Merge pull request #140055 from obsidiansystems/newlib-nano

newlib: Add parameter for "nano" variant

pkgs/development/misc/newlib/default.nix

···
-{ 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
+}:
 
 stdenv.mkDerivation rec {
   pname = "newlib";
···
 
     "--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;
 

pkgs/top-level/all-packages.nix

···
     else if name == "newlib" && stdenv.targetPlatform.isVc4 then targetPackages.vc4-newlib or vc4-newlib
     else if name == "newlib" && stdenv.targetPlatform.isOr1k then targetPackages.or1k-newlib or or1k-newlib
     else if name == "newlib" then targetPackages.newlibCross or newlibCross
+    else if name == "newlib-nano" then targetPackages.newlib-nanoCross or newlib-nanoCross
     else if name == "musl" then targetPackages.muslCross or muslCross
     else if name == "msvcrt" then targetPackages.windows.mingw_w64 or windows.mingw_w64
     else if name == "libSystem" then
···
   newlib = callPackage ../development/misc/newlib { };
   newlibCross = callPackage ../development/misc/newlib {
     stdenv = crossLibcStdenv;
-    };
+  };
+
+  newlib-nano = callPackage ../development/misc/newlib {
+    nanoizeNewlib = true;
+  };
+  newlib-nanoCross = callPackage ../development/misc/newlib {
+    nanoizeNewlib = true;
+    stdenv = crossLibcStdenv;
+  };
 
   omnisharp-roslyn = callPackage ../development/tools/omnisharp-roslyn { dotnet-sdk = dotnet-sdk_5; };