Conditional defines

This example demonstrates how you may conditionally have -Dxxx based on a CONFIG_. It may be helpful if you are converting a legacy kernel_module with Kbuild containing lines like this:

ccflags-$(CONFIG_DDK_EXAMPLE_FOO_DEBUG) := -DDEBUG

Explanation

To achieve the above result, do the following:

1. Add a file, debug.h, that contains the shown content.
2. In BUILD.bazel, do the following:
   1. Add debug.h to srcs
   2. Include debug.h. There are two ways to do this:
      1. Add ["-include", "$(location debug.h)"] to copts; OR
      2. Add #include "debug.h" to foo.c directly. See local_includes for details on including local headers.

Full sources

Full sources of this example are in this directory.