-fno-omit-frame-pointer相当于clang的编译器选项 [英] -fno-omit-frame-pointer equivalent compiler option for clang

问题描述

我想使用 DS-5 Streamline Profiler 来分析我的代码。在其文档中提到要能够看到调用堆栈，我们需要使用编译器选项 -fno-omit-frame-pointer 来编译代码。此选项在gcc中。
还有clang的等效选项吗？

I want to use DS-5 Streamline profiler to profile my code. In the documentation its mentioned that to be able to see call stacks, we need to compile code with compiler option -fno-omit-frame-pointer. This option is there in gcc. Is there an equivalent option for clang also?

-fno-omit-frame-pointer 是

我也尝试将编译器优化级别设置为0，但仍然无法简化调用堆栈。

I have also tried setting the compiler optimization level to 0, but still I am not getting call stacks in streamline.

推荐答案

DS-5似乎是ARM的东西，因此可能不相关，但是我遇到了类似的问题，试图获得良好的堆栈使用Linux的 perf分析器来跟踪使用clang编译的可执行文件。

It looks like DS-5 is an ARM thing, so this might not be relevant, but I ran into a similar issue trying to get good stack traces out of a clang-compiled executable using Linux's perf profiler.

问题最终是，至少在x86-64 Linux上，Clang需要 -fno-omit-frame-pointer 和 -mno-omit-leaf-frame-pointer 以获得与gcc仅使用 -fno-omit-框架指针。看到以下LLVM错误：同时需要-fno-omit-frame-pointer和-mno-omit -leaf-frame-pointer在叶函数上在Linux上获得fp

The problem ended up being that, on x86-64 Linux at least, Clang requires both -fno-omit-frame-pointer and -mno-omit-leaf-frame-pointer in order to get the same behavior that gcc gives with only -fno-omit-frame-pointer. See this LLVM bug: "Need both -fno-omit-frame-pointer and -mno-omit-leaf-frame-pointer to get a fp on linux on a leaf function"

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