Treat use of undeclared functions as error

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3f6918f..58fab11 100644 (file)
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -127,6 +127,7 @@ endif()
 
 if(MSVC)
     add_compile_options(/W4 /Zi /GS /fp:fast /permissive- /MP /Qspectre)
+    add_compile_options(/we4013)    # '%s' undefined; assuming extern returning int
     
     if(TIM41_USE_AVX2)
         add_compile_options(/arch:AVX2)