Buck: ndk_library()


An ndk_library() is used to define a set of C/C++ files, an Android.mk and an Application.mk file that are used by the NDK's ndk-build tool to generate one or more shared objects.


  • name (required) #

    The name of the rule.

  • srcs (defaults to [**/*.{cpp,c,cc,cxx,h,hpp,mk}]) #

    The set of files to compile for this rule. If not provided, buck assumes that all files with the following extensions are part of the build: c, cpp, cc, cxx, h, hpp, mk.

  • deps (defaults to []) #

    List of build targets to build before this rule.

  • flags (defaults to []) #

    Array of strings passed verbatim to ndk-build. Normally this is not needed, but in some cases you may want to put something here. For example, this can be used to build the libraries in debug mode (NDK_DEBUG=1) or set the number of jobs spawned by ndk-build (by default, the same as the number of cores).

  • is_asset (defaults to False) #

    Normally native shared objects end up in a directory in the root of the APK named lib/. If this parameter is set to True, then these objects are placed in assets/lib/. Placing shared objects in a non-standard location prevents Android from extracting them to the device's internal storage.

  • visibility (defaults to []) #

    List of build target patterns that identify the build rules that can include this rule in its deps.

  • 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.

An android_binary() that includes this library will aggregate all of the native shared objects into a directory in the root of the APK named lib/ or assets/lib/.

Unlike the default invocation of ndk-build, buck will put all intermediate files and build output into a subdirectory under buck-out/gen.