fix build issues and include path on windows

Author: Zach DeVito

src/tcompiler.cpp

@@ -328,7 +328,7 @@ static void InitializeJIT(TerraCompilationUnit * CU) {
     if(CU->ee) return; //already initialized
     Module * topeemodule = (CU->T->options.usemcjit) ? new Module("terra",*CU->TT->ctx) : CU->M;
 #ifdef _WIN32
-	std::string MCJITTriple = CU->Triple;
+	std::string MCJITTriple = CU->TT->Triple;
 	MCJITTriple.append("-elf"); //on windows we need to use an elf container because coff is not supported yet
 	topeemodule->setTargetTriple(MCJITTriple);
 #else
@@ -787,7 +787,7 @@ struct CCallingConv {
 #else
     Type * TypeForClass(size_t size, RegisterClass clz) {
         assert(size <= 8);
-        return Type::getIntNTy(*C->ctx, size * 8); 
+        return Type::getIntNTy(*CU->TT->ctx, size * 8); 
     }
     bool ValidAggregateSize(size_t sz) {
         bool isPow2 = sz && !(sz & (sz - 1));
@@ -847,7 +847,7 @@ struct CCallingConv {
         //to be translated to void. So if it is unit, force the return value to be void by overriding the normal 
         //classification decision
         if(Ty->IsUnitType(&returntype)) {
-            info->returntype = Argument(C_AGGREGATE_REG,info->returntype.type,StructType::get(*C->ctx));
+            info->returntype = Argument(C_AGGREGATE_REG,info->returntype.type,StructType::get(*CU->TT->ctx));
         }
         #endif
 

src/terralib.lua

@@ -544,6 +544,7 @@ function terra.newtarget(tbl)
         Features = Features or ""
     end
     return setmetatable({ llvm_target = cdatawithdestructor(terra.inittarget(Triple,CPU,Features,FloatABIHard),terra.freetarget),
+                          Triple = Triple,
                           cnametostruct = { general = {}, tagged = {}}  --map from llvm_name -> terra type used to make c structs unique per llvm_name
                         },terra.target)
 end
@@ -3645,8 +3646,12 @@ end
 
 function terra.includecstring(code,cargs,target)
     local args = terra.newlist {"-O3","-Wno-deprecated","-resource-dir",clangresourcedirectory}
-    args:insert("-internal-isystem")
-    args:insert(clangresourcedirectory.."/include")
+    target = target or terra.nativetarget
+
+    if (target == terra.nativetarget and ffi.os == "Linux") or (target.Triple and target.Triple:match("linux")) then
+        args:insert("-internal-isystem")
+        args:insert(clangresourcedirectory.."/include")
+    end
 
     if cargs then
         args:insertall(cargs)
@@ -3655,7 +3660,6 @@ function terra.includecstring(code,cargs,target)
         args:insert("-I")
         args:insert(p)
     end
-    target = target or terra.nativetarget
     assert(terra.istarget(target),"expected a target or nil to specify the native target")
     local result = terra.registercfile(target,code,args,headerprovider)
     local general,tagged,errors,macros = result.general,result.tagged,result.errors,result.macros