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/llvm/package.az | 52 +++++++++++++++++++++++++++++------
 1 file changed, 43 insertions(+), 9 deletions(-)

(limited to 'internal/rosa/package/llvm')

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,
+	];
 }
-- 
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