cmLocalGenerator: Adopt target compile flag generation

Factor the flag generation out of cmCommonTargetGenerator::GetFlags
into a new cmLocalGenerator::GetTargetCompileFlags method.
This will allow it to be used without a target generator available.

Source/cmCommonTargetGenerator.cxx

@@ -120,38 +120,9 @@ std::string cmCommonTargetGenerator::GetFlags(const std::string& l)
   ByLanguageMap::iterator i = this->FlagsByLanguage.find(l);
   if (i == this->FlagsByLanguage.end()) {
     std::string flags;
-    const char* lang = l.c_str();
 
-    // Add language feature flags.
-    this->AddFeatureFlags(flags, lang);
-
-    this->LocalGenerator->AddArchitectureFlags(flags, this->GeneratorTarget,
-                                               lang, this->ConfigName);
-
-    // Fortran-specific flags computed for this target.
-    if (l == "Fortran") {
-      this->LocalGenerator->AppendFlags(
-        flags, this->LocalGenerator->GetTargetFortranFlags(
-                 this->GeneratorTarget, this->ConfigName));
-    }
-
-    this->LocalGenerator->AddCMP0018Flags(flags, this->GeneratorTarget, lang,
-                                          this->ConfigName);
-
-    this->LocalGenerator->AddVisibilityPresetFlags(
-      flags, this->GeneratorTarget, lang);
-
-    // Append old-style preprocessor definition flags.
-    this->LocalGenerator->AppendFlags(flags, this->Makefile->GetDefineFlags());
-
-    // Add framework directory flags.
-    this->LocalGenerator->AppendFlags(
-      flags, this->LocalGenerator->GetFrameworkFlags(l, this->ConfigName,
-                                                     this->GeneratorTarget));
-
-    // Add target-specific flags.
-    this->LocalGenerator->AddCompileOptions(flags, this->GeneratorTarget, lang,
-                                            this->ConfigName);
+    this->LocalGenerator->GetTargetCompileFlags(this->GeneratorTarget,
+                                                this->ConfigName, l, flags);
 
     ByLanguageMap::value_type entry(l, flags);
     i = this->FlagsByLanguage.insert(entry).first;

Source/cmLocalGenerator.cxx

@@ -1272,6 +1272,33 @@ void cmLocalGenerator::GetTargetFlags(
   }
 }
 
+void cmLocalGenerator::GetTargetCompileFlags(cmGeneratorTarget* target,
+                                             std::string const& config,
+                                             std::string const& lang,
+                                             std::string& flags)
+{
+  cmMakefile* mf = this->GetMakefile();
+
+  // Add language-specific flags.
+  this->AddLanguageFlags(flags, lang, config);
+
+  if (target->GetFeatureAsBool("INTERPROCEDURAL_OPTIMIZATION", config)) {
+    this->AppendFeatureOptions(flags, lang, "IPO");
+  }
+
+  this->AddArchitectureFlags(flags, target, lang, config);
+
+  if (lang == "Fortran") {
+    this->AppendFlags(flags, this->GetTargetFortranFlags(target, config));
+  }
+
+  this->AddCMP0018Flags(flags, target, lang, config);
+  this->AddVisibilityPresetFlags(flags, target, lang);
+  this->AppendFlags(flags, mf->GetDefineFlags());
+  this->AppendFlags(flags, this->GetFrameworkFlags(lang, config, target));
+  this->AddCompileOptions(flags, target, lang, config);
+}
+
 static std::string GetFrameworkFlags(const std::string& lang,
                                      const std::string& config,
                                      cmGeneratorTarget* target)

Source/cmLocalGenerator.h

@@ -317,6 +317,9 @@ public:
   void GetTargetDefines(cmGeneratorTarget const* target,
                         std::string const& config, std::string const& lang,
                         std::set<std::string>& defines) const;
+  void GetTargetCompileFlags(cmGeneratorTarget* target,
+                             std::string const& config,
+                             std::string const& lang, std::string& flags);
 
   std::string GetFrameworkFlags(std::string const& l,
                                 std::string const& config,