Factor out generator checks for filtering out interface libraries

Add a `cmGeneratorTarget::IsInBuildSystem` helper method to tell
generators whether a target should participate in the generated build
system.

Source/cmComputeTargetDepends.cxx

@@ -184,7 +184,7 @@ void cmComputeTargetDepends::CollectTargetDepends(int depender_index)
 {
   // Get the depender.
   cmGeneratorTarget const* depender = this->Targets[depender_index];
-  if (depender->GetType() == cmStateEnums::INTERFACE_LIBRARY) {
+  if (!depender->IsInBuildSystem()) {
     return;
   }
 
@@ -356,10 +356,9 @@ void cmComputeTargetDepends::AddTargetDepend(
   int depender_index, cmGeneratorTarget const* dependee,
   cmListFileBacktrace const& dependee_backtrace, bool linking, bool cross)
 {
-  if (dependee->IsImported() ||
-      dependee->GetType() == cmStateEnums::INTERFACE_LIBRARY) {
-    // Skip IMPORTED and INTERFACE targets but follow their utility
-    // dependencies.
+  if (!dependee->IsInBuildSystem()) {
+    // Skip targets that are not in the buildsystem but follow their
+    // utility dependencies.
     std::set<cmLinkItem> const& utils = dependee->GetUtilityItems();
     for (cmLinkItem const& i : utils) {
       if (cmGeneratorTarget const* transitive_dependee = i.Target) {

Source/cmGeneratorTarget.cxx

@@ -1089,6 +1089,27 @@ std::vector<cmCustomCommand> const& cmGeneratorTarget::GetPostBuildCommands()
   return this->Target->GetPostBuildCommands();
 }
 
+bool cmGeneratorTarget::IsInBuildSystem() const
+{
+  if (this->IsImported()) {
+    return false;
+  }
+  switch (this->Target->GetType()) {
+    case cmStateEnums::EXECUTABLE:
+    case cmStateEnums::STATIC_LIBRARY:
+    case cmStateEnums::SHARED_LIBRARY:
+    case cmStateEnums::MODULE_LIBRARY:
+    case cmStateEnums::OBJECT_LIBRARY:
+    case cmStateEnums::UTILITY:
+    case cmStateEnums::GLOBAL_TARGET:
+      return true;
+    case cmStateEnums::INTERFACE_LIBRARY:
+    case cmStateEnums::UNKNOWN_LIBRARY:
+      break;
+  }
+  return false;
+}
+
 bool cmGeneratorTarget::IsImported() const
 {
   return this->Target->IsImported();
@@ -1365,7 +1386,7 @@ void AddSwiftImplicitIncludeDirectories(
 
     for (const cmLinkImplItem& library : libraries->Libraries) {
       if (const cmGeneratorTarget* dependency = library.Target) {
-        if (dependency->GetType() == cmStateEnums::INTERFACE_LIBRARY) {
+        if (!dependency->IsInBuildSystem()) {
           continue;
         }
         if (cm::contains(dependency->GetAllConfigCompileLanguages(),

Source/cmGeneratorTarget.h

@@ -45,6 +45,7 @@ public:
 
   cmGlobalGenerator* GetGlobalGenerator() const;
 
+  bool IsInBuildSystem() const;
   bool IsImported() const;
   bool IsImportedGloballyVisible() const;
   const std::string& GetLocation(const std::string& config) const;

Source/cmGlobalCommonGenerator.cxx

@@ -42,12 +42,7 @@ cmGlobalCommonGenerator::ComputeDirectoryTargets() const
     // for all targets in the directory.
     for (const auto& gt : lg->GetGeneratorTargets()) {
       cmStateEnums::TargetType const type = gt->GetType();
-      if (type != cmStateEnums::EXECUTABLE &&
-          type != cmStateEnums::STATIC_LIBRARY &&
-          type != cmStateEnums::SHARED_LIBRARY &&
-          type != cmStateEnums::MODULE_LIBRARY &&
-          type != cmStateEnums::OBJECT_LIBRARY &&
-          type != cmStateEnums::UTILITY) {
+      if (type == cmStateEnums::GLOBAL_TARGET || !gt->IsInBuildSystem()) {
         continue;
       }
       DirectoryTarget::Target t;

Source/cmGlobalGenerator.cxx

@@ -2165,7 +2165,7 @@ bool cmGlobalGenerator::IsExcluded(cmLocalGenerator* root,
 bool cmGlobalGenerator::IsExcluded(cmLocalGenerator* root,
                                    const cmGeneratorTarget* target) const
 {
-  if (target->GetType() == cmStateEnums::INTERFACE_LIBRARY) {
+  if (!target->IsInBuildSystem()) {
     return true;
   }
   cmMakefile* mf = root->GetMakefile();
@@ -3054,7 +3054,7 @@ void cmGlobalGenerator::WriteSummary()
 
   for (const auto& lg : this->LocalGenerators) {
     for (const auto& tgt : lg->GetGeneratorTargets()) {
-      if (tgt->GetType() == cmStateEnums::INTERFACE_LIBRARY) {
+      if (!tgt->IsInBuildSystem()) {
         continue;
       }
       this->WriteSummary(tgt.get());

