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| Ihar Hrachyshka | for firefox (darwin) I need a llvmPackage_20 flavor of rust (rustc, cargo...). Here is what I have: https://github.com/NixOS/nixpkgs/pull/457369/commits/ba137568714c20347f22038516307906a5da7bce it works but doesn't look pretty. Is there an easier / better way to get pure 20 stack? | 16:32:08 |
| Ihar Hrachyshka | (not sure I need all of these overrides, but definitely some are needed, otherwise I have rustc referring to both 20 and 21 and LTO builds failing due to mixed versions) | 16:33:15 |
 emily | the Rust derivation could probably rely on splicing instead of pkgsFooBar for those, but is there no way to turn off optimization flags or such to fix the LLVM 21 miscompilation instead? | 16:51:25 |
| emily | or if the cause of the miscompilation is known we could revert the commit as a patch? | 16:51:39 |
| Ihar Hrachyshka | oh but I mean I want to enable LTO :) this is in the way. otherwise it compiles fine. | 16:55:07 |
| Ihar Hrachyshka | as-is firefox is "fine" - as in it compiles and works. only when LTO is enabled, the linker can't find some symbols for reasons. that's where I figured it's because llvm versions mixed for parts of the build - confirmed by looking at the tree of deps and the fix. | 16:56:49 |
| Ihar Hrachyshka | (the reason why we need llvm 20 has nothing to do with LTO per se - we found a bug in llvm 21 with firefox on aarch64-darwin and had to revert to 20 for now) | 16:59:16 |
| Ihar Hrachyshka | * (the reason why we need llvm 20 has nothing to do with LTO per se - we found a bug in llvm 21 with firefox on aarch64-darwin and had to revert to 20 for now) | 17:01:41 |
