From 8b2e7da70855e48c0ba8c874fa528b599fb7c9a9 Mon Sep 17 00:00:00 2001
From: Brooks Davis <brooks@FreeBSD.org>
Date: Wed, 23 Oct 2024 23:37:28 +0100
Subject: [PATCH] llvm19: permit incremental builds from llvm18

Detect and delete out of date clang-tblgen produced output.  I found it
sufficent for compilation to delete only arm_*.inc files, but it seems
safer to regenerate all output and a few extra clang-tblgen runs pales
in comparison to the full build we're doing at this point.

Reviewed by:	dim, emaste
Differential Revision:	https://reviews.freebsd.org/D47270
---
 tools/build/depend-cleanup.sh | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/tools/build/depend-cleanup.sh b/tools/build/depend-cleanup.sh
index 001a450bf18..3678e3368b3 100755
--- a/tools/build/depend-cleanup.sh
+++ b/tools/build/depend-cleanup.sh
@@ -215,3 +215,13 @@ if [ ${MACHINE} = riscv ]; then
 		fi
 	done
 fi
+
+# 20241018  5deeebd8c6ca   Merge llvm-project release/19.x llvmorg-19.1.2-0-g7ba7d8e2f7b6
+p="$OBJTOP"/lib/clang/libclang/clang/Basic
+f="$p"/arm_mve_builtin_sema.inc
+if [ -e "$f" ]; then
+	if grep -q SemaBuiltinConstantArgRange "$f"; then
+		echo "Removing pre-llvm19 clang-tblgen output"
+		run rm -f "$p"/*.inc
+	fi
+fi