Add unstable `-Z direct-access-external-data` cmdline flag for `rustc`

The new flag has been described in the Major Change Proposal at
https://github.com/rust-lang/compiler-team/issues/707

2 files changed, 9 insertions, 0 deletions

diff --git a/compiler/rustc_session/src/options.rs b/compiler/rustc_session/src/options.rs
index c97b18ebd66..ff8c5f4b356 100644
--- a/compiler/rustc_session/src/options.rs
+++ b/compiler/rustc_session/src/options.rs
@@ -1553,6 +1553,8 @@ options! {
     dep_info_omit_d_target: bool = (false, parse_bool, [TRACKED],
         "in dep-info output, omit targets for tracking dependencies of the dep-info files \
         themselves (default: no)"),
+    direct_access_external_data: Option<bool> = (None, parse_opt_bool, [TRACKED],
+        "Direct or use GOT indirect to reference external data symbols"),
     dual_proc_macros: bool = (false, parse_bool, [TRACKED],
         "load proc macros for both target and host, but only link to the target (default: no)"),
     dump_dep_graph: bool = (false, parse_bool, [UNTRACKED],
diff --git a/compiler/rustc_session/src/session.rs b/compiler/rustc_session/src/session.rs
index 720599f6095..392485e2238 100644
--- a/compiler/rustc_session/src/session.rs
+++ b/compiler/rustc_session/src/session.rs
@@ -793,6 +793,13 @@ impl Session {
         self.opts.unstable_opts.tls_model.unwrap_or(self.target.tls_model)
     }
 
+    pub fn direct_access_external_data(&self) -> Option<bool> {
+        self.opts
+            .unstable_opts
+            .direct_access_external_data
+            .or(self.target.direct_access_external_data)
+    }
+
     pub fn split_debuginfo(&self) -> SplitDebuginfo {
         self.opts.cg.split_debuginfo.unwrap_or(self.target.split_debuginfo)
     }