From a1e0579bad927b94d2bc87c895b7fa966bed854d Mon Sep 17 00:00:00 2001
From: Norbert Lange <nolange79@gmail.com>
Date: Tue, 7 Nov 2023 21:42:19 +0100
Subject: [PATCH] if using an existing clang, test if cfguard is available

---
 build-all.sh | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/build-all.sh b/build-all.sh
index ba8603d..3601ec5 100755
--- a/build-all.sh
+++ b/build-all.sh
@@ -95,6 +95,10 @@ for dep in git cmake ${HOST_CLANG}; do
     fi
 done
 
+if [ -n "${HOST_CLANG}" ] && [ "${CFGUARD_ARGS}" = "--enable-cfguard"  ]; then
+    "${HOST_CLANG}" -c -x c -o - - -Werror -mguard=cf </dev/null >/dev/null 2>/dev/null || CFGUARD_ARGS="--disable-cfguard"
+fi
+
 if [ -z "$NO_TOOLS" ]; then
     if [ -z "${HOST_CLANG}" ]; then
         ./build-llvm.sh $PREFIX $LLVM_ARGS $HOST_ARGS