[CMAKE] Fix CMake 4.x build error on MacOS runner and when building opentracing #3649
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dbarker
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Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## main #3649 +/- ##
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- Coverage 90.09% 90.08% -0.01%
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Files 220 220
Lines 7110 7110
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- Hits 6405 6404 -1
- Misses 705 706 +1 🚀 New features to boost your workflow:
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…ronment variable when building opentracing-cpp to support cmake 4.x
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dbarker
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Sep 21, 2025
| INSTALL_TEST_DIR: '/Users/runner/install_test' | ||
| CXX_STANDARD: '17' | ||
| CMAKE_TOOLCHAIN_FILE: '/Users/runner/conan/build/Debug/generators/conan_toolchain.cmake' | ||
| CMAKE_VERSION: 3.31.0 # building the conan "stable" versions requires CMake 3.x |
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Downgrading is the most direct and stable solution to fix the CMake 4.x build issue. Many of the dependencies in this "stable" version set depend on CMake versions < 3.5. Later versions of the dependencies (with the exception of opentracing has a minimum of 3.1) build with CMake 4.x.
dbarker
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marcalff
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Sep 22, 2025
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Fixes #3648
CMake 4.x removed compatibility with versions older than 3.5.
https://cmake.org/cmake/help/latest/release/4.0.html#deprecated-and-removed-features
OpenTracing is no longer being updated and sets the minimum CMake version required to 3.1. This creates a CMake configure error when using CMake 4.x.
Older versions of many dependencies depend on minimum versions of CMake < 3.5 (those in the
install/cmake/third_party_<minimum,stable>andinstall/conan/conanfile_stable.txt).Changes
CMAKE_POLICY_VERSION_MINIMUM=3.5when building opentracing-cpp from source using FetchContentconanfile_stable.txtdependency versions.For significant contributions please make sure you have completed the following items:
CHANGELOG.mdupdated for non-trivial changes