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base repository: NixOS/nixpkgs
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  • 2 commits
  • 1 file changed
  • 2 contributors

Commits on Apr 17, 2018

  1. impureUseNativeOptimizations: add stdenv adapter 

    This allows one to force a compiler to use native machine optimizations. This
goes contrary to all the usual guarantees of Nix and so should be used only by
end-user and only in specific cases when they know what are they doing.

In my case this is needed to get a noticeable FPS boost in RPCS3 which is very
CPU-hungry PlayStation 3 emulator.
    @abbradar
    abbradar committed Apr 17, 2018

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    This commit was signed with the committer’s verified signature.
    elseym Simon Waibl
    GPG key ID: 8696D1F9E5C020D2
    Verified
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    15bfee8 View commit details

Commits on Oct 13, 2018

  1. Merge pull request #37600 from abbradar/impureusenative 

    impureUseNativeOptimizations: add stdenv adapter
    @lukateras
    lukateras authored Oct 13, 2018
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    cd0c873 View commit details
Showing with 15 additions and 0 deletions.
  1. +15 −0 pkgs/stdenv/adapters.nix
15 changes: 15 additions & 0 deletions pkgs/stdenv/adapters.nix
View file
Original file line number Diff line number Diff line change
@@ -171,4 +171,19 @@ rec {
NIX_CFLAGS_LINK = toString (args.NIX_CFLAGS_LINK or "") + " -fuse-ld=gold";
});
};


/* Modify a stdenv so that it builds binaries optimized specifically
for the machine they are built on.
WARNING: this breaks purity! */
impureUseNativeOptimizations = stdenv: stdenv //
{ mkDerivation = args: stdenv.mkDerivation (args // {
NIX_CFLAGS_COMPILE = toString (args.NIX_CFLAGS_COMPILE or "") + " -march=native";
NIX_ENFORCE_NO_NATIVE = false;

preferLocalBuild = true;
allowSubstitutes = false;
});
};
}