Logging Output

For various kinds of problems, it helps to see what LibrePCB internally does and what low-level errors occurred but aren’t displayed (in every detail) in the graphical user interface.

Those messages are always written to stderr — To see them, just run LibrePCB from a terminal. Note that on Windows you have to redirect stderr to a file and open the file in Notepad afterwards.

Windows cmd.exe (PowerShell doesn’t work!)

"C:\Program Files\LibrePCB\bin\librepcb.exe" > log.txt 2>&1

After closing LibrePCB, open C:\Users\%USERNAME%\log.txt in Notepad.

MacOS Terminal

/Applications/LibrePCB.app/Contents/MacOS/librepcb

Linux/UNIX Shell

/path/to/librepcb

Currently this is the only way to get logging messages. Logging to a file is not implemented yet, and the verbosity cannot be configured.

Example Output

./librepcb-1.1.0-linux-x86_64-qt6.AppImage
[  INFO   ] LibrePCB 1.1.0 (18a3d4589)
[  INFO   ] Qt version: 6.6.2 (compiled against 6.6.2)
[  INFO   ] Resources directory: "/tmp/.mount_librepHOglKc/opt/share/librepcb"
[  INFO   ] Application settings: "/home/user/.config/LibrePCB/LibrePCB.ini"
[  INFO   ] Cache directory: "/home/user/.cache/LibrePCB/LibrePCB"
[DEBUG-MSG] Network access manager thread started.
[DEBUG-MSG] Recently used workspace: "/home/user/LibrePCB-Workspace"
[DEBUG-MSG] Detected light theme based on window background color #efefef.
[DEBUG-MSG] Open workspace data directory "/home/user/LibrePCB-Workspace/data"...
[DEBUG-MSG] Load workspace settings...
[DEBUG-MSG] Successfully loaded workspace settings.
[DEBUG-MSG] Load workspace library database...
[DEBUG-MSG] Successfully loaded workspace library database.
[DEBUG-MSG] Successfully opened workspace.
[DEBUG-MSG] Workspace library scanner thread started.
[  INFO   ] Loaded parts information cache from "/home/user/.cache/LibrePCB/LibrePCB/parts.lp".
[DEBUG-MSG] Cleaned outdated live information about 0 parts.
[DEBUG-MSG] Start workspace library scan in worker thread...
[DEBUG-MSG] Workspace libraries indexed: 47 libraries in 25 ms.
[DEBUG-MSG] Workspace library scan succeeded: 5515 elements in 12876 ms.
[DEBUG-MSG] Network access manager thread stopped.
[DEBUG-MSG] Workspace library scanner thread stopped.
[DEBUG-MSG] Exit application with code 0.