Why won’t this simple C++ code compile with clang++?

2018-06-30 22:55:49

This question already has an answer here:

What is an undefined reference/unresolved external symbol error and how do I fix it? 27 answers

main.cpp includes test.h ; it does not include test.cpp . You can compile and link them at the same time by specifying them both as input:

[test]$ clang++ main.cpp test.cpp -o main

你错过了其他的cpp文件： clang++ main.cpp test.cpp -o main

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