Slotted LLVM ebuilds #3717
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Slotted LLVM ebuilds #3717
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Pull Request assignment Areas affected: ebuilds, eclasses, profiles app-vim/llvm-vim: @gentoo/proxy-maint (new package) |
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So, good news everyone.
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Introduce a slotted variant of compiler-rt libraries with the slot matching the clang version. This will make it possible to install a new compiler-rt version before upgrading clang to the corresponding version, therefore preserving a working compiler through (even minor) clang upgrades. The alternative was to replace the complete version number with the major version in the runtime directory path. However, software (e.g. Mesa) hardcodes the default path and therefore breaks when it is changed.
Allow any newer version of libcxx & libomp since both those libraries are not slotted.
Support slotted LLVM versions correctly. Allow any version for 9999, limit to <5 for 17.0.0_rc2 as current git does not work anymore. For the older 13.0.4 branch, just force slot :0 since it does not support 4.0 (the oldest slotted version).
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The idea is rather simple. LLVM & clang packages are slotted, and are installed in
/usr/lib/llvm/${SLOT}prefix. All bindirs are added to PATH via env.d in reverse version order, so newest LLVM is always preferred. An eclass will be provided to make it possible to easily use specific version in revdeps.