GDB 抱怨缺少 raise.c

2021-12-17 00:00:00 exception gdb c++

每次 gdb 捕获异常时，我都会收到一个烦人的错误.我已经运行了以下示例程序

#include int main() {抛出 std::invalid_argument("");返回0；}

运行 gdb 的结果是

 在抛出一个 'std::invalid_argument' 实例后调用终止什么():程序收到信号 SIGABRT，中止.__GI_raise (sig=sig@entry=6) 在 ../sysdeps/unix/sysv/linux/raise.c:5151 ../sysdeps/unix/sysv/linux/raise.c:没有这样的文件或目录.

这还不算太糟，因为我确实得到了我需要的信息，只是让我烦恼...

有人知道如何解决这个问题吗?

解决方案

要在 Ubuntu 上对 C 库进行完整的源代码调试，只需几个步骤:

  1. 安装 libc6 的 debuginfo 版本.

    它可能已经安装 - Ubuntu 上的 gdb 软件包依赖于它 - 但如果没有，请运行 sudo apt install libc6-dbg.

  2. 准备包系统以下载和处理源代码包(如果之前尚未完成).

    sudo apt install dpkg-devgrep deb-src/etc/apt/sources.list

    Grep 的输出应该显示(并且可能还有我们不需要担心的其他匹配项):

    <块引用>

    deb-src http://archive.ubuntu.com/ubuntu/bionic main 受限deb-src http://archive.ubuntu.com/ubuntu/bionic-updates main 受限

    如果 grep 显示这些 deb-src 行用 # 注释掉:

    <块引用>

    # deb-src http://archive.ubuntu.com/ubuntu/bionic main 受限# deb-src http://archive.ubuntu.com/ubuntu/bionic-updates main 受限

    然后编辑/etc/apt/sources.list删除这些行开头的#，然后运行sudo apt update.

  3. 下载与安装的C库版本对应的源代码.

    首先，在任何地方创建一个目录 - 我将在这里使用 /opt/src.

    然后执行以下操作:

    cd/opt/srcapt源libc6

    如果 apt 命令给出类似

    的错误信息<块引用>

    E:您必须在您的 sources.list 中放入一些源"URI

    那么我在第 2 步中的说明可能已经过时了；在这里发表评论.

    下载完成后，运行:

    find $PWD -maxdepth 1 -type d -name 'glibc*'

    记住这个名字 - 它类似于 /opt/src/glibc-2.23

  4. 确定 gdb 希望在哪里找到源代码并进行适当的调整.

    运行 gdb，让它运行你的程序直到它停止，然后在 gdb 提示符下执行以下操作:

    (gdb) 信息源当前源文件是 ../sysdeps/unix/sysv/linux/raise.c编译目录为/build/glibc-KM3i_a/glibc-2.23/signal

    所以 gdb 期望源代码在 /build/glibc-KM3i_a/glibc-2.23 中.有两种方法可以解决此问题:

    • 移动(或使用符号链接)使源代码位于(或看起来)位于 /build/glibc-KM3i_a/glibc-2.23 中.

      或者

    • 告诉 gdb 如何替换正确的源目录路径名:

      (gdb) 设置替代路径/build/glibc-KM3i_a/glibc-2.23/opt/src/glibc-2.23

    现在，回到你的框架，gdb 应该显示源代码行:

    (gdb) 第 1 帧#1 0xb7e2fea9 in __GI_raise (sig=6) at ../sysdeps/unix/sysv/linux/raise.c:54返回 INLINE_SYSCALL (tgkill, 3, pid, selftid, sig);

I'm getting an an annoying error every time gdb catches an exception. I've run the following example program

#include <stdexcept>

int main() {
  throw std::invalid_argument("");
  return 0;
}

And the result from running gdb is

terminate called after throwing an instance of 'std::invalid_argument'
  what():  

Program received signal SIGABRT, Aborted.
__GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:51
51  ../sysdeps/unix/sysv/linux/raise.c: No such file or directory.

It's not all that bad, as I do get the information I need, it's just bugging me...

Do anyone know how to fix this?

解决方案

To do full source code debugging of the C library on Ubuntu, there are just a few steps to take:

  1. Install the debuginfo version of libc6.

    It's probably already installed - the gdb package on Ubuntu has a dependency on it - but in case it isn't, run sudo apt install libc6-dbg.

  2. Prepare the package system to download and process source code packages, if this hasn't previously been done.

    sudo apt install dpkg-dev
grep deb-src /etc/apt/sources.list

    Grep's output should show (and there may be additional matches that we don't need to worry about):

    deb-src http://archive.ubuntu.com/ubuntu/ bionic main restricted
deb-src http://archive.ubuntu.com/ubuntu/ bionic-updates main restricted

    If the grep shows that these deb-src lines are commented out with #:

    # deb-src http://archive.ubuntu.com/ubuntu/ bionic main restricted
# deb-src http://archive.ubuntu.com/ubuntu/ bionic-updates main restricted

    then edit /etc/apt/sources.list to remove the # at the beginning of these lines and then run sudo apt update .

  3. Download the source code corresponding to the installed version of the C library.

    First, create a directory anywhere - I'll use /opt/src here.

    Then do the following:

    cd /opt/src
apt source libc6

    If the apt command gives an error message like

    E: You must put some 'source' URIs in your sources.list

    then my instructions in step 2 may have become outdated; post a comment here.

    When the download is complete, run this:

    find $PWD -maxdepth 1 -type d -name 'glibc*'

    Remember this name - it'll be something like /opt/src/glibc-2.23

  4. Determine where gdb expects to find the source code and make appropriate adjustments.

    Run gdb, have it run your program until it stops, and at the gdb prompt do this:

    (gdb) info source
Current source file is ../sysdeps/unix/sysv/linux/raise.c
Compilation directory is /build/glibc-KM3i_a/glibc-2.23/signal

    So gdb is expecting the source code to be in /build/glibc-KM3i_a/glibc-2.23 . There are two ways to fix this:

    • Move (or use a symlink) so that the source code is (or appears to be) in /build/glibc-KM3i_a/glibc-2.23 .

      or

    • Tell gdb how to substitute the correct source directory pathname:

      (gdb) set substitute-path /build/glibc-KM3i_a/glibc-2.23 /opt/src/glibc-2.23

    Now, go back to your frame, and gdb should show the source code line:

    (gdb) frame 1
#1 0xb7e2fea9 in __GI_raise (sig=6) at ../sysdeps/unix/sysv/linux/raise.c:54
         return INLINE_SYSCALL (tgkill, 3, pid, selftid, sig);

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