一个xcode的link问题解决(profile-instr-g

xcode编译链接的时候遇到下面这个问题。

image.png

解决方法是：Other Linker Flags里加一下这个-fprofile-instr-generate

查了一下关于profile-instr-generate的说明如下：

-fprofile-instr-generate=<file>
                          Generate instrumented code to collect execution counts into <file>
                          (overridden by LLVM_PROFILE_FILE env var)
  -fprofile-instr-generate
                          Generate instrumented code to collect execution counts into default.profraw file
                          (overridden by '=' form of option or LLVM_PROFILE_FILE env var)

参考文档：profiling-with-instrumentation