Link with LLVMProfileData only if it exists in libdirs.

This library exists only in recent llvm, so adding it to link, breaks windows builds...
Premake do not allow this, so implement StaticLinksOpt in Helpers.lua

build/Helpers.lua

@@ -94,3 +94,28 @@ function IncludeDir(dir)
     end
   end
 end
+
+function StaticLinksOpt(libnames)
+  local cc = configuration()
+  local path = table.concat(cc.configset.libdirs, ";")
+
+  local formats
+  if os.is("windows") then
+    formats = { "%s.lib" }
+  else
+    formats = { "lib%s.a" }
+  end
+  table.insert(formats, "%s");
+
+  local existing_libnames = {}
+  for _, libname in ipairs(libnames) do
+    for _, fmt in ipairs(formats) do
+      local name = string.format(fmt, libname)
+      if os.pathsearch(name, path) then
+        table.insert(existing_libnames, libname)
+      end
+    end
+  end
+
+  links(existing_libnames)
+end

build/LLVM.lua

@@ -52,7 +52,6 @@ function SetupLLVMLibs()
       "LLVMObjCARCOpts",
       "LLVMObject",
       "LLVMOption",
-      "LLVMProfileData",
       "LLVMScalarOpts",
       "LLVMSupport",
       "LLVMTarget",
@@ -75,6 +74,7 @@ function SetupLLVMLibs()
       "clangSema",
       "clangSerialization",
     }
+    StaticLinksOpt { "LLVMProfileData" }
     
   configuration(c)
 end