[cmake] fix MASTER_PROJECT heuristic; only enable install if root
#4536
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…roject SOURCE vs CURRENT_SOURCE is unreliable. `DEFINED PROJECT_NAME` is a much more portable way of determination. Also, installation shouldn't default to on if it is a subproject.
crueter
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MASTER_PROJECT heuristic; only enable install if root
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Thanks for the PR but could you elaborate why the current check is unreliable? |
With CPM.cmake and I believe FetchContent, FMT_MASTER_PROJECT would always evaluate to ON since those set CMAKE_SOURCE_DIR to CMAKE_CURRENT_SOURCE_DIR for this subdirectory. I remember there being some good reason for this but I can't recall exactly what it is; regardless, with this change, FMT_MASTER_PROJECT now works in all scenarios I tried: CPM, FetchContent, Git submodules, and as a standalone project. |
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Merged, thanks! |
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Sep 30, 2025
`fmtlib` version was updated to 12.0.0 in #163441. In this new version, due to fmtlib/fmt#4536, PyTorch started not installing `fmtlib` headers anymore. Because of that, PyTorch/XLA build CI started to fail pytorch/xla#9653. While we did fix it internally pytorch/xla#9650, I believe that PyTorch should continue installing the `fmtlib` headers, since it is a dependency of its C API [`python_arg_parser.h`][1]. PyTorch/XLA CI was moved to `unstable.yml` in #159272, and later removed in #163564. This PyTorch/XLA build failure went under the radar, since the `fmtlib` update only landed on September 22. [1]: https://github.com/pytorch/pytorch/blob/84d673ef577d42d6ec20c6c9f09863583c3111f5/torch/csrc/utils/python_arg_parser.h#L42 Pull Request resolved: #164139 Approved by: https://github.com/Skylion007, https://github.com/malfet
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SOURCE vs CURRENT_SOURCE is unreliable.
DEFINED PROJECT_NAMEis a much more portable way of determination.Also, installation shouldn't default to on if it is a subproject.