rust-jemalloc-sys: init

pkgs/development/libraries/jemalloc/rust.nix

···
+{ lib
+, stdenv
+, jemalloc
+, writeText
+
+, unprefixed ? false
+}:
+
+let
+  # On some platforms the unprefixed feature will be ignored:
+  # https://github.com/tikv/jemallocator/blob/ab0676d77e81268cd09b059260c75b38dbef2d51/jemalloc-sys/src/env.rs
+  unprefixed' = unprefixed && !stdenv.hostPlatform.isMusl && !stdenv.hostPlatform.isDarwin && !stdenv.hostPlatform.isAndroid;
+
+in jemalloc.overrideAttrs (oldAttrs: {
+  configureFlags = oldAttrs.configureFlags ++ [
+    "--with-private-namespace=_rjem_"
+  ] ++ lib.optionals (!unprefixed') [
+    "--with-jemalloc-prefix=_rjem_"
+  ];
+
+  setupHook = writeText "setup-hook.sh" ''
+    export JEMALLOC_OVERRIDE="@out@/lib/libjemalloc${stdenv.hostPlatform.extensions.library}"
+  '';
+})

pkgs/top-level/all-packages.nix

···
 
   jemalloc = callPackage ../development/libraries/jemalloc { };
 
+  rust-jemalloc-sys = callPackage ../development/libraries/jemalloc/rust.nix { };
+  rust-jemalloc-sys-unprefixed = rust-jemalloc-sys.override { unprefixed = true; };
+
   jose = callPackage ../development/libraries/jose { };
 
   jpcre2 = callPackage ../development/libraries/jpcre2 { };