1 files changed, 1 insertions, 0 deletions
diff --git a/macros.mk b/macros.mk
index af9801c..cf86dff 100644
--- a/macros.mk
+++ b/macros.mk
@@ -7,6 +7,7 @@ CC?=clang
 LLVM_CONF?=llvm-config
 BUILD_MODE?=COV_NO_CLANG_1Z
 SHELL:=/bin/bash
+MAKEFLAGS+=--warn-undefined-variables
 
 
 CXX_FLAGS=$(shell $(LLVM_CONF) --cxxflags)