我可以制作模板 function noinline 还是强制它出现在分析器中？

Question

I'm trying to profile with perf on Ubuntu 20.04, but the problem is that many functions do not appear in it (likely because they are inlined), or only their addresses appear (without names etc.). I'm using CMake's RelWithDebInfo build. But there are some template functions that I don't know how to bring to the profiler results. I think marking them noinline may help if this is legal in C++ for template functions, but this screws up the codebase and needs to be done per-function. Any suggestions how to make all functions noinline at once?

Answer 1

You could add -fno-inline to CMAKE_CXX_FLAGS .

From GCC man page :

 -fno-inline Do not expand any functions inline apart from those marked with the "always_inline" attribute. This is the default when not optimizing. Single functions can be exempted from inlining by marking them with the "noinline" attribute.