simplify cmake usage by nana-demo including nana

.gitignore

@@ -42,6 +42,7 @@ lib/
 CMakeCache.txt
 CMakeFiles/
 cmake-build-debug/
+cmake-build-*/
 .idea/
 cmake_install.cmake
 *.DS_Store

.travis.yml

@@ -56,18 +56,11 @@ before_script :
   - sleep 3 # give xvfb some time to start
   # we have:  qPCR4vir/nana/../nana-demo and  now we are in: qPCR4vir/nana/  our executable tests will access: ../nana-demo/Examples/*.bmp etc.(need to be in parallel with nana-demo/Examples)
   #- cd ../nana-demo
-  - mkdir ../nana_lib
-  - mkdir ../nana_demo_bin
   - cd ../nana_lib
   - mkdir  bin
   - cd bin
 
 script:
-  # Installing: the static "nana lib" will be in DESTDIR/CMAKE_INSTALL_PREFIX/lib/
-  # and the includes files "nana" in DESTDIR/CMAKE_INSTALL_PREFIX/include/
-  # we are in "... nana/../nana_lib/bin/" we need "../../nana" to get the CMakeList.txt of nana.
-  # Thus, make install will put the nana.lib in "... nana/../nana_lib/lib/"
-  # and the includes in "... nana/../nana_lib/include/"
   - cmake -G"Unix Makefiles" ../../nana -DCMAKE_INSTALL_PREFIX=.. -DNANA_CMAKE_ENABLE_JPEG=ON -DNANA_CMAKE_ENABLE_PNG=OFF -DNANA_CMAKE_BUILD_DEMOS=ON -DNANA_CMAKE_ENABLE_AUDIO=OFF -DNANA_CMAKE_FIND_BOOST_FILESYSTEM=ON -DNANA_CMAKE_BOOST_FILESYSTEM_FORCE=OFF  -DNANA_CMAKE_AUTOMATIC_GUI_TESTING=ON
   - make install
   - ls

CMakeLists.txt

@@ -17,7 +17,7 @@
 
 # https://cliutils.gitlab.io/modern-cmake/
 # https://cmake.org/cmake-tutorial/
-# https://cmake.org/cmake/help/v3.13/module/CMakeDependentOption.html?highlight=cmakedependentoption
+# https://cmake.org/cmake/help/v3.12/module/CMakeDependentOption.html?highlight=cmakedependentoption
 # use CACHE FORCE  or set(ENABLE_MINGW_STD_THREADS_WITH_MEGANZ ON) or delete CMakecache.txt or the entirely build dir
 # if your changes don't execute
 #  It seems that project() defines essential system variables like CMAKE_FIND_LIBRARY_PREFIXES.
@@ -312,7 +312,7 @@ if(NANA_CMAKE_ENABLE_PNG)
         if(PNG_FOUND)
             target_include_directories(nana PRIVATE ${PNG_INCLUDE_DIRS})
             target_compile_options    (nana PRIVATE ${PNG_LIBRARIES})
-            target_compile_definitions(nana PRIVATE NANA_ENABLE_PNG USE_LIBPNG_FROM_OS)
+            target_compile_definitions(nana PUBLIC NANA_ENABLE_PNG USE_LIBPNG_FROM_OS)
         endif()
     else()
         target_compile_definitions(nana PRIVATE NANA_ENABLE_PNG)
@@ -326,7 +326,7 @@ if(NANA_CMAKE_ENABLE_JPEG)
         if(JPEG_FOUND)
             target_include_directories(nana PRIVATE  ${JPEG_INCLUDE_DIR})
             target_compile_options    (nana PRIVATE  ${JPEG_LIBRARY})
-            target_compile_definitions(nana PRIVATE NANA_ENABLE_JPEG USE_LIBJPEG_FROM_OS)
+            target_compile_definitions(nana PUBLIC NANA_ENABLE_JPEG USE_LIBJPEG_FROM_OS)
         endif()
     else()
         target_compile_definitions(nana PRIVATE NANA_ENABLE_JPEG)
@@ -335,7 +335,7 @@ endif()
 
 # Find ASOUND
 if(NANA_CMAKE_ENABLE_AUDIO)
-    target_compile_definitions(nana PRIVATE NANA_ENABLE_AUDIO)
+    target_compile_definitions(nana PUBLIC NANA_ENABLE_AUDIO)
     if(UNIX)
         find_package(ASOUND)
         if(ASOUND_FOUND)