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[HACK] flake/packages: Enable almost-static builds on Darwin/macOS

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Zhaofeng Li 2024-11-09 16:45:04 -07:00
parent e0b2771d9a
commit 9d387c01db
1 changed files with 72 additions and 3 deletions
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75
flake/packages.nix
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@ -90,6 +90,54 @@ in
echo "exit 99" >tests/functional/gc-non-blocking.sh
'';
});
# HACK to enable almost-static builds on macOS/Darwin
#
# Currently on macOS, pkgsStatic uses the same Rust target
# as the regular platform (e.g., aarch64-apple-darwin).
#
# In `pkgs/build-support/rust/lib/default.nix`, the following
# environment variables are forced:
#
# - CC_AARCH64_APPLE_DARWIN=${ccForHost} (static cc)
# - CXX_AARCH64_APPLE_DARWIN=${cxxForHost} (static cxx)
# - CC_AARCH64_APPLE_DARWIN=${ccForBuild} (regular cc - incorrect)
# - CXX_AARCH64_APPLE_DARWIN=${cxxForBuild} (regular cxx - incorrect)
#
# As a result, the correct static CC/CXX variables are clobbered.
darwinStaticRustPlatform = let
inherit (pkgsStatic) stdenv rustPlatform;
stdenv' = stdenv.override {
buildPlatform = stdenv.buildPlatform // {
rust = stdenv.buildPlatform.rust // {
cargoEnvVarTarget = stdenv.hostPlatform.rust.cargoEnvVarTarget + "_BUILD";
};
};
};
rustLib' = import (pkgs.path + "/pkgs/build-support/rust/lib") {
stdenv = stdenv';
inherit (pkgsStatic)
lib pkgsBuildHost pkgsBuildTarget pkgsTargetTarget;
};
rust' = pkgsStatic.rust // {
inherit (rustLib') envVars;
};
hooks' = pkgsStatic.buildPackages.callPackages (pkgs.path + "/pkgs/build-support/rust/hooks") {
rust = rust';
};
rustPlatform' = rustPlatform // hooks' // {
buildRustPackage = rustPlatform.buildRustPackage.override {
inherit (hooks')
cargoBuildHook cargoCheckHook cargoInstallHook cargoNextestHook cargoSetupHook;
};
};
in rustPlatform';
in (lib.mkMerge [
{
_module.args.cranePkgs = makeCranePkgs pkgs;
@ -157,19 +205,40 @@ in
{
packages = {
# TODO: Make this work with Crane
attic-static = (pkgsStatic.callPackage ../package.nix {
nix = nix-static;
}).overrideAttrs (old: {
attic-static = let
inputOverrides = {
nix = nix-static;
} // lib.optionalAttrs isDarwin {
rustPlatform = darwinStaticRustPlatform;
};
in (pkgsStatic.callPackage ../package.nix inputOverrides).overrideAttrs (old: {
nativeBuildInputs = (old.nativeBuildInputs or []) ++ [
pkgs.nukeReferences
];
preBuild = (old.preBuild or "")
# HACK for Darwin/macOS:
#
# The other half of the mess (see darwinStaticRustPlatform above).
# Logic of cc-rs:
# - getenv_with_target_prefixes()
# - get_is_cross_compile() -> false
# - therefore, kind = "HOST"
# - tries "$CXX_aarch64_apple_darwin" (lowercase) -> not set
# - tries "$HOST_CXX" -> set to the incorrect CXX
+ lib.optionalString isDarwin ''
export CXX_${lib.toLower pkgsStatic.stdenv.hostPlatform.rust.cargoEnvVarTarget}="$CXX"
'';
# Read by pkg_config crate (do some autodetection in build.rs?)
PKG_CONFIG_ALL_STATIC = "1";
"NIX_CFLAGS_LINK_${pkgsStatic.stdenv.cc.suffixSalt}" = "-lc";
RUSTFLAGS = "-C relocation-model=static";
NIX_LDFLAGS = (old.NIX_LDFLAGS or "")
+ lib.optionalString isDarwin " -framework CoreFoundation -framework SystemConfiguration";
postFixup = (old.postFixup or "") + ''
rm -f $out/nix-support/propagated-build-inputs
nuke-refs $out/bin/attic