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Allow NIX_* environment variables to be passed to rustc #466

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Allow NIX_* environment variables to be passed to rustc #466

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34 changes: 34 additions & 0 deletions prelude/rust/tools/rustc_action.py
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Original file line number Diff line number Diff line change
Expand Up @@ -30,6 +30,39 @@

DEBUG = False

NIX_ENV_VARS = [
"NIX_BINTOOLS",
"NIX_BINTOOLS_FOR_TARGET",
"NIX_CC",
"NIX_CC_FOR_TARGET",
"NIX_CFLAGS_COMPILE",
"NIX_CFLAGS_COMPILE_FOR_TARGET",
"NIX_COREFOUNDATION_RPATH",
"NIX_DONT_SET_RPATH",
"NIX_DONT_SET_RPATH_FOR_BUILD",
"NIX_ENFORCE_NO_NATIVE",
"NIX_HARDENING_ENABLE",
"NIX_IGNORE_LD_THROUGH_GCC",
"NIX_LDFLAGS",
"NIX_LDFLAGS_FOR_TARGET",
"NIX_NO_SELF_RPATH",
]
NIX_ENV_VAR_PREFIXES = [
"NIX_BINTOOLS_WRAPPER_TARGET_HOST_",
"NIX_BINTOOLS_WRAPPER_TARGET_TARGET_",
"NIX_CC_WRAPPER_TARGET_HOST_",
"NIX_CC_WRAPPER_TARGET_TARGET_",
]


def nix_env(env: Dict[str, str]):
env.update({k: os.environ[k] for k in NIX_ENV_VARS if k in os.environ})
for prefix in NIX_ENV_VAR_PREFIXES:
vars_starting_with = dict(
filter(lambda pair: pair[0].startswith(prefix),
os.environ.items()))
env.update({k: v for k, v in vars_starting_with.items()})


def eprint(*args: Any, **kwargs: Any) -> None:
print(*args, end="\n", file=sys.stderr, flush=True, **kwargs)
Expand Down Expand Up @@ -259,6 +292,7 @@ async def main() -> int:
]
if k in os.environ
}
nix_env(env)
if args.env:
# Unescape previously escaped newlines.
# Example: \\\\n\\n -> \\\n\n -> \\n\n
Expand Down