GDB不会加载源文件 [英] GDB won't load source file

问题描述

1. 我正在使用arm-linux-gcc通过-g在主机(debian i386)上编译一个简单的C文件.
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. 使用GDB(目标)gdb a.out并列出源代码，显示为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命令将列出源代码.

1. I'm using arm-linux-gcc to compile a simple C file at host (debian i386) with -g.
2. Then copy the a.out file to the target (arm,uclibc) computer.
3. Run the a.out – it's just ok.
4. Use GDB (target) gdb a.out and list the source code, it says No such file or directory. The fact has always been so?
5. If I copy the 1.c file to the target, then list command it lists the source code.

我的问题:

一些信息可能有用:

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

主机:

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

执行正常

# ./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a.out

# 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

# 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. 在主机平台上使用gcc -g 1.c进行编译.
2. 比重命名或删除 1.c文件.
3. 使用gdb a.out

1. compile with gcc -g 1.c at host platform.
2. than rename or remove the 1.c file.
3. Usegdb 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) 

推荐答案

仔细阅读 源路径.您要使用dir命令

Read carefully the documentation of GDB notably about source path. You want to use the dir command

此外，切换到较新的gdb(也许通过从其源代码编译gdb).当前版本是7.7(所以6.8确实很旧)

Also, switch to a newer gdb (perhaps by compiling gdb from its source code). Current version is 7.7 (so 6.8 is really old)

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