Merge topic 'cxxmodules-refactor-detection-support'

e37ff5694c cmGeneratorTarget: factor out fileset info and scanning detection
9e61fc3d6d cmGeneratorTarget: factor out dyndep support detection
5e026739e1 cmGlobalGenerator: factor out C++ module support checking

Acked-by: Kitware Robot <kwrobot@kitware.com>
Tested-by: buildbot <buildbot@kitware.com>
Merge-request: !7951

8 files changed, 147 insertions, 128 deletions

diff --git a/Source/cmGeneratorTarget.cxx b/Source/cmGeneratorTarget.cxx
index fae6d54..27e31d4 100644
--- a/Source/cmGeneratorTarget.cxx
+++ b/Source/cmGeneratorTarget.cxx
@@ -8869,3 +8869,101 @@ void cmGeneratorTarget::CheckCxxModuleStatus(std::string const& config) const
     }
   }
 }
+
+bool cmGeneratorTarget::NeedCxxModuleSupport(std::string const& lang,
+                                             std::string const& config) const
+{
+  if (lang != "CXX"_s) {
+    return false;
+  }
+  return this->HaveCxxModuleSupport(config) == Cxx20SupportLevel::Supported &&
+    this->GetGlobalGenerator()->CheckCxxModuleSupport();
+}
+
+bool cmGeneratorTarget::NeedDyndep(std::string const& lang,
+                                   std::string const& config) const
+{
+  return lang == "Fortran"_s || this->NeedCxxModuleSupport(lang, config);
+}
+
+cmFileSet const* cmGeneratorTarget::GetFileSetForSource(
+  std::string const& config, cmSourceFile const* sf) const
+{
+  this->BuildFileSetInfoCache(config);
+
+  auto const& path = sf->GetFullPath();
+  auto const& per_config = this->Configs[config];
+
+  auto const fsit = per_config.FileSetCache.find(path);
+  if (fsit == per_config.FileSetCache.end()) {
+    return nullptr;
+  }
+  return fsit->second;
+}
+
+bool cmGeneratorTarget::NeedDyndepForSource(std::string const& lang,
+                                            std::string const& config,
+                                            cmSourceFile const* sf) const
+{
+  bool const needDyndep = this->NeedDyndep(lang, config);
+  if (!needDyndep) {
+    return false;
+  }
+  auto const* fs = this->GetFileSetForSource(config, sf);
+  if (fs &&
+      (fs->GetType() == "CXX_MODULES"_s ||
+       fs->GetType() == "CXX_MODULE_HEADER_UNITS"_s)) {
+    return true;
+  }
+  auto const sfProp = sf->GetProperty("CXX_SCAN_FOR_MODULES");
+  if (sfProp.IsSet()) {
+    return sfProp.IsOn();
+  }
+  auto const tgtProp = this->GetProperty("CXX_SCAN_FOR_MODULES");
+  if (tgtProp.IsSet()) {
+    return tgtProp.IsOn();
+  }
+  return true;
+}
+
+void cmGeneratorTarget::BuildFileSetInfoCache(std::string const& config) const
+{
+  auto& per_config = this->Configs[config];
+
+  if (per_config.BuiltFileSetCache) {
+    return;
+  }
+
+  auto const* tgt = this->Target;
+
+  for (auto const& name : tgt->GetAllFileSetNames()) {
+    auto const* file_set = tgt->GetFileSet(name);
+    if (!file_set) {
+      tgt->GetMakefile()->IssueMessage(
+        MessageType::INTERNAL_ERROR,
+        cmStrCat("Target \"", tgt->GetName(),
+                 "\" is tracked to have file set \"", name,
+                 "\", but it was not found."));
+      continue;
+    }
+
+    auto fileEntries = file_set->CompileFileEntries();
+    auto directoryEntries = file_set->CompileDirectoryEntries();
+    auto directories = file_set->EvaluateDirectoryEntries(
+      directoryEntries, this->LocalGenerator, config, this);
+
+    std::map<std::string, std::vector<std::string>> files;
+    for (auto const& entry : fileEntries) {
+      file_set->EvaluateFileEntry(directories, files, entry,
+                                  this->LocalGenerator, config, this);
+    }
+
+    for (auto const& it : files) {
+      for (auto const& filename : it.second) {
+        per_config.FileSetCache[filename] = file_set;
+      }
+    }
+  }
+
+  per_config.BuiltFileSetCache = true;
+}
diff --git a/Source/cmGeneratorTarget.h b/Source/cmGeneratorTarget.h
index 25e6a81..96eda2c 100644
--- a/Source/cmGeneratorTarget.h
+++ b/Source/cmGeneratorTarget.h
@@ -26,6 +26,7 @@
 enum class cmBuildStep;
 class cmComputeLinkInformation;
 class cmCustomCommand;
+class cmFileSet;
 class cmGlobalGenerator;
 class cmLocalGenerator;
 class cmMakefile;
@@ -1229,4 +1230,21 @@ public:
 
