Lib kind -l link-arg:

arbitrary link argument like -C link-arg, but respecting relative order to other `-l` options, unstable

2 files changed, 19 insertions, 3 deletions

diff --git a/compiler/rustc_session/src/config.rs b/compiler/rustc_session/src/config.rs
index 55307b9cebb..0c3322a7953 100644
--- a/compiler/rustc_session/src/config.rs
+++ b/compiler/rustc_session/src/config.rs
@@ -1942,9 +1942,22 @@ fn parse_native_lib_kind(
         "static" => NativeLibKind::Static { bundle: None, whole_archive: None },
         "dylib" => NativeLibKind::Dylib { as_needed: None },
         "framework" => NativeLibKind::Framework { as_needed: None },
+        "link-arg" => {
+            if !nightly_options::is_unstable_enabled(matches) {
+                let why = if nightly_options::match_is_nightly_build(matches) {
+                    " and only accepted on the nightly compiler"
+                } else {
+                    ", the `-Z unstable-options` flag must also be passed to use it"
+                };
+                early_error(error_format, &format!("library kind `link-arg` is unstable{why}"))
+            }
+            NativeLibKind::LinkArg
+        }
         _ => early_error(
             error_format,
-            &format!("unknown library kind `{kind}`, expected one of: static, dylib, framework"),
+            &format!(
+                "unknown library kind `{kind}`, expected one of: static, dylib, framework, link-arg"
+            ),
         ),
     };
     match modifiers {
@@ -2043,7 +2056,7 @@ fn parse_libs(matches: &getopts::Matches, error_format: ErrorOutputType) -> Vec<
         .into_iter()
         .map(|s| {
             // Parse string of the form "[KIND[:MODIFIERS]=]lib[:new_name]",
-            // where KIND is one of "dylib", "framework", "static" and
+            // where KIND is one of "dylib", "framework", "static", "link-arg" and
             // where MODIFIERS are  a comma separated list of supported modifiers
             // (bundle, verbatim, whole-archive, as-needed). Each modifier is prefixed
             // with either + or - to indicate whether it is enabled or disabled.
diff --git a/compiler/rustc_session/src/utils.rs b/compiler/rustc_session/src/utils.rs
index bda7b314308..9a4f6f9f9ef 100644
--- a/compiler/rustc_session/src/utils.rs
+++ b/compiler/rustc_session/src/utils.rs
@@ -34,6 +34,9 @@ pub enum NativeLibKind {
         /// Whether the framework will be linked only if it satisfies some undefined symbols
         as_needed: Option<bool>,
     },
+    /// Argument which is passed to linker, relative order with libraries and other arguments
+    /// is preserved
+    LinkArg,
     /// The library kind wasn't specified, `Dylib` is currently used as a default.
     Unspecified,
 }
@@ -47,7 +50,7 @@ impl NativeLibKind {
             NativeLibKind::Dylib { as_needed } | NativeLibKind::Framework { as_needed } => {
                 as_needed.is_some()
             }
-            NativeLibKind::RawDylib | NativeLibKind::Unspecified => false,
+            NativeLibKind::RawDylib | NativeLibKind::Unspecified | NativeLibKind::LinkArg => false,
         }
     }
 }