add fixes to support clang

Author: HeliumAnt

external/sources/RakNet/meson.build

@@ -9,6 +9,7 @@ deps = []
 
 if cxx.get_argument_syntax() == 'gcc'
   cpp_args = ['-w', '-fpermissive']
+  cpp_options = ['cpp_std=gnu++11']
   if host_machine.system() == 'windows' 
     cpp_args += ['-D_ITERATOR_DEBUG_LEVEL=0','-DWIN32','-D_RAKNET_LIB','-D_CRT_NONSTDC_NO_DEPRECATE','-D_CRT_SECURE_NO_DEPRECATE']
     if get_option('debug')
@@ -32,4 +33,4 @@ else
 endif
 raknet_dep = declare_dependency(link_with: raknet, dependencies: deps, include_directories: raknet_include)
 
-meson.override_dependency('RakNet', raknet_dep)
+meson.override_dependency('RakNet', raknet_dep)

external/sources/RakNet/src/ReplicaManager3.cpp

@@ -138,7 +138,7 @@ void ReplicaManager3::AutoCreateConnectionList(
 {
 	for (unsigned int index=0; index < participantListIn.Size(); index++)
 	{
-		if (GetConnectionByGUID(participantListIn[index], worldId)==false)
+		if (!GetConnectionByGUID(participantListIn[index], worldId))
 		{
 			Connection_RM3 *connection = AllocConnection(rakPeerInterface->GetSystemAddressFromGuid(participantListIn[index]), participantListIn[index]);
 			if (connection)

meson.build

@@ -14,7 +14,7 @@ override_options = []
 suffix=''
 
 if compiler.get_id() == 'clang'
-  error('LLVM clang is not supported due to missing features of the clang standard library. (std::execution)')
+  warning('LLVM clang is not directly supported due to missing features of the clang standard library. Remember to set cpp_std to gnu++20 or force libstdc++ otherwise (std::execution)')
 endif
 
 if host_machine.system() == 'darwin' and get_option('b_lto')