Fix 32-bit MSVC compiler error due to unknown command #warning

[thbeu]

Resolves #2201

[yhirose]

@thbeu how about this? It's simpler and no code duplication.

/*
 * Platform compatibility check
 */

#if defined(_WIN32) && !defined(_WIN64)
#if defined(_MSC_VER)
#pragma message(                                                               \
    "cpp-httplib doesn't support 32-bit Windows. Please use a 64-bit compiler.")
#else
#warning                                                                       \
    "cpp-httplib doesn't support 32-bit Windows. Please use a 64-bit compiler."
#endif
#elif defined(__SIZEOF_POINTER__) && __SIZEOF_POINTER__ < 8
#warning                                                                       \
    "cpp-httplib doesn't support 32-bit platforms. Please use a 64-bit compiler."
#elif defined(__SIZEOF_SIZE_T__) && __SIZEOF_SIZE_T__ < 8
#warning                                                                       \
    "cpp-httplib doesn't support platforms where size_t is less than 64 bits."
#endif

[yhirose]

Could you please show me what error you get when you run my suggested code with v0.25.0 MSVC on your machine?

[thbeu]

Could you please show me what error you get when you run my suggested code with v0.25.0 MSVC on your machine?

Builds as expected (with one warning C4244 though).

MSBuild-Version 17.14.18+a338add32 für .NET Framework

  1>Checking Build System
  Building Custom Rule C:/Users/thbeu/source/repos/cpp-httplib/CMakeLists.txt
  httplib.cc
  cpp-httplib doesn't support 32-bit Windows. Please use a 64-bit compiler.
C:\Program Files\Microsoft Visual Studio\2022\Enterprise\VC\Tools\MSVC\14.44.35207\include\utility(303,16): warning C4244: "Initialisierung": Konvertierung von "_Ty" in "_Ty1", möglicher Datenverlust [C:\Users\thbeu\source\repos\cpp-httplib\build2\httplib.vcxproj]
C:\Program Files\Microsoft Visual Studio\2022\Enterprise\VC\Tools\MSVC\14.44.35207\include\utility(303,16): warning C4244:         with [C:\Users\thbeu\source\repos\cpp-httplib\build2\httplib.vcxproj]
C:\Program Files\Microsoft Visual Studio\2022\Enterprise\VC\Tools\MSVC\14.44.35207\include\utility(303,16): warning C4244:         [ [C:\Users\thbeu\source\repos\cpp-httplib\build2\httplib.vcxproj]
C:\Program Files\Microsoft Visual Studio\2022\Enterprise\VC\Tools\MSVC\14.44.35207\include\utility(303,16): warning C4244:             _Ty=__int64 [C:\Users\thbeu\source\repos\cpp-httplib\build2\httplib.vcxproj]
C:\Program Files\Microsoft Visual Studio\2022\Enterprise\VC\Tools\MSVC\14.44.35207\include\utility(303,16): warning C4244:         ] [C:\Users\thbeu\source\repos\cpp-httplib\build2\httplib.vcxproj]
C:\Program Files\Microsoft Visual Studio\2022\Enterprise\VC\Tools\MSVC\14.44.35207\include\utility(303,16): warning C4244:         and [C:\Users\thbeu\source\repos\cpp-httplib\build2\httplib.vcxproj]
C:\Program Files\Microsoft Visual Studio\2022\Enterprise\VC\Tools\MSVC\14.44.35207\include\utility(303,16): warning C4244:         [ [C:\Users\thbeu\source\repos\cpp-httplib\build2\httplib.vcxproj]
C:\Program Files\Microsoft Visual Studio\2022\Enterprise\VC\Tools\MSVC\14.44.35207\include\utility(303,16): warning C4244:             _Ty1=size_t [C:\Users\thbeu\source\repos\cpp-httplib\build2\httplib.vcxproj]
C:\Program Files\Microsoft Visual Studio\2022\Enterprise\VC\Tools\MSVC\14.44.35207\include\utility(303,16): warning C4244:         ] [C:\Users\thbeu\source\repos\cpp-httplib\build2\httplib.vcxproj]
  (Quelldatei „out/httplib.cc“ wird kompiliert)
      C:\Program Files\Microsoft Visual Studio\2022\Enterprise\VC\Tools\MSVC\14.44.35207\include\utility(303,16):
      der Vorlageninstanziierungskontext (der älteste zuerst) ist
          C:\Users\thbeu\source\repos\cpp-httplib\build2\out\httplib.cc(3292,24):
          Siehe Verweis auf die gerade kompilierte Instanziierung "std::pair<size_t,size_t>::pair<__int64,unsigned int,0>(std::pair<__int64,unsigned int> &&) noexcept" der Funktions-Vorlage.
              C:\Users\thbeu\source\repos\cpp-httplib\build2\out\httplib.cc(3292,3):
              Ersten Verweis auf "std::pair<size_t,size_t>::pair" in "httplib::detail::get_range_offset_and_length" anzeigen
  
  httplib.vcxproj -> C:\Users\thbeu\source\repos\cpp-httplib\build2\Debug\cpp-httplib.lib
  Building Custom Rule C:/Users/thbeu/source/repos/cpp-httplib/CMakeLists.txt

I updated PR accordingly.

[yhirose]

@thbeu thanks for your contribution!