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General (but related to Code::Blocks) / Re: C::B reports wxRecursionGuards error when loading a cbp project
« Last post by Pecan on February 21, 2026, 06:56:30 pm »Since some users report this assert in relation to clangd_client plugin,
I'll try to recreate the situation and find the cause.
It may take some time since I'm not proficient with Linux.
Gemini 3.0 explains this error as follows:
My query to Gemini 3.0:
clangd_client has some re-entrancy guards. But I do not remember calling wxWidgets to do the guarding.
But I'll check them out to see if there are some logic violations or any use of wxWidgets recursion guards.
I'll try to recreate the situation and find the cause.
It may take some time since I'm not proficient with Linux.
Gemini 3.0 explains this error as follows:
My query to Gemini 3.0:
Code
Please explain this message from wxWidgets that occurs more and more with Codeblocks IDE.
wxWidgets Debug Alert
A debugging check in this application has failed.
..\..\include/wx/recguard.h(36): assert "m_flag > 0" failed in ~wxRecursionGuard(): unbalanced wxRecursionGuards!?
Gemini responded;
This specific error is a classic "housekeeping" alert from the wxWidgets library. In short, the program is telling you that it tried to clean up a safety mechanism, but the math didn't add up.
What is a Recursion Guard?
A wxRecursionGuard is a tool developers use to prevent a function from calling itself infinitely (which would crash the program). Think of it like a "Do Not Enter" sign that a function hangs on its door when it starts working. When the function finishes, it takes the sign down.
The error assert "m_flag > 0" failed means that when the function finished and went to take the sign down, it found the sign was already gone - or it found "negative" signs. This is what the message means by "unbalanced."
Why is this happening in Code::Blocks?
Code::Blocks is built using wxWidgets. You are seeing this more often likely due to one of three reasons:
UI Event Races: Code::Blocks is trying to process a UI event (like a mouse click or a window redraw) while another event is still finishing. This is common if you are clicking rapidly or if the IDE is lagging.
Plugin Conflicts: A specific plugin (like Code Completion or Symbol Browser) might be triggering a "re-entrant" call, where it starts a task, gets interrupted, and fails to clean up its state properly.
Build/Version Mismatch: If you recently updated your OS or the IDE, there might be a slight incompatibility in how messages are passed between the system and the wxWidgets layer.
How to Fix or Bypass It
Since this is a Debug Alert, it is technically a warning for the developers of Code::Blocks, not necessarily a sign that your code is broken.
The "Ignore" Method: Click "Yes" to continue (this usually ignores the specific failure) or "No" to stop debugging. If you click "Cancel," it will likely crash the IDE to trigger a debugger.
Update Code::Blocks: Check if there is a newer "Nightly Build" or stable release. These "unbalanced guard" bugs are frequently patched in newer revisions.
Disable Heavy Plugins: Go to Plugins -> Manage plugins and try disabling non-essential ones (like "SpellChecker" or "Occurrences Highlight") to see if the frequency drops.
The "Silent" Route: If it is driving you crazy, you can run the "non-debug" version of Code::Blocks (the release build), which typically strips out these assert checks so they don't pop up.
clangd_client has some re-entrancy guards. But I do not remember calling wxWidgets to do the guarding.
But I'll check them out to see if there are some logic violations or any use of wxWidgets recursion guards.