Source/cmGlobalGhsMultiGenerator.cxx

@@ -467,7 +467,7 @@ void cmGlobalGhsMultiGenerator::WriteAllTarget(
     this->ProjectTargets.push_back(t);
   }
   for (cmGeneratorTarget const* t : sortedProjectTargets) {
-    if (t->GetType() == cmStateEnums::INTERFACE_LIBRARY) {
+    if (!t->IsInBuildSystem()) {
       continue;
     }
     if (!IsExcluded(t->GetLocalGenerator(), t)) {

Source/cmGlobalNinjaGenerator.cxx

@@ -1129,7 +1129,7 @@ void cmGlobalNinjaGenerator::AppendTargetDepends(
     cmNinjaDeps outs;
     for (cmTargetDepend const& targetDep :
          this->GetTargetDirectDepends(target)) {
-      if (targetDep->GetType() == cmStateEnums::INTERFACE_LIBRARY) {
+      if (!targetDep->IsInBuildSystem()) {
         continue;
       }
       if (targetDep.IsCross()) {
@@ -1171,7 +1171,7 @@ void cmGlobalNinjaGenerator::AppendTargetDependsClosure(
     cmNinjaOuts this_outs; // this will be the new cache entry
 
     for (auto const& dep_target : this->GetTargetDirectDepends(target)) {
-      if (dep_target->GetType() == cmStateEnums::INTERFACE_LIBRARY ||
+      if (!dep_target->IsInBuildSystem() ||
           (this->EnableCrossConfigBuild() && !dep_target.IsCross())) {
         continue;
       }

Source/cmGlobalUnixMakefileGenerator3.cxx

@@ -845,8 +845,7 @@ void cmGlobalUnixMakefileGenerator3::InitializeProgressMarks()
     for (const auto& gt : lg->GetGeneratorTargets()) {
       cmLocalGenerator* tlg = gt->GetLocalGenerator();
 
-      if (gt->GetType() == cmStateEnums::INTERFACE_LIBRARY ||
-          IsExcluded(lg.get(), gt.get())) {
+      if (!gt->IsInBuildSystem() || IsExcluded(lg.get(), gt.get())) {
         continue;
       }
 
@@ -881,7 +880,7 @@ size_t cmGlobalUnixMakefileGenerator3::CountProgressMarksInTarget(
   if (emitted.insert(target).second) {
     count = this->ProgressMap[target].Marks.size();
     for (cmTargetDepend const& depend : this->GetTargetDirectDepends(target)) {
-      if (depend->GetType() == cmStateEnums::INTERFACE_LIBRARY) {
+      if (!depend->IsInBuildSystem()) {
         continue;
       }
       count += this->CountProgressMarksInTarget(depend, emitted);
@@ -938,7 +937,7 @@ void cmGlobalUnixMakefileGenerator3::AppendGlobalTargetDepends(
   for (cmTargetDepend const& i : this->GetTargetDirectDepends(target)) {
     // Create the target-level dependency.
     cmGeneratorTarget const* dep = i;
-    if (dep->GetType() == cmStateEnums::INTERFACE_LIBRARY) {
+    if (!dep->IsInBuildSystem()) {
       continue;
     }
     cmLocalUnixMakefileGenerator3* lg3 =

Source/cmGlobalVisualStudio7Generator.cxx

@@ -339,7 +339,7 @@ void cmGlobalVisualStudio7Generator::WriteTargetConfigurations(
   // loop over again and write out configurations for each target
   // in the solution
   for (cmGeneratorTarget const* target : projectTargets) {
-    if (target->GetType() == cmStateEnums::INTERFACE_LIBRARY) {
+    if (!target->IsInBuildSystem()) {
       continue;
     }
     cmProp expath = target->GetProperty("EXTERNAL_MSPROJECT");
@@ -369,7 +369,7 @@ void cmGlobalVisualStudio7Generator::WriteTargetsToSolution(
 
   std::string rootBinaryDir = root->GetCurrentBinaryDirectory();
   for (cmGeneratorTarget const* target : projectTargets) {
-    if (target->GetType() == cmStateEnums::INTERFACE_LIBRARY) {
+    if (!target->IsInBuildSystem()) {
       continue;
     }
     bool written = false;
@@ -436,7 +436,7 @@ void cmGlobalVisualStudio7Generator::WriteTargetDepends(
   std::ostream& fout, OrderedTargetDependSet const& projectTargets)
 {
   for (cmGeneratorTarget const* target : projectTargets) {
-    if (target->GetType() == cmStateEnums::INTERFACE_LIBRARY) {
+    if (!target->IsInBuildSystem()) {
       continue;
     }
     cmProp vcprojName = target->GetProperty("GENERATOR_FILE_NAME");

