### Building Examples and Installing Headers in CMake

Source: https://github.com/eidheim/simple-web-server/blob/master/CMakeLists.txt

This block executes only if the project is built as a top-level project (not a sub-project). It adds `http_examples` and `https_examples` executables, links them with the main library and Boost, and installs the public header files to the `include/simple-web-server` destination.

```CMake
# If Simple-Web-Server is not a sub-project:
if("${CMAKE_SOURCE_DIR}" STREQUAL "${CMAKE_CURRENT_SOURCE_DIR}")
    add_executable(http_examples http_examples.cpp)
    target_link_libraries(http_examples simple-web-server)
    find_package(Boost 1.53.0 COMPONENTS system thread filesystem REQUIRED)
    target_link_libraries(http_examples ${Boost_LIBRARIES})
    target_include_directories(http_examples PRIVATE ${Boost_INCLUDE_DIR})
    if(OPENSSL_FOUND)
        add_executable(https_examples https_examples.cpp)
        target_link_libraries(https_examples simple-web-server)
        target_link_libraries(https_examples ${Boost_LIBRARIES})
        target_include_directories(https_examples PRIVATE ${Boost_INCLUDE_DIR})
    endif()
    
    set(BUILD_TESTING ON)
    
    install(FILES server_http.hpp client_http.hpp server_https.hpp client_https.hpp crypto.hpp utility.hpp status_code.hpp DESTINATION include/simple-web-server)
endif()
```

--------------------------------

### CMake Project Initialization and Compiler Flags

Source: https://github.com/eidheim/simple-web-server/blob/master/CMakeLists.txt

Sets the minimum CMake version, defines the project name, and configures build options like using standalone Asio or building tests. It also applies C++11 standard and warning flags for GCC/Clang and a basic warning level for MSVC.

```CMake
cmake_minimum_required (VERSION 3.0)

project (Simple-Web-Server)

option(USE_STANDALONE_ASIO "set ON to use standalone Asio instead of Boost.Asio" OFF)
option(BUILD_TESTING "set ON to build library tests" OFF)

if(NOT MSVC)
    add_compile_options(-std=c++11 -Wall -Wextra -Wsign-conversion)
else()
    add_compile_options(/W1)
endif()

add_library(simple-web-server INTERFACE)

target_include_directories(simple-web-server INTERFACE ${CMAKE_CURRENT_SOURCE_DIR})
```

--------------------------------

### Compile Simple-Web-Server Project

Source: https://github.com/eidheim/simple-web-server/blob/master/README.md

Instructions to compile the Simple-Web-Server project using CMake and Make, requiring a C++11 compliant compiler. This process creates a 'build' directory, configures the project, and compiles it.

```sh
mkdir build
cd build
cmake ..
make
cd ..
```

--------------------------------

### Configuring Asio or Boost.Asio Dependency in CMake

Source: https://github.com/eidheim/simple-web-server/blob/master/CMakeLists.txt

Manages the dependency on either standalone Asio or Boost.Asio. If `USE_STANDALONE_ASIO` is ON, it checks for `asio.hpp`; otherwise, it finds and links Boost components (system, thread). It also includes a special case for older GCC versions to link Boost.Regex.

```CMake
# TODO 2020 when Debian Jessie LTS ends:
# Remove Boost system, thread, regex components; use Boost::<component> aliases; remove Boost target_include_directories
if(USE_STANDALONE_ASIO)
    target_compile_definitions(simple-web-server INTERFACE USE_STANDALONE_ASIO)
    include(CheckIncludeFileCXX)
    CHECK_INCLUDE_FILE_CXX(asio.hpp HAVE_ASIO)
    if(NOT HAVE_ASIO)
        message(FATAL_ERROR "Standalone Asio not found")
    endif()
else()
    find_package(Boost 1.53.0 COMPONENTS system thread REQUIRED)
    target_link_libraries(simple-web-server INTERFACE ${Boost_LIBRARIES})
    target_include_directories(simple-web-server INTERFACE ${Boost_INCLUDE_DIR})
    if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU" AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.9)
        target_compile_definitions(simple-web-server INTERFACE USE_BOOST_REGEX)
        find_package(Boost 1.53.0 COMPONENTS regex REQUIRED)
        target_link_libraries(simple-web-server INTERFACE ${Boost_LIBRARIES})
        target_include_directories(simple-web-server INTERFACE ${Boost_INCLUDE_DIR})
    endif()
endif()
```

