Change to git info processing [WIP]

- gGitInfo is now provided by a .cc file and defined as external in
  the two source files that use it (no more compile time dependency)
- gitinfo.cc is created from gitinfo.cc.in by the CMakeGitInfo module.
- The CMakeGitInfo modules checks whether the git state has changed
  before it creates gitinfo.cc again.

Analysis/src/QwOptions.cc

@@ -14,7 +14,6 @@
 # endif
 #endif
 
-
 #include "QwOptions.h"
 
 // System headers
@@ -28,7 +27,6 @@ QwOptions gQwOptions;
 // Qweak headers
 #include "QwLog.h"
 #include "QwParameterFile.h"
-#include "gitinfo.hh"
 
 // Qweak objects with default options
 #include "QwSubsystemArray.h"
@@ -40,6 +38,9 @@ QwOptions gQwOptions;
 #include "QwRootFile.h"
 #include "QwHistogramHelper.h"
 
+// External objects
+extern const char* const gGitInfo;
+
 // Initialize the static command line arguments to zero
 int QwOptions::fArgc = 0;
 char** QwOptions::fArgv = 0;

Analysis/src/QwRunCondition.cc

@@ -6,7 +6,9 @@
  */
 
 #include "QwRunCondition.h"
-#include "gitinfo.hh"
+
+// External objects
+extern const char* const gGitInfo;
 
 const Int_t QwRunCondition::fCharLength = 127;
 

CMakeLists.txt

@@ -40,20 +40,20 @@ endif()
 # Sources and headers
 #
 file(GLOB my_project_sources
-  Analysis/src/*.cc
-  Parity/src/*.cc
-  )
+		 Analysis/src/*.cc
+		 Parity/src/*.cc
+		 )
 list(REMOVE_ITEM my_project_sources
 		 ${PROJECT_SOURCE_DIR}/Analysis/src/QwF1TDContainer.cc
 		 ${PROJECT_SOURCE_DIR}/Analysis/src/QwSIS3320_Samples.cc
 		 )
 
 file(GLOB my_project_headers
-  Analysis/include/*.h
-  Parity/include/*.h
-  )
+		 Analysis/include/*.h
+		 Parity/include/*.h
+		 )
 list(REMOVE_ITEM my_project_headers
-	    	 ${PROJECT_SOURCE_DIR}/Analysis/include/QwF1TDContainer.h
+		 ${PROJECT_SOURCE_DIR}/Analysis/include/QwF1TDContainer.h
 		 ${PROJECT_SOURCE_DIR}/Analysis/include/QwSIS3320_Samples.h
 		 )
 
@@ -90,22 +90,12 @@ config_add_dependency(ROOT ${minimum_root_version})
 
 
 #----------------------------------------------------------------------------
-# gitinfo.hh
+# gitinfo.cc
 #
-add_custom_command(
-  OUTPUT  ${CMAKE_CURRENT_BINARY_DIR}/include/gitinfo.hh.does_not_exist
-  COMMAND ${CMAKE_CURRENT_SOURCE_DIR}/bin/pullgitinfo.py ${CMAKE_CURRENT_SOURCE_DIR}
-  COMMENT "Getting Git information"
-  )
-add_custom_command(
-  OUTPUT  ${CMAKE_CURRENT_BINARY_DIR}/include/gitinfo.hh
-  COMMAND echo -n
-  DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/include/gitinfo.hh.does_not_exist
-  )
-set_property(
-  SOURCE Analysis/src/QwOptions.cc Analysis/src/QwRunCondition.cc
-  APPEND PROPERTY OBJECT_DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/include/gitinfo.hh
-  )
+set(PRE_CONFIGURE_FILE ${PROJECT_SOURCE_DIR}/cmake/templates/gitinfo.cc.in)
+set(POST_CONFIGURE_FILE ${CMAKE_CURRENT_BINARY_DIR}/gitinfo.cc)
+include(CMakeGitInfo)
+set(my_project_sources ${my_project_sources} ${POST_CONFIGURE_FILE})
 
 
 #----------------------------------------------------------------------------
@@ -157,8 +147,7 @@ endforeach()
 #----------------------------------------------------------------------------
 # main library
 #
-add_library(${PROJECT_NAME} SHARED ${my_project_sources} ${my_project_headers}
-  ${CMAKE_CURRENT_BINARY_DIR}/include/gitinfo.hh)
+add_library(${PROJECT_NAME} SHARED ${my_project_sources} ${my_project_headers})
 
 target_include_directories(${PROJECT_NAME}
   PUBLIC