8352481: Enforce the use of lld with clang

make/autoconf/toolchain.m4

@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2011, 2024, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2011, 2025, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # This code is free software; you can redistribute it and/or modify it
@@ -620,6 +620,13 @@ AC_DEFUN_ONCE([TOOLCHAIN_DETECT_TOOLCHAIN_CORE],
     # All other toolchains use the compiler to link.
     LD="$CC"
     LDCXX="$CXX"
+    # Force use of lld, since that is what we expect when setting flags later on
+    if test "x$TOOLCHAIN_TYPE" = xclang; then
+      if test "x$OPENJDK_TARGET_OS" = xlinux; then
+        LD="$LD -fuse-ld=lld"
+        LDCXX="$LDCXX -fuse-ld=lld"
+      fi
+    fi
   fi
   AC_SUBST(LD)
   # FIXME: it should be CXXLD, according to standard (cf CXXCPP)