Clang 铿锵++；LSAN和UBSAN导致对`u UBSAN_handle_add_overflow'；

当我在玩编译器清理程序时，我被这个链接错误弄糊涂了，因为在

clang++

上只启用了LSAN和UBSAN

请注意，当我删除

-fsanitize=leak

或将这些标志添加到一起时，链接问题消失了：

-fsanitize=leak-fsanitize trap=undefined

还要注意，这种奇怪的链接错误似乎只有在使用

clang++

时才会发生

g++

在下面显示的所有情况下都工作得很好

$ clang++-11 -fsanitize=undefined ../main.cpp && ./a.out
../main.cpp:17:5: runtime error: signed integer overflow: 2147483647 + 1 cannot be represented in type 'int'
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior ../main.cpp:17:5 in

$ clang++-11 -fsanitize=undefined -fsanitize=leak ../main.cpp && ./a.out
/usr/bin/ld: /tmp/main-920ee1.o: in function `main':
main.cpp:(.text+0x6a): undefined reference to `__ubsan_handle_add_overflow'
clang: error: linker command failed with exit code 1 (use -v to see invocation)

$ clang++-11 -fsanitize=undefined -fsanitize=leak -fsanitize-trap=undefined ../main.cpp && ./a.out
Illegal instruction

$ clang++-11 -v
Debian clang version 11.0.0-2
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/10
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/10
Selected GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/10
Candidate multilib: .;@m64
Selected multilib: .;@m64

任何线索都有帮助。Thx

如果您需要

main.cpp

的源代码（您可能从未这样做过）：

int main(int argc, char **argv) {
  int k = 0x7fffffff;
  k += argc;
  return 0;
}