--------------------------------

### Configure IO and Parse Tests (Non-MSVC)

Source: https://github.com/eidheim/simple-web-server/blob/master/tests/CMakeLists.txt

Configures and adds tests for I/O and parsing functionalities, specifically for non-Microsoft Visual C++ compilers. These tests are linked against the 'simple-web-server' library and include a compile option to disable access control.

```CMake
if(NOT MSVC)
    add_compile_options(-fno-access-control)
    
    add_executable(io_test io_test.cpp)
    target_link_libraries(io_test simple-web-server)
    add_test(io_test io_test)

    add_executable(parse_test parse_test.cpp)
    target_link_libraries(parse_test simple-web-server)
    add_test(parse_test parse_test)
endif()
```

--------------------------------

### Configure Status Code Test

Source: https://github.com/eidheim/simple-web-server/blob/master/tests/CMakeLists.txt

Configures and adds a test for HTTP status code handling, which is always built regardless of compiler or library availability. This test is linked against the 'simple-web-server' library.

```CMake
add_executable(status_code_test status_code_test.cpp)
target_link_libraries(status_code_test simple-web-server)
add_test(status_code_test status_code_test)
```

--------------------------------

### Enabling and Adding Tests in CMake

Source: https://github.com/eidheim/simple-web-server/blob/master/CMakeLists.txt

Conditionally enables testing for the project if the `BUILD_TESTING` option is set. It then includes the `tests` subdirectory, allowing CMake to discover and configure the project's test suite.

```CMake
if(BUILD_TESTING)
    enable_testing()
    add_subdirectory(tests)
endif()
```

--------------------------------

### Configuring OpenSSL Dependency in CMake

Source: https://github.com/eidheim/simple-web-server/blob/master/CMakeLists.txt

Manages the OpenSSL dependency for the project. It sets a hint for OpenSSL's root directory on macOS and then attempts to find and link OpenSSL libraries if found, enabling SSL/TLS functionalities.

```CMake
if(APPLE)
    set(OPENSSL_ROOT_DIR "/usr/local/opt/openssl")
endif()
find_package(OpenSSL)
if(OPENSSL_FOUND)
    target_compile_definitions(simple-web-server INTERFACE HAVE_OPENSSL)
    target_link_libraries(simple-web-server INTERFACE ${OPENSSL_LIBRARIES})
    target_include_directories(simple-web-server INTERFACE ${OPENSSL_INCLUDE_DIR})
endif()
```

--------------------------------

### Linking Windows Socket Libraries in CMake

Source: https://github.com/eidheim/simple-web-server/blob/master/CMakeLists.txt

Conditionally links the `ws2_32` and `wsock32` libraries, which are required for socket programming on Windows platforms. This ensures proper network functionality when building on Windows.

```CMake
if(WIN32)
    target_link_libraries(simple-web-server INTERFACE ws2_32 wsock32)
endif()
```

--------------------------------

### Linking Thread Library in CMake

Source: https://github.com/eidheim/simple-web-server/blob/master/CMakeLists.txt

Finds and links the required thread library to the `simple-web-server` interface library. This ensures that threading functionalities are available for the project.

```CMake
find_package(Threads REQUIRED)
target_link_libraries(simple-web-server INTERFACE ${CMAKE_THREAD_LIBS_INIT})
```

--------------------------------

### Configure Crypto Test (OpenSSL Found)

Source: https://github.com/eidheim/simple-web-server/blob/master/tests/CMakeLists.txt

Configures and adds a test for cryptographic functionalities, only if OpenSSL is detected on the system. This test is linked against the 'simple-web-server' library.

```CMake
if(OPENSSL_FOUND)
    add_executable(crypto_test crypto_test.cpp)
    target_link_libraries(crypto_test simple-web-server)
    add_test(crypto_test crypto_test)
endif()
```

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