cmGlobalGenerator: Allow FindMakeProgram to fail

Revise its signature to return `bool` so that it can fail and abort
configuration early.

Source/cmGlobalGenerator.cxx

@@ -269,12 +269,13 @@ bool cmGlobalGenerator::IsExportedTargetsFile(
 }
 
 // Find the make program for the generator, required for try compiles
-void cmGlobalGenerator::FindMakeProgram(cmMakefile* mf)
+bool cmGlobalGenerator::FindMakeProgram(cmMakefile* mf)
 {
   if (this->FindMakeProgramFile.empty()) {
     cmSystemTools::Error(
       "Generator implementation error, "
       "all generators must specify this->FindMakeProgramFile");
+    return false;
   }
   if (!mf->GetDefinition("CMAKE_MAKE_PROGRAM") ||
       cmSystemTools::IsOff(mf->GetDefinition("CMAKE_MAKE_PROGRAM"))) {
@@ -292,7 +293,7 @@ void cmGlobalGenerator::FindMakeProgram(cmMakefile* mf)
         << "probably need to select a different build tool.";
     cmSystemTools::Error(err.str().c_str());
     cmSystemTools::SetFatalErrorOccured();
-    return;
+    return false;
   }
   std::string makeProgram = mf->GetRequiredDefinition("CMAKE_MAKE_PROGRAM");
   // if there are spaces in the make program use short path
@@ -311,6 +312,7 @@ void cmGlobalGenerator::FindMakeProgram(cmMakefile* mf)
     mf->AddCacheDefinition("CMAKE_MAKE_PROGRAM", makeProgram.c_str(),
                            "make program", cmStateEnums::FILEPATH);
   }
+  return true;
 }
 
 bool cmGlobalGenerator::CheckLanguages(
@@ -426,7 +428,9 @@ void cmGlobalGenerator::EnableLanguage(
   mf->AddDefinition("CMAKE_PLATFORM_INFO_DIR", rootBin.c_str());
 
   // find and make sure CMAKE_MAKE_PROGRAM is defined
-  this->FindMakeProgram(mf);
+  if (!this->FindMakeProgram(mf)) {
+    return;
+  }
 
   if (!this->CheckLanguages(languages, mf)) {
     return;

Source/cmGlobalGenerator.h

@@ -250,7 +250,7 @@ public:
   /*
    * Determine what program to use for building the project.
    */
-  virtual void FindMakeProgram(cmMakefile*);
+  virtual bool FindMakeProgram(cmMakefile*);
 
   ///! Find a target by name by searching the local generators.
   cmTarget* FindTarget(const std::string& name,

Source/cmGlobalGhsMultiGenerator.cxx

@@ -73,7 +73,7 @@ void cmGlobalGhsMultiGenerator::EnableLanguage(
   this->cmGlobalGenerator::EnableLanguage(l, mf, optional);
 }
 
-void cmGlobalGhsMultiGenerator::FindMakeProgram(cmMakefile* mf)
+bool cmGlobalGhsMultiGenerator::FindMakeProgram(cmMakefile* mf)
 {
   // The GHS generator knows how to lookup its build tool
   // directly instead of needing a helper module to do it, so we
@@ -82,6 +82,7 @@ void cmGlobalGhsMultiGenerator::FindMakeProgram(cmMakefile* mf)
     mf->AddDefinition("CMAKE_MAKE_PROGRAM",
                       this->GetGhsBuildCommand().c_str());
   }
+  return true;
 }
 
 std::string const& cmGlobalGhsMultiGenerator::GetGhsBuildCommand()

Source/cmGlobalGhsMultiGenerator.h

@@ -57,7 +57,7 @@ public:
   /*
   * Determine what program to use for building the project.
   */
-  virtual void FindMakeProgram(cmMakefile*);
+  bool FindMakeProgram(cmMakefile* mf) CM_OVERRIDE;
 
   cmGeneratedFileStream* GetBuildFileStream()
   {

Source/cmGlobalNinjaGenerator.cxx

@@ -553,9 +553,11 @@ void cmGlobalNinjaGenerator::Generate()
   this->CloseBuildFileStream();
 }
 
-void cmGlobalNinjaGenerator::FindMakeProgram(cmMakefile* mf)
+bool cmGlobalNinjaGenerator::FindMakeProgram(cmMakefile* mf)
 {
-  this->cmGlobalGenerator::FindMakeProgram(mf);
+  if (!this->cmGlobalGenerator::FindMakeProgram(mf)) {
+    return false;
+  }
   if (const char* ninjaCommand = mf->GetDefinition("CMAKE_MAKE_PROGRAM")) {
     this->NinjaCommand = ninjaCommand;
     std::vector<std::string> command;
@@ -567,6 +569,7 @@ void cmGlobalNinjaGenerator::FindMakeProgram(cmMakefile* mf)
     this->NinjaVersion = cmSystemTools::TrimWhitespace(version);
     this->CheckNinjaFeatures();
   }
+  return true;
 }
 
 void cmGlobalNinjaGenerator::CheckNinjaFeatures()

Source/cmGlobalNinjaGenerator.h

@@ -357,7 +357,7 @@ protected:
 
 private:
   std::string GetEditCacheCommand() const CM_OVERRIDE;
-  void FindMakeProgram(cmMakefile* mf) CM_OVERRIDE;
+  bool FindMakeProgram(cmMakefile* mf) CM_OVERRIDE;
   void CheckNinjaFeatures();
   bool CheckLanguages(std::vector<std::string> const& languages,
                       cmMakefile* mf) const CM_OVERRIDE;