   // Check C++ module status for the target.
   void CheckCxxModuleStatus(std::string const& config) const;
+
+  bool NeedCxxModuleSupport(std::string const& lang,
+                            std::string const& config) const;
+  bool NeedDyndep(std::string const& lang, std::string const& config) const;
+  cmFileSet const* GetFileSetForSource(std::string const& config,
+                                       cmSourceFile const* sf) const;
+  bool NeedDyndepForSource(std::string const& lang, std::string const& config,
+                           cmSourceFile const* sf) const;
+
+private:
+  void BuildFileSetInfoCache(std::string const& config) const;
+  struct InfoByConfig
+  {
+    bool BuiltFileSetCache = false;
+    std::map<std::string, cmFileSet const*> FileSetCache;
+  };
+  mutable std::map<std::string, InfoByConfig> Configs;
 };
diff --git a/Source/cmGlobalGenerator.cxx b/Source/cmGlobalGenerator.cxx
index a9485b5..8ca6ee6 100644
--- a/Source/cmGlobalGenerator.cxx
+++ b/Source/cmGlobalGenerator.cxx
@@ -1439,6 +1439,19 @@ bool cmGlobalGenerator::CheckALLOW_DUPLICATE_CUSTOM_TARGETS() const
   return false;
 }
 
+void cmGlobalGenerator::CxxModuleSupportCheck() const
+{
+  bool const diagnose = !this->DiagnosedCxxModuleSupport &&
+    !this->CMakeInstance->GetIsInTryCompile();
+  if (diagnose) {
+    this->DiagnosedCxxModuleSupport = true;
+    this->GetCMakeInstance()->IssueMessage(
+      MessageType::AUTHOR_WARNING,
+      "C++20 modules support via CMAKE_EXPERIMENTAL_CXX_MODULE_DYNDEP "
+      "is experimental.  It is meant only for compiler developers to try.");
+  }
+}
+
 void cmGlobalGenerator::ComputeBuildFileGenerators()
 {
   for (unsigned int i = 0; i < this->LocalGenerators.size(); ++i) {
@@ -1597,6 +1610,8 @@ void cmGlobalGenerator::Generate()
   // it builds by default.
   this->InitializeProgressMarks();
 
+  this->DiagnosedCxxModuleSupport = false;
+
   this->ProcessEvaluationFiles();
 
   this->CMakeInstance->UpdateProgress("Generating", 0.1f);
diff --git a/Source/cmGlobalGenerator.h b/Source/cmGlobalGenerator.h
index 89b2ea8..4ebf9f6 100644
--- a/Source/cmGlobalGenerator.h
+++ b/Source/cmGlobalGenerator.h
@@ -157,6 +157,8 @@ public:
 
   virtual bool InspectConfigTypeVariables() { return true; }
 
+  virtual bool CheckCxxModuleSupport() { return false; }
+
   bool Compute();
   virtual void AddExtraIDETargets() {}
 
@@ -621,6 +623,8 @@ protected:
 
   virtual bool CheckALLOW_DUPLICATE_CUSTOM_TARGETS() const;
 
+  void CxxModuleSupportCheck() const;
+
   /// @brief Qt AUTOMOC/UIC/RCC target generation
   /// @return true on success
   bool QtAutoGen();
@@ -728,6 +732,8 @@ private:
   std::map<std::string, int> LanguageToLinkerPreference;
   std::map<std::string, std::string> LanguageToOriginalSharedLibFlags;
 
+  mutable bool DiagnosedCxxModuleSupport = false;
+
   // Deferral id generation.
   size_t NextDeferId = 0;
 
diff --git a/Source/cmGlobalNinjaGenerator.cxx b/Source/cmGlobalNinjaGenerator.cxx
index e334666..618dfb7 100644
--- a/Source/cmGlobalNinjaGenerator.cxx
+++ b/Source/cmGlobalNinjaGenerator.cxx
@@ -591,7 +591,7 @@ void cmGlobalNinjaGenerator::Generate()
   this->TargetAll = this->NinjaOutputPath("all");
   this->CMakeCacheFile = this->NinjaOutputPath("CMakeCache.txt");
   this->DisableCleandead = false;
-  this->DiagnosedCxxModuleSupport = false;
+  this->DiagnosedCxxModuleNinjaSupport = false;
 
   this->PolicyCMP0058 =
     this->LocalGenerators[0]->GetMakefile()->GetPolicyStatus(
@@ -850,18 +850,12 @@ bool cmGlobalNinjaGenerator::CheckLanguages(
 
