Adding lab resources for lessons 6 and 6b

cmake-docker-environment/demos/target-compile/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.9.1)
+project(mainTest)
+
+add_executable(main main.cpp)
+target_compile_definitions(main PRIVATE GREETING="Hello!")
+target_compile_features(main PRIVATE cxx_std_11)
+target_compile_options(main PRIVATE -Wall)

cmake-docker-environment/demos/target-compile/README.md

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+# target-compile
+This is the code demo included at the beginning of the 'Targets' lesson. It is not included with the Docker enviornment's labs.

cmake-docker-environment/demos/target-compile/main.cpp

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+#include <iostream>
+
+int main() {
+	std::cout << GREETING << "\n";
+	return 0;
+}

cmake-docker-environment/labs/ninja-example/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.9.1)
+project(greetingTest)
+
+add_executable(greeting main.cpp greeting.cpp)

cmake-docker-environment/labs/ninja-example/greeting.cpp

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+#include "greeting.h"
+#include <iostream>
+
+void sayHello() {
+	std::cout << "Hello World!\n";
+}

cmake-docker-environment/labs/ninja-example/greeting.h

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+#pragma once
+
+void sayHello();

cmake-docker-environment/labs/ninja-example/main.cpp

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+#include "greeting.h"
+
+int main() {
+	sayHello();
+	return 0;
+}

cmake-docker-environment/labs/ninja-example/readme.md

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+# ninja-example
+The project for this lesson contains the same code as cmake-example. However, instead of creating an executable with Make, this lesson will do the same work using the Ninja generator.
+
+## Exercise 1: Examine the generators found in the lab environment
+   ```
+   $ cmake --help
+   ```
+
+## Exercise 2: Create an executable using Ninja as the generator. Examine the resulting build.ninja file.
+Make a slight change to greeting.cpp and build again.
+   ```
+   $ cd ninja-example
+   $ mkdir build && cd build
+   $ cmake .. -G Ninja
+   $ cmake --build .
+   $ ./greeting
+   ```

cmake-docker-environment/labs/subdirectory-example/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.9.1)
+project(songTest)
+
+add_subdirectory(firstDay)
+add_subdirectory(secondDay)
+
+add_library(thirdDay thirdDay/thirdDay.cpp)
+target_include_directories(thirdDay PUBLIC ${CMAKE_CURRENT_LIST_DIR}/thirdDay/include)
+target_link_libraries(thirdDay PUBLIC secondDay)
+
+add_executable(song main.cpp)
+target_link_libraries(song thirdDay)

cmake-docker-environment/labs/subdirectory-example/firstDay/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.9.1)
+project(songTest VERSION 1.0.0)
+
+add_library(firstDay firstDay.cpp)
+target_include_directories(firstDay PUBLIC ${CMAKE_CURRENT_LIST_DIR}/include)

cmake-docker-environment/labs/subdirectory-example/firstDay/firstDay.cpp

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+#include <iostream>
+#include "firstDay.h"
+
+void firstDay() {
+	std::cout << "1 Partridge in Pear Tree\n";
+}

cmake-docker-environment/labs/subdirectory-example/firstDay/include/firstDay.h

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+#pragma once
+
+void firstDay();

cmake-docker-environment/labs/subdirectory-example/main.cpp

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+#include "firstDay.h"
+#include "secondDay.h"
+#include "thirdDay.h"
+
+int main() {
+	firstDay();
+	secondDay();
+	thirdDay();
+	return 0;
+}

cmake-docker-environment/labs/subdirectory-example/readme.md

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+# subdirectory-example
+This project asks you to manage targets that are created in several CMakeLists.txt files across subdirectories. Before you start, change to the proper directory and make the build directory.
+   ```
+   $ cd subdirectory-example
+   $ mkdir build && cd build
+   ```
+
+## Exercise 1: Move the thirdDay target functionality into thirdDay/CMakeLists.txt
+
+Reverse engineer what you need from other files.
+
+**CMakeLists.txt**
+
+   ```
+   cmake_minimum_required(VERSION 3.9.1)
+   project(songTest)
+
+   add_subdirectory(firstDay)
+   add_subdirectory(secondDay)
+
+   add_library(thirdDay thirdDay/thirdDay.cpp)
+   target_include_directories(thirdDay PUBLIC ${CMAKE_CURRENT_LIST_DIR}/thirdDay/include)
+   target_link_libraries(thirdDay PUBLIC secondDay)
+
+   add_executable(song main.cpp)
+   target_link_libraries(song thirdDay)
+   ```
+
+**secondDay/CMakeLists.txt**
+
+   ```
+   cmake_minimum_required(VERSION 3.9.1)
+   project(songTest)
+
+   add_library(secondDay secondDay.cpp)
+   target_include_directories(secondDay PUBLIC ${CMAKE_CURRENT_LIST_DIR}/include)
+   target_link_libraries(secondDay PUBLIC firstDay)
+   ```
+
+**thirdDay/CMakeLists.txt**
+
+   ```
+   //Exercise 1
+   ```
+
+**Command Line**
+
+Compile and run the executable.
+   ```
+   $ cmake ..
+   $ make
+   $ ./song
+   ```

cmake-docker-environment/labs/subdirectory-example/secondDay/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.9.1)
+project(songTest)
+
+add_library(secondDay secondDay.cpp)
+target_include_directories(secondDay PUBLIC ${CMAKE_CURRENT_LIST_DIR}/include)
+target_link_libraries(secondDay PUBLIC firstDay)

