allow to enable/disable standard library C++ modules in LLVM easyblock #3994
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(created using
eb --new-pr)While LLVM always builds the standard library C++ modules, they are not installed by default for all versions. Marked as experimental (at least for LLVM 18 -- LLVM 20), the installation is only enabled by default in LLVM 20 and newer.
To still give users control about building the modules, add a configuration option. The default relies on the value set by LLVM.