From a720efc32d67a56d781da92ba0107d696ee98477 Mon Sep 17 00:00:00 2001
From: Ophestra <cat@gensokyo.uk>
Date: Sun, 15 Mar 2026 15:06:36 +0900
Subject: [PATCH] internal/rosa/llvm: arch-specific versions

This enables temporarily avoiding a broken release on specific targets.

Signed-off-by: Ophestra <cat@gensokyo.uk>
---
 internal/rosa/llvm.go        |  8 +-------
 internal/rosa/llvm_arm64.go  |  8 ++++++++
 internal/rosa/llvm_latest.go | 11 +++++++++++
 3 files changed, 20 insertions(+), 7 deletions(-)
 create mode 100644 internal/rosa/llvm_latest.go

diff --git a/internal/rosa/llvm.go b/internal/rosa/llvm.go
index 2ce55fe..b654d20 100644
--- a/internal/rosa/llvm.go
+++ b/internal/rosa/llvm.go
@@ -73,14 +73,8 @@ func llvmFlagName(flag int) string {
 	}
 }
 
-const (
-	llvmVersionMajor = "22"
-	llvmVersion      = llvmVersionMajor + ".1.1"
-)
-
 // newLLVMVariant returns a [pkg.Artifact] containing a LLVM variant.
 func (t Toolchain) newLLVMVariant(variant string, attr *llvmAttr) pkg.Artifact {
-	const checksum = "bQvV6D8AZvQykg7-uQb_saTbVavnSo1ykNJ3g57F5iE-evU3HuOYtcRnVIXTK76e"
 
 	if attr == nil {
 		panic("LLVM attr must be non-nil")
@@ -169,7 +163,7 @@ ln -s ld.lld /work/system/bin/ld
 	return t.NewPackage("llvm", llvmVersion, pkg.NewHTTPGetTar(
 		nil, "https://github.com/llvm/llvm-project/archive/refs/tags/"+
 			"llvmorg-"+llvmVersion+".tar.gz",
-		mustDecode(checksum),
+		mustDecode(llvmChecksum),
 		pkg.TarGzip,
 	), &PackageAttr{
 		Patches:   attr.patches,
diff --git a/internal/rosa/llvm_arm64.go b/internal/rosa/llvm_arm64.go
index febdbbd..7987669 100644
--- a/internal/rosa/llvm_arm64.go
+++ b/internal/rosa/llvm_arm64.go
@@ -2,3 +2,11 @@ package rosa
 
 // clangPatches are patches applied to the LLVM source tree for building clang.
 var clangPatches [][2]string
+
+// one version behind, latest fails 5 tests with 2 flaky on arm64
+const (
+	llvmVersionMajor = "21"
+	llvmVersion      = llvmVersionMajor + ".1.8"
+
+	llvmChecksum = "8SUpqDkcgwOPsqHVtmf9kXfFeVmjVxl4LMn-qSE1AI_Xoeju-9HaoPNGtidyxyka"
+)
diff --git a/internal/rosa/llvm_latest.go b/internal/rosa/llvm_latest.go
new file mode 100644
index 0000000..1a8737f
--- /dev/null
+++ b/internal/rosa/llvm_latest.go
@@ -0,0 +1,11 @@
+//go:build !arm64
+
+package rosa
+
+// latest version of LLVM, conditional to temporarily avoid broken new releases
+const (
+	llvmVersionMajor = "22"
+	llvmVersion      = llvmVersionMajor + ".1.1"
+
+	llvmChecksum = "bQvV6D8AZvQykg7-uQb_saTbVavnSo1ykNJ3g57F5iE-evU3HuOYtcRnVIXTK76e"
+)