export(): Process the export() command at generate time.

Make the API for adding targets string based so that it can easily
use cmGeneratorTarget.

Teach the cmIncludeCommand to generate the exported file at
configure-time instead if it is to be include()d.

The RunCMake.ExportWithoutLanguage test now needs a dummy header.h
file as expected error from export() is now reported after the
missing file error.

Source/cmExportBuildFileGenerator.cxx

@@ -21,20 +21,19 @@ cmExportBuildFileGenerator::cmExportBuildFileGenerator()
 //----------------------------------------------------------------------------
 bool cmExportBuildFileGenerator::GenerateMainFile(std::ostream& os)
 {
-  std::vector<cmTarget*> allTargets;
   {
   std::string expectedTargets;
   std::string sep;
-  for(std::vector<cmTarget*>::const_iterator
-        tei = this->Exports->begin();
-      tei != this->Exports->end(); ++tei)
+  for(std::vector<std::string>::const_iterator
+        tei = this->Targets.begin();
+      tei != this->Targets.end(); ++tei)
     {
-    expectedTargets += sep + this->Namespace + (*tei)->GetExportName();
+    cmTarget *te = this->Makefile->FindTargetToUse(tei->c_str());
+    expectedTargets += sep + this->Namespace + te->GetExportName();
     sep = " ";
-    cmTarget* te = *tei;
     if(this->ExportedTargets.insert(te).second)
       {
-      allTargets.push_back(te);
+      this->Exports.push_back(te);
       }
     else
       {
@@ -57,8 +56,8 @@ bool cmExportBuildFileGenerator::GenerateMainFile(std::ostream& os)
 
   // Create all the imported targets.
   for(std::vector<cmTarget*>::const_iterator
-        tei = allTargets.begin();
-      tei != allTargets.end(); ++tei)
+        tei = this->Exports.begin();
+      tei != this->Exports.end(); ++tei)
     {
     cmTarget* te = *tei;
     this->GenerateImportTargetCode(os, te);
@@ -113,8 +112,8 @@ cmExportBuildFileGenerator
                             std::vector<std::string> &missingTargets)
 {
   for(std::vector<cmTarget*>::const_iterator
-        tei = this->Exports->begin();
-      tei != this->Exports->end(); ++tei)
+        tei = this->Exports.begin();
+      tei != this->Exports.end(); ++tei)
     {
     // Collect import properties for this target.
     cmTarget* target = *tei;

Source/cmExportBuildFileGenerator.h

@@ -30,8 +30,13 @@ public:
   cmExportBuildFileGenerator();
 
   /** Set the list of targets to export.  */
-  void SetExports(std::vector<cmTarget*> const* exports)
-    { this->Exports = exports; }
+  void SetTargets(std::vector<std::string> const& targets)
+    { this->Targets = targets; }
+  std::vector<std::string> const& GetTargets() const
+    { return this->Targets; }
+  void AppendTargets(std::vector<std::string> const& targets)
+    { this->Targets.insert(this->Targets.end(),
+      targets.begin(), targets.end()); }
 
   /** Set whether to append generated code to the output file.  */
   void SetAppendMode(bool append) { this->AppendMode = append; }
@@ -65,7 +70,8 @@ protected:
 
   std::string InstallNameDir(cmTarget* target, const std::string& config);
 
-  std::vector<cmTarget*> const* Exports;
+  std::vector<std::string> Targets;
+  std::vector<cmTarget*> Exports;
   cmMakefile* Makefile;
   cmListFileBacktrace Backtrace;
 };

Source/cmExportCommand.cxx

@@ -108,8 +108,6 @@ bool cmExportCommand
     fname += this->Filename.GetString();
     }
 
