In Buck, how do I used the output of a genrule as a header for a cxx_library?

Question

I have a genrule that generates a C++ header-file using a proprietary tool. The header is then used in a cxx_library. Looking at code from this presentation, I have tried the following:

cxx_library(
  name = 'my-library',
  srcs = glob(['src/**/*.cpp']),
  exported_headers = {
    'my_header.h': genfile('my-header.h'),
  },
  ...

However, it seems that genfile has been deprecated. What should I use instead?

Answer 1

You just have to specify the build target of the genrule in place of genfile('my-header.h').

genrule(
  name='my-header',
  cmd='some_command.py',
  out='my-header.h',
)

cxx_library(
  name = 'my-library',
  srcs = glob(['src/**/*.cpp']),
  exported_headers = {
    'my_header.h': ':my-header',
  },
  ...
)