forgot about stb_sprintf.h...

tests/cpp17_sanity.cpp

@@ -0,0 +1,22 @@
+#include "md.h"
+#include "md.c"
+
+#include <stdio.h>
+
+static MD_Arena *arena = 0;
+
+int main(void)
+{
+    arena = MD_ArenaAlloc();
+    
+    printf("%d\n", MD_CPP_VERSION);
+    
+#if MD_CPP_VERSION != 0 && MD_CPP_VERSION != 98 // anything C++11 and up
+    MD_String8 foo = "foo"_md;
+    MD_String8 bar = "bar"_md;
+    MD_String8 str = MD_S8Fmt(arena, "%S%S", foo, bar);
+    printf("%.*s", MD_S8VArg(str));
+#endif
+
+    return 0;
+}