g ++链接问题：在函数`

g ++链接问题：在函数`_start'中：（。text + 0x20）：对'main'的未定义引用(g++ link problems: In function `_start': (.text+0x20): undefined reference to `main')

我得到一个未定义的主要错误引用 - 即使我已经定义了main，和（AFAICT），我已正确链接它。这是我的代码和我使用的命令：

// ################################################ //proj1.h #ifndef __SCRATCH_PROJ1_H #define __SCRATCH_PROJ1_H int addOne(int i); #endif /*__SCRATCH_PROJ1_H */ // ################################################ //proj1.cpp #include "proj1.h" int addOne(int i){ return i+1; } // ################################################ //proj1_unittest.cpp #include "proj1.h" #include "gtest/gtest.h" // Test Function TEST(addOneTest, Positive) { EXPECT_EQ(1,addOne(0)); EXPECT_EQ(2,addOne(1)); EXPECT_EQ(40320, addOne(40319)); } TEST(addOneTest, Negative) { EXPECT_FALSE(addOneTest(-1)); } GTEST_API_ int main(int argc, char **argv) { testing::InitGoogleTest(&argc, argv); return RUN_ALL_TESTS(); }

这是控制台输出：

$ g++ -isystem -pthread -c ${SOURCE_DIR}/proj1.c -o ${SOURCE_DIR}/proj1.o $ g++ -o ${SOURCE_DIR}/mytest ${SOURCE_DIR}/*.o -L${GTEST_DIR} libgtest.a /usr/lib/gcc/x86_64-linux-gnu/4.6/../../../x86_64-linux-gnu/crt1.o: In function `_start': (.text+0x20): undefined reference to `main' collect2: ld returned 1 exit status

为什么链接器找不到main()函数？

I am getting an undefined reference to main error - even though I have defined main, and (AFAICT), I have linked it correctly. Here is my code and the commands I used:

// ################################################ //proj1.h #ifndef __SCRATCH_PROJ1_H #define __SCRATCH_PROJ1_H int addOne(int i); #endif /*__SCRATCH_PROJ1_H */ // ################################################ //proj1.cpp #include "proj1.h" int addOne(int i){ return i+1; } // ################################################ //proj1_unittest.cpp #include "proj1.h" #include "gtest/gtest.h" // Test Function TEST(addOneTest, Positive) { EXPECT_EQ(1,addOne(0)); EXPECT_EQ(2,addOne(1)); EXPECT_EQ(40320, addOne(40319)); } TEST(addOneTest, Negative) { EXPECT_FALSE(addOneTest(-1)); } GTEST_API_ int main(int argc, char **argv) { testing::InitGoogleTest(&argc, argv); return RUN_ALL_TESTS(); }

Here is the console output:

$ g++ -isystem -pthread -c ${SOURCE_DIR}/proj1.c -o ${SOURCE_DIR}/proj1.o $ g++ -o ${SOURCE_DIR}/mytest ${SOURCE_DIR}/*.o -L${GTEST_DIR} libgtest.a /usr/lib/gcc/x86_64-linux-gnu/4.6/../../../x86_64-linux-gnu/crt1.o: In function `_start': (.text+0x20): undefined reference to `main' collect2: ld returned 1 exit status

Why is the main() function not been found by the linker?