Source/cmGlobalVisualStudio8Generator.cxx

@@ -325,7 +325,7 @@ void cmGlobalVisualStudio8Generator::WriteProjectDepends(
   TargetDependSet const& unordered = this->GetTargetDirectDepends(gt);
   OrderedTargetDependSet depends(unordered, std::string());
   for (cmTargetDepend const& i : depends) {
-    if (i->GetType() == cmStateEnums::INTERFACE_LIBRARY) {
+    if (!i->IsInBuildSystem()) {
       continue;
     }
     std::string guid = this->GetGUID(i->GetName());
@@ -341,7 +341,7 @@ bool cmGlobalVisualStudio8Generator::NeedLinkLibraryDependencies(
     if (cmGeneratorTarget* depTarget =
           target->GetLocalGenerator()->FindGeneratorTargetToUse(
             ui.Value.first)) {
-      if (depTarget->GetType() != cmStateEnums::INTERFACE_LIBRARY &&
+      if (depTarget->IsInBuildSystem() &&
           depTarget->GetProperty("EXTERNAL_MSPROJECT")) {
         // This utility dependency names an external .vcproj target.
         // We use LinkLibraryDependencies="true" to link to it without

Source/cmGlobalVisualStudioGenerator.cxx

@@ -368,7 +368,7 @@ cmGlobalVisualStudioGenerator::GetTargetLinkClosure(cmGeneratorTarget* target)
 void cmGlobalVisualStudioGenerator::FollowLinkDepends(
   const cmGeneratorTarget* target, std::set<const cmGeneratorTarget*>& linked)
 {
-  if (target->GetType() == cmStateEnums::INTERFACE_LIBRARY) {
+  if (!target->IsInBuildSystem()) {
     return;
   }
   if (linked.insert(target).second &&

Source/cmGlobalXCodeGenerator.cxx

@@ -1199,7 +1199,7 @@ bool cmGlobalXCodeGenerator::CreateXCodeTarget(
     return true;
   }
 
-  if (gtgt->GetType() == cmStateEnums::INTERFACE_LIBRARY) {
+  if (!gtgt->IsInBuildSystem()) {
     return true;
   }
 
@@ -1845,7 +1845,7 @@ void cmGlobalXCodeGenerator::CreateBuildSettings(cmGeneratorTarget* gtgt,
                                                  cmXCodeObject* buildSettings,
                                                  const std::string& configName)
 {
-  if (gtgt->GetType() == cmStateEnums::INTERFACE_LIBRARY) {
+  if (!gtgt->IsInBuildSystem()) {
     return;
   }
 
@@ -2678,7 +2678,7 @@ const char* cmGlobalXCodeGenerator::GetTargetProductType(
 cmXCodeObject* cmGlobalXCodeGenerator::CreateXCodeTarget(
   cmGeneratorTarget* gtgt, cmXCodeObject* buildPhases)
 {
-  if (gtgt->GetType() == cmStateEnums::INTERFACE_LIBRARY) {
+  if (!gtgt->IsInBuildSystem()) {
     return nullptr;
   }
   cmXCodeObject* target = this->CreateObject(cmXCodeObject::PBXNativeTarget);
@@ -2821,7 +2821,7 @@ void cmGlobalXCodeGenerator::AddDependAndLinkInformation(cmXCodeObject* target)
     cmSystemTools::Error("Error no target on xobject\n");
     return;
   }
-  if (gt->GetType() == cmStateEnums::INTERFACE_LIBRARY) {
+  if (!gt->IsInBuildSystem()) {
     return;
   }
 
@@ -3113,13 +3113,9 @@ bool cmGlobalXCodeGenerator::CreateGroups(
       // end up with (empty anyhow) ZERO_CHECK, install, or test source
       // groups:
       //
-      if (gtgt->GetType() == cmStateEnums::GLOBAL_TARGET) {
-        continue;
-      }
-      if (gtgt->GetType() == cmStateEnums::INTERFACE_LIBRARY) {
-        continue;
-      }
-      if (gtgt->GetName() == CMAKE_CHECK_BUILD_SYSTEM_TARGET) {
+      if (!gtgt->IsInBuildSystem() ||
+          gtgt->GetType() == cmStateEnums::GLOBAL_TARGET ||
+          gtgt->GetName() == CMAKE_CHECK_BUILD_SYSTEM_TARGET) {
         continue;
       }
 

