From 9dfbf95db02054204defbe422099c02b790a19fc Mon Sep 17 00:00:00 2001
From: Ophestra <cat@gensokyo.uk>
Date: Thu, 22 Oct 2026 01:56:23 +0900
Subject: internal/rosa: initial cross-compilation support

This successfully cross-compiles the toolchain. More work is needed to
support cross-compilation on all native helpers and existing packages.

Signed-off-by: Ophestra <cat@gensokyo.uk>
---
 internal/rosa/package/kernel/package.az |  8 ++++-
 internal/rosa/package/llvm/package.az   | 52 +++++++++++++++++++++++++++------
 internal/rosa/package/musl/package.az   | 15 ++++++++++
 3 files changed, 65 insertions(+), 10 deletions(-)

(limited to 'internal/rosa/package')

diff --git a/internal/rosa/package/kernel/package.az b/internal/rosa/package/kernel/package.az
index 47bc4323..8e2dcfe5 100644
--- a/internal/rosa/package/kernel/package.az
+++ b/internal/rosa/package/kernel/package.az
@@ -29,6 +29,12 @@ package kernel-headers {
 		make = [
 			"-f /usr/src/kernel-headers/Makefile",
 			"O=/tmp/kbuild",
+			"ARCH='"+arch {
+				default = arch;
+
+				amd64 = "x86";
+				riscv64 = "riscv";
+			}+"'",
 			"LLVM=1",
 			`HOSTLDFLAGS="${LDFLAGS:-''}"`,
 			"INSTALL_HDR_PATH=/work/system",
@@ -47,7 +53,7 @@ cat \
 
 		amd64 = "8BdskuTo4WxcJDFbdHakHmvkeIASmOkDd0LanTjaXwkmoMa5PeMf0gqee0FqYRFd";
 		arm64 = "RQ27XMgxEj5M6cagVHljCE1n-9q_gFayOaakWr0PoAq5yllfLHEz0KQx1fXLwCzp";
-		riscv64 = "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA";
+		riscv64 = "N4YuFlWVfdgnmoJMFMrTL3vhnzh-yUpxGmFaHqSuNIOmgBn2rI_SWcodONGcfOhw";
 	};
 
 	tools = [ rsync ];
diff --git a/internal/rosa/package/llvm/package.az b/internal/rosa/package/llvm/package.az
index 631228be..02cea79a 100644
--- a/internal/rosa/package/llvm/package.az
+++ b/internal/rosa/package/llvm/package.az
@@ -17,13 +17,41 @@ package llvm-project {
 	];
 }
 
+package early-builtins {
+	description = "early LLVM runtime: compiler-rt (builtins)";
+	source = llvm-project;
+
+	exclusive = true;
+
+	exec = cmake {
+		append = [ "compiler-rt/lib/builtins" ];
+		cache = {
+			"LLVM_HOST_TRIPLE": triple;
+			"LLVM_ENABLE_RTTI": "ON";
+			"LLVM_BUILD_LLVM_DYLIB": "ON";
+			"LLVM_LINK_LLVM_DYLIB": "ON";
+			"LLVM_ENABLE_PER_TARGET_RUNTIME_DIR": "ON";
+
+			"COMPILER_RT_DEFAULT_TARGET_ONLY": "ON";
+		};
+		test = nil;
+	};
+
+	tools = [ python-early ];
+
+	inputs = [
+		musl-headers,
+		kernel-headers,
+	];
+}
+
 package early-compiler-rt {
 	description = "early LLVM runtime: compiler-rt";
 	source = llvm-project;
 
 	exclusive = true;
 	early = `
-LLVM_VERSION_MAJOR="$(cmake -P /dev/stdin <<< '
+LLVM_VERSION_MAJOR="$(CLICOLOR_FORCE= cmake -P /dev/stdin <<< '
 include(cmake/Modules/LLVMVersion.cmake)
 message(NOTICE "${LLVM_VERSION_MAJOR}")
 ' 2>&1)"
@@ -36,6 +64,9 @@ message(NOTICE "${LLVM_VERSION_MAJOR}")
 			// libc++ not yet available
 			"CMAKE_CXX_COMPILER_TARGET": "";
 
