1 files changed, 108 insertions, 0 deletions
diff --git a/Source/cmIncludeGuardCommand.cxx b/Source/cmIncludeGuardCommand.cxx
new file mode 100644
index 0000000..505b07c
--- /dev/null
+++ b/Source/cmIncludeGuardCommand.cxx
@@ -0,0 +1,108 @@
+/* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+   file Copyright.txt or https://cmake.org/licensing for details.  */
+#include "cmIncludeGuardCommand.h"
+
+#include "cmExecutionStatus.h"
+#include "cmMakefile.h"
+#include "cmStateDirectory.h"
+#include "cmStateSnapshot.h"
+#include "cmSystemTools.h"
+#include "cmake.h"
+
+namespace {
+
+enum IncludeGuardScope
+{
+  VARIABLE,
+  DIRECTORY,
+  GLOBAL
+};
+
+std::string GetIncludeGuardVariableName(std::string const& filePath)
+{
+  std::string result = "__INCGUARD_";
+#ifdef CMAKE_BUILD_WITH_CMAKE
+  result += cmSystemTools::ComputeStringMD5(filePath);
+#else
+  result += cmSystemTools::MakeCidentifier(filePath);
+#endif
+  result += "__";
+  return result;
+}
+
+bool CheckIncludeGuardIsSet(cmMakefile* mf, std::string const& includeGuardVar)
+{
+  if (mf->GetProperty(includeGuardVar)) {
+    return true;
+  }
+  cmStateSnapshot dirSnapshot =
+    mf->GetStateSnapshot().GetBuildsystemDirectoryParent();
+  while (dirSnapshot.GetState()) {
+    cmStateDirectory stateDir = dirSnapshot.GetDirectory();
+    if (stateDir.GetProperty(includeGuardVar)) {
+      return true;
+    }
+    dirSnapshot = dirSnapshot.GetBuildsystemDirectoryParent();
+  }
+  return false;
+}
+
+} // anonymous namespace
+
+// cmIncludeGuardCommand
+bool cmIncludeGuardCommand::InitialPass(std::vector<std::string> const& args,
+                                        cmExecutionStatus& status)
+{
+  if (args.size() > 1) {
+    this->SetError(
+      "given an invalid number of arguments. The command takes at "
+      "most 1 argument.");
+    return false;
+  }
+
+  IncludeGuardScope scope = VARIABLE;
+
+  if (!args.empty()) {
+    std::string const& arg = args[0];
+    if (arg == "DIRECTORY") {
+      scope = DIRECTORY;
+    } else if (arg == "GLOBAL") {
+      scope = GLOBAL;
+    } else {
+      this->SetError("given an invalid scope: " + arg);
+      return false;
+    }
+  }
+
+  std::string includeGuardVar = GetIncludeGuardVariableName(
+    this->Makefile->GetDefinition("CMAKE_CURRENT_LIST_FILE"));
+
+  cmMakefile* const mf = this->Makefile;
+
+  switch (scope) {
+    case VARIABLE:
+      if (mf->IsDefinitionSet(includeGuardVar)) {
+        status.SetReturnInvoked();
+        return true;
+      }
+      mf->AddDefinition(includeGuardVar, true);
+      break;
+    case DIRECTORY:
+      if (CheckIncludeGuardIsSet(mf, includeGuardVar)) {
+        status.SetReturnInvoked();
+        return true;
+      }
+      mf->SetProperty(includeGuardVar, "TRUE");
+      break;
+    case GLOBAL:
+      cmake* const cm = mf->GetCMakeInstance();
+      if (cm->GetProperty(includeGuardVar)) {
+        status.SetReturnInvoked();
+        return true;
+      }
+      cm->SetProperty(includeGuardVar, "TRUE");
+      break;
+  }
+
+  return true;
+}