CMake: refactor and reformat CMake files

- raise minimum CMake version from 2.6.3 to 3.2.3 (Jun 01, 2015)
- indent all CMake files according to the CMP (2 col.)
- refactor FLTK version number definitions and usage
- unify CMake and autoconf/configure variable names:
  - FL_VERSION -> FLTK_VERSION
  - FL_MAJOR_VERSION -> FLTK_VERSION_MAJOR
  - etc. for _MINOR_ and _PATCH_, respectively
  - note: this does not affect FL_VERSION etc. in source code
- generate "export headers" for all libraries (experimental: OFF)
- port some forgotten goodies from branch-1.3 to master
- merge and improve macro 'create_example' (WIP)
- remove "temporary" options and code for older CMake versions
- include and use 'GenerateExportHeader' (experimental, WIP: OFF)
  - note: created header files are not yet used
- build only *one* DLL with Visual Studio (tested, works)
  - similar to the bundled IDE projects in 1.3.x
- add some dynamically linked test/demo programs ('*-shared')
  if shared libraries are built (WIP)
- split 'macros.cmake': use one file per macro

1 files changed, 54 insertions, 55 deletions

diff --git a/fluid/CMakeLists.txt b/fluid/CMakeLists.txt
index e730f274c..30b105891 100644
--- a/fluid/CMakeLists.txt
+++ b/fluid/CMakeLists.txt
@@ -1,7 +1,7 @@
 #
 # CMakeLists.txt to build fluid for the FLTK project using CMake (www.cmake.org)
 #
-# Copyright 1998-2018 by Bill Spitzak and others.
+# Copyright 1998-2020 by Bill Spitzak and others.
 #
 # This library is free software. Distribution and use rights are outlined in
 # the file "COPYING" which should have been included with this file.  If this
@@ -14,85 +14,84 @@
 #     https://www.fltk.org/bugs.php
 #
 
+if (NOT ANDROID)
 
-if(NOT ANDROID)
-
-set(CPPFILES
-    CodeEditor.cxx
-    Fl_Function_Type.cxx
-    Fl_Group_Type.cxx
-    Fl_Menu_Type.cxx
-    Fl_Type.cxx
-    Fl_Widget_Type.cxx
-    Fl_Window_Type.cxx
-    Fluid_Image.cxx
-    about_panel.cxx
-    align_widget.cxx
-    alignment_panel.cxx
-    code.cxx
-    factory.cxx
-    file.cxx
-    fluid.cxx
-    function_panel.cxx
-    template_panel.cxx
-    undo.cxx
-    widget_panel.cxx
+set (CPPFILES
+  CodeEditor.cxx
+  Fl_Function_Type.cxx
+  Fl_Group_Type.cxx
+  Fl_Menu_Type.cxx
+  Fl_Type.cxx
+  Fl_Widget_Type.cxx
+  Fl_Window_Type.cxx
+  Fluid_Image.cxx
+  about_panel.cxx
+  align_widget.cxx
+  alignment_panel.cxx
+  code.cxx
+  factory.cxx
+  file.cxx
+  fluid.cxx
+  function_panel.cxx
+  template_panel.cxx
+  undo.cxx
+  widget_panel.cxx
 )
 
 # ExternalCodeEditor: platform specific files
 
 if (WIN32)
-    list(APPEND CPPFILES ExternalCodeEditor_WIN32.cxx)
+  list (APPEND CPPFILES ExternalCodeEditor_WIN32.cxx)
 else ()
-    list(APPEND CPPFILES ExternalCodeEditor_UNIX.cxx)
+  list (APPEND CPPFILES ExternalCodeEditor_UNIX.cxx)
 endif (WIN32)
 
