From a1ba737c5ee13938f9d4208b2c67073caed14a2b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=B6rg=20Thalheim?= <joerg@thalheim.io>
Date: Tue, 24 May 2022 07:17:28 +0200
Subject: [PATCH] folly: enable jemalloc

Folly does take advantage of jemalloc to expand allocations in-place when possible.
---
 pkgs/development/libraries/folly/default.nix | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/pkgs/development/libraries/folly/default.nix b/pkgs/development/libraries/folly/default.nix
index c3fe3ba2ce76..e2057b873cd0 100644
--- a/pkgs/development/libraries/folly/default.nix
+++ b/pkgs/development/libraries/folly/default.nix
@@ -16,6 +16,7 @@
 , xz
 , zlib
 , zstd
+, jemalloc
 , follyMobile ? false
 }:
 
@@ -50,7 +51,10 @@ stdenv.mkDerivation rec {
     libunwind
     fmt_8
     zstd
-  ];
+  ] ++ lib.optional stdenv.isLinux jemalloc;
+
+  # jemalloc headers are required in include/folly/portability/Malloc.h
+  propagatedBuildInputs = lib.optional stdenv.isLinux jemalloc;
 
   NIX_CFLAGS_COMPILE = [ "-DFOLLY_MOBILE=${if follyMobile then "1" else "0"}" "-fpermissive" ];
   cmakeFlags = [ "-DBUILD_SHARED_LIBS=ON" ];