使用Makefile創建兩個輸出-有解無憂

我想創建一個 makefile，它在 C 中運行程式一次，使用“CXXFLAGS = -std=c 11 -g -O3 -DTEST -fopenmp”，一次使用：“CXXFLAGS = -std=c 11 -g - O3 -fopenmp”最后輸出兩個不同的檔案，如 P1-Test 和 P1。我怎樣才能編輯這個檔案？

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

uj5u.com熱心網友回復：

我的建議：

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) $(LDFLAGS) -o "$@" $^

使用樣本來源：

檔案 main.cpp

 extern void foo(); // should be in second.h or something

 int main() { foo(); }

檔案 second.cpp

 #include <cstdio>

 void foo() {
 #ifdef TEST
     puts("TEST defined");
 #else
     puts("TEST not defined");
 #endif
 }

結果是

$ 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

當然還有輸出：

./P1; ./P1-Test 
TEST not defined
TEST defined

選擇

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

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標籤：C C 11 生成文件 openmp gnu-make

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