From f00c91bf430c2b487c55493ce7fad4c9943fad8c Mon Sep 17 00:00:00 2001
From: Joao Carreira <jfmcarreira@gmail.com>
Date: Thu, 30 Jan 2014 20:06:10 +0000
Subject: [PATCH] Improve CMakeLists to handle variables and initial support
 for QT4

---
 CMakeLists.txt | 116 ++++++++++++++++++++++++++++++++++++++-----------
 1 file changed, 90 insertions(+), 26 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 0cc40f5..3d78450 100755
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -12,8 +12,6 @@ PROJECT( playuver )
 
 SET( PROJECT_NAME playuver )
 
-SET( CMAKE_BUILD_TYPE Debug )
-
 # Project directories 
 SET( SRC_DIR source )
 SET( INC_DIR source )
@@ -26,20 +24,6 @@ SET( CMAKE_INCLUDE_CURRENT_DIR ON )
 # Instruct CMake to run moc automatically when needed.
 SET( CMAKE_AUTOMOC ON )
 
-
-######################################################################################
-# Dependencies
-######################################################################################
-#FIND_PACKAGE( OpenCV REQUIRED   )
-
-
-######################################################################################
-# Qt5 library
-######################################################################################
-FIND_PACKAGE( Qt5Core           )
-FIND_PACKAGE( Qt5Gui            )
-FIND_PACKAGE( Qt5Widgets        )
-
 INCLUDE_DIRECTORIES( ${CMAKE_BINARY_DIR} ${INC_DIR}  ) 
 
 FILE( GLOB SOURCES_FILES   ${SRC_DIR}/*.cpp ) 
@@ -47,16 +31,94 @@ FILE( GLOB HEADERS_FILES   ${INC_DIR}/*.h   )
 FILE( GLOB FORMS_FILES     ${UI_DIR}/*.ui   )
 FILE( GLOB RESOURCES_FILES ${RSC_DIR}/*.qrc )
 
-INCLUDE_DIRECTORIES( ${Qt5Widgets_INCLUDE_DIRS} ${Qt5Core_INCLUDE_DIRS} ${Qt5Gui_INCLUDE_DIRS})
+######################################################################################
+# Macros
+######################################################################################
+macro(ADD_OPTION variable description value)
+  set(__value ${value})
+  set(__condition "")
+  set(__varname "__value")
+  foreach(arg ${ARGN})
+    if(arg STREQUAL "IF" OR arg STREQUAL "if")
+      set(__varname "__condition")
+    else()
+      list(APPEND ${__varname} ${arg})
+    endif()
+  endforeach()
+  unset(__varname)
+  if("${__condition}" STREQUAL "")
+    set(__condition 2 GREATER 1)
+  endif()
 
-# QT5_WRAP_CPP( HEADERS_MOC_FILES ${HEADERS_FILES} )
-QT5_WRAP_UI( FORMS_HEADERS_FILES ${FORMS_FILES} )
-QT5_ADD_RESOURCES( RESOURCES_RCC_FILES ${RESOURCES_FILES} )
+  if(${__condition})
+    if("${__value}" MATCHES ";")
+      if(${__value})
+        option(${variable} "${description}" ON)
+      else()
+        option(${variable} "${description}" OFF)
+      endif()
+    elseif(DEFINED ${__value})
+      if(${__value})
+        option(${variable} "${description}" ON)
+      else()
+        option(${variable} "${description}" OFF)
+      endif()
+    else()
+      option(${variable} "${description}" ${__value})
+    endif()
+  else()
+    unset(${variable} CACHE)
+  endif()
+  unset(__condition)
+  unset(__value)
+endmacro()
 
-SET( QT_USE_QTOPENGL TRUE )
+######################################################################################
+# Variables
+######################################################################################
+ADD_OPTION(CMAKE_BUILD_TYPE  "Build type"               Debug )
+ADD_OPTION(USE_QT4           "Build with QT4"           OFF )
+ADD_OPTION(USE_OPENCV        "Add OpenCV support"       OFF )
+
+######################################################################################
+# Dependencies
+######################################################################################
+IF(HAVE_OpenCV)
+  FIND_PACKAGE( OpenCV REQUIRED   )
+  #CMAKEDEFINE HAVE_MALLOC_H 1
+ENDIF()
+
+######################################################################################
+# Qt library
+######################################################################################
+IF( USE_QT4 )
+    FIND_PACKAGE( Qt4 REQUIRED QtCore QtGui )
+    IF( NOT QT4_FOUND)
+        SET(USE_QT4 FALSE)
+    ENDIF()
+    INCLUDE( ${QT_USE_FILE} )
+    ADD_DEFINITIONS( ${QT_DEFINITIONS} )
+    SET( CURR_QT_LINKER_LIBS ${QT_LIBRARIES} )
+ENDIF()
+
+IF( NOT USE_QT4 )
+    FIND_PACKAGE( Qt5Core REQUIRED )
+    FIND_PACKAGE( Qt5Gui REQUIRED )
+    FIND_PACKAGE( Qt5Widgets REQUIRED )
+    
+    INCLUDE_DIRECTORIES( ${Qt5Widgets_INCLUDE_DIRS} ${Qt5Core_INCLUDE_DIRS} ${Qt5Gui_INCLUDE_DIRS} )
+    # QT5_WRAP_CPP( HEADERS_MOC_FILES ${HEADERS_FILES} )
+    QT5_WRAP_UI( FORMS_HEADERS_FILES ${FORMS_FILES} )
+    QT5_ADD_RESOURCES( RESOURCES_RCC_FILES ${RESOURCES_FILES} )
+    
+    # Add compiler flags for building executables (-fPIE)
+    SET( CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS} ${Qt5Core_EXECUTABLE_COMPILE_FLAGS} )
+    
+    SET( CURR_QT_LINKER_LIBS ${Qt5Core_LIBRARIES} ${Qt5Gui_LIBRARIES} ${Qt5Widgets_LIBRARIES} )
+    
+    SET( CURR_QT_MODULES Core Gui Widgets )
+ENDIF()
 
-# Add compiler flags for building executables (-fPIE)
-SET( CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${Qt5Core_EXECUTABLE_COMPILE_FLAGS}" )
 
 ######################################################################################
 # External Libs
@@ -72,8 +134,10 @@ SET( LIST_EXTERNAL_LIBS Scode )
 # Target App
 ######################################################################################
 ADD_EXECUTABLE( ${PROJECT_NAME} ${SOURCES_FILES} ${HEADERS_MOC_FILES} ${FORMS_HEADERS_FILES} ${RESOURCES_RCC_FILES} )
-TARGET_LINK_LIBRARIES( ${PROJECT_NAME} ${LIST_EXTERNAL_LIBS} ${Qt5Core_LIBRARIES} ${Qt5Gui_LIBRARIES} ${Qt5Widgets_LIBRARIES} )
-QT5_USE_MODULES( ${PROJECT_NAME} Core Gui Widgets )
-
+TARGET_LINK_LIBRARIES( ${PROJECT_NAME} ${LIST_EXTERNAL_LIBS} ${CURR_QT_LINKER_LIBS} )
+
+IF( NOT USE_QT4)
+    QT5_USE_MODULES( ${PROJECT_NAME} ${CURR_QT_MODULES} )
+ENDIF()