Source/cmGlobalVisualStudio10Generator.cxx

@@ -357,11 +357,14 @@ cmGlobalVisualStudio10Generator::GetPlatformToolsetHostArchitecture() const
   return CM_NULLPTR;
 }
 
-void cmGlobalVisualStudio10Generator::FindMakeProgram(cmMakefile* mf)
+bool cmGlobalVisualStudio10Generator::FindMakeProgram(cmMakefile* mf)
 {
-  this->cmGlobalVisualStudio8Generator::FindMakeProgram(mf);
+  if (!this->cmGlobalVisualStudio8Generator::FindMakeProgram(mf)) {
+    return false;
+  }
   mf->AddDefinition("CMAKE_VS_MSBUILD_COMMAND",
                     this->GetMSBuildCommand().c_str());
+  return true;
 }
 
 std::string const& cmGlobalVisualStudio10Generator::GetMSBuildCommand()

Source/cmGlobalVisualStudio10Generator.h

@@ -84,7 +84,7 @@ public:
 
   virtual const char* GetToolsVersion() { return "4.0"; }
 
-  virtual void FindMakeProgram(cmMakefile*);
+  bool FindMakeProgram(cmMakefile* mf) CM_OVERRIDE;
 
   static std::string GetInstalledNsightTegraVersion();
 

Source/cmGlobalVisualStudio7Generator.cxx

@@ -123,11 +123,14 @@ void cmGlobalVisualStudio7Generator::EnableLanguage(
   }
 }
 
-void cmGlobalVisualStudio7Generator::FindMakeProgram(cmMakefile* mf)
+bool cmGlobalVisualStudio7Generator::FindMakeProgram(cmMakefile* mf)
 {
-  this->cmGlobalVisualStudioGenerator::FindMakeProgram(mf);
+  if (!this->cmGlobalVisualStudioGenerator::FindMakeProgram(mf)) {
+    return false;
+  }
   mf->AddDefinition("CMAKE_VS_DEVENV_COMMAND",
                     this->GetDevEnvCommand().c_str());
+  return true;
 }
 
 std::string const& cmGlobalVisualStudio7Generator::GetDevEnvCommand()

Source/cmGlobalVisualStudio7Generator.h

@@ -91,7 +91,7 @@ public:
 
   const char* GetIntelProjectVersion();
 
-  virtual void FindMakeProgram(cmMakefile*);
+  bool FindMakeProgram(cmMakefile* mf) CM_OVERRIDE;
 
   /** Is the Microsoft Assembler enabled?  */
   bool IsMasmEnabled() const { return this->MasmEnabled; }

Source/cmGlobalVisualStudioGenerator.cxx

@@ -395,7 +395,7 @@ void cmGlobalVisualStudioGenerator::ComputeVSTargetDepends(
   }
 }
 
-void cmGlobalVisualStudioGenerator::FindMakeProgram(cmMakefile* mf)
+bool cmGlobalVisualStudioGenerator::FindMakeProgram(cmMakefile* mf)
 {
   // Visual Studio generators know how to lookup their build tool
   // directly instead of needing a helper module to do it, so we
@@ -403,6 +403,7 @@ void cmGlobalVisualStudioGenerator::FindMakeProgram(cmMakefile* mf)
   if (cmSystemTools::IsOff(mf->GetDefinition("CMAKE_MAKE_PROGRAM"))) {
     mf->AddDefinition("CMAKE_MAKE_PROGRAM", this->GetVSMakeProgram().c_str());
   }
+  return true;
 }
 
 std::string cmGlobalVisualStudioGenerator::GetUtilityDepend(

Source/cmGlobalVisualStudioGenerator.h

@@ -102,7 +102,7 @@ public:
   };
   class OrderedTargetDependSet;
 
-  virtual void FindMakeProgram(cmMakefile*);
+  bool FindMakeProgram(cmMakefile*) CM_OVERRIDE;
 
   virtual std::string ExpandCFGIntDir(const std::string& str,
                                       const std::string& config) const;

Source/cmGlobalXCodeGenerator.cxx

@@ -182,7 +182,7 @@ cmGlobalGenerator* cmGlobalXCodeGenerator::Factory::CreateGlobalGenerator(
 #endif
 }
 
-void cmGlobalXCodeGenerator::FindMakeProgram(cmMakefile* mf)
+bool cmGlobalXCodeGenerator::FindMakeProgram(cmMakefile* mf)
 {
   // The Xcode generator knows how to lookup its build tool
   // directly instead of needing a helper module to do it, so we
@@ -191,6 +191,7 @@ void cmGlobalXCodeGenerator::FindMakeProgram(cmMakefile* mf)
     mf->AddDefinition("CMAKE_MAKE_PROGRAM",
                       this->GetXcodeBuildCommand().c_str());
   }
+  return true;
 }
 
 std::string const& cmGlobalXCodeGenerator::GetXcodeBuildCommand()

Source/cmGlobalXCodeGenerator.h

@@ -58,7 +58,7 @@ public:
                                         const std::string& suffix,
                                         std::string& dir);
 
-  virtual void FindMakeProgram(cmMakefile*);
+  bool FindMakeProgram(cmMakefile*) CM_OVERRIDE;
 
   ///! What is the configurations directory variable called?
   virtual const char* GetCMakeCFGIntDir() const;