Boost 1-89 + GCC 15.2 (MSYS2 ucrt64, POSIX) – thread_local static_assert with Boost.Math

Hello,

After updating to Boost 1.89 I can no longer build my code that uses
boost::math::zeta() with a boost::multiprecision::mpfr_float custom type
(dynamic backend).
The compiler fails with:

static assertion failed: Your platform does not support thread_local with
non-trivial types,
last checked with Mingw-x64-8.1, Jan 2021.
Please try a Mingw build with the POSIX threading model,
see https://sourceforge.net/p/mingw-w64/bugs/527/

I use  Windows 11, MSYS2 ucrt64 toolchain GCC 15.2.0 (Thread model: posix)
. Boost also installed by MSYS2 ucrt64. Building from VS Code tasks with a
flag -pthread

Has anyone else encountered this with Boost 1.89 on MinGW-w64?
Are there recommended compiler flags or things to work around it?
For now I can only downgrade to Boost 1.88 - compile without problems.

Best regards, Ivo.

e [email protected]
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