Refactor cmTargetExport removing InterfaceIncludeDirecories

Because of this property in the cmTargetExport struct, exporting targets
is not uniform: top-level ones have to be dealt with via the
cmTargetExport objects, while all linked ones are cmGeneratorTarget
objects. Let's pass this additional includedirectories via a special
target property making handling exported targets uniform.

Source/cmExportFileGenerator.cxx

@@ -378,7 +378,8 @@ void cmExportFileGenerator::PopulateIncludeDirectoriesInterface(
   cmGeneratorExpression ge;
 
   std::string dirs = cmGeneratorExpression::Preprocess(
-    tei->InterfaceIncludeDirectories, preprocessRule, true);
+    cmJoin(target->Target->GetInstallIncludeDirectoriesEntries(), ";"),
+    preprocessRule, true);
   this->ReplaceInstallPrefix(dirs);
   std::unique_ptr<cmCompiledGeneratorExpression> cge = ge.Parse(dirs);
   std::string exportDirs =

Source/cmInstallCommand.cxx

@@ -36,6 +36,7 @@
 #include "cmMessageType.h"
 #include "cmPolicies.h"
 #include "cmProperty.h"
+#include "cmRange.h"
 #include "cmRuntimeDependencyArchive.h"
 #include "cmStateTypes.h"
 #include "cmStringAlgorithms.h"
@@ -681,8 +682,8 @@ bool HandleTargetsMode(std::vector<std::string> const& args,
         te->LibraryGenerator = libraryGenerator.get();
         te->RuntimeGenerator = runtimeGenerator.get();
         te->ObjectsGenerator = objectGenerator.get();
-        te->InterfaceIncludeDirectories =
+        target.AddInstallIncludeDirectories(
-          cmJoin(includesArgs.GetIncludeDirs(), ";");
+          cmMakeRange(includesArgs.GetIncludeDirs()));
         te->NamelinkOnly = namelinkOnly;
         helper.Makefile->GetGlobalGenerator()
           ->GetExportSets()[exports]

Source/cmTarget.cxx

@@ -189,6 +189,7 @@ public:
   std::map<std::string, BTs<std::string>> LanguageStandardProperties;
   std::vector<std::string> IncludeDirectoriesEntries;
   std::vector<cmListFileBacktrace> IncludeDirectoriesBacktraces;
+  std::vector<std::string> InstallIncludeDirectoriesEntries;
   std::vector<std::string> CompileOptionsEntries;
   std::vector<cmListFileBacktrace> CompileOptionsBacktraces;
   std::vector<std::string> CompileFeaturesEntries;
@@ -1075,6 +1076,17 @@ std::set<std::string> const& cmTarget::GetSystemIncludeDirectories() const
   return this->impl->SystemIncludeDirectories;
 }
 
+void cmTarget::AddInstallIncludeDirectories(cmStringRange const& incs)
+{
+  std::copy(incs.begin(), incs.end(),
+            std::back_inserter(this->impl->InstallIncludeDirectoriesEntries));
+}
+
+cmStringRange cmTarget::GetInstallIncludeDirectoriesEntries() const
+{
+  return cmMakeRange(this->impl->InstallIncludeDirectoriesEntries);
+}
+
 cmStringRange cmTarget::GetIncludeDirectoriesEntries() const
 {
   return cmMakeRange(this->impl->IncludeDirectoriesEntries);

Source/cmTarget.h

@@ -237,6 +237,9 @@ public:
   void AddSystemIncludeDirectories(std::set<std::string> const& incs);
   std::set<std::string> const& GetSystemIncludeDirectories() const;
 
+  void AddInstallIncludeDirectories(cmStringRange const& incs);
+  cmStringRange GetInstallIncludeDirectoriesEntries() const;
+
   BTs<std::string> const* GetLanguageStandardProperty(
     const std::string& propertyName) const;
 

Source/cmTargetExport.h

@@ -29,7 +29,6 @@ public:
   cmInstallTargetGenerator* FrameworkGenerator;
   cmInstallTargetGenerator* BundleGenerator;
   cmInstallFilesGenerator* HeaderGenerator;
-  std::string InterfaceIncludeDirectories;
   ///@}
 
   bool NamelinkOnly = false;