Make -save-temps behave like in GCC 4.5.

The -save-temps option now behaves like described in GCC 4.5 release notes
(you can specify output directory for temporary files with -save-temps=obj
-o $DIRNAME). I do not have GCC 4.5 installed, so if there are any
inconsistencies between llvmc and GCC in the implementation of this
feature, please let me know.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@74190 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/CompilerDriver/BuiltinOptions.h

@@ -0,0 +1,33 @@
+//===--- BuiltinOptions.h - The LLVM Compiler Driver ------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open
+// Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+//  Declarations of all global command-line option variables.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_INCLUDE_COMPILER_DRIVER_BUILTIN_OPTIONS_H
+#define LLVM_INCLUDE_COMPILER_DRIVER_BUILTIN_OPTIONS_H
+
+#include "llvm/Support/CommandLine.h"
+
+#include <string>
+
+namespace SaveTempsEnum { enum Values { Cwd, Obj, Unset }; }
+
+extern llvm::cl::list<std::string> InputFilenames;
+extern llvm::cl::opt<std::string> OutputFilename;
+extern llvm::cl::list<std::string> Languages;
+extern llvm::cl::opt<bool> DryRun;
+extern llvm::cl::opt<bool> VerboseMode;
+extern llvm::cl::opt<bool> CheckGraph;
+extern llvm::cl::opt<bool> WriteGraph;
+extern llvm::cl::opt<bool> ViewGraph;
+extern llvm::cl::opt<SaveTempsEnum::Values> SaveTemps;
+
+#endif // LLVM_INCLUDE_COMPILER_DRIVER_BUILTIN_OPTIONS_H

include/llvm/CompilerDriver/Main.inc

@@ -17,6 +17,7 @@
 #ifndef LLVM_INCLUDE_COMPILER_DRIVER_MAIN_INC
 #define LLVM_INCLUDE_COMPILER_DRIVER_MAIN_INC
 
+#include "llvm/CompilerDriver/BuiltinOptions.h"
 #include "llvm/CompilerDriver/CompilationGraph.h"
 #include "llvm/CompilerDriver/Error.h"
 #include "llvm/CompilerDriver/ForceLinkage.h"
@@ -58,27 +59,56 @@ cl::opt<bool> WriteGraph("write-graph",
 cl::opt<bool> ViewGraph("view-graph",
                          cl::desc("Show compilation graph in GhostView"),
                          cl::Hidden);
-cl::opt<bool> SaveTemps("save-temps",
-                         cl::desc("Keep temporary files"),
-                         cl::Hidden);
+
+cl::opt<SaveTempsEnum::Values> SaveTemps
+("save-temps", cl::desc("Keep temporary files"),
+ cl::init(SaveTempsEnum::Unset),
+ cl::values(clEnumValN(SaveTempsEnum::Obj, "obj",
+                       "Save files in the directory specified with -o"),
+            clEnumValN(SaveTempsEnum::Cwd, "cwd",
+                       "Use current working directory"),
+            clEnumValN(SaveTempsEnum::Obj, "", "Same as 'cwd'"),
+            clEnumValEnd),
+ cl::ValueOptional);
 
 namespace {
+
+  sys::Path getTempDir() {
+    sys::Path tempDir;
+
+    // GCC 4.5-style -save-temps handling.
+    if (SaveTemps == SaveTempsEnum::Unset) {
+      tempDir = sys::Path::GetTemporaryDirectory();
+    }
+    else if (SaveTemps == SaveTempsEnum::Obj && !OutputFilename.empty()) {
+      tempDir = OutputFilename;
+
+      if (!tempDir.exists()) {
+        std::string ErrMsg;
+        if (tempDir.createDirectoryOnDisk(true, &ErrMsg))
+          throw std::runtime_error(ErrMsg);
+      }
+    }
+    // else if (SaveTemps == Cwd) -> use current dir (leave tempDir empty)
+
+    return tempDir;
+  }
+
   /// BuildTargets - A small wrapper for CompilationGraph::Build.
   int BuildTargets(CompilationGraph& graph, const LanguageMap& langMap) {
     int ret;
-    const sys::Path& tempDir = SaveTemps
-      ? sys::Path("")
-      : sys::Path(sys::Path::GetTemporaryDirectory());
+    const sys::Path& tempDir = getTempDir();
 
     try {
       ret = graph.Build(tempDir, langMap);
     }
     catch(...) {
-      tempDir.eraseFromDisk(true);
+      if (SaveTemps == SaveTempsEnum::Unset)
+        tempDir.eraseFromDisk(true);
       throw;
     }
 
