Fixes + more setup, added more directories to clean script.

singleheader/gen.singleheader.cpp

@@ -0,0 +1,11 @@
+#define GEN_DEFINE_LIBRARY_CODE_CONSTANTS
+#define GEN_ENFORCE_STRONG_CODE_TYPES
+#define GEN_EXPOSE_BACKEND
+#include "gen.cpp"
+
+using namespace gen;
+
+int gen_main()
+{
+	return 0;
+}

singleheader/meson.build

@@ -7,7 +7,7 @@ includes = include_directories(
 
 sources = [ 'gen.singleheader.cpp' ]
 
-if get_option('buildtype').sartswith('debug')
+if get_option('buildtype').startswith('debug')
 
   add_project_arguments('-DBuild_Debug', language : ['c', 'cpp'])