Bump cmake_minimum_required 3.0 -> 3.16 (CMake 4.x compatibility)#11
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CMake 4.x removed support for declared minimums below 3.5, so the old 3.0 floor fails to configure on recent toolchains (e.g. tdaq-13-00-00 / CMake 4.3.1). 3.16 matches the quasar framework's standardized minimum (>=3.5 for CMake 4.x, <=3.26 for AlmaLinux 9) and keeps mule consistent with the rest of the ecosystem. Demo/CMakeLists.txt aligned to 3.16 too.
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Jun 7, 2026
CMake 4.x removed support for declared minimums below 3.5, so the old 3.0 floor fails to configure on recent toolchains (e.g. tdaq-13-00-00 / CMake 4.3.1). 3.16 matches the quasar framework's standardized minimum (>=3.5 for CMake 4.x, <=3.26 for AlmaLinux 9) and keeps mule consistent with the rest of the ecosystem. Demo/CMakeLists.txt aligned to 3.16 too.
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What
Bump
cmake_minimum_requiredfrom 3.0 to 3.16 in the rootCMakeLists.txt(and 3.10 -> 3.16 inDemo/CMakeLists.txtfor consistency).Why
CMake 4.x removed support for declared minimums below 3.5, so the old 3.0 floor is a hard configure failure on recent toolchains (e.g.
tdaq-13-00-00/ CMake 4.3.1) — the same failure mode as OPCUA-3334. 3.16 is the value the quasar framework is standardizing on (>=3.5 for CMake 4.x, <=3.26 for AlmaLinux 9's default CMake), keeping mule consistent with the rest of the ecosystem.No functional change beyond the minimum; mule already builds on CMake >> 3.16 on all supported platforms.