llvm-project/clang-tools-extra/docs/ModularizeUsage.rst

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================
Modularize Usage
================
``modularize [<modularize-options>] <include-files-list> [<front-end-options>...]``
``<modularize-options>`` is a place-holder for options
specific to modularize, which are described below in
`Modularize Command Line Options`.
``<include-files-list>`` specifies the path of a file name for a
file containing the newline-separated list of headers to check
with respect to each other. Lines beginning with '#' and empty
lines are ignored. Header file names followed by a colon and
other space-separated file names will include those extra files
as dependencies. The file names can be relative or full paths,
but must be on the same line. For example::
header1.h
header2.h
header3.h: header1.h header2.h
Note that unless a ``-prefix (header path)`` option is specified,
non-absolute file paths in the header list file will be relative
to the header list file directory. Use -prefix to specify a different
directory.
``<front-end-options>`` is a place-holder for regular Clang
front-end arguments, which must follow the <include-files-list>.
Note that by default, the underlying Clang front end assumes .h files
contain C source, so you might need to specify the ``-x c++`` Clang option
to tell Clang that the header contains C++ definitions.
Modularize Command Line Options
===============================
.. option:: -prefix <header-path>
Prepend the given path to non-absolute file paths in the header list file.
By default, headers are assumed to be relative to the header list file
directory. Use ``-prefix`` to specify a different directory.
.. option:: -module-map-path=<module-map-path>
Generate a module map and output it to the given file. See the description
in :ref:`module-map-generation`.
.. option:: -root-module=<root-name>
Put modules generated by the -module-map-path option in an enclosing
module with the given name. See the description in :ref:`module-map-generation`.