这件装配如何工作？

I recently needed to debug a program at assembly level. I don't have a lot of assembler experience, so I figured I'd write some simple C programs and single-step through them in order to get a feeling for the language before I'd start debugging other peoples code. However, I really don't get what gcc made of these two lines (compiled with -ggdb -O0):I recently needed to debug a program at assembl