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Fix Nix for MacOS #177

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Merged
codedmart merged 2 commits into from
Mar 12, 2026
Merged

Fix Nix for MacOS #177

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6652bb7
Fix Nix for MacOS
danieljharvey Jul 29, 2025
1f0c52b
Merge branch 'main' into djh/fix-nix-on-darwin
codedmart Mar 12, 2026
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20 changes: 11 additions & 9 deletions nix/cargo-boilerplate.nix
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Original file line number Diff line number Diff line change
Expand Up @@ -45,36 +45,38 @@ let
# Ideally we would pass in a crossSystem argument of the form
# "aarch64-unknown-linux-musl" instead of doing this fixup. But that doesn't
# seem to work.
buildTarget =
buildTargetName =
if staticallyLinked then builtins.replaceStrings [ "gnu" ] [ "musl" ] hostPlatform.config
else hostPlatform.config;

# nixpkgs decided to change the name of the darwin targets
buildTargetNameFixed =
if buildTargetName == "arm64-apple-darwin"
then "aarch64-apple-darwin"
else buildTargetName;

# Make sure the Rust toolchain includes support for the platform we are
# building for in case we are cross-compiling. In practice this is only
# necessary if we are statically linking, and therefore have a `musl` target.
# But it doesn't hurt anything to make this override in other cases.
toolchain = pkgs: pkgs.rustToolchain.override { targets = [ buildTarget ]; };
toolchain = pkgs: pkgs.rustToolchain.override { targets = [ buildTargetNameFixed ]; };

# Converts host system string for use in environment variable names
envCase = triple: lib.strings.toUpper (builtins.replaceStrings [ "-" ] [ "_" ] triple);
in
{
buildArgs = {
# buildInputs are compiled for the target platform that we are compiling for
buildInputs = lib.optionals hostPlatform.isDarwin [
darwin.apple_sdk.frameworks.CoreServices # needed to run mongodb-connector unit tests
pkgsStatic.darwin.apple_sdk.frameworks.Security
pkgsStatic.darwin.apple_sdk.frameworks.SystemConfiguration
];
buildInputs = lib.optionals hostPlatform.isDarwin [];

# nativeBuildInputs are intended to run on the platform we are building on,
# as opposed to the platform we are targetting for compilation
nativeBuildInputs = lib.optionals buildPlatform.isDarwin [
libiconv
];

CARGO_BUILD_TARGET = buildTarget;
"CARGO_TARGET_${envCase buildTarget}_LINKER" = "${stdenv.cc.targetPrefix}cc";
CARGO_BUILD_TARGET = buildTargetNameFixed;
"CARGO_TARGET_${envCase buildTargetNameFixed}_LINKER" = "${stdenv.cc.targetPrefix}cc";

# This environment variable may be necessary if any of your dependencies use
# a build-script which invokes the `cc` crate to build some other code. The
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