env["LIBRARY_PATH"] = os.path.join(self.bin_root(), "lib") + \
(os.pathsep + env["LIBRARY_PATH"]) \
if "LIBRARY_PATH" in env else ""
- env["RUSTFLAGS"] = "-Cdebuginfo=2 "
+ # preserve existing RUSTFLAGS
+ env.setdefault("RUSTFLAGS", "")
+ env["RUSTFLAGS"] += " -Cdebuginfo=2"
build_section = "target.{}".format(self.build_triple())
target_features = []
elif self.get_toml("crt-static", build_section) == "false":
target_features += ["-crt-static"]
if target_features:
- env["RUSTFLAGS"] += "-C target-feature=" + (",".join(target_features)) + " "
+ env["RUSTFLAGS"] += " -C target-feature=" + (",".join(target_features))
target_linker = self.get_toml("linker", build_section)
if target_linker is not None:
- env["RUSTFLAGS"] += "-C linker=" + target_linker + " "
- env["RUSTFLAGS"] += " -Wrust_2018_idioms -Wunused_lifetimes "
+ env["RUSTFLAGS"] += " -C linker=" + target_linker
+ env["RUSTFLAGS"] += " -Wrust_2018_idioms -Wunused_lifetimes"
if self.get_toml("deny-warnings", "rust") != "false":
- env["RUSTFLAGS"] += "-Dwarnings "
+ env["RUSTFLAGS"] += " -Dwarnings"
env["PATH"] = os.path.join(self.bin_root(), "bin") + \
os.pathsep + env["PATH"]