GDB 不会加载源文件 [英] GDB won't load source file
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问题描述
- 我正在使用
arm-linux-gcc在主机 (debian i386) 上使用-g编译一个简单的 C 文件. - 然后将
a.out文件复制到目标(arm,uclibc)计算机上. - 运行
a.out- 没问题. - 使用 GDB (target)
gdb a.out并列出源代码，上面写着No such file or directory.事实一直如此? - 如果我将
1.c文件复制到目标，那么list命令会列出源代码.
- I'm using
arm-linux-gccto compile a simple C file at host (debian i386) with-g. - Then copy the
a.outfile to the target (arm,uclibc) computer. - Run the
a.out– it's just ok. - Use GDB (target)
gdb a.outand list the source code, it saysNo such file or directory. The fact has always been so? - If I copy the
1.cfile to the target, thenlistcommand 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
",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
主持人:
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，则:
# ls -l
total 1
-rwxr--r-- 1 ftp 83 6094 Feb 21 15:19 a.out
执行没问题
# ./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
$3 = 1
(gdb)
如果我将源代码文件1.c复制到同一目录中
# ls -l
-rw-r--r-- 1 ftp 83 158 Feb 21 15:51 1.c
-rwxr--r-- 1 ftp 83 6094 Feb 21 15:19 a.out
gdb 现在可以列出源代码了.
# gdb a.out
<...>
(gdb) list
warning: Source file is more recent than executable.
1 #include <stdio.h>
2 #include <string.h>
3 #include <stdlib.h>
4 // main function
5 int main(void)
6 {
7 int i;
8 for(i=0;i<3;i++){
9 printf("i=%d
",i);
10 }
(gdb)
在主机平台，如果我
- 在主机平台上使用
gcc -g 1.c编译. - 重命名或删除
1.c文件. - 使用
gdb a.out
- compile with
gcc -g 1.cat host platform. - than rename or remove the
1.cfile. - Use
gdb a.out
同样的情况也会发生.
zodiac1111@debian:tmp$ 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 GDB 文档 特别是关于 源路径.你想使用 dir 命令
Read carefully the documentation of GDB notably about source path. You want to use the dir command
另外，切换到较新的 gdb(可能通过从其源代码编译 gdb).当前版本是 7.7(所以 6.8 真的很旧)
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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