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#[==[.rst:
.. cmake:command:: dawn_add_library

  Create a library.

  .. code-block:: cmake

  dawn_add_library(<name>
    [FORCE_STATIC|FORCE_SHARED|FORCE_OBJECT]
    [HEADER_ONLY]
    [UTILITY_TARGET           <target>]
    [HEADERS                  <header>...]
    [PRIVATE_HEADERS          <header>...]
    [SOURCES                  <source>...]
    [DEPENDS                  <library>...]
    [PRIVATE_DEPENDS          <library>...])

  * ``FORCE_STATIC`` or ``FORCE_SHARED`` or ``FORCE_OBJECT``: Forces a
    static (respectively, shared and object) library to be created.
    If none is provided, ``BUILD_SHARED_LIBS`` will control the library type.
  * ``HEADER_ONLY``: The library only contains headers (or templates) and contains
    no compilation steps. Mutually exclusive with ``FORCE_STATIC``.
  * ``UTILITY_TARGET``: If specified, all libraries and executables made by the
    Dawn library API will privately link to this target. This may be used to
    provide things such as project-wide compilation flags or similar.
  * ``HEADERS``: A list of header files.
  * ``PRIVATE_HEADERS``: A list of private header files.
  * ``SOURCES``: A list of source files which require compilation.
  * ``DEPENDS``: A list of libraries that this library must link against,
    equivalent to PUBLIC deps in target_link_libraries.
  * ``PRIVATE_DEPENDS``: A list of libraries that this library must link against,
    equivalent to PRIVATE deps in target_link_libraries.
#]==]
function(dawn_add_library name)
  set(kwargs)
  cmake_parse_arguments(PARSE_ARGV 1 arg
    "FORCE_STATIC;FORCE_SHARED;FORCE_OBJECT;HEADER_ONLY"
    "UTILITY_TARGET"
    "HEADERS;PRIVATE_HEADERS;SOURCES;DEPENDS;PRIVATE_DEPENDS")

  if (arg_UNPARSED_ARGUMENTS)
    message(FATAL_ERROR
      "Unparsed arguments for dawn_add_library: "
      "${arg_UNPARSED_ARGUMENTS}")
  endif ()

  if (arg_HEADER_ONLY AND arg_FORCE_STATIC)
    message(FATAL_ERROR
      "The ${name} library cannot be header only yet forced static.")
  endif ()

  if (NOT (arg_SOURCES OR arg_HEADERS))
    message(FATAL_ERROR
      "The ${name} library needs at least one of sources or headers.")
  endif ()

  if (arg_FORCE_SHARED AND arg_FORCE_STATIC)
    message(FATAL_ERROR
      "The ${name} library cannot be both shared and static.")
  elseif (arg_FORCE_SHARED AND arg_FORCE_OBJECT)
    message(FATAL_ERROR
      "The ${name} library cannot be both shared and object.")
  elseif (arg_FORCE_STATIC AND arg_FORCE_OBJECT)
    message(FATAL_ERROR
      "The ${name} library cannot be both static and object.")
  endif ()

  if (NOT arg_SOURCES AND NOT arg_HEADER_ONLY)
    message(AUTHOR_WARNING
      "The ${name} library has no source files. Did you mean to "
      "pass the `HEADER_ONLY` flag?")
  endif ()

  set(library_type)
  if (arg_FORCE_STATIC)
    set(library_type STATIC)
  elseif (arg_FORCE_OBJECT)
    set(library_type OBJECT)
  elseif (arg_FORCE_SHARED)
    set(library_type SHARED)
  elseif (BUILD_SHARED_LIBS)
    set(library_type SHARED)
  else ()
    set(library_type STATIC)
  endif ()

  if (arg_HEADER_ONLY)
    add_library("${name}" INTERFACE)
    target_link_libraries("${name}"
      INTERFACE
        ${arg_DEPENDS})
    target_sources("${name}"
      PUBLIC
        ${arg_HEADERS})
  else ()
    add_library("${name}" ${library_type})
    if (arg_HEADERS)
      target_sources("${name}"
        PUBLIC
          ${arg_HEADERS})
    endif ()
    target_sources("${name}"
      PRIVATE
        ${arg_PRIVATE_HEADERS}
        ${arg_SOURCES})
    target_link_libraries("${name}"
      PUBLIC
        ${arg_DEPENDS}
      PRIVATE
        ${arg_PRIVATE_DEPENDS}
        ${arg_UTILITY_TARGET}
      )
    common_compile_options("${name}")
  endif ()
  add_library("dawn::${name}" ALIAS "${name}")
endfunction()