我试图在我的cpp项目中使用gtest，并且可能存在链接错误。 它也无法识别测试文件夹中的主要内容。
Building target: MovieSystem
Invoking: Cross G++ Linker
g++ -o "MovieSystem" ./src/Actor.o ./src/Director.o ./src/Menu.o ./src/Movie.o ./src/Producer.o ./src/Professional.o ./src/ScreenWriter.o ./src/System.o ./src/factorial.o -lpthread
/usr/bin/ld: /usr/lib/debug/usr/lib/x86_64-linux-gnu/crt1.o(.debug_info): relocation 0 has invalid symbol index 11
/usr/bin/ld: /usr/lib/debug/usr/lib/x86_64-linux-gnu/crt1.o(.debug_info): relocation 1 has invalid symbol index 12
/usr/bin/ld: /usr/lib/debug/usr/lib/x86_64-linux-gnu/crt1.o(.debug_info): relocation 2 has invalid symbol index 2
/usr/bin/ld: /usr/lib/debug/usr/lib/x86_64-linux-gnu/crt1.o(.debug_info): relocation 3 has invalid symbol index 2
...
/usr/bin/ld: /usr/lib/debug/usr/lib/x86_64-linux-gnu/crt1.o(.debug_line): relocation 0 has invalid symbol index 2
/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../x86_64-linux-gnu/crt1.o: In function `_start':
(.text+0x20): undefined reference to `main'
collect2: error: ld returned 1 exit status
make: *** [MovieSystem] Error 1
请注意，我完全按照这里的说明操作： http://www.codeproject.com/Articles/811934/Cplusplus-unit-test-start-guide-how-to-set-up-Goog
那我做错了什么？ 谢谢！