cmake-docker-environment/labs/subdirectory-example/secondDay/include/secondDay.h

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+#pragma once
+
+void secondDay();

cmake-docker-environment/labs/subdirectory-example/secondDay/secondDay.cpp

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+#include <iostream>
+#include "secondDay.h"
+#include "firstDay.h"
+
+void secondDay() {
+	std::cout << "2 Turtle Doves, ";
+	firstDay();
+}

cmake-docker-environment/labs/subdirectory-example/thirdDay/include/thirdDay.h

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+#pragma once
+
+void thirdDay();

cmake-docker-environment/labs/subdirectory-example/thirdDay/thirdDay.cpp

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+#include <iostream>
+#include "thirdDay.h"
+#include "secondDay.h"
+
+void thirdDay() {
+	std::cout << "3 French Hens, ";
+	secondDay();
+}

cmake-docker-environment/labs/targets-example/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.9.1)
+project(songTest)
+
+add_library(firstDay firstDay/firstDay.cpp)
+target_include_directories(firstDay PUBLIC ${CMAKE_CURRENT_LIST_DIR}/firstDay/include)
+
+add_library(secondDay secondDay/secondDay.cpp)
+target_include_directories(secondDay PUBLIC ${CMAKE_CURRENT_LIST_DIR}/secondDay/include)
+target_link_libraries(secondDay PUBLIC firstDay)
+
+# thirdDay target
+
+add_executable(song main.cpp)
+target_link_libraries(song secondDay)

cmake-docker-environment/labs/targets-example/firstDay/firstDay.cpp

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+#include <iostream>
+#include "firstDay.h"
+
+void firstDay() {
+	std::cout << "1 Partridge in Pear Tree\n";
+}

cmake-docker-environment/labs/targets-example/firstDay/include/firstDay.h

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+#pragma once
+
+void firstDay();

cmake-docker-environment/labs/targets-example/main.cpp

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+#include "firstDay.h"
+#include "secondDay.h"
+//#include "thirdDay.h"		//Uncomment out this line
+
+int main() {
+	firstDay();
+	secondDay();
+	//thirdDay();			//Uncomment out this line
+	return 0;
+}

cmake-docker-environment/labs/targets-example/readme.md

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+# targets-example
+This project asks you to create targets that have varying visibility of each other. Before you start, change to the proper directory and make the build directory.
+   ```
+   $ cd targets-example
+   $ mkdir build && cd build
+   ```
+
+## Exercise 1: Create a song executable that uses the thirdDay
+
+**main.cpp**
+
+Remove the comments so that the thirdDay header is included and the thirdDay function is called.
+   ```
+#include "firstDay.h"
+#include "secondDay.h"
+#include "thirdDay.h"  //Exercise 1, comment back in
+
+int main() {
+	firstDay();
+	secondDay();
+	thirdDay()   //Exercise 1, comment back in 
+	return 0;
+}
+   ```
+
+**CMakeLists.txt**
+
+Modify CMakeLists.txt so that the executable utilizes thirdDay functionality. Reverse-engineer what you need for the thirdDay target and make any other tweaks.
+   ```
+   cmake_minimum_required(VERSION 3.9.1)
+   project(songTest)
+
+   add_library(firstDay firstDay/firstDay.cpp)
+   target_include_directories(firstDay PUBLIC ${CMAKE_CURRENT_LIST_DIR}/firstDay/include)
+
+   add_library(secondDay secondDay/secondDay.cpp)
+   target_include_directories(secondDay PUBLIC ${CMAKE_CURRENT_LIST_DIR}/secondDay/include)
+   target_link_libraries(secondDay PUBLIC firstDay)
+
+   #setup the thirdDay target
+
+   add_executable(song main.cpp)
+   target_link_libraries(song secondDay)
+   ```
+
+**Command Line**
+
+Run the executable.
+   ```
+   $ cmake ..
+   $ make
+   $ ./song
+   ```
+
+## Exercise 2: Change the target_include_directory for the thirdDay target to have PRIVATE and INTERFACE visibility
+
+**CMakeLists.txt**
+
+   ```
+   ...
+   target_include_directories(thirdDay PRIVATE ${CMAKE_CURRENT_LIST_DIR}/thirdDay/include)
+   ...
+   ```
+   ```
+   ...
+   target_include_directories(thirdDay INTERFACE ${CMAKE_CURRENT_LIST_DIR}/thirdDay/include)
+   ...
+   ```
+
+**Command Line**
+
+Try compiling and running.
+   ```
+   $ cmake ..
+   $ make
+   $ ./song
+   ```
+
+## Exercise 3: Create a dependency graph and convert it to a PNG
+   ```
+   $ cmake .. --graphviz=song.dot
+   $ dot -Tpng -o song.png song.dot
+   ```

cmake-docker-environment/labs/targets-example/secondDay/include/secondDay.h

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+#pragma once
+
+void secondDay();

cmake-docker-environment/labs/targets-example/secondDay/secondDay.cpp

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+#include <iostream>
+#include "secondDay.h"
+#include "firstDay.h"
+
+void secondDay() {
+	std::cout << "2 Turtle Doves, ";
+	firstDay();
+}

cmake-docker-environment/labs/targets-example/thirdDay/include/thirdDay.h

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+#pragma once
+
+void thirdDay();

cmake-docker-environment/labs/targets-example/thirdDay/thirdDay.cpp

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+#include <iostream>
+#include "thirdDay.h"
+#include "secondDay.h"
+
+void thirdDay() {
+	std::cout << "3 French Hens, ";
+	secondDay();
+}