/**
 * @page build Building libyang
 * 
 * [TOC]
 *
 * libyang utilizes CMake build system to detect necessary dependencies, checkout the build environment and prepare Makefiles
 * for the compilation of the library and acompanied tools.
 *
 * @section buildRequirements Requirements
 *
 * @subsection buildRequirementsCompile Building Requirements
 *
 * - C compiler (gcc, clang, ...)
 * - CMake >= 2.8.12
 * - libpcre2 (including headers - devel package) >= 10.30
 *
 * @subsubsection buildRequirementsCompileOptional Optional Requirements
 *
 * - doxygen (for generating documentation)
 * - cmocka >= 1.0.0 (for tests)
 * - valgrind (for enhanced testing)
 * - gcov (for code coverage)
 * - lcov (for code coverage)
 * - genhtml (for code coverage)
 *
 * @subsection buildRequirementsRun Runtime Requirements
 *
 * - libpcre2 (runtime package) >= 10.30
 *
 * @section buildCommands Building
 *
 * To simply build libyang library and the accompanied tools with the default settings, follow these steps (the `#` character
 * indicates command(s) to run with `root` privileges):
 *
 *     $ mkdir build; cd build
 *     $ cmake ..
 *     $ make
 *     # make install
 *
 * The default settings can be changed with various CMake variables set via command line or using e.g. `ccmake(1)` tool.
 * The following sections introduces those variables and explain their meaning.
 *
 * @section buildTypes Build Types
 * 
 * There are several build types according to the primary goal of using the built binaries.
 *
 * @subsection buildTypesRelese Release
 *
 * Build type to produce final binaries for production use without any debug option. The compiler flags are set as follows:
 *
 *     -Wall -Wextra -Wno-missing-field-initializers -std=c99 -O3 -DNDEBUG
 *
 * Here is the list of the selected additional options available in the *Release* build type.
 * 
 * Option                | Description                                                                        | Default
 * ----------------------|------------------------------------------------------------------------------------|--------
 * ENABLE_BUILD_TESTS    | Build tests.                                                                       | OFF
 * ENABLE_VALGRIND_TESTS | Build tests with valgrind.                                                         | OFF
 * ENABLE_COVERAGE       | Build code coverage report from tests.                                             | OFF
 * ENABLE_FUZZ_TARGETS   | Build target programs suitable for fuzzing with AFL.                               | OFF
 * BUILD_SHARED_LIBS     | Build shared (.so) instead of static (.a) library                                  | ON
 * INTERNAL_DOCS         | Include developers notes and internal API description into generated Documentation | OFF
 *
 * Here is the list of available important targets for the `make(1)` tool:
 *
 * Target | Description
 * -------|------------------------------------------------------------------------------------------------------------
 * all    | Default target, builds libyang library (.so), `yanglint(1)` and `yangre(1)`.
 * clean  | Removes files generated by the make process.
 * cclean | Extends the `clean` target by removing all the cmake generated files.
 * doc    | Generate HTML documentation. Requires `doxygen(1)`.
 * 
 * @subsection buildTypesDebug Debug
 *
 * `Debug` is the default build type, the produced binaries include additional debug information and the prepared tests are
 * also built. The compiler flags are set as follows:
 *
 *     -Wall -Wextra -Wno-missing-field-initializers -std=c99 -g3 -O0
 *
 * Here is the list of the selected additional options available in the *Debug* build type.
 * 
 * Option                | Description                                                                        | Default
 * ----------------------|------------------------------------------------------------------------------------|--------
 * ENABLE_BUILD_TESTS    | Build tests.                                                                       | ON
 * ENABLE_VALGRIND_TESTS | Build tests with valgrind.                                                         | ON
 * ENABLE_COVERAGE       | Build code coverage report from tests.                                             | OFF
 * ENABLE_FUZZ_TARGETS   | Build target programs suitable for fuzzing with AFL.                               | OFF
 * BUILD_SHARED_LIBS     | Build shared (.so) instead of static (.a) library                                  | ON
 * INTERNAL_DOCS         | Include developers notes and internal API description into generated Documentation | OFF
 *
 * Here is the list of available important targets for the `make(1)` tool:
 *
 * Target       | Description
 * -------------|------------------------------------------------------------------------------------------------------
 * all          | Default target, builds libyang library (.so), `yanglint(1)` and `yangre(1)`.
 * clean        | Removes files generated by the make process.
 * cclean       | Extends the `clean` target by removing all the cmake generated files.
 * doc          | Generate HTML documentation. Requires `doxygen(1)`.
 * test         | Run implementation tests. Requires `cmocka` (and `valgrind(1)` for part of the tests).
 * format       | Reformat source codes using `uncrustify(1)`.
 * format-check | Dry-run of the `format` target.
 *
 * @subsection buildTypesABICheck ABICheck
 *
 * Special build type to perform check of the ABI/API compatibility and generate reports. In addition to the basic 
 * requirements, the build type requires some of the <a href="https://abi-laboratory.pro/">ABI Laboratory tools</a>:
 * `abi-dumper(1)` and `abi-compliance-checker(1)`.
 *
 * The compiler flags are set as follows:
 *
 *     -Wall -Wextra -Wno-missing-field-initializers -std=c99 -g -Og
 *
 * All the additional options are switched OFF and the settings should not be changed.
 *
 * Here is the list of available important targets for the `make(1)` tool:
 *
 * Target       | Description
 * -------------|------------------------------------------------------------------------------------------------------
 * all          | Default target, builds libyang library (.so), `yanglint(1)` and `yangre(1)`.
 * clean        | Removes files generated by the make process.
 * cclean       | Extends the `clean` target by removing all the cmake generated files.
 * doc          | Generate HTML documentation. Requires `doxygen(1)`.
 * abi-check    | Check the backward compatibility of the API/ABI changes. Requires `abi-compliance-checker(1)` and `abi-dump(1)`.
 * abi-dump     | Helper target for `abi-check` generating API/ABI reports. Requires `abi-dump(1)`.
 
 * @subsection buildTypesDocOnly DocOnly
 *
 * Special build type to avoid any requirements except those for building documentation. There are no compiler flags set
 * since the build type does not allow building any binary output. The settings of the additional options should not be
 * changed.
 *
 * Here is the list of available important targets for the `make(1)` tool:
 *
 * Target       | Description
 * -------------|------------------------------------------------------------------------------------------------------
 * all          | Default target, does nothing.
 * doc          | Generate HTML documentation. Requires `doxygen(1)`.
 *
 */