[*] Set explicit clang microarchitecture targets of x86_32 and x86_64 processors

Core/project.lua

@@ -157,6 +157,26 @@ local function configureProjectForPlatforms(projType)
     end)
 end
 
+local function configureProjectCPUTarget()
+    filter { "toolset:clang", "architecture:x86_64"}
+        -- Some discount VPSes might be running on this dead architecture
+        -- Haswell introduced AVX2.
+        -- clang cpu levels: x86_64-v4 contains meme avx512 instructions and beyond, x86_64-v3 includes AVX1+2, x86_64-v2 doesn't have any AVX whatsoever.
+        -- Dunno if intentional because SSE4.1 >= AVX, but either way, let's get some modern CPU features in an otherwise widely supported binary.
+        -- Lets sit between v2 and v3 by a single intel generation.
+        buildoptions { "-march=ivybridge" }
+        defines {"AURORA_RUNTIME_MEMSET=__builtin_memset"}
+        defines {"AURORA_RUNTIME_MEMCPY=__builtin_memcpy"}
+    filter {}
+
+    filter { "toolset:clang", "architecture:x86"}
+        -- Let Linux x86_32 support Intel Core+ (2006) CPUs
+        buildoptions { "-march=core2" }
+        defines {"AURORA_RUNTIME_MEMSET=__builtin_memset"}
+        defines {"AURORA_RUNTIME_MEMCPY=__builtin_memcpy"}
+    filter {}
+end
+
 local function configureProjectErrors()
     if (not Aurora.Settings.bDisableWarningsThatAnnoyRec) then
         return
@@ -194,7 +214,7 @@ local function configureProjectErrors()
             "unknown-warning-option"
         }
 
-    filter{}
+    filter {}
 
     if (targetingCmake) then
         filter {"toolset:msc"}
@@ -379,6 +399,7 @@ local function setupProject(prj)
     configureProjectForSolution(prj)
     configureProjectErrors()
     configureProjectForCompiler()
+    configureProjectCPUTarget()
     configureProjectForPlatforms(prj.projectType)
     configureProjectForTarget()
     configureProjectForDebug(prj)