Re: [PATCH v4 5/5] Makefile: add option to build and test libgit-rs and libgit-rs-sys

[Junio C Hamano <gitster@pobox.com>]

Josh Steadmon <steadmon@google.com> writes:

> Add environment variable, INCLUDE_LIBGIT_RS, that when set,
> automatically builds and tests libgit-rs and libgit-rs-sys when `make
> all` is ran.

Is this unusual, or is it just like how other makefile macros like
say USE_NSEC (to cause the resulting Git to use subsecond mtimes)
are meant to be used to control the build?  IOW, shouldn't this be
documented near the top of the Makefile, e.g.

    diff --git i/Makefile w/Makefile
    index 41ad458aef..2b55fe9672 100644
    --- i/Makefile
    +++ w/Makefile
    @@ -392,6 +392,9 @@ include shared.mak
     # INSTALL_STRIP can be set to "-s" to strip binaries during installation,
     # if your $(INSTALL) command supports the option.
     #
    +# Define INCLUDE_LIBGIT_RS if you want your gostak to distim
    +# the doshes and ...
    +#
     # Define GENERATE_COMPILATION_DATABASE to "yes" to generate JSON compilation
     # database entries during compilation if your compiler supports it, using the
     # `-MJ` flag. The JSON entries will be placed in the `compile_commands/`

It might make sense to follow naming convention to call it NO_RUST
and flip its polarity.  Those who do not have or want libgit-rs and
friends can say NO_RUST but otherwise it gets built by default.  It
would give you a wider developer population coverage.

Thanks.