Add ability to include a file in a project via a cache variable.

If a variable exists called CMAKE_PROJECT_<projectName>_INCLUDE,
the file pointed to by that variable will be included as the last step
of the project command.

Source/cmProjectCommand.cxx

@@ -77,6 +77,24 @@ bool cmProjectCommand
     languages.push_back("CXX");
     }
   this->Makefile->EnableLanguage(languages, false);
+  std::string extraInclude = "CMAKE_PROJECT_" + args[0] + "_INCLUDE";
+  const char* include = this->Makefile->GetDefinition(extraInclude.c_str());
+  if(include)
+    {
+    std::string fullFilePath;
+    bool readit =
+      this->Makefile->ReadListFile( this->Makefile->GetCurrentListFile(),
+                                    include);
+    if(!readit && !cmSystemTools::GetFatalErrorOccured())
+      {
+      std::string m =
+        "could not find load file:\n"
+        "  ";
+      m += include;
+      this->SetError(m.c_str());
+      return false;
+      }
+    }
   return true;
 }
 

Source/cmProjectCommand.h

@@ -68,7 +68,10 @@ public:
       "By default C and CXX are enabled.  E.g. if you do not have a "
       "C++ compiler, you can disable the check for it by explicitly listing "
       "the languages you want to support, e.g. C.  By using the special "
-      "language \"NONE\" all checks for any language can be disabled.";
+      "language \"NONE\" all checks for any language can be disabled. "
+      "If a variable exists called CMAKE_PROJECT_<projectName>_INCLUDE_FILE, "
+      "the file pointed to by that variable will be included as the last step "
+      "of the project command.";
     }
   
   cmTypeMacro(cmProjectCommand, cmCommand);

Tests/CMakeOnly/CMakeLists.txt

@@ -22,3 +22,11 @@ add_CMakeOnly_test(CheckLanguage)
 add_CMakeOnly_test(AllFindModules)
 
 add_CMakeOnly_test(TargetScope)
+
+add_CMakeOnly_test(ProjectInclude)
+
+add_test(CMakeOnly.ProjectInclude ${CMAKE_CMAKE_COMMAND}
+  -DTEST=ProjectInclude
+  -DCMAKE_ARGS=-DCMAKE_PROJECT_ProjectInclude_INCLUDE=${CMAKE_CURRENT_SOURCE_DIR}/ProjectInclude/include.cmake
+  -P ${CMAKE_CURRENT_BINARY_DIR}/Test.cmake
+  )

Tests/CMakeOnly/ProjectInclude/CMakeLists.txt

@@ -0,0 +1,4 @@
+project(ProjectInclude)
+if(NOT AUTO_INCLUDE)
+  message(FATAL_ERROR "include file not found")
+endif()

Tests/CMakeOnly/ProjectInclude/include.cmake

@@ -0,0 +1 @@
+set(AUTO_INCLUDE TRUE)

Tests/CMakeOnly/Test.cmake.in

@@ -3,7 +3,8 @@ set(binary_dir "@CMAKE_CURRENT_BINARY_DIR@/${TEST}-build")
 file(REMOVE_RECURSE "${binary_dir}")
 file(MAKE_DIRECTORY "${binary_dir}")
 execute_process(
-  COMMAND ${CMAKE_COMMAND} "${source_dir}" -G "@CMAKE_TEST_GENERATOR@"
+  COMMAND  ${CMAKE_COMMAND} ${CMAKE_ARGS}
+  "${source_dir}" -G "@CMAKE_TEST_GENERATOR@"
   WORKING_DIRECTORY "${binary_dir}"
   RESULT_VARIABLE result
   )