Tutorial: Move Step4-Ex1 to Step3-Ex2

During the training, we talk about INTERFACE libraries just before Step3
so it makes more sense to do the exercise related to them in Step3

Help/guide/tutorial/Step3/CMakeLists.txt

@@ -3,6 +3,12 @@ cmake_minimum_required(VERSION 3.10)
 # set the project name and version
 project(Tutorial VERSION 1.0)
 
+# TODO 4: Replace the following code by:
+# * Creating an interface library called tutorial_compiler_flags
+#   Hint: use add_library() with the INTERFACE signature
+# * Add compiler feature cxx_std_11 to tutorial_compiler_flags
+#   Hint: Use target_compile_features()
+
 # specify the C++ standard
 set(CMAKE_CXX_STANDARD 11)
 set(CMAKE_CXX_STANDARD_REQUIRED True)
@@ -20,6 +26,8 @@ list(APPEND EXTRA_INCLUDES "${PROJECT_SOURCE_DIR}/MathFunctions")
 # add the executable
 add_executable(Tutorial tutorial.cxx)
 
+# TODO 5: Link Tutorial to tutorial_compiler_flags
+
 target_link_libraries(Tutorial PUBLIC MathFunctions)
 
 # TODO 3: Remove use of EXTRA_INCLUDES

Help/guide/tutorial/Step3/MathFunctions/CMakeLists.txt

@@ -14,5 +14,9 @@ if (USE_MYMATH)
               mysqrt.cxx
               )
 
+  # TODO 7: Link SqrtLibrary to tutorial_compiler_flags
+
   target_link_libraries(MathFunctions PUBLIC SqrtLibrary)
 endif()
+
+# TODO 6: Link MathFunctions to tutorial_compiler_flags