cxx_lua_extension()

This is liable to change in the future.

A cxx_lua_extension() rule is a variant of a C/C++ library which is built as a Lua module. As such, it has a module name formed by the base_module parameter and the rule name and implictly depends on Lua C library (configured via the [lua].cxx_library parameter.

Arguments

• name (required) #

  The short name for this build target.

• base_module (defaults to None) #

  The package for which the given specified sources and resources should reside in their final location in the top-level binary. If unset, the project relative directory that houses the BUCK file is used.

• srcs (defaults to []) #

  The set of C, C++, Objective-C, Objective-C++, or assembly source files to be preprocessed, compiled, and assembled by this rule. We determine which stages to run on each input source based on its file extension. See the GCC documentation for more detail on how file extensions are interpreted. Each element can be either a string specifying a source file (e.g. 'foo/bar.c') or a tuple of a string specifying a source file and a list of compilation flags (e.g. ('foo/bar.c', ['-Wall', '-Werror'])). In the latter case the specified flags will be used in addition to the rule's other flags when preprocessing and compiling that file (if applicable).

• platform_srcs (defaults to []) #

  Platform specific source files. These should be specified as a list of pairs where the first element is an un-anchored regex (in java.util.regex.Pattern syntax) against which the platform name is matched, and the second element is either a list of source files or a list of tuples of source files and a list of compilation flags to be preprocessed, compiled and assembled if the platform matches the regex. See srcs for more information.

• headers (defaults to []) #

  The set of header files that are made available for inclusion to the source files in this target. These should be specified as either a list of header files or a dictionary of header names to header files. The header name can contain forward slashes (/). The headers can be included with #include "$HEADER_NAMESPACE/$HEADER_NAME" or #include <$HEADER_NAMESPACE/$HEADER_NAME>, where $HEADER_NAMESPACE is the value of the target's header_namespace attribute, and $HEADER_NAME is the header name if specified, and the filename of the header file otherwise. See header_namespace for more information.

• platform_headers (defaults to []) #

  Platform specific header files. These should be specified as a list of pairs where the first element is an un-anchored regex (in java.util.regex.Pattern syntax) against which the platform name is matched, and the second element is either a list of header files or a dictionary of header names to header files that will be made available for inclusion to the source files in the target if the platform matches the regex. See headers for more information.

• header_namespace (defaults to name) #

  A path prefix when including headers of this target. Defaults to the path from the root of the repository to the directory where this target is defined. Can contain forward slashes (/), but cannot start with one. See headers for more information.

• preprocessor_flags (defaults to []) #

  Flags to use when preprocessing any of the above sources (which require preprocessing).

• platform_preprocessor_flags (defaults to []) #

  Platform specific preprocessor flags. These should be specified as a list of pairs where the first element is an un-anchored regex (in java.util.regex.Pattern syntax) against which the platform name is matched, and the second element is a list of flags to use when preprocessing the target's sources. See preprocessor_flags for more information.

• compiler_flags (defaults to []) #

  Flags to use when compiling any of the above sources (which require compilation).

• platform_compiler_flags (defaults to []) #

  Platform specific compiler flags. These should be specified as a list of pairs where the first element is an un-anchored regex (in java.util.regex.Pattern syntax) against which the platform name is matched, and the second element is a list of flags to use when compiling the target's sources. See compiler_flags for more information.

• linker_flags (defaults to []) #

  Flags to add to the linker command line whenever the output from this rule is used in a link operation, such as linked into an executable or a shared library.

• platform_linker_flags (defaults to []) #

  Platform-specific linker flags. This argument is specified as a list of pairs where the first element in each pair is an un-anchored regex against which the platform name is matched. The regex should use java.util.regex.Pattern syntax. The second element in each pair is a list of linker flags. If the regex matches the platform, these flags are added to the linker command line when the output from this rule is used in a link operation.

• tests (defaults to []) #

  List of build targets that identify tests that exercise this target.

• visibility (defaults to []) #

  List of build target patterns that identify the build rules that can include this rule as a dependency, for example, by listing it in their deps or exported_deps attributes. For more information, see visibility.

• licenses (defaults to []) #

  Set of license files for this library. To get the list of license files for a given build rule and all of its dependencies, you can use buck query.

• labels (defaults to []) #

  Set of arbitrary strings which allow you to annotate a build rule with tags that can be searched for over an entire dependency tree using buck query attrfilter().

Examples

# A rule that builds a Lua extension from a single .cpp file.
cxx_lua_extension(
  name = 'mymodule',
  base_module = 'foo.bar',
  srcs = [
    'mymodule.cpp',
  ],
  compiler_flags = [
    '-fno-omit-frame-pointer',
  ],
)

# A library rule which has a single source importing the above extension.
lua_library(
  name = 'utils',
  srcs = [
    'utils.lua',
  ],
  deps = [
    ':mymodule',
  ],
)

-- The `utils.lua` source, wrapped by the `utils` rule above.

-- Import the C/C++ extension build above.
require "foo.bar.mymodule"

...