0

Bazel rules can compose other bazel rules. For example: 

def cpp_library(name,deps=[]):

    explicit_cpp_file = name + ".cpp"
    explicit_hpp_file = name + ".hpp"

    native.cc_library(
        name = name,
        srcs = [explicit_cpp_file],
        hdrs = [explicit_hpp_file],
        deps = deps,
    )

Here we see that the cpp_library uses native.cc_library.
Is there a way to use a bazel query to print this relationship information?

You can imagine the difficulty of wanting to know which rules are used by which other rules as a project grows in size and many rules are available.

Trevor Hickey
  • 36,288
  • 32
  • 162
  • 271
  • One nitpick: rules (i.e. Starlark rules) can't compose other rules directly, but macros can compose rules. – ahumesky Feb 26 '19 at 21:48

1 Answers1

0

You can get this information through bazel query with --output. --output build will show the rules after macros have been run. --output graph will show the relationships between rules, e.g. 

bazel query //some/package --output graph | xdot

(or e.g. | dot -Tpng > /tmp/dep.png)

See https://docs.bazel.build/versions/master/query.html#output-formats

ahumesky
  • 4,203
  • 8
  • 12