Clean up and centralize LLVM target initialization

ispc.cpp

@@ -72,10 +72,6 @@ Module *m;
 bool
 Target::GetTarget(const char *arch, const char *cpu, const char *isa,
                   Target *t) {
-    // initialize available targets
-    LLVMInitializeX86Target();
-    LLVMInitializeX86TargetInfo();
-
     if (cpu == NULL) {
         std::string hostCPU = llvm::sys::getHostCPUName();
         if (hostCPU.size() > 0)

main.cpp

@@ -41,9 +41,17 @@
 #include <stdlib.h>
 #include <llvm/Support/PrettyStackTrace.h>
 #ifdef LLVM_2_8
-#include <llvm/System/Signals.h>
+  #include <llvm/System/Signals.h>
 #else
-#include <llvm/Support/Signals.h>
+  #include <llvm/Support/Signals.h>
+#endif
+#if defined(LLVM_3_0) || defined(LLVM_3_0svn)
+  #include <llvm/Support/TargetRegistry.h>
+  #include <llvm/Support/TargetSelect.h>
+#else
+  #include <llvm/Target/TargetRegistry.h>
+  #include <llvm/Target/TargetSelect.h>
+  #include <llvm/Target/SubtargetFeature.h>
 #endif
 
 #ifdef ISPC_IS_WINDOWS
@@ -154,6 +162,16 @@ int main(int Argc, char *Argv[]) {
     llvm::sys::PrintStackTraceOnErrorSignal();
     llvm::PrettyStackTraceProgram X(argc, argv);
 
+    // initialize available LLVM targets
+    LLVMInitializeX86TargetInfo();
+    LLVMInitializeX86Target();
+    LLVMInitializeX86AsmPrinter();
+    LLVMInitializeX86AsmParser();
+    LLVMInitializeX86Disassembler();
+#if defined(LLVM_3_0) || defined(LLVM_3_0svn)
+    LLVMInitializeX86TargetMC();
+#endif
+
     char *file = NULL;
     const char *headerFileName = NULL;
     const char *outFileName = NULL;

module.cpp

@@ -74,14 +74,6 @@
 #include <llvm/Target/TargetMachine.h>
 #include <llvm/Target/TargetOptions.h>
 #include <llvm/Target/TargetData.h>
-#if defined(LLVM_3_0) || defined(LLVM_3_0svn)
-  #include <llvm/Support/TargetRegistry.h>
-  #include <llvm/Support/TargetSelect.h>
-#else
-  #include <llvm/Target/TargetRegistry.h>
-  #include <llvm/Target/TargetSelect.h>
-  #include <llvm/Target/SubtargetFeature.h>
-#endif
 #include <llvm/PassManager.h>
 #include <llvm/Analysis/Verifier.h>
 #include <llvm/Support/CFG.h>
@@ -935,12 +927,6 @@ Module::WriteOutput(OutputType outputType, const char *outFileName) {
 
 bool
 Module::writeObjectFileOrAssembly(OutputType outputType, const char *outFileName) {
-#if defined(LLVM_3_0) || defined(LLVM_3_0svn)
-    LLVMInitializeX86TargetMC();
-#endif
-    LLVMInitializeX86AsmPrinter();
-    LLVMInitializeX86AsmParser();
-
     llvm::TargetMachine *targetMachine = g->target.GetTargetMachine();
 
     // Figure out if we're generating object file or assembly output, and