我的操作系统是Arch Linux
,而test.c
程序非常简单:
# cat test.c
#include <stdio.h>
int main(void) {
printf("Hello world!\n");
}
编译时不要使用-g
选项,并使用file
命令检查可执行文件信息:
# gcc test.c
# file a.out
a.out: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, for GNU/Linux 2.6.32, BuildID[sha1]=c7a538046222b5209d2daafbfc246de341a652d9, not stripped, with debug_info
file
命令输出 "not stripped, with debug_info",但我在编译过程中并没有使用 -g
选项。请使用 gdb
调试 a.out
文件:
# gdb a.out
GNU gdb (GDB) 7.12.1
Copyright (C) 2017 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-pc-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from a.out...(no debugging symbols found)...done.
(gdb)
我可以看到
gdb
也会提示 "Reading symbols from a.out...(no debugging symbols found)...done.
"。为什么在编译时没有使用 "
-g
" 选项,file
命令会报告可执行文件的 "not stripped, with debug_info
"?