mrustc: init

This contains some extraordinarily ugly hacks for a set of even uglier
Makefiles.

Signed-off-by: Ophestra <cat@gensokyo.uk>

mrustc/0001-do-not-download-rustc.patch

@@ -1,7 +1,7 @@
 From 157772049aa7da13533026292cb4f67c1e8bf542 Mon Sep 17 00:00:00 2001
 From: nobody <nobody@localhost>
 Date: Sun, 19 Jul 2026 06:21:49 +0900
-Subject: [PATCH 1/3] do not download rustc
+Subject: [PATCH 1/2] do not download rustc
 
 The $(RUSTC_SRC_DL) file already exists, but for some reason Make wants
 to rebuild this target when it has $(RUSTC_SRC_TARBALL) as a dependency.

mrustc/0002-Revert-HIR-Typecheck-Optimise-by-doing-multiple-chec.patch

@@ -1,7 +1,7 @@
 From 6e66feb3b6ae698c3d29211847c71c00f87fbf78 Mon Sep 17 00:00:00 2001
 From: nobody <nobody@localhost>
 Date: Sun, 19 Jul 2026 06:23:12 +0900
-Subject: [PATCH 2/3] Revert "HIR Typecheck - Optimise by doing multiple checks
+Subject: [PATCH 2/2] Revert "HIR Typecheck - Optimise by doing multiple checks
  per pass"
 
 This reverts commit 99d9bd0c788b0c72fc2f4fee6187a462ceb059f2.

