cmTarget: Add per-config compilation info

Add a cmTarget::CompileInfo struct to hold per-configuration information
about the compilation settings in a target.  This is different than
cmTarget::OutputInfo because it applies to any targets that can compile
sources even if they do not link or archive.

Source/cmTarget.cxx

@@ -71,6 +71,11 @@ struct cmTarget::ImportInfo
   cmTarget::LinkInterface LinkInterface;
 };
 
+//----------------------------------------------------------------------------
+struct cmTarget::CompileInfo
+{
+};
+
 struct TargetConfigPair : public std::pair<cmTarget const* , std::string> {
   TargetConfigPair(cmTarget const* tgt, const std::string &config)
     : std::pair<cmTarget const* , std::string>(tgt, config) {}
@@ -116,6 +121,9 @@ public:
                                                             ImportInfoMapType;
   ImportInfoMapType ImportInfoMap;
 
+  typedef std::map<std::string, cmTarget::CompileInfo> CompileInfoMapType;
+  CompileInfoMapType CompileInfoMap;
+
   // Cache link implementation computation from each configuration.
   typedef std::map<TargetConfigPair,
                    cmTarget::LinkImplementation> LinkImplMapType;
@@ -2477,6 +2485,44 @@ cmTarget::OutputInfo const* cmTarget::GetOutputInfo(const char* config) const
   return &i->second;
 }
 
+//----------------------------------------------------------------------------
+cmTarget::CompileInfo const* cmTarget::GetCompileInfo(const char* config) const
+{
+  // There is no compile information for imported targets.
+  if(this->IsImported())
+    {
+    return 0;
+    }
+
+  if(this->GetType() > cmTarget::OBJECT_LIBRARY)
+    {
+    std::string msg = "cmTarget::GetCompileInfo called for ";
+    msg += this->GetName();
+    msg += " which has type ";
+    msg += cmTarget::GetTargetTypeName(this->GetType());
+    this->GetMakefile()->IssueMessage(cmake::INTERNAL_ERROR, msg);
+    abort();
+    return 0;
+    }
+
+  // Lookup/compute/cache the compile information for this configuration.
+  std::string config_upper;
+  if(config && *config)
+    {
+    config_upper = cmSystemTools::UpperCase(config);
+    }
+  typedef cmTargetInternals::CompileInfoMapType CompileInfoMapType;
+  CompileInfoMapType::const_iterator i =
+    this->Internal->CompileInfoMap.find(config_upper);
+  if(i == this->Internal->CompileInfoMap.end())
+    {
+    CompileInfo info;
+    CompileInfoMapType::value_type entry(config_upper, info);
+    i = this->Internal->CompileInfoMap.insert(entry).first;
+    }
+  return &i->second;
+}
+
 //----------------------------------------------------------------------------
 std::string cmTarget::GetDirectory(const char* config, bool implib) const
 {

Source/cmTarget.h

@@ -720,6 +720,10 @@ private:
   void ComputeImportInfo(std::string const& desired_config, ImportInfo& info,
                                         cmTarget const* head) const;
 
+  // Cache target compile paths for each configuration.
+  struct CompileInfo;
+  CompileInfo const* GetCompileInfo(const char* config) const;
+
   mutable cmTargetLinkInformationMap LinkInformation;
   void CheckPropertyCompatibility(cmComputeLinkInformation *info,
                                   const char* config) const;