Difference between revisions of "Tutorial for gdb debug under Win32"
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| − | + | {{See also|Debug}} | |
| − | + | The point of this page is to show you how to get VLC related crash info with a tool called '''gdb'''. | |
| + | |||
| + | This crash info is '''VERY''' useful when tracking down the reason for the crash, so if you can provide us with this info, the likelihood of getting your bug fixed is much higher. | ||
== What you need == | == What you need == | ||
| − | * | + | * Windows computer |
| − | * | + | * 32-bit VLC build (this tutorial isn't for 64-bit VLC builds, but it will work for 64-bit Windows versions that run 32-bit VLC). |
| + | * A way to crash VLC (freezes aren't useful unfortunately) | ||
== What you have to do == | == What you have to do == | ||
| Line 18: | Line 21: | ||
*Tool called 7-Zip can be used to extract .7z packages | *Tool called 7-Zip can be used to extract .7z packages | ||
| − | *Folder doesn't really matter. So you '''don't''' have to uninstall your current VLC version. | + | *Folder doesn't really matter. So you '''don't''' have to uninstall your current VLC version. And you can have multiple VLC versions in your computer. |
| + | |||
| + | [[File:Vlc_gdb_nofolder.png]] | ||
3. Run vlc.exe from that folder and see if you can replicate the issue that is causing your current VLC to crash. | 3. Run vlc.exe from that folder and see if you can replicate the issue that is causing your current VLC to crash. | ||
| Line 24: | Line 29: | ||
*Some issues might be already fixed, so it might not be possible to replicate the crash | *Some issues might be already fixed, so it might not be possible to replicate the crash | ||
| − | 4. If you can replicate the issue, next step is to download gdb debugger from | + | 4. If you can replicate the issue, next step is to download gdb debugger from ftp://ftp.equation.com/gdb/32/gdb.exe |
| − | |||
| − | |||
| − | + | 5. Copy the gdb.exe to the same directory where you extracted the VLC debug build | |
[[File:Vlc_gdb_folder.png]] | [[File:Vlc_gdb_folder.png]] | ||
| Line 42: | Line 45: | ||
[[File:Vlc_gdb_target_exec.png]] | [[File:Vlc_gdb_target_exec.png]] | ||
| − | 8. Type in ''run'' and VLC should start | + | 8. Type in ''run'' and VLC should start after few moments |
*first vlc.exe startup might take some time, so please wait | *first vlc.exe startup might take some time, so please wait | ||
| Line 51: | Line 54: | ||
*certain crashes might not happen when vlc.exe is run via gdb.exe, so crash might not happen | *certain crashes might not happen when vlc.exe is run via gdb.exe, so crash might not happen | ||
| + | *crashes can be noticed from gdb console, which shows "Program received signal..." message | ||
| − | 10. Once vlc.exe has crashed, type in ''bt'' | + | [[File:Vlc_gdb_signal.png]] |
| + | |||
| + | 10. Once vlc.exe has crashed, type in ''bt'' to the gdb console | ||
| − | |||
*bt is short for backtrace | *bt is short for backtrace | ||
[[File:Vlc_gdb_bt.png]] | [[File:Vlc_gdb_bt.png]] | ||
| − | 11. Share us the info that bt command gave | + | 11. Share us the info that bt command gave |
*right click the gdb window and select Edit -> Mark to mark the text you want to copy, and then left click to select area, then right click to copy it to clipboard | *right click the gdb window and select Edit -> Mark to mark the text you want to copy, and then left click to select area, then right click to copy it to clipboard | ||
| + | *you can share us info via trac, via IRC, via forums etc. | ||
| + | |||
| + | [[File:Vlc_gdb_marked.png]] | ||
12. You can close the gdb by typing ''quit'' | 12. You can close the gdb by typing ''quit'' | ||
*you can answer ''y'' to the question | *you can answer ''y'' to the question | ||
| + | |||
| + | [[File:Vlc_gdb_quit.png]] | ||
| + | |||
| + | [[Category:Building]] | ||
| + | [[Category:Coding]] | ||
| + | [[Category:Windows]] | ||
Latest revision as of 09:02, 19 March 2019
See also: Debug
The point of this page is to show you how to get VLC related crash info with a tool called gdb.
This crash info is VERY useful when tracking down the reason for the crash, so if you can provide us with this info, the likelihood of getting your bug fixed is much higher.
What you need
- Windows computer
- 32-bit VLC build (this tutorial isn't for 64-bit VLC builds, but it will work for 64-bit Windows versions that run 32-bit VLC).
- A way to crash VLC (freezes aren't useful unfortunately)
What you have to do
1. Download latest nightly debug build of VLC from http://nightlies.videolan.org/build/win32/?C=M;O=D
- Trunk folders are current development (unstable) version, Branch folders are current/next stable versions (usually you want latest branch folder)
- Make sure you take the debug version. It is usually named as vlc-x.y.z-something-date-randomnumber-win32-debug.7z or vlc-x.y.z-something-date-randomnumber-win32-debug.zip
2. Extract the .zip/.7z to somewhere (like in your desktop)
- Tool called 7-Zip can be used to extract .7z packages
- Folder doesn't really matter. So you don't have to uninstall your current VLC version. And you can have multiple VLC versions in your computer.
3. Run vlc.exe from that folder and see if you can replicate the issue that is causing your current VLC to crash.
- Some issues might be already fixed, so it might not be possible to replicate the crash
4. If you can replicate the issue, next step is to download gdb debugger from ftp://ftp.equation.com/gdb/32/gdb.exe
5. Copy the gdb.exe to the same directory where you extracted the VLC debug build
6. Launch gdb.exe by double clicking it
- You can also launch it via .bat or by other method
7. Type in target exec vlc and press enter
- gdb takes commands via this terminal
8. Type in run and VLC should start after few moments
- first vlc.exe startup might take some time, so please wait
9. After vlc.exe is launched, repeat the actions that crash VLC
- certain crashes might not happen when vlc.exe is run via gdb.exe, so crash might not happen
- crashes can be noticed from gdb console, which shows "Program received signal..." message
10. Once vlc.exe has crashed, type in bt to the gdb console
- bt is short for backtrace
11. Share us the info that bt command gave
- right click the gdb window and select Edit -> Mark to mark the text you want to copy, and then left click to select area, then right click to copy it to clipboard
- you can share us info via trac, via IRC, via forums etc.
12. You can close the gdb by typing quit
- you can answer y to the question