mrustc/b00-link-self-contained.patch

@@ -1,54 +0,0 @@
-diff --git a/run_rustc/Makefile b/run_rustc/Makefile
-index e78d8c51..cc9f785e 100644
---- a/run_rustc/Makefile
-+++ b/run_rustc/Makefile
-@@ -150,14 +150,23 @@ $(CARGO_HOME)config: Makefile
- 	$Vecho "[source.vendored-sources]" >> $@
- 	$Vecho "directory = \"$(abspath $(VENDOR_DIR))\"" >> $@
- 
-+self-contained:
-+	mkdir -p $@
-+	(set -o braceexpand && ln -s \
-+		/system/lib/{'rcrt1.o','crti.o','crtn.o'} \
-+		/system/lib/gcc/"$(ROSA_TRIPLE)"/"$(shell gcc -dumpfullversion)"/{'crtbeginS.o','crtendS.o'} \
-+		/system/lib/"$(ROSA_TRIPLE)"/* \
-+		$@)
-+
- # -------------------------------------
- # Stage 1: Build standard library (using minicargo with rustc)
- # - Can't use `cargo` because there isn't a rustc-compatible std yet
- # - _could_ use it if mrustc accepted all the arguments rustc does (via the proxy)
- # -------------------------------------
--$(LIBDIR_S)libstd.rlib: $(BINDIR_S)rustc $(MINICARGO) Makefile
-+$(LIBDIR_S)libstd.rlib: self-contained $(BINDIR_S)rustc $(MINICARGO) Makefile
- 	@echo "[MINICARGO] $(RUST_SRC_LIBS)std > $(LIBDIR_S)"
--	mkdir -p $(LIBDIR_S)
-+	@mkdir -p $(LIBDIR_S)
-+	@ln -sf ../../../../../../self-contained $(LIBDIR_S)
- ifneq ($(TARGETVER_LEAST_1_74),)
- 	$V+STD_ENV_ARCH=$(RUSTC_ARCH) MRUSTC_PATH=$(abspath $(BINDIR_S)rustc) $(MINICARGO) --vendor-dir $(VENDOR_DIR) --script-overrides ../script-overrides/stable-$(RUSTC_VERSION)-$(PLATFORM)/ --output-dir $(LIBDIR_S) $(RUST_SRC_LIBS)sysroot
- else
-@@ -178,6 +187,7 @@ CARGO_OUTDIR_STAGE2_STD := $(OUTDIR)build-std2/$(RUSTC_TARGET)/release/
- CARGO_ENV_STAGE2_STD := CARGO_TARGET_DIR=$(OUTDIR)build-std2 RUSTC=$(abspath rustc_proxy.sh) PROXY_RUSTC=$(abspath $(BINDIR_2)rustc) PROXY_MRUSTC=$(abspath $(BINDIR_S)rustc) $(CARGO_ENV)
- $(LIBDIR_2)libtest.rlib: $(LIBDIR_S)libstd.rlib $(BINDIR_2)rustc $(BINDIR_S)rustc $(BINDIR_S)cargo $(CARGO_HOME)config Makefile
- 	@mkdir -p $(LIBDIR_2)
-+	@ln -sf ../../../../../../self-contained $(LIBDIR_2)
- 	@echo [CARGO] $(RUST_SRC_LIBS)test/Cargo.toml '>' $(OUTDIR)build-std2
- ifneq ($(TARGETVER_LEAST_1_74),)
- 	$V$(CARGO_ENV_STAGE2_STD) $(BINDIR_S)cargo build $(CARGO_FLAGS) --manifest-path $(RUST_SRC_LIBS)sysroot/Cargo.toml --features panic-unwind
-@@ -215,6 +225,7 @@ else
- 	@echo "[CP] libraries and results ($@)"
- endif
- 	@mkdir -p $(LIBDIR)
-+	@ln -sf ../../../../../../self-contained $(LIBDIR)
- 	$Vcp $(LIBDIR_2)*.$(DYLIB_EXT) $(PREFIX)lib
- 	$Vcp $(CARGO_OUTDIR_RUSTC)deps/*.rlib $(LIBDIR)
- 	$Vcp $(CARGO_OUTDIR_RUSTC)deps/*.$(DYLIB_EXT) $(LIBDIR)
-@@ -243,6 +254,7 @@ CARGO_OUTDIR_STAGE3_STD := $(OUTDIR)build-std/$(RUSTC_TARGET)/release/
- CARGO_ENV_STAGE3_STD := CARGO_TARGET_DIR=$(OUTDIR)build-std RUSTC=$(abspath rustc_proxy.sh) PROXY_RUSTC=$(abspath $(BINDIR)rustc) PROXY_MRUSTC=$(abspath $(BINDIR_2)rustc) $(CARGO_ENV)
- $(LIBDIR)libstd.rlib: $(BINDIR)rustc
- 	@mkdir -p $(LIBDIR)
-+	@ln -sf ../../../../../../self-contained $(LIBDIR)
- 	@echo [CARGO] $(RUST_SRC_LIBS)test/Cargo.toml '>' $(OUTDIR)build-std2
- ifneq ($(TARGETVER_LEAST_1_74),)
- 	$V$(CARGO_ENV_STAGE3_STD) $(BINDIR_S)cargo build $(CARGO_FLAGS) --manifest-path $(RUST_SRC_LIBS)sysroot/Cargo.toml --features panic-unwind

mrustc/package.az

@@ -1,54 +1,5 @@
-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";
+	description = "rustc source tree used by mrustc";
 	exclude = true;
 
 	version# = "1.90.0";
@@ -60,164 +11,72 @@ package rustc-bootstrap-source {
 	chmod = true;
 }
 
-package rustc-bootstrap-llvm {
-	description = "bootstrap rustc-standalone LLVM build";
-	exclude = true;
+package mrustc {
+	description = "alternative rust compiler (re-implementation)";
+	website = "https://github.com/thepowersgang/mrustc";
+	anitya = 391250;
 
-	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";
+	version# = "0.12.0";
+	source = remoteGitHub {
+		suffix = "thepowersgang/mrustc";
+		tag = "v"+version;
+		checksum = "Db25OAKL_1yZIF6MlXOTHhrEJ-Pd-i-accVtt5rJollmpKm6B3bgS0xN7hoC1cVu";
 	};
-		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,
+	patches = [
+		"0001-do-not-download-rustc.patch",
+		"0002-Revert-HIR-Typecheck-Optimise-by-doing-multiple-chec.patch",
 	];
+	extra = [ rustc-bootstrap-source ];
 