 bool cmGlobalNinjaGenerator::CheckCxxModuleSupport()
 {
-  bool const diagnose = !this->DiagnosedCxxModuleSupport &&
-    !this->CMakeInstance->GetIsInTryCompile();
-  if (diagnose) {
-    this->DiagnosedCxxModuleSupport = true;
-    this->GetCMakeInstance()->IssueMessage(
-      MessageType::AUTHOR_WARNING,
-      "C++20 modules support via CMAKE_EXPERIMENTAL_CXX_MODULE_DYNDEP "
-      "is experimental.  It is meant only for compiler developers to try.");
-  }
+  this->CxxModuleSupportCheck();
   if (this->NinjaSupportsDyndeps) {
     return true;
   }
+  bool const diagnose = !this->DiagnosedCxxModuleNinjaSupport &&
+    !this->CMakeInstance->GetIsInTryCompile();
   if (diagnose) {
     std::ostringstream e;
     /* clang-format off */
diff --git a/Source/cmGlobalNinjaGenerator.h b/Source/cmGlobalNinjaGenerator.h
index 1628349..6f654f6 100644
--- a/Source/cmGlobalNinjaGenerator.h
+++ b/Source/cmGlobalNinjaGenerator.h
@@ -469,7 +469,7 @@ public:
 
   bool IsSingleConfigUtility(cmGeneratorTarget const* target) const;
 
-  bool CheckCxxModuleSupport();
+  bool CheckCxxModuleSupport() override;
 
 protected:
   void Generate() override;
@@ -592,7 +592,7 @@ private:
 
   codecvt::Encoding NinjaExpectedEncoding = codecvt::None;
 
-  bool DiagnosedCxxModuleSupport = false;
+  bool DiagnosedCxxModuleNinjaSupport = false;
 
   void InitOutputPathPrefix();
 
diff --git a/Source/cmNinjaTargetGenerator.cxx b/Source/cmNinjaTargetGenerator.cxx
index d39e155..095bf40 100644
--- a/Source/cmNinjaTargetGenerator.cxx
+++ b/Source/cmNinjaTargetGenerator.cxx
@@ -157,107 +157,6 @@ std::string cmNinjaTargetGenerator::LanguageDyndepRule(
     '_', config);
 }
 
-bool cmNinjaTargetGenerator::NeedCxxModuleSupport(
-  std::string const& lang, std::string const& config) const
-{
-  if (lang != "CXX"_s) {
-    return false;
-  }
-  return this->GetGeneratorTarget()->HaveCxxModuleSupport(config) ==
-    cmGeneratorTarget::Cxx20SupportLevel::Supported &&
-    this->GetGlobalGenerator()->CheckCxxModuleSupport();
-}
-
-bool cmNinjaTargetGenerator::NeedDyndep(std::string const& lang,
-                                        std::string const& config) const
-{
-  return lang == "Fortran" || this->NeedCxxModuleSupport(lang, config);
-}
-
-void cmNinjaTargetGenerator::BuildFileSetInfoCache(std::string const& config)
-{
-  auto& per_config = this->Configs[config];
-
-  if (per_config.BuiltFileSetCache) {
-    return;
-  }
-
-  auto const* tgt = this->GeneratorTarget->Target;
-
-  for (auto const& name : tgt->GetAllFileSetNames()) {
-    auto const* file_set = tgt->GetFileSet(name);
-    if (!file_set) {
-      this->GetMakefile()->IssueMessage(
-        MessageType::INTERNAL_ERROR,
-        cmStrCat("Target \"", tgt->GetName(),
-                 "\" is tracked to have file set \"", name,
-                 "\", but it was not found."));
-      continue;
-    }
-
-    auto fileEntries = file_set->CompileFileEntries();
-    auto directoryEntries = file_set->CompileDirectoryEntries();
-    auto directories = file_set->EvaluateDirectoryEntries(
-      directoryEntries, this->LocalGenerator, config, this->GeneratorTarget);
-
-    std::map<std::string, std::vector<std::string>> files;
-    for (auto const& entry : fileEntries) {
-      file_set->EvaluateFileEntry(directories, files, entry,
-                                  this->LocalGenerator, config,
-                                  this->GeneratorTarget);
-    }
-
-    for (auto const& it : files) {
-      for (auto const& filename : it.second) {
-        per_config.FileSetCache[filename] = file_set;
-      }
-    }
-  }
-
-  per_config.BuiltFileSetCache = true;
-}
-
-cmFileSet const* cmNinjaTargetGenerator::GetFileSetForSource(
-  std::string const& config, cmSourceFile const* sf)
-{
-  this->BuildFileSetInfoCache(config);
-
-  auto const& path = sf->GetFullPath();
-  auto const& per_config = this->Configs[config];
-
-  auto const fsit = per_config.FileSetCache.find(path);
-  if (fsit == per_config.FileSetCache.end()) {
-    return nullptr;
-  }
-  return fsit->second;
-}
-
-bool cmNinjaTargetGenerator::NeedDyndepForSource(std::string const& lang,
-                                                 std::string const& config,
-                                                 cmSourceFile const* sf)
-{
-  bool const needDyndep = this->NeedDyndep(lang, config);
-  if (!needDyndep) {
-    return false;
-  }
-  auto const* fs = this->GetFileSetForSource(config, sf);
-  if (fs &&
-      (fs->GetType() == "CXX_MODULES"_s ||
-       fs->GetType() == "CXX_MODULE_HEADER_UNITS"_s)) {
-    return true;
-  }
-  auto const sfProp = sf->GetProperty("CXX_SCAN_FOR_MODULES");
-  if (sfProp.IsSet()) {
-    return sfProp.IsOn();
-  }
-  auto const tgtProp =
-    this->GeneratorTarget->GetProperty("CXX_SCAN_FOR_MODULES");
-  if (tgtProp.IsSet()) {
-    return tgtProp.IsOn();
-  }
-  return true;
-}
-
 std::string cmNinjaTargetGenerator::OrderDependsTargetForTarget(
   const std::string& config)
 {
@@ -341,7 +240,7 @@ std::string cmNinjaTargetGenerator::ComputeFlagsForObject(
       flags, genexInterpreter.Evaluate(pchOptions, COMPILE_OPTIONS));
   }
 
