Re: [PATCH 10/14] rust: add a build.rs script for tests

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

"brian m. carlson" <sandals@crustytoothpaste.net> writes:

> Cargo uses the build.rs script to determine how to compile and link a
> binary.  The only binary we're generating, however, is for our tests,
> but in a future commit, we're going to link against libgit.a for some
> functionality and we'll need to make sure the test binaries are
> complete.

OK.

> -$(RUST_LIB): Cargo.toml $(RUST_SOURCES)
> +$(RUST_LIB): Cargo.toml $(RUST_SOURCES) $(XDIFF_LIB) $(LIB_FILE) $(REFTABLE_LIB)
>  	$(QUIET_CARGO)cargo build $(CARGO_ARGS)
> ...
> +fn main() {
> +    println!("cargo::rustc-link-search=.");
> +    println!("cargo::rustc-link-search=reftable");
> +    println!("cargo::rustc-link-search=xdiff");
> +    println!("cargo::rustc-link-lib=git");
> +    println!("cargo::rustc-link-lib=reftable");
> +    println!("cargo::rustc-link-lib=z");
> +    println!("cargo::rustc-link-lib=xdiff");
> +}

Hmm, I recall Ezekiel earlier arguing to roll reftable and xdiff
libraries into libgit.a as it is a lot more cumbersome to have to
link with multiple libraries (sorry, I may be misremembering and do
not have reference handy), but if the above is all it takes to link
with these, perhaps it is not such a huge deal?

I am a bit confused.

XDIFF_LIB and REFTABLE_LIB are gone from Makefile on 'master'
already.  Perhaps we should revert earlier series from him?  

Thanks.