GDB 不起作用 - 不是可执行格式？

Question

When trying to run gdb with gdb ./mm.c I'm getting the following error:

"0x7ffee71424c0s": not in executable format: file format not recognise

Does someone recognise this error and can help me to fix it?

Answer 1

C is (usually) a compiled language (vs. interpreted language such as (usually) JavaScript).

Your computer "speaks" 0 s and 1 s, not for and if .
The source code you write (the for s and if s) needs to be translated (compiled) to the proper 0 s and 1 s. That is the job of the compiler.

gcc -Wall -Wextra nm.c -O0 -ggdb -oexefile
^^^                                             compile
                  ^^^^                          the fors and ifs in nm.c
                                 ^^^^^^^^^      into 0s and 1s in exefile
    ^^^^^^^^^^^^^                               warn about most common mistakes
                       ^^^                      do not optimize
                           ^^^^^                and output debug information for gdb

Then the job of the debugger is to show the 0 s and 1 s (grouped back to the original source lines when possible) as they execute, statement by statement

gdb ./exefile

With optimizations, the compiler would (very possibly) make 0 s and 1 s with no relation to the original for s and if s, making it impossible for gdb to associate them with original for and if statements.