-  // Collect the targets to be exported.
-  std::vector<cmTarget*> targets;
   for(std::vector<std::string>::const_iterator
       currentTarget = this->Targets.GetVector().begin();
       currentTarget != this->Targets.GetVector().end();
@@ -128,15 +126,7 @@ bool cmExportCommand
        this->Makefile->GetLocalGenerator()->
        GetGlobalGenerator()->FindTarget(0, currentTarget->c_str()))
       {
-      if((target->GetType() == cmTarget::EXECUTABLE) ||
-         (target->GetType() == cmTarget::STATIC_LIBRARY) ||
-         (target->GetType() == cmTarget::SHARED_LIBRARY) ||
-         (target->GetType() == cmTarget::MODULE_LIBRARY) ||
-         (target->GetType() == cmTarget::INTERFACE_LIBRARY))
-        {
-        targets.push_back(target);
-        }
-      else if(target->GetType() == cmTarget::OBJECT_LIBRARY)
+      if(target->GetType() == cmTarget::OBJECT_LIBRARY)
         {
         cmOStringStream e;
         e << "given OBJECT library \"" << *currentTarget
@@ -144,37 +134,28 @@ bool cmExportCommand
         this->SetError(e.str().c_str());
         return false;
         }
-      else
-        {
-        cmOStringStream e;
-        e << "given target \"" << *currentTarget
-          << "\" which is not an executable or library.";
-        this->SetError(e.str().c_str());
-        return false;
       }
     }
-    else
+
+  cmGlobalGenerator *gg = this->Makefile->GetLocalGenerator()
+                                        ->GetGlobalGenerator();
+  if (this->Append.IsEnabled())
     {
-      cmOStringStream e;
-      e << "given target \"" << *currentTarget
-        << "\" which is not built by this project.";
-      this->SetError(e.str().c_str());
-      return false;
+    if (cmExportBuildFileGenerator *ebfg = gg->GetExportedTargetsFile(fname))
+      {
+      ebfg->AppendTargets(this->Targets.GetVector());
+      return true;
       }
     }
 
   // Setup export file generation.
-  cmExportBuildFileGenerator ebfg;
-  ebfg.SetExportFile(fname.c_str());
-  ebfg.SetNamespace(this->Namespace.GetCString());
-  ebfg.SetAppendMode(this->Append.IsEnabled());
-  ebfg.SetExports(&targets);
-  ebfg.SetMakefile(this->Makefile);
-  ebfg.SetExportOld(this->ExportOld.IsEnabled());
-
-  cmGlobalGenerator *gg = this->Makefile->GetLocalGenerator()
-                                        ->GetGlobalGenerator();
-  gg->AddExportedTargetsFile(fname);
+  cmExportBuildFileGenerator *ebfg = new cmExportBuildFileGenerator;
+  ebfg->SetExportFile(fname.c_str());
+  ebfg->SetNamespace(this->Namespace.GetCString());
+  ebfg->SetAppendMode(this->Append.IsEnabled());
+  ebfg->SetTargets(this->Targets.GetVector());
+  ebfg->SetMakefile(this->Makefile);
+  ebfg->SetExportOld(this->ExportOld.IsEnabled());
 
   // Compute the set of configurations exported.
   std::vector<std::string> configurationTypes;
@@ -185,27 +166,15 @@ bool cmExportCommand
           ci = configurationTypes.begin();
         ci != configurationTypes.end(); ++ci)
       {
-      ebfg.AddConfiguration(ci->c_str());
+      ebfg->AddConfiguration(ci->c_str());
       }
     }
   else
     {
-    ebfg.AddConfiguration("");
+    ebfg->AddConfiguration("");
     }
 
-  // Generate the import file.
-  if(!ebfg.GenerateImportFile() && this->ErrorMessage.empty())
-    {
-    this->SetError("could not write export file.");
-    return false;
-    }
-
-  // Report generated error message if any.
-  if(!this->ErrorMessage.empty())
-    {
-    this->SetError(this->ErrorMessage.c_str());
-    return false;
-    }
+  gg->AddBuildExportSet(ebfg);
 
   return true;
 }

Source/cmExportCommand.h

@@ -85,7 +85,9 @@ public:
       "should never be installed.  "
       "See the install(EXPORT) command to export targets from an "
       "installation tree."
-      CM_LOCATION_UNDEFINED_BEHAVIOR("passing it to this command")
+      "\n"
+      "The properties set on the generated IMPORTED targets will have the "
+      "same values as the final values of the input TARGETS."
       "\n"
       "  export(PACKAGE <name>)\n"
       "Store the current build directory in the CMake user package registry "

