Gate binary dependency information behind -Zbinary-dep-depinfo

Author: Mark-Simulacrum

src/librustc/session/config.rs

@@ -1468,6 +1468,8 @@ options! {DebuggingOptions, DebuggingSetter, basic_debugging_options,
     symbol_mangling_version: SymbolManglingVersion = (SymbolManglingVersion::Legacy,
         parse_symbol_mangling_version, [TRACKED],
         "which mangling version to use for symbol names"),
+    binary_dep_depinfo: bool = (false, parse_bool, [TRACKED],
+        "include artifacts (sysroot, crate dependencies) used during compilation in dep-info"),
 }
 
 pub fn default_lib_output() -> CrateType {

src/librustc/session/mod.rs

@@ -545,6 +545,9 @@ impl Session {
     pub fn print_llvm_passes(&self) -> bool {
         self.opts.debugging_opts.print_llvm_passes
     }
+    pub fn binary_dep_depinfo(&self) -> bool {
+        self.opts.debugging_opts.binary_dep_depinfo
+    }
 
     /// Gets the features enabled for the current compilation session.
     /// DO NOT USE THIS METHOD if there is a TyCtxt available, as it circumvents

src/librustc_interface/passes.rs

@@ -677,17 +677,19 @@ fn write_out_deps(compiler: &Compiler, outputs: &OutputFilenames, out_filenames:
             .map(|fmap| escape_dep_filename(&fmap.name))
             .collect();
 
-        for cnum in compiler.cstore.crates_untracked() {
-            let metadata = compiler.cstore.crate_data_as_rc_any(cnum);
-            let metadata = metadata.downcast_ref::<cstore::CrateMetadata>().unwrap();
-            if let Some((path, _)) = &metadata.source.dylib {
-                files.push(escape_dep_filename(&FileName::Real(path.clone())));
-            }
-            if let Some((path, _)) = &metadata.source.rlib {
-                files.push(escape_dep_filename(&FileName::Real(path.clone())));
-            }
-            if let Some((path, _)) = &metadata.source.rmeta {
-                files.push(escape_dep_filename(&FileName::Real(path.clone())));
+        if sess.binary_dep_depinfo() {
+            for cnum in compiler.cstore.crates_untracked() {
+                let metadata = compiler.cstore.crate_data_as_rc_any(cnum);
+                let metadata = metadata.downcast_ref::<cstore::CrateMetadata>().unwrap();
+                if let Some((path, _)) = &metadata.source.dylib {
+                    files.push(escape_dep_filename(&FileName::Real(path.clone())));
+                }
+                if let Some((path, _)) = &metadata.source.rlib {
+                    files.push(escape_dep_filename(&FileName::Real(path.clone())));
+                }
+                if let Some((path, _)) = &metadata.source.rmeta {
+                    files.push(escape_dep_filename(&FileName::Real(path.clone())));
+                }
             }
         }