Migration from CMake to Bazel

[qzwxsaedc]

I have a CMake project and I want to migration it to bazel. 

In original CMake project, I have some components which can be compiled as an executable or as a static library with certain conditions enabled.

For example:

if(SOME_FLAG)

    add_executable(hello main.cpp lib.cpp)

else()

    add_library( hello STATIC lib.cpp)

endif()

...

In other words, I hope the following conditions to be met:

1. Choose whether to compile into an executable or a library by label provided on ctl.
2. If output an executable, the name should be "hello"(in this case). If output a static library, the name should be "libhello.a"(in this case).

genrule is a solution, but I want to implement it by rule like:

my_cc_binary_or_library(

    name = "hello",

    target = select({":library": "static_library", ":binary": "binary"}),

    hdrs = [...] # enable when target is "static_library" or "dynamic_library"

    ...

)

I want to reference to cc_binary and cc_library, but they use private API.