Source/cmLocalGenerator.cxx

@@ -284,7 +284,7 @@ void cmLocalGenerator::TraceDependencies()
   // Generate the rule files for each target.
   const auto& targets = this->GetGeneratorTargets();
   for (const auto& target : targets) {
-    if (target->GetType() == cmStateEnums::INTERFACE_LIBRARY) {
+    if (!target->IsInBuildSystem()) {
       continue;
     }
     target->TraceDependencies();
@@ -760,7 +760,7 @@ void cmLocalGenerator::ComputeTargetManifest()
   // Add our targets to the manifest for each configuration.
   const auto& targets = this->GetGeneratorTargets();
   for (const auto& target : targets) {
-    if (target->GetType() == cmStateEnums::INTERFACE_LIBRARY) {
+    if (!target->IsInBuildSystem()) {
       continue;
     }
     for (std::string const& c : configNames) {

Source/cmLocalGhsMultiGenerator.cxx

@@ -11,7 +11,6 @@
 #include "cmGhsMultiTargetGenerator.h"
 #include "cmGlobalGenerator.h"
 #include "cmSourceFile.h"
-#include "cmStateTypes.h"
 #include "cmStringAlgorithms.h"
 #include "cmSystemTools.h"
 
@@ -33,7 +32,7 @@ std::string cmLocalGhsMultiGenerator::GetTargetDirectory(
 void cmLocalGhsMultiGenerator::GenerateTargetsDepthFirst(
   cmGeneratorTarget* target, std::vector<cmGeneratorTarget*>& remaining)
 {
-  if (target->GetType() == cmStateEnums::INTERFACE_LIBRARY) {
+  if (!target->IsInBuildSystem()) {
     return;
   }
   // Find this target in the list of remaining targets.

Source/cmLocalNinjaGenerator.cxx

@@ -90,7 +90,7 @@ void cmLocalNinjaGenerator::Generate()
   }
 
   for (const auto& target : this->GetGeneratorTargets()) {
-    if (target->GetType() == cmStateEnums::INTERFACE_LIBRARY) {
+    if (!target->IsInBuildSystem()) {
       continue;
     }
     auto tg = cmNinjaTargetGenerator::New(target.get());

Source/cmLocalUnixMakefileGenerator3.cxx

@@ -101,7 +101,7 @@ void cmLocalUnixMakefileGenerator3::Generate()
   cmGlobalUnixMakefileGenerator3* gg =
     static_cast<cmGlobalUnixMakefileGenerator3*>(this->GlobalGenerator);
   for (const auto& target : this->GetGeneratorTargets()) {
-    if (target->GetType() == cmStateEnums::INTERFACE_LIBRARY) {
+    if (!target->IsInBuildSystem()) {
       continue;
     }
     std::unique_ptr<cmMakefileTargetGenerator> tg(

Source/cmLocalVisualStudio10Generator.cxx

@@ -69,7 +69,7 @@ cmLocalVisualStudio10Generator::~cmLocalVisualStudio10Generator()
 void cmLocalVisualStudio10Generator::GenerateTargetsDepthFirst(
   cmGeneratorTarget* target, std::vector<cmGeneratorTarget*>& remaining)
 {
-  if (target->GetType() == cmStateEnums::INTERFACE_LIBRARY) {
+  if (!target->IsInBuildSystem()) {
     return;
   }
   // Find this target in the list of remaining targets.

Source/cmLocalVisualStudio7Generator.cxx

@@ -66,7 +66,7 @@ void cmLocalVisualStudio7Generator::AddHelperCommands()
   // Now create GUIDs for targets
   const auto& tgts = this->GetGeneratorTargets();
   for (const auto& l : tgts) {
-    if (l->GetType() == cmStateEnums::INTERFACE_LIBRARY) {
+    if (!l->IsInBuildSystem()) {
       continue;
     }
     cmProp path = l->GetProperty("EXTERNAL_MSPROJECT");
@@ -129,7 +129,7 @@ void cmLocalVisualStudio7Generator::WriteProjectFiles()
 
   // Create the project file for each target.
   for (const auto& l : tgts) {
-    if (l->GetType() == cmStateEnums::INTERFACE_LIBRARY) {
+    if (!l->IsInBuildSystem()) {
       continue;
     }
     // INCLUDE_EXTERNAL_MSPROJECT command only affects the workspace

Source/cmVisualStudio10TargetGenerator.cxx

@@ -4138,7 +4138,7 @@ void cmVisualStudio10TargetGenerator::WriteProjectReferences(Elem& e0)
   Elem e1(e0, "ItemGroup");
   e1.SetHasElements();
   for (cmGeneratorTarget const* dt : depends) {
-    if (dt->GetType() == cmStateEnums::INTERFACE_LIBRARY) {
+    if (!dt->IsInBuildSystem()) {
       continue;
     }
     // skip fortran targets as they can not be processed by MSBuild