Change the format of the embedded Catch 2 header, since MSVC can't handle huge string literals

src/dds/catch2_embedded.cpp → res/catch2.hpp

-#include "./catch2_embedded.hpp"
-
-namespace dds::detail {
-
-const char* const catch2_embedded_single_header_str = R"catch2-embedded(/*
+/*
  *  Catch v2.10.2
  *  Generated: 2019-10-24 17:49:11.459934
  *  ----------------------------------------------------------
 // end catch.hpp
 #endif // TWOBLUECUBES_SINGLE_INCLUDE_CATCH_HPP_INCLUDED
 
-)catch2-embedded";
-
-}

tools/prep-catch2.py

+from pathlib import Path
+
+ROOT = Path(__file__).absolute().parent.parent
+c2_header = ROOT / 'res/catch2.hpp'
+
+buf = c2_header.read_bytes()
+
+chars = ', '.join(f"'\\x{b:02x}'" for b in buf)
+
+c2_embedded = ROOT / 'src/dds/catch2_embeddead_header.cpp'
+c2_embedded.write_text(f'''
+#include "./catch2_embedded.hpp"
+
+namespace dds::detail {{
+
+static const char bytes[] = {{
+    {chars}, '\\x00'
+}};
+const char* const catch2_embedded_single_header_str = bytes;
+
+}}
+''')