hello example breaks with newer deps

[mobileink]

Upgrading the deps for the hello_cargo_library example to log = "0.4.8" and fern = "0.6.0" results in:

error[E0425]: cannot find function set_boxed_logger in module log
--> cargo/vendor/fern-0.6.0/src/builders.rs:607:14
|
607 | log::set_boxed_logger(log)?;
| ^^^^^^^^^^^^^^^^ not found in log

According to the log doc, "The set_boxed_logger function is available with the std Cargo feature". Ok, cargo/vendor/log-0.4.8/BUILD.bazel has:
crate_features = [
"std",
],

Which looks about right to me (who have no experience with Rust but a fair amount of Bazel experience). So I added the same attrib to the root BUILD.bazel file; this had no discernable effect. According to the cargo-raze docs, I should see -cfg feature="std" in the compile command, but I don't. So I tried to use rustc_flags, but that attrib seems to have no effect, no matter what I put in it.

I hope this is resolvable, I'd really like to use rules_rust to bazelize a library.

Thanks, Gregg

The compile command:

/usr/bin/sandbox-exec -f /private/var/tmp/_bazel_gar/dce27a209127ac639b3875f03006c533/sandbox/darwin-sandbox/10/sandbox.sb /var/tmp/_bazel_gar/install/1d6d7a22a62da56414387a04bacbf619/process-wrapper '--timeout=0' '--kill_delay=15' /bin/bash -c 'CARGO_MANIFEST_DIR=$(pwd)/cargo/vendor/fern-0.6.0 external/rust_darwin_x86_64/bin/rustc "$@" --remap-path-prefix="$(pwd)"=__bazel_redacted_pwd' '' cargo/vendor/fern-0.6.0/src/lib.rs '--crate-name=fern' '--crate-type=lib' '--codegen=metadata=-222811272' '--out-dir=bazel-out/darwin-fastbuild/bin/cargo/vendor/fern-0.6.0' '--codegen=extra-filename=-222811272' '--codegen=opt-level=0' '--codegen=debuginfo=0' '--emit=dep-info,link' '--color=always' '--target=x86_64-apple-darwin' '--cap-lints=allow' '--edition=2018' '--codegen=linker=external/local_config_cc/cc_wrapper.sh' --codegen 'link-args=-lc++ -fobjc-link-runtime -headerpad_max_install_names -no-canonical-prefixes -mmacosx-version-min=10.15' --extern 'log=bazel-out/darwin-fastbuild/bin/cargo/vendor/log-0.4.8/liblog--2139748863.rlib' '-Ldependency=bazel-out/darwin-fastbuild/bin/cargo/vendor/log-0.4.8' '-Ldependency=bazel-out/darwin-fastbuild/bin/cargo/vendor/cfg-if-0.1.2')

[Arm1stice]

This seems to be a duplicate of #110. Adding the following to your Cargo.toml and re-running cargo raze should let you build:

[raze.crates.log.'0.4.8']
additional_flags = [
    "--cfg=atomic_cas"
]