From 8d2b8d0da3814e7cec25fb31292e4ade6981cb7d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=B6rg=20Thalheim?= <joerg@thalheim.io>
Date: Wed, 11 May 2022 15:47:03 +0200
Subject: [PATCH] nearcore: switch to fat lto

---
 pkgs/applications/blockchains/nearcore/default.nix | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/pkgs/applications/blockchains/nearcore/default.nix b/pkgs/applications/blockchains/nearcore/default.nix
index 09d4546356c..a5f9368b377 100644
--- a/pkgs/applications/blockchains/nearcore/default.nix
+++ b/pkgs/applications/blockchains/nearcore/default.nix
@@ -23,7 +23,7 @@ rustPlatform.buildRustPackage rec {
   '';
 
   CARGO_PROFILE_RELEASE_CODEGEN_UNITS = "1";
-  CARGO_PROFILE_RELEASE_LTO = "thin";
+  CARGO_PROFILE_RELEASE_LTO = "fat";
   NEAR_RELEASE_BUILD = "release";
 
   OPENSSL_NO_VENDOR = 1; # we want to link to OpenSSL provided by Nix
@@ -42,6 +42,9 @@ rustPlatform.buildRustPackage rec {
     protobuf
   ];
 
+  # fat LTO requires ~3.4GB RAM
+  requiredSystemFeatures = [ "big-parallel" ];
+
   LIBCLANG_PATH = "${llvmPackages.libclang.lib}/lib";
   BINDGEN_EXTRA_CLANG_ARGS = "-isystem ${llvmPackages.libclang.lib}/lib/clang/${lib.getVersion llvmPackages.clang}/include";