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impureUseNativeOptimizations: add stdenv adapter

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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.
This commit is contained in:
Nikolay Amiantov 2018-03-22 01:22:05 +03:00
parent b1b4c6c4eb
commit 15bfee85f3
1 changed files with 15 additions and 0 deletions
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15
pkgs/stdenv/adapters.nix
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@ -210,4 +210,19 @@ 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;
});
};
}