Source/cmExportFileGenerator.cxx

@@ -51,6 +51,12 @@ void cmExportFileGenerator::SetExportFile(const char* mainFile)
     cmSystemTools::GetFilenameLastExtension(this->MainImportFile);
 }
 
+//----------------------------------------------------------------------------
+const char* cmExportFileGenerator::GetMainExportFileName() const
+{
+  return this->MainImportFile.c_str();
+}
+
 //----------------------------------------------------------------------------
 bool cmExportFileGenerator::GenerateImportFile()
 {

Source/cmExportFileGenerator.h

@@ -33,9 +33,11 @@ public:
 
   /** Set the full path to the export file to generate.  */
   void SetExportFile(const char* mainFile);
+  const char *GetMainExportFileName() const;
 
   /** Set the namespace in which to place exported target names.  */
   void SetNamespace(const char* ns) { this->Namespace = ns; }
+  std::string GetNamespace() const { return this->Namespace; }
 
   void SetExportOld(bool exportOld) { this->ExportOld = exportOld; }
 

Source/cmGlobalGenerator.cxx

@@ -27,6 +27,7 @@
 #include "cmGeneratorTarget.h"
 #include "cmGeneratorExpression.h"
 #include "cmGeneratorExpressionEvaluationFile.h"
+#include "cmExportBuildFileGenerator.h"
 
 #include <cmsys/Directory.hxx>
 
@@ -77,6 +78,12 @@ cmGlobalGenerator::~cmGlobalGenerator()
     {
     delete *li;
     }
+  for(std::map<std::string, cmExportBuildFileGenerator*>::iterator
+        i = this->BuildExportSets.begin();
+      i != this->BuildExportSets.end(); ++i)
+    {
+    delete i->second;
+    }
   this->LocalGenerators.clear();
 
   if (this->ExtraGenerator)
@@ -183,6 +190,34 @@ void cmGlobalGenerator::ResolveLanguageCompiler(const std::string &lang,
                          doc.c_str(), cmCacheManager::FILEPATH);
 }
 
+void cmGlobalGenerator::AddBuildExportSet(cmExportBuildFileGenerator* gen)
+{
+  this->BuildExportSets[gen->GetMainExportFileName()] = gen;
+}
+
+bool cmGlobalGenerator::GenerateImportFile(const std::string &file)
+{
+  std::map<std::string, cmExportBuildFileGenerator*>::iterator it
+                                          = this->BuildExportSets.find(file);
+  if (it != this->BuildExportSets.end())
+    {
+    bool result = it->second->GenerateImportFile();
+    delete it->second;
+    it->second = 0;
+    this->BuildExportSets.erase(it);
+    return result;
+    }
+  return false;
+}
+
+bool
+cmGlobalGenerator::IsExportedTargetsFile(const std::string &filename) const
+{
+  const std::map<std::string, cmExportBuildFileGenerator*>::const_iterator it
+                                      = this->BuildExportSets.find(filename);
+  return it != this->BuildExportSets.end();
+}
+
 // Find the make program for the generator, required for try compiles
 void cmGlobalGenerator::FindMakeProgram(cmMakefile* mf)
 {
@@ -966,6 +1001,14 @@ void cmGlobalGenerator::Configure()
     }
 }
 
+cmExportBuildFileGenerator*
+cmGlobalGenerator::GetExportedTargetsFile(const std::string &filename) const
+{
+  std::map<std::string, cmExportBuildFileGenerator*>::const_iterator it
+    = this->BuildExportSets.find(filename);
+  return it == this->BuildExportSets.end() ? 0 : it->second;
+}
+
 bool cmGlobalGenerator::CheckALLOW_DUPLICATE_CUSTOM_TARGETS()
 {
   // If the property is not enabled then okay.
@@ -1091,6 +1134,19 @@ void cmGlobalGenerator::Generate()
     }
   this->SetCurrentLocalGenerator(0);
 
