Rebuild for flang 21#10
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TL;DR: We are trying to switch our Fortran compilers on windows to flang. This is not 100% guaranteed to work, but should be fine in the majority of cases. The new LLVM-based flang has become mature enough that it should be possible to broadly switch over our Fortran compilers on windows to it (until now we only had an ancient pre-LLVM flang 5, or alternatively the GCC-based `m2w64_fortran`). As such, this PR attempts to homogenize any use of `m2w64_fortran` and other `m2w64_*` compilers to our default stack (which would then be MSVC + flang on windows), with the exception of feedstocks for R-packages, which stay on the `m2w64_` compilers. Recipes that have hard-coded expectations about the name of the fortran compiler will need to adjust to use `%FC%` or `flang` for the compiler name. Similarly, you may need to change the linker to `%FC_LD%` or use `lld-link`. It is also possible that you run into compilation errors due to differences in compiler behaviour, bugs or as-yet unimplemented features. In case of compilation errors due to stricter default language standards, you should be able to fix things by passing `-std=legacy` to `FFLAGS`. If you have problems with this PR, feel free to ping the @c-f/flang-activation team. In case you have convinced yourself that flang really is not ready yet to be used to compile a given feedstock, you may also close this migrator PR.
…2026.06.04.12.45.1
regro-cf-autotick-bot
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RobertPincus and
makepath-alex
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Hi! This is the friendly automated conda-forge-linting service. I just wanted to let you know that I linted all conda-recipes in your PR ( |
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@c-f/flang-activation The Windows/CMake/Ninja build is failing with linker errors - symbols are not found that certainly do exist within the source tree. Any advice on how to debug? |
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@conda-forge/flang-activation The Windows/CMake/Ninja build is failing with linker errors - symbols are not found that certainly do exist within the source tree. Any advice on how to debug? |
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This PR has been triggered in an effort to update flang21.
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