From d1c08981f676d9205080ffec5cba364257b50aa0 Mon Sep 17 00:00:00 2001
From: John Ericson <John.Ericson@Obsidian.Systems>
Date: Wed, 29 Sep 2021 21:18:21 -0400
Subject: [PATCH] newlib: Add parameter for "nano" variant

---
 pkgs/development/misc/newlib/default.nix | 22 +++++++++++++++++++---
 1 file changed, 19 insertions(+), 3 deletions(-)

diff --git a/pkgs/development/misc/newlib/default.nix b/pkgs/development/misc/newlib/default.nix
index 193ec53d5ad..93c50ea3cc5 100644
--- a/pkgs/development/misc/newlib/default.nix
+++ b/pkgs/development/misc/newlib/default.nix
@@ -1,4 +1,9 @@
-{ stdenv, fetchurl, buildPackages }:
+{ stdenv, fetchurl, buildPackages
+, # "newlib-nano" is what the official ARM embedded toolchain calls this build
+  # configuration that prioritizes low space usage. We include it as a preset
+  # for embedded projects striving for a similar configuration.
+  nanoizeNewlib ? false
+}:
 
 let version = "3.3.0";
 in stdenv.mkDerivation {
@@ -22,10 +27,21 @@ in stdenv.mkDerivation {
 
     "--disable-newlib-supplied-syscalls"
     "--disable-nls"
+    "--enable-newlib-retargetable-locking"
+  ] ++ (if !nanoizeNewlib then [
     "--enable-newlib-io-long-long"
     "--enable-newlib-register-fini"
-    "--enable-newlib-retargetable-locking"
-  ];
+  ] else [
+    "--enable-newlib-reent-small"
+    "--disable-newlib-fvwrite-in-streamio"
+    "--disable-newlib-fseek-optimization"
+    "--disable-newlib-wide-orient"
+    "--enable-newlib-nano-malloc"
+    "--disable-newlib-unbuf-stream-opt"
+    "--enable-lite-exit"
+    "--enable-newlib-global-atexit"
+    "--enable-newlib-nano-formatted-io"
+  ]);
 
   dontDisableStatic = true;