From 832785c925cefdc5f629b449383ce659e492ce2e Mon Sep 17 00:00:00 2001
From: firewave <firewave@users.noreply.github.com>
Date: Fri, 29 Mar 2024 11:07:38 +0100
Subject: [PATCH] Makefile: bail out on invalid `HAVE_RULES` value

---
 Makefile              | 2 ++
 tools/dmake/dmake.cpp | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/Makefile b/Makefile
index 23a15c49e54a..72a3ca7d6601 100644
--- a/Makefile
+++ b/Makefile
@@ -160,6 +160,8 @@ ifeq ($(HAVE_RULES),yes)
     else
         LIBS=$(shell $(PCRE_CONFIG) --libs)
     endif
+else ifneq ($(HAVE_RULES),)
+    $(error invalid HAVE_RULES value '$(HAVE_RULES)')
 endif
 
 ifndef PREFIX
diff --git a/tools/dmake/dmake.cpp b/tools/dmake/dmake.cpp
index c74eeac69ef3..a6ecfe56094d 100644
--- a/tools/dmake/dmake.cpp
+++ b/tools/dmake/dmake.cpp
@@ -743,6 +743,8 @@ int main(int argc, char **argv)
          << "    else\n"
          << "        LIBS=$(shell $(PCRE_CONFIG) --libs)\n"
          << "    endif\n"
+         << "else ifneq ($(HAVE_RULES),)\n"
+         << "    $(error invalid HAVE_RULES value '$(HAVE_RULES)')\n"
          << "endif\n\n";
 
     makeConditionalVariable(fout, "PREFIX", "/usr");