Modules using STL fail to start if ZNC is built with --enable-debug #126

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2026-10-05T04:00:18+02:00

adam commented

2026-10-05 04:00:18 +02:00

Steps to reproduce:

Use ZNC compiled with --enable-debug
Add #include <map> at the top of sample.cpp
znc-buildmod sample.cpp
loadmod sample

Unable to find modinfo [sample] [Unable to open module [sample] [/home/xxx/.znc/modules/sample.so: undefined symbol: _ZN7CModule13OnClientCapLsEP7CClientRSt3setI7CStringSt4lessIS3_ESaIS3_EE]]

#### Steps to reproduce: 1. Use ZNC compiled with --enable-debug 2. Add `#include <map>` at the top of sample.cpp 3. znc-buildmod sample.cpp 4. loadmod sample > Unable to find modinfo [sample] [Unable to open module [sample] [/home/xxx/.znc/modules/sample.so: undefined symbol: _ZN7CModule13OnClientCapLsEP7CClientRSt3setI7CStringSt4lessIS3_ESaIS3_EE]]

adam closed this issue

2026-10-05 04:00:18 +02:00

adam commented

2026-10-05 04:00:19 +02:00

Fix: Add #include <znc/zncconfig.h> before any STL library.

**Fix:** Add `#include <znc/zncconfig.h>` before any STL library.

adam commented

2026-10-05 04:00:20 +02:00

Yeh, zncconfig.h or any other ZNC header.
All of them already include zncconfig.h, and you'll need to include at least Modules.h anyway to write a module.

So, this works:

#include <znc/Modules.h>
#include <map>

Yeh, zncconfig.h or any other ZNC header. All of them already include zncconfig.h, and you'll need to include at least Modules.h anyway to write a module. So, this works: ``` #include <znc/Modules.h> #include <map> ```

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Reference: adam/znc#126