GDB不会加载源文件

Question

1. 我正在使用arm-linux-gcc来在主机（debian i386）上编译一个简单的C文件-g。
2. 然后将a.out文件复制到目标（arm，uclibc）计算机。
3. 运行a.out-没关系。
4. gdb a.out它说，使用GDB（目标）并列出源代码No such file or directory。事实一直如此吗？
5. 如果我将1.c文件复制到目标，则list命令它列出源代码。

我的问题：

GDB一直都是这样，还是我可以控制其他选项？

您对调试程序有什么建议吗？

一些信息可能会有用：

源代码1.c文件 ：

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
// main function
int main(void)
{
    int i;
    for(i=0;i<3;i++){
        printf("i=%d\n",i);
    }
    return 0;
}

交叉编译版本（主机）

zodiac1111@debian:tmp$ arm-linux-gcc -v
Using built-in specs.
Target:arm-unknown-linux-uclibcgnueabi
Configured with:/home/ldsh/rt9x5/linux/buildroot/buildroot/output/toolchain/gcc-4.3.5/configure \
--prefix=/opt/rt9x5/arm-linux-uclibcgnueabi/usr --build=i686-pc-linux-gnu --host=i686-pc-linux-gnu \
--target=arm-unknown-linux-uclibcgnueabi --enable-languages=c,c++ \
--with-sysroot=/opt/rt9x5/arm-linux-uclibcgnueabi/usr/arm-unknown-linux-uclibcgnueabi/sysroot \
--with-build-time-tools=/opt/rt9x5/arm-linux-uclibcgnueabi/usr/arm-unknown-linux-uclibcgnueabi/bin \
--disable-__cxa_atexit --enable-target-optspace --disable-libgomp --with-gnu-ld --disable-libssp \
--disable-multilib --disable-tls --enable-shared --with-gmp=/opt/rt9x5/arm-linux-uclibcgnueabi/usr \
--with-mpfr=/opt/rt9x5/arm-linux-uclibcgnueabi/usr --enable-threads --disable-decimal-float \
--with-float=soft --with-abi=aapcs-linux --with-arch=armv5te --with-tune=arm926ej-s \
--with-pkgversion='Buildroot 2011.05-dirty' \
--with-bugurl=http://bugs.buildroot.net/ : (reconfigured) /home/ldsh/rt9x5/linux/buildroot/buildroot/output/toolchain/gcc-4.3.5/configure \
--prefix=/opt/rt9x5/arm-linux-uclibcgnueabi/usr --build=i686-pc-linux-gnu --host=i686-pc-linux-gnu \
--target=arm-unknown-linux-uclibcgnueabi --enable-languages=c,c++ \
--with-sysroot=/opt/rt9x5/arm-linux-uclibcgnueabi/usr/arm-unknown-linux-uclibcgnueabi/sysroot \
--with-build-time-tools=/opt/rt9x5/arm-linux-uclibcgnueabi/usr/arm-unknown-linux-uclibcgnueabi/bin \
--disable-__cxa_atexit --enable-target-optspace --disable-libgomp --with-gnu-ld --disable-libssp \
--disable-multilib --disable-tls --enable-shared --with-gmp=/opt/rt9x5/arm-linux-uclibcgnueabi/usr \
--with-mpfr=/opt/rt9x5/arm-linux-uclibcgnueabi/usr --enable-threads --disable-decimal-float \
--with-float=soft --with-abi=aapcs-linux --with-arch=armv5te --with-tune=arm926ej-s \
--with-pkgversion='Buildroot 2011.05-dirty' --with-bugurl=http://bugs.buildroot.net/
Thread model:posix
gcc version 4.3.5 (Buildroot 2011.05-dirty)

编译命令：

arm-linux-gcc -g 1.c

主办：

zodiac1111@debian:tmp$ uname -a
Linux debian 3.12-1-686-pae #1 SMP Debian 3.12.9-1 (2014-02-01) i686 GNU/Linux

目标：

# uname -a
Linux AT91SAM9-RT9x5 2.6.39 #25 Mon Dec 30 17:40:40 CST 2013 armv5tejl GNU/Linux

复制到目标后，然后：

# ls -l
total 1
-rwxr--r--    1 ftp      83            6094 Feb 21 15:19 a.out

执行可以

# ./a.out 
i=0
i=1
i=2

目标gdb版本

# gdb -v


dlopen failed on 'libthread_db.so.1' - File not found
GDB will not be able to debug pthreads.

GNU gdb 6.8
Copyright (C) 2008 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 "arm-unknown-linux-uclibcgnueabi".

调试一个

# gdb a.out 
<...>
(gdb) list
1   1.c: No such file or directory.
    in 1.c
(gdb) break main 
Breakpoint 1 at 0x847c: file 1.c, line 8.
(gdb) run 
Starting program: /data/a.out

Breakpoint 1, main () at 1.c:8
8   in 1.c
(gdb) step
9   in 1.c
    (gdb) p i
$1 = 0
(gdb) step
i=0
8   in 1.c
(gdb) p i
$2 = 0
(gdb) step
9   in 1.c
(gdb) p i
$3 = 1
(gdb)

如果我将源代码文件1.c复制到同一目录中

# ls -l
-rw-r--r--    1 ftp      83             158 Feb 21 15:51 1.c
-rwxr--r--    1 ftp      83            6094 Feb 21 15:19 a.out

gdb现在可以列出源代码。

# gdb a.out 
<...>
(gdb) list
warning: Source file is more recent than executable.
1   #include <stdio.h>
2   #include <string.h>
3   #include <stdlib.h>
4   // main function
5   int main(void)
6   {
7       int i;
8       for(i=0;i<3;i++){
9           printf("i=%d\n",i);
10      }
(gdb)

在主机平台上，如果我

1. gcc -g 1.c在宿主平台上编译。
2. 比 重命名 或 删除 的1.c文件。
3. 采用gdb a.out

发生相同的情况。

zodiac1111@debian:tmp$ gdb -v
GNU gdb (GDB) 7.6.2 (Debian 7.6.2-1)
Copyright (C) 2013 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 "i486-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
zodiac1111@debian:tmp$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/i486-linux-gnu/4.8/lto-wrapper
Target: i486-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Debian 4.8.2-14' --with-bugurl=file:///usr/share/doc/gcc-4.8/README.Bugs --enable-languages=c,c++,java,go,d,fortran,objc,obj-c++ --prefix=/usr --program-suffix=-4.8 --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.8 --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --enable-gnu-unique-object --disable-libmudflap --enable-plugin --with-system-zlib --disable-browser-plugin --enable-java-awt=gtk --enable-gtk-cairo --with-java-home=/usr/lib/jvm/java-1.5.0-gcj-4.8-i386/jre --enable-java-home --with-jvm-root-dir=/usr/lib/jvm/java-1.5.0-gcj-4.8-i386 --with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-4.8-i386 --with-arch-directory=i386 --with-ecj-jar=/usr/share/java/eclipse-ecj.jar --enable-objc-gc --enable-targets=all --enable-multiarch --with-arch-32=i586 --with-multilib-list=m32,m64,mx32 --with-tune=generic --enable-checking=release --build=i486-linux-gnu --host=i486-linux-gnu --target=i486-linux-gnu
Thread model: posix
gcc version 4.8.2 (Debian 4.8.2-14)

Answer 1

仔细
阅读GDB文档，尤其是有关源路径的文档。您要使用dir命令

另外，切换到较新的gdb（可能通过gdb从其源代码进行编译）。当前版本是7.7（所以6.8确实很旧）