gcc - 需要 GLibc 优化

Question

为什么不能重新编译 GLibc 关闭所有优化(即 -O0)？

特别是在这样做时:

make CFLAGS='-O0 -w' CXXFLAGS='-O0 -w'

我得到:

 #error "glibc cannot be compiled without optimization"

Answer 1

当我谷歌错误时，第一个结果 tells我到底是为什么。

"In the early startup of the dynamic loader (_dl_start), before relocation of the PLT, you cannot make function calls. You must inline the functions you will use during early startup, or call compiler builtins (__builtin_*).

Without optimizations enabled GCC will not inline functions. The early startup of the dynamic loader will make function calls via an unrelocated PLT and crash." -- Carlos O'Donell