-if(APPLE AND (NOT OPTION_APPLE_X11) AND (NOT OPTION_APPLE_SDL))
-  set(ICON_NAME fluid.icns)
-  set(ICON_PATH "${PROJECT_SOURCE_DIR}/fluid/fluid.app/Contents/Resources/${ICON_NAME}")
+if (APPLE AND (NOT OPTION_APPLE_X11) AND (NOT OPTION_APPLE_SDL))
+  set (ICON_NAME fluid.icns)
+  set (ICON_PATH "${PROJECT_SOURCE_DIR}/fluid/fluid.app/Contents/Resources/${ICON_NAME}")
   add_executable(fluid MACOSX_BUNDLE ${CPPFILES} ${ICON_PATH})
-else()
+else ()
   add_executable(fluid WIN32 ${CPPFILES})
-endif(APPLE AND (NOT OPTION_APPLE_X11) AND (NOT OPTION_APPLE_SDL))
+endif (APPLE AND (NOT OPTION_APPLE_X11) AND (NOT OPTION_APPLE_SDL))
 
 target_link_libraries(fluid fltk fltk_images fltk_forms)
 
 # install fluid
 
-if(APPLE AND (NOT OPTION_APPLE_X11) AND (NOT OPTION_APPLE_SDL))
+if (APPLE AND (NOT OPTION_APPLE_X11) AND (NOT OPTION_APPLE_SDL))
   # create bundle
-  set_target_properties(fluid PROPERTIES MACOSX_BUNDLE_INFO_PLIST "${PROJECT_SOURCE_DIR}/fluid/fluid.app/Contents/Info.plist")
-  set_target_properties(fluid PROPERTIES MACOSX_BUNDLE_ICON_FILE ${ICON_NAME})
-  set_target_properties(fluid PROPERTIES RESOURCE ${ICON_PATH})
+  set_target_properties (fluid PROPERTIES MACOSX_BUNDLE_INFO_PLIST "${PROJECT_SOURCE_DIR}/fluid/fluid.app/Contents/Info.plist")
+  set_target_properties (fluid PROPERTIES MACOSX_BUNDLE_ICON_FILE ${ICON_NAME})
+  set_target_properties (fluid PROPERTIES RESOURCE ${ICON_PATH})
   # install
-  install(TARGETS fluid DESTINATION ${FLTK_BINDIR})
+  install (TARGETS fluid DESTINATION ${FLTK_BINDIR})
 else()
-  install(TARGETS fluid
+  install (TARGETS fluid
     EXPORT FLTK-Targets
     RUNTIME DESTINATION ${FLTK_BINDIR}
     LIBRARY DESTINATION ${FLTK_LIBDIR}
     ARCHIVE DESTINATION ${FLTK_LIBDIR}
-    )
-endif(APPLE AND (NOT OPTION_APPLE_X11) AND (NOT OPTION_APPLE_SDL))
+  )
+endif (APPLE AND (NOT OPTION_APPLE_X11) AND (NOT OPTION_APPLE_SDL))
 
 # install desktop files
 
-if(UNIX)
-    install(FILES fluid.desktop
-        DESTINATION ${FLTK_DATADIR}/applications
-        )
-    # Install mime-type file. x-fluid.desktop method is deprecated.
-    install(FILES fluid.xml
-        DESTINATION ${FLTK_DATADIR}/mime/packages
-        )
+if (UNIX)
+  install (FILES fluid.desktop
+    DESTINATION ${FLTK_DATADIR}/applications
+  )
+  # Install mime-type file (x-fluid.desktop method is deprecated)
+  install (FILES fluid.xml
+    DESTINATION ${FLTK_DATADIR}/mime/packages
+  )
 
-    # Install desktop icons.
-    foreach(icon 32 48 64 128)
-        install(FILES icons/fluid-${icon}.png
-            DESTINATION ${FLTK_DATADIR}/icons/hicolor/${icon}x${icon}/apps
-            RENAME fluid.png
-        )
-    endforeach()
-endif(UNIX)
+  # Install desktop icons
+  foreach (icon 32 48 64 128)
+    install (FILES icons/fluid-${icon}.png
+      DESTINATION ${FLTK_DATADIR}/icons/hicolor/${icon}x${icon}/apps
+      RENAME fluid.png
+    )
+  endforeach()
+endif (UNIX)
 
-endif(NOT ANDROID)
+endif (NOT ANDROID)