CXXFLAGS) $? -c -o $#
release/%.o: %.cpp
mkdir -pv $(#D)
$(CXX) $(CXXFLAGS) $? -c -o $#
.PHONY: clean
clean:
$(RM) -rfv P1 P1-Test *.dSYM release/ test/
P1: release/main.o release/second.o
P1-Test: test/main.o test/second.o
P1 P1-Test:
$(CXX) $(CXXFLAGS) -o "$#" $^ $(LDFLAGS)
Which gives:
mkdir -pv release
g++ -std=c++11 -g -O3 -fopenmp main.cpp -c -o release/main.o
mkdir -pv release
g++ -std=c++11 -g -O3 -fopenmp second.cpp -c -o release/second.o
g++ -std=c++11 -g -O3 -fopenmp -o "P1" release/main.o release/second.o
mkdir -pv test
g++ -std=c++11 -g -O3 -fopenmp -DTEST main.cpp -c -o test/main.o
mkdir -pv test
g++ -std=c++11 -g -O3 -fopenmp -DTEST second.cpp -c -o test/second.o
g++ -std=c++11 -g -O3 -fopenmp -o "P1-Test" test/main.o test/second.o
echo The program has been compiled