-  auto const* fs = this->GetFileSetForSource(config, source);
+  auto const* fs = this->GeneratorTarget->GetFileSetForSource(config, source);
   if (fs &&
       (fs->GetType() == "CXX_MODULES"_s ||
        fs->GetType() == "CXX_MODULE_HEADER_UNITS"_s)) {
@@ -699,7 +598,7 @@ void cmNinjaTargetGenerator::WriteCompileRule(const std::string& lang,
                                               const std::string& config)
 {
   // For some cases we scan to dynamically discover dependencies.
-  bool const needDyndep = this->NeedDyndep(lang, config);
+  bool const needDyndep = this->GetGeneratorTarget()->NeedDyndep(lang, config);
 
   if (needDyndep) {
     this->WriteCompileRule(lang, config, WithScanning::Yes);
@@ -1387,7 +1286,8 @@ void cmNinjaTargetGenerator::WriteObjectBuildStatement(
     !(language == "RC" || (language == "CUDA" && !flag));
   int const commandLineLengthLimit =
     ((lang_supports_response && this->ForceResponseFile())) ? -1 : 0;
-  bool const needDyndep = this->NeedDyndepForSource(language, config, source);
+  bool const needDyndep =
+    this->GeneratorTarget->NeedDyndepForSource(language, config, source);
 
   cmNinjaBuild objBuild(this->LanguageCompilerRule(
     language, config, needDyndep ? WithScanning::Yes : WithScanning::No));
diff --git a/Source/cmNinjaTargetGenerator.h b/Source/cmNinjaTargetGenerator.h
index d09f04b..b5abb36 100644
--- a/Source/cmNinjaTargetGenerator.h
+++ b/Source/cmNinjaTargetGenerator.h
@@ -19,7 +19,6 @@
 #include "cmOSXBundleGenerator.h"
 
 class cmCustomCommand;
-class cmFileSet;
 class cmGeneratedFileStream;
 class cmGeneratorTarget;
 class cmLocalNinjaGenerator;
@@ -64,10 +63,6 @@ protected:
 
   cmMakefile* GetMakefile() const { return this->Makefile; }
 
-  void BuildFileSetInfoCache(std::string const& config);
-  cmFileSet const* GetFileSetForSource(std::string const& config,
-                                       cmSourceFile const* sf);
-
   enum class WithScanning
   {
     No,
@@ -82,13 +77,8 @@ protected:
                                const std::string& config) const;
   std::string LanguageDyndepRule(std::string const& lang,
                                  const std::string& config) const;
-  bool NeedDyndep(std::string const& lang, std::string const& config) const;
-  bool NeedDyndepForSource(std::string const& lang, std::string const& config,
-                           cmSourceFile const* sf);
   bool NeedExplicitPreprocessing(std::string const& lang) const;
   bool CompileWithDefines(std::string const& lang) const;
-  bool NeedCxxModuleSupport(std::string const& lang,
-                            std::string const& config) const;
 
   std::string OrderDependsTargetForTarget(const std::string& config);
 
@@ -238,8 +228,6 @@ private:
     std::vector<cmCustomCommand const*> CustomCommands;
     cmNinjaDeps ExtraFiles;
     std::unique_ptr<MacOSXContentGeneratorType> MacOSXContentGenerator;
-    bool BuiltFileSetCache = false;
-    std::map<std::string, cmFileSet const*> FileSetCache;
   };
 
   std::map<std::string, ByConfig> Configs;