+	enterSource = true;
 	writable = true;
-	early = "cd ../extra/mrustc-source";
-	minimal = true;
+	chmod = 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="$(uname -m)-unknown-linux-musl"
+export RUSTC_SOURCE='../extra/rustc-bootstrap-source'
 export RUSTC_VERSION="$(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++
+
+sed -i 's/\$(shell git show --pretty=%H -s --no-show-signature)/unknown/' Makefile
+sed -i 's/\$(shell git show -s --pretty=%h --no-show-signature)/unknown/' Makefile
+sed -i 's/\$(shell git symbolic-ref -q --short HEAD || git describe --tags --exact-match)/v`+version+`/' Makefile
+sed -i 's/\$(shell git diff-index --quiet HEAD; echo $$?)/0/' Makefile
+sed -i 's/\$(shell env LC_TIME=C date -u +"%a, %e %b %Y %T +0000")/Thu,  1 Jan 1970 00:00:00 +0000/' Makefile
 `;
-		make = [
-			"-f",
-			"minicargo.mk",
-			"CXX='g++ -w'",
-			`LLVM_CONFIG="$LLVM"`,
-			"LIBS",
-		];
-		check = [
-			"CXX='g++ -w'",
-			// run this first to avoid intermittent failures
-			"local_tests",
-		];
+		preCheck = `
+make -f minicargo.mk LIBS
+make local_tests
+`;
+		check = [ "test" ];
 
 		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/)
+make -f minicargo.mk "$OUTDIR/rustc"
+make -f minicargo.mk "$OUTDIR/cargo"
+make -C run_rustc
 `;
 	};
 
 	inputs = [
 		bash,
+		patch,
+		cmake,
+		pkg-config,
 		perl,
-		patch,
-		mrustc,
-		llvm,
-	];
+		python,
 
-	runtime = [ gcc, llvm, mrustc ];
-}
+		// mrustc requires buggy gcc behaviour
+		gcc,
 
-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,
+		kernel-headers,
 	];
 }

mrustc/remove-git-invocations.patch

@@ -1,13 +0,0 @@
-diff --git a/Makefile b/Makefile
-index bb8e64a4..6bc951a7 100644
---- a/Makefile
-+++ b/Makefile
-@@ -188,7 +188,7 @@ $(OBJDIR)%.o: src/%.cpp
- $(OBJDIR)version.o: $(OBJDIR)%.o: src/%.cpp $(filter-out $(OBJDIR)version.o,$(OBJ)) Makefile
- 	@+mkdir -p $(dir $@)
- 	@echo [CXX] -o $@
--	$V$(CXX) -o $@ -c $< $(CXXFLAGS) $(CPPFLAGS) -MMD -MP -MF $@.dep -D VERSION_GIT_FULLHASH=\"$(shell git show --pretty=%H -s --no-show-signature)\" -D VERSION_GIT_BRANCH="\"$(shell git symbolic-ref -q --short HEAD || git describe --tags --exact-match)\"" -D VERSION_GIT_SHORTHASH=\"$(shell git show -s --pretty=%h --no-show-signature)\" -D VERSION_BUILDTIME="\"$(shell env LC_TIME=C date -u +"%a, %e %b %Y %T +0000")\"" -D VERSION_GIT_ISDIRTY=$(shell git diff-index --quiet HEAD; echo $$?)
-+	$V$(CXX) -o $@ -c $< $(CXXFLAGS) $(CPPFLAGS) -MMD -MP -MF $@.dep -D VERSION_GIT_FULLHASH=\"unknown\" -D VERSION_GIT_BRANCH="\"v0.12.0\"" -D VERSION_GIT_SHORTHASH=\"unknown\" -D VERSION_BUILDTIME="\"Nya,  0 Jan -1 25:71:99 +2928\"" -D VERSION_GIT_ISDIRTY=0
- 
- src/main.cpp: $(PCHS:%=src/%.gch)
-