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cc-wrapper: Default-disable AltiVec with powerpc64-linux LLVM (#542358)

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John Ericson
2026-09-28 16:25:30 +00:00
committed by GitHub
parent 7b47c61b61 57f55719d4
commit bef5682420
1 changed files with 9 additions and 1 deletions
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10
pkgs/build-support/cc-wrapper/default.nix
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@@ -370,7 +370,15 @@ let
# Aarch64 uses TLSDESC by default and the option is completely ignored (at least on LLVM).
# TODO: Enable by default in GCC via --with-tls since https://gcc.gnu.org/cgit/gcc/commit/?id=96a291c4bb0b8a00b0a125e6a60f60072ffe53a7 (GCC 16).
# No equivalent build-time option for LLVM yet.
++ optional (tlsDialect != null) "-mtls-dialect=${tlsDialect}";
++ optional (tlsDialect != null) "-mtls-dialect=${tlsDialect}"
# LLVM default-enables AltiVec for powerpc64, and for many CPU targets that didn't actually have it.
# https://github.com/llvm/llvm-project/blob/40977001fcb190a509897aee592819cdd7e83740/llvm/lib/Target/PowerPC/PPC.td#L791-L796
# GCC is more conservative: Requires selecting POWER7 or higher for auto-enable, or opting into it on older ones.
# If no CPU is specified, disable AltiVec like GCC does.
# TODO: Specify CPU + AltiVec preference?
++ optional (
(targetPlatform.isPower64 && targetPlatform.isBigEndian) && isClang && !(targetPlatform ? gcc.cpu)
) "-mno-altivec";
defaultHardeningFlags = bintools.defaultHardeningFlags or [ ];