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Set LD_LIBRARY_PATH to point at rustc's library directory. #195

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Set LD_LIBRARY_PATH to point at rustc's library directory. #195

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25 changes: 24 additions & 1 deletion cc_bindings_from_rs/bazel_support/cc_bindings_from_rust_rule.bzl
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Original file line number Diff line number Diff line change
Expand Up @@ -103,6 +103,29 @@ def _target_name_to_include_guard(target):
for c in (target.label.package + "/" + target.label.name).upper().elems()
])

def _rustc_lib_env(ctx):
"""Returns an environment that sets the dylib search path to include rustc libraries.

This is needed in bazel where rustc_private dynamically links against librustc_driver.
Internally, we statically link against the compiler so this isn't an issue. If the path to
rustc's libraries cannot be determined this returns an empty dictionary.

Args:
ctx: The rule context.

Returns:
A dictionary of environment variables to set.
"""
rust_toolchain = ctx.toolchains["@rules_rust//rust:toolchain_type"]
if rust_toolchain == None:
return {}
rustc_lib = rust_toolchain.rustc_lib.to_list()
if len(rustc_lib) <= 0:
return {}
return {
"LD_LIBRARY_PATH": rustc_lib[0].dirname,
}

def _generate_bindings(ctx, target, basename, inputs, args, rustc_env, proto_crate_renames):
"""Invokes the `cc_bindings_from_rs` tool to generate C++ bindings for a Rust crate.

Expand Down Expand Up @@ -188,7 +211,7 @@ def _generate_bindings(ctx, target, basename, inputs, args, rustc_env, proto_cra
[ctx.file._clang_format, ctx.file._rustfmt, ctx.file._rustfmt_cfg],
transitive = [inputs],
),
env = rustc_env | verbose_log_env,
env = rustc_env | verbose_log_env | _rustc_lib_env(ctx),
tools = [toolchain.binary],
executable = ctx.executable._process_wrapper,
mnemonic = "CcBindingsFromRust",
Expand Down