-    if (!SaveTemps)
+    if (SaveTemps == SaveTempsEnum::Unset)
       tempDir.eraseFromDisk(true);
     return ret;
   }

lib/CompilerDriver/Action.cpp

@@ -12,8 +12,8 @@
 //===----------------------------------------------------------------------===//
 
 #include "llvm/CompilerDriver/Action.h"
+#include "llvm/CompilerDriver/BuiltinOptions.h"
 
-#include "llvm/Support/CommandLine.h"
 #include "llvm/System/Program.h"
 
 #include <iostream>
@@ -22,9 +22,6 @@
 using namespace llvm;
 using namespace llvmc;
 
-extern cl::opt<bool> DryRun;
-extern cl::opt<bool> VerboseMode;
-
 namespace {
   int ExecuteProgram(const std::string& name,
                      const StrVector& args) {

lib/CompilerDriver/CompilationGraph.cpp

@@ -11,11 +11,11 @@
 //
 //===----------------------------------------------------------------------===//
 
+#include "llvm/CompilerDriver/BuiltinOptions.h"
 #include "llvm/CompilerDriver/CompilationGraph.h"
 #include "llvm/CompilerDriver/Error.h"
 
 #include "llvm/ADT/STLExtras.h"
-#include "llvm/Support/CommandLine.h"
 #include "llvm/Support/DOTGraphTraits.h"
 #include "llvm/Support/GraphWriter.h"
 
@@ -30,9 +30,6 @@
 using namespace llvm;
 using namespace llvmc;
 
-extern cl::list<std::string> InputFilenames;
-extern cl::list<std::string> Languages;
-
 namespace llvmc {
 
   const std::string& LanguageMap::GetLanguage(const sys::Path& File) const {
@@ -477,7 +474,7 @@ namespace llvm {
   {
 
     template<typename GraphType>
-    static std::string getNodeLabel(const Node* N, const GraphType&, 
+    static std::string getNodeLabel(const Node* N, const GraphType&,
                                     bool ShortNames)
     {
       if (N->ToolPtr)

lib/CompilerDriver/Tool.cpp

@@ -11,16 +11,14 @@
 //
 //===----------------------------------------------------------------------===//
 
+#include "llvm/CompilerDriver/BuiltinOptions.h"
 #include "llvm/CompilerDriver/Tool.h"
 
 #include "llvm/System/Path.h"
-#include "llvm/Support/CommandLine.h"
 
 using namespace llvm;
 using namespace llvmc;
 
-extern cl::opt<std::string> OutputFilename;
-
 namespace {
   sys::Path MakeTempFile(const sys::Path& TempDir, const std::string& BaseName,
                          const std::string& Suffix) {
@@ -39,7 +37,7 @@ namespace {
     // NOTE: makeUnique always *creates* a unique temporary file,
     // which is good, since there will be no races. However, some
     // tools do not like it when the output file already exists, so
-    // they have to be placated with -f or something like that.
+    // they need to be placated with -f or something like that.
     Out.makeUnique(true, NULL);
     return Out;
   }
@@ -52,7 +50,7 @@ sys::Path Tool::OutFilename(const sys::Path& In,
   sys::Path Out;
 
   if (StopCompilation) {
-    if (!OutputFilename.empty()) {
+    if (!OutputFilename.empty() && SaveTemps != SaveTempsEnum::Obj ) {
       Out.set(OutputFilename);
     }
     else if (IsJoin()) {