ffmpeg - gdb 不会停在即使是微不足道的断点

Question

我正在尝试调试 ffplay (调试版本)使用 mingw-w64 编译在 msys2在 Windows 7 64 位上。我尝试使用 gdb 设置断点，它们似乎设置得很好，但程序并没有停止。所以我尝试发出 start ，它又一次没有停止。我尝试在 main 手动设置断点，但它仍然没有停止。我验证了 main找到了，确实如此。这是 session 的一部分。任何解释可能导致这种情况？

(gdb) start
Temporary breakpoint 1 at 0x140013f7c: file C:/Users/bubaruch/Documents/projects/ffmpeg/ffmpeg/ffplay.c, line 3756.
Starting program: C:\Users\bubaruch\Documents\projects\ffmpeg\b2\ffplay_g.exe
[New Thread 7752.0x275c]
ffplay version 2.8.git Copyright (c) 2003-2015 the FFmpeg developers
  built with gcc 5.2.0 (Rev4, Built by MSYS2 project)
  configuration: --disable-doc --disable-optimizations
  libavutil      55.  5.100 / 55.  5.100
  libavcodec     57. 15.100 / 57. 15.100
  libavformat    57. 14.100 / 57. 14.100
  libavdevice    57.  0.100 / 57.  0.100
  libavfilter     6. 15.100 /  6. 15.100
  libswscale      4.  0.100 /  4.  0.100
  libswresample   2.  0.101 /  2.  0.101
Simple media player
usage: ffplay [options] input_file

An input file must be specified
Use -h to get full help or, even better, run 'man ffplay'
[Inferior 1 (process 7752) exited with code 01]

(gdb) l main
3748       return 1;
3749    }
3750
3751    /* Called from the main */
3752    int main(int argc, char **argv)
3753    {
3754        int flags;
3755        VideoState *is;
3756        char dummy_videodriver[] = "SDL_VIDEODRIVER=dummy";
3757

(gdb) b main
Breakpoint 2 at 0x140013f7c: file C:/Users/bubaruch/Documents/projects/ffmpeg/ffmpeg/ffplay.c, line 3756.

(gdb) r
Starting program: C:\Users\bubaruch\Documents\projects\ffmpeg\b2\ffplay_g.exe
[New Thread 15388.0x3278]
ffplay version 2.8.git Copyright (c) 2003-2015 the FFmpeg developers
  built with gcc 5.2.0 (Rev4, Built by MSYS2 project)
  configuration: --disable-doc --disable-optimizations
  libavutil      55.  5.100 / 55.  5.100
  libavcodec     57. 15.100 / 57. 15.100
  libavformat    57. 14.100 / 57. 14.100
  libavdevice    57.  0.100 / 57.  0.100
  libavfilter     6. 15.100 /  6. 15.100
  libswscale      4.  0.100 /  4.  0.100
  libswresample   2.  0.101 /  2.  0.101
Simple media player
usage: ffplay [options] input_file

An input file must be specified
Use -h to get full help or, even better, run 'man ffplay'
[Inferior 1 (process 15388) exited with code 01]

Answer 1

来自 docs :

The ‘start’ command does the equivalent of setting a temporary breakpoint at the beginning of the main procedure and then invoking the ‘run’ command.

所以当你设置断点时你已经在 main 里面了。它再也不会到达，因为程序在 main 结束时退出。因此，断点永远不会触发。

我感觉您正试图在 ffmpeg 深处设置备用断点并调试更具体的东西，但这也没有触发。你为什么不问这个问题呢？对它的解释可能非常不同，可能与内联有关。