package mrustc-source {
	description = "patched mrustc source tree";
	exclude = true;

	version# = "0.12.0";
	output = remoteGitHub {
		suffix = "thepowersgang/mrustc";
		tag = "v"+version;
		checksum = "Db25OAKL_1yZIF6MlXOTHhrEJ-Pd-i-accVtt5rJollmpKm6B3bgS0xN7hoC1cVu";
	};
	chmod = true;
	patches = [
		"0001-do-not-download-rustc.patch",
		"0002-Revert-HIR-Typecheck-Optimise-by-doing-multiple-chec.patch",
		"0003-rustc-src-enable-rustix-use-libc-feature-revert-port.patch",

		"remove-git-invocations.patch",
	];
}

package mrustc {
	description = "alternative rust compiler (re-implementation)";
	website = "https://github.com/thepowersgang/mrustc";
	anitya = 391250;

	source = mrustc-source;
	enterSource = true;
	writable = true;

	minimal = true;
	exec = make {
		inPlace = true;
		skipConfigure = true;
		make = [ "CXX='g++ -w'" ];
		// test suite runs during rustc-bootstrap
		skipCheck = true;
		install = "install -vD bin/mrustc /work/system/bin/mrustc";
	};

	inputs = [
		bash,

		// mrustc requires buggy gcc behaviour
		gcc,
	];

	runtime = [ gcc ];
}

package rustc-bootstrap-source {
	description = "unpatched bootstrap rust toolchain source tree";
	exclude = true;

	version# = "1.90.0";
	output = remoteTar {
		url = "https://static.rust-lang.org/dist/rustc-"+version+"-src.tar.gz";
		compress = gzip;
		checksum = "kUjk5mOHRc7cTom0uJ5afFTkhFcXLYK8tJl_aqduffGSHc0TH_a-KKz6PI0nk_xK";
	};
	chmod = true;
}

package rustc-bootstrap-llvm {
	description = "bootstrap rustc-standalone LLVM build";
	exclude = true;

	source = rustc-bootstrap-source;
	exec = cmake {
		append = [ "src", "llvm-project", "llvm" ];

		// Reference $(RUSTCSRC)src/bootstrap/native.rs for these values
		cache = {
			"CMAKE_C_COMPILER": "gcc";
			"CMAKE_C_FLAGS": "-w";
			"CMAKE_CXX_COMPILER": "g++";
			"CMAKE_CXX_FLAGS": "-w";
			"LLVM_LINK_LLVM_DYLIB": "OFF";
			"LLVM_TARGETS_TO_BUILD": "'X86;ARM;AArch64'";
			"LLVM_ENABLE_ASSERTIONS": "OFF";
			"LLVM_INCLUDE_EXAMPLES": "OFF";
			"LLVM_INCLUDE_TESTS": "OFF";
			"LLVM_INCLUDE_DOCS": "OFF";
			"LLVM_INCLUDE_BENCHMARKS": "OFF";
			"LLVM_ENABLE_ZLIB": "OFF";
			"LLVM_ENABLE_TERMINFO": "OFF";
			"LLVM_ENABLE_LIBEDIT": "OFF";
			"WITH_POLLY": "OFF";
			"LIBUNWIND_ENABLE_SHARED": "OFF";
		};
		skipTest = true;
	};

	inputs = [
		python-early,

		gcc,
		kernel-headers,
	];
}

package rustc-mrustc {
	description = "initial rustc stage compiled by mrustc";
	exclude = true;

	source = rustc-bootstrap-source;
	extra = [
		mrustc-source,
		rustc-bootstrap-llvm,
	];

	writable = true;
	early = "cd ../extra/mrustc-source";
	minimal = true;

	exec = make {
		inPlace = true;
		skipConfigure = true;
		preMake = `
LLVM='../rustc-bootstrap-llvm/system/bin/llvm-config'
RUSTC_SOURCE='../../rustc-mrustc'

export CC=gcc CXX=g++
export PARLEVEL=`+jobsE+`
export RUSTC_TARGET="$(uname -m)-unknown-linux-musl"
export RUSTC_VERSION="$(cut -d ' ' -f 1 "$RUSTC_SOURCE/version")"
export MRUSTC_TARGET_VER="$(cut -d '.' -f 1,2 <<< "$RUSTC_VERSION")"
export OUTDIR_SUF="-$RUSTC_VERSION"

patch -d "$RUSTC_SOURCE" -p0 < "rustc-$RUSTC_VERSION-src.patch"
touch "$RUSTC_SOURCE/dl-version"

ln -s "$RUSTC_SOURCE" "rustc-$RUSTC_VERSION-src"
mkdir bin && ln -s /system/bin/mrustc bin/
ln -sf gcc /system/bin/cc
ln -sf g++ /system/bin/c++
`;
		make = [
			"-f",
			"minicargo.mk",
			"CXX='g++ -w'",
			`LLVM_CONFIG="$LLVM"`,
			"LIBS",
		];
		check = [
			"CXX='g++ -w'",
			// run this first to avoid intermittent failures
			"local_tests",
		];

		install = `
make \
	`+jobsFlagE+` \
	`+loadFlagE+` \
	CXX='g++ -w' \
	test

OUTDIR="output-$RUSTC_VERSION"
make -f minicargo.mk LLVM_CONFIG="$LLVM" "$OUTDIR/rustc"
make -f minicargo.mk LLVM_CONFIG="$LLVM" "$OUTDIR/cargo"
mkdir -p /work/system/bin/
(set -o braceexpand && cp "$OUTDIR"/{rustc,cargo} bin/minicargo /work/system/bin/)
`;
	};

	inputs = [
		bash,
		perl,
		patch,
		mrustc,
		llvm,
	];

	runtime = [ gcc, llvm, mrustc ];
}

package rustc-bootstrap {
	description = "early rustc bootstrapped by rustc-mrustc";
	exclude = true;

	source = rustc-bootstrap-source;
	extra = [ mrustc-source ];
	files = {
		"b00-link-self-contained.patch";
	};

	writable = true;
	early = "cd ../extra/mrustc-source";
	minimal = true;

	exec = make {
		inPlace = true;
		skipConfigure = true;
		preMake = `
RUSTC_SOURCE='../../rustc-bootstrap'

export RUSTC_TARGET="$(uname -m)-unknown-linux-musl"
export RUSTC_VERSION="$(cut -d ' ' -f 1 "$RUSTC_SOURCE/version")"

patch -d "$RUSTC_SOURCE" -p0 < "rustc-$RUSTC_VERSION-src.patch"
cat /usr/src/*.patch | patch -p1

ln -s "$RUSTC_SOURCE" "rustc-$RUSTC_VERSION-src"
mkdir bin "output-$RUSTC_VERSION"
(set -o braceexpand && \
	ln -s /system/bin/{mrustc,minicargo} bin/ && \
	ln -s /system/bin/{rustc,cargo} "output-$RUSTC_VERSION")
ln -sf gcc /system/bin/cc
ln -sf g++ /system/bin/c++
`;
		make = [
			"-C", "run_rustc",
			"CC=gcc",
			"PARLEVEL="+jobsE,
		];
	};

	inputs = [
		bash,
		patch,

		rustc-mrustc,
	];
}