+			// musl not yet available
+			"CMAKE_TRY_COMPILE_TARGET_TYPE": "STATIC_LIBRARY";
+
 			"LLVM_HOST_TRIPLE": triple;
 			"LLVM_ENABLE_RTTI": "ON";
 			"LLVM_BUILD_LLVM_DYLIB": "ON";
@@ -45,15 +76,15 @@ message(NOTICE "${LLVM_VERSION_MAJOR}")
 			"COMPILER_RT_BUILD_BUILTINS": "ON";
 			"COMPILER_RT_DEFAULT_TARGET_ONLY": "ON";
 			"COMPILER_RT_USE_BUILTINS_LIBRARY": "ON";
-			"COMPILER_RT_SANITIZERS_TO_BUILD": "asan";
-			"COMPILER_RT_BUILD_GWP_ASAN": "OFF";
 
 			// does not work without libunwind
 			"COMPILER_RT_BUILD_CTX_PROFILE": "OFF";
+			"COMPILER_RT_BUILD_SANITIZERS": "OFF";
 			"COMPILER_RT_BUILD_LIBFUZZER": "OFF";
 			"COMPILER_RT_BUILD_MEMPROF": "OFF";
 			"COMPILER_RT_BUILD_PROFILE": "OFF";
 			"COMPILER_RT_BUILD_XRAY": "OFF";
+			"COMPILER_RT_BUILD_ORC": "OFF";
 		};
 		test = nil;
 		postInstall = `
@@ -71,14 +102,14 @@ ln -s \
 `;
 	};
 
-	inputs = [
-		python-early,
+	tools = [ python-early ];
 
+	inputs = [
 		musl-headers,
 		kernel-headers,
 	];
 
-	runtime = [ musl ];
+	cross = [ early-builtins ];
 }
 
 package early-runtimes {
@@ -120,14 +151,17 @@ package early-runtimes {
 		test = nil;
 	};
 
-	inputs = [
-		python-early,
+	tools = [ python-early ];
 
+	inputs = [
 		zlib,
 		zstd,
 		early-compiler-rt,
 		kernel-headers,
 	];
 
-	runtime = [ early-compiler-rt ];
+	runtime = [
+		musl,
+		early-compiler-rt,
+	];
 }
diff --git a/internal/rosa/package/musl/package.az b/internal/rosa/package/musl/package.az
index c264c782..7afa7e2f 100644
--- a/internal/rosa/package/musl/package.az
+++ b/internal/rosa/package/musl/package.az
@@ -24,6 +24,9 @@ package musl-headers {
 
 	exec = make {
 		defaults = false;
+		configure = {
+			"target": triple;
+		};
 		make = [ "DESTDIR=/work", "install-headers" ];
 		check = nil;
 		install = "# headers installed during make";
@@ -46,9 +49,20 @@ package musl {
 	env = [
 		"LDFLAGS=" + earlyLDFLAGS,
 	];
+	early = `
+[ -e '/system/`+arch+`' ] && \
+	ln -s ../../../../`+arch+`/system/lib/`+triple+` /system/lib/clang/*/lib || true
+`;
 
 	exec = make {
 		defaults = false;
+		configure = {
+			"target": triple;
+
+			"AR": "ar";
+			"RANLIB": "ranlib";
+			"CC": "'clang --target="+triple+" -rtlib=compiler-rt'";
+		};
 		check = nil;
 		postInstall = `
 mkdir -p /work/system/bin
@@ -61,5 +75,6 @@ rmdir -v /work/lib
 `;
 	};
 
+	cross = [ early-compiler-rt ];
 	tools = [ coreutils ];
 }
-- 
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