Faced this issue just this morning. After reading up on it a bit, I realised I had MinGW with Win32 threads installed. A new clean install of MinGW with posix threads
and the issue gets resolved.
Link to original Win32 vs pthread post : mingw-w64 threads: posix vs win32
The version of GCC that CodeBlocks ships with doesn't support threads (or at least it was the case last time I checked). You'll have to install a better compiler, and configure CB to use it.
You can get a fresh version of GCC from MSYS2. Or you can install one of the numerous MinGW-w64 distributions.
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