cargo: Use --env-set when we have nightly rustc

1 files changed, 9 insertions, 0 deletions

diff --git a/mesonbuild/compilers/rust.py b/mesonbuild/compilers/rust.py
index 39280d584..fadf9772f 100644
--- a/mesonbuild/compilers/rust.py
+++ b/mesonbuild/compilers/rust.py
@@ -399,6 +399,15 @@ class RustCompiler(Compiler):
                                    self.is_cross, self.info, full_version=self.full_version,
                                    linker=self.linker, rustc=self)
 
+    def enable_env_set_args(self) -> T.Optional[T.List[str]]:
+        '''Extra arguments to enable --env-set support in rustc.
+        Returns None if not supported.
+        '''
+        if version_compare(self.version, '>= 1.76') and self.allow_nightly:
+            return ['-Z', 'unstable-options']
+        return None
+
+
 class ClippyRustCompiler(RustCompiler):
 
     """Clippy is a linter that wraps Rustc.