+  for (std::map<std::string, cmExportBuildFileGenerator*>::iterator
+      it = this->BuildExportSets.begin(); it != this->BuildExportSets.end();
+      ++it)
+    {
+    if (!it->second->GenerateImportFile()
+        && !cmSystemTools::GetErrorOccuredFlag())
+      {
+      this->GetCMakeInstance()
+          ->IssueMessage(cmake::FATAL_ERROR, "Could not write export file.",
+                        cmListFileBacktrace());
+      return;
+      }
+    }
   // Update rule hashes.
   this->CheckRuleHashes();
 

Source/cmGlobalGenerator.h

@@ -31,6 +31,7 @@ class cmExternalMakefileProjectGenerator;
 class cmTarget;
 class cmInstallTargetGenerator;
 class cmInstallFilesGenerator;
+class cmExportBuildFileGenerator;
 
 /** \class cmGlobalGenerator
  * \brief Responable for overseeing the generation process for the entire tree
@@ -293,18 +294,13 @@ public:
 
   void ProcessEvaluationFiles();
 
-  void AddExportedTargetsFile(const std::string &filename)
-  {
-    this->ExportedTargetsFiles.insert(filename);
-  }
-
-  bool IsExportedTargetsFile(const std::string &filename) const
-  {
-    const std::set<std::string>::const_iterator it
-                                  = this->ExportedTargetsFiles.find(filename);
-    return it != this->ExportedTargetsFiles.end();
-  }
-
+  std::map<std::string, cmExportBuildFileGenerator*>& GetBuildExportSets()
+    {return this->BuildExportSets;}
+  void AddBuildExportSet(cmExportBuildFileGenerator*);
+  bool IsExportedTargetsFile(const std::string &filename) const;
+  bool GenerateImportFile(const std::string &file);
+  cmExportBuildFileGenerator*
+  GetExportedTargetsFile(const std::string &filename) const;
 protected:
   typedef std::vector<cmLocalGenerator*> GeneratorVector;
   // for a project collect all its targets by following depend
@@ -356,6 +352,7 @@ protected:
   bool InstallTargetEnabled;
   // Sets of named target exports
   cmExportSetMap ExportSets;
+  std::map<std::string, cmExportBuildFileGenerator*> BuildExportSets;
 
   // Manifest of all targets that will be built for each configuration.
   // This is computed just before local generators generate.
@@ -384,7 +381,6 @@ private:
   std::map<cmStdString, cmStdString> ExtensionToLanguage;
   std::map<cmStdString, int> LanguageToLinkerPreference;
   std::map<cmStdString, cmStdString> LanguageToOriginalSharedLibFlags;
-  std::set<std::string> ExportedTargetsFiles;
 
   // Record hashes for rules and outputs.
   struct RuleHash { char Data[32]; };

Source/cmIncludeCommand.cxx

@@ -127,6 +127,7 @@ bool cmIncludeCommand
         return false;
         }
       }
+    gg->GenerateImportFile(fname_abs);
     }
 
   std::string fullFilePath;

Tests/RunCMake/CMP0022/CMP0022-export-stderr.txt

@@ -1,4 +1,4 @@
-CMake Error at CMP0022-export.cmake:11 \(export\):
+CMake Error in CMakeLists.txt:
   Target "cmp0022NEW" has policy CMP0022 enabled, but also has old-style
   LINK_INTERFACE_LIBRARIES properties populated, but it was exported without
   the EXPORT_LINK_INTERFACE_LIBRARIES to export the old-style properties

Tests/RunCMake/ExportWithoutLanguage/NoLanguage-stderr.txt

@@ -1,6 +1,4 @@
 CMake Error: CMake can not determine linker language for target: NoLanguage
-CMake Error at NoLanguage.cmake:2 \(export\):
+CMake Error in CMakeLists.txt:
   Exporting the target "NoLanguage" is not allowed since its linker language
   cannot be determined
-Call Stack \(most recent call first\):
-  CMakeLists.txt:3 \(include\)

Tests/RunCMake/ExportWithoutLanguage/header.h

@@ -0,0 +1,2 @@
+
+enum some_compilers { need_more_than_nothing };