Make Visual Studio use static C runtime libs in Debug configuration

Currently it defaults to dynamic libs which introduces a dependency
to first install them if copying the binaries to another machine.
Hence static libs simplify the developer's life.  This is not needed
for the Release configuration since the relevant dynamic libs are
already part of Windows itself.

Signed-off-by: Dave Thaler <[email protected]>

CMakeLists.txt

@@ -52,6 +52,11 @@ if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU" OR
   set(SANITIZE_FLAGS -fsanitize=address -O1 -fno-omit-frame-pointer)
 elseif ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "MSVC")
   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /std:c++latest")
+
+  # Make debug builds use static C runtime libs to avoid having
+  # to install them.  Release builds don't need this because
+  # the release DLLs are included in Windows.
+  set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} /MTd")
 endif ()
 
 add_library(ebpfverifier ${LIB_SRC})