Implement RFC 2951: Native link modifiers

This commit implements both the native linking modifiers infrastructure
as well as an initial attempt at the individual modifiers from the RFC.
It also introduces a feature flag for the general syntax along with
individual feature flags for each modifier.

13 files changed, 108 insertions, 2 deletions

diff --git a/src/test/ui/feature-gates/feature-gate-native_link_modifiers.rs b/src/test/ui/feature-gates/feature-gate-native_link_modifiers.rs
new file mode 100644
index 00000000000..2d00aa2a3cf
--- /dev/null
+++ b/src/test/ui/feature-gates/feature-gate-native_link_modifiers.rs
@@ -0,0 +1,5 @@
+#[link(name = "foo", modifiers = "")]
+//~^ ERROR: native link modifiers are experimental
+extern "C" {}
+
+fn main() {}
diff --git a/src/test/ui/feature-gates/feature-gate-native_link_modifiers.stderr b/src/test/ui/feature-gates/feature-gate-native_link_modifiers.stderr
new file mode 100644
index 00000000000..20a2d6a26fa
--- /dev/null
+++ b/src/test/ui/feature-gates/feature-gate-native_link_modifiers.stderr
@@ -0,0 +1,12 @@
+error[E0658]: native link modifiers are experimental
+  --> $DIR/feature-gate-native_link_modifiers.rs:1:22
+   |
+LL | #[link(name = "foo", modifiers = "")]
+   |                      ^^^^^^^^^^^^^^
+   |
+   = note: see issue #81490 <https://github.com/rust-lang/rust/issues/81490> for more information
+   = help: add `#![feature(native_link_modifiers)]` to the crate attributes to enable
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0658`.
diff --git a/src/test/ui/feature-gates/feature-gate-native_link_modifiers_as_needed.rs b/src/test/ui/feature-gates/feature-gate-native_link_modifiers_as_needed.rs
new file mode 100644
index 00000000000..4cf8067592e
--- /dev/null
+++ b/src/test/ui/feature-gates/feature-gate-native_link_modifiers_as_needed.rs
@@ -0,0 +1,8 @@
+#![allow(incomplete_features)]
+#![feature(native_link_modifiers)]
+
+#[link(name = "foo", modifiers = "+as-needed")]
+//~^ ERROR: `#[link(modifiers="as-needed")]` is unstable
+extern "C" {}
+
+fn main() {}
diff --git a/src/test/ui/feature-gates/feature-gate-native_link_modifiers_as_needed.stderr b/src/test/ui/feature-gates/feature-gate-native_link_modifiers_as_needed.stderr
new file mode 100644
index 00000000000..08ce807851b
--- /dev/null
+++ b/src/test/ui/feature-gates/feature-gate-native_link_modifiers_as_needed.stderr
@@ -0,0 +1,12 @@
+error[E0658]: `#[link(modifiers="as-needed")]` is unstable
+  --> $DIR/feature-gate-native_link_modifiers_as_needed.rs:4:34
+   |
+LL | #[link(name = "foo", modifiers = "+as-needed")]
+   |                                  ^^^^^^^^^^^^
+   |
+   = note: see issue #81490 <https://github.com/rust-lang/rust/issues/81490> for more information
+   = help: add `#![feature(native_link_modifiers_as_needed)]` to the crate attributes to enable
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0658`.
diff --git a/src/test/ui/feature-gates/feature-gate-native_link_modifiers_bundle.rs b/src/test/ui/feature-gates/feature-gate-native_link_modifiers_bundle.rs
new file mode 100644
index 00000000000..b2b1dc28e47
--- /dev/null
+++ b/src/test/ui/feature-gates/feature-gate-native_link_modifiers_bundle.rs
@@ -0,0 +1,8 @@
+#![allow(incomplete_features)]
+#![feature(native_link_modifiers)]
+
+#[link(name = "foo", modifiers = "+bundle")]
+//~^ ERROR: `#[link(modifiers="bundle")]` is unstable
+extern "C" {}
+
+fn main() {}
diff --git a/src/test/ui/feature-gates/feature-gate-native_link_modifiers_bundle.stderr b/src/test/ui/feature-gates/feature-gate-native_link_modifiers_bundle.stderr
new file mode 100644
index 00000000000..b3e22b0644a
--- /dev/null
+++ b/src/test/ui/feature-gates/feature-gate-native_link_modifiers_bundle.stderr
@@ -0,0 +1,12 @@
+error[E0658]: `#[link(modifiers="bundle")]` is unstable
+  --> $DIR/feature-gate-native_link_modifiers_bundle.rs:4:34
+   |
+LL | #[link(name = "foo", modifiers = "+bundle")]
+   |                                  ^^^^^^^^^
+   |
+   = note: see issue #81490 <https://github.com/rust-lang/rust/issues/81490> for more information
+   = help: add `#![feature(native_link_modifiers_bundle)]` to the crate attributes to enable
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0658`.
diff --git a/src/test/ui/feature-gates/feature-gate-native_link_modifiers_verbatim.rs b/src/test/ui/feature-gates/feature-gate-native_link_modifiers_verbatim.rs
new file mode 100644
index 00000000000..042ce0b3f65
--- /dev/null
+++ b/src/test/ui/feature-gates/feature-gate-native_link_modifiers_verbatim.rs
@@ -0,0 +1,8 @@
+#![allow(incomplete_features)]
+#![feature(native_link_modifiers)]
+
+#[link(name = "foo", modifiers = "+verbatim")]
+//~^ ERROR: `#[link(modifiers="verbatim")]` is unstable
+extern "C" {}
+
+fn main() {}
diff --git a/src/test/ui/feature-gates/feature-gate-native_link_modifiers_verbatim.stderr b/src/test/ui/feature-gates/feature-gate-native_link_modifiers_verbatim.stderr
new file mode 100644
index 00000000000..8159416edfa
--- /dev/null
+++ b/src/test/ui/feature-gates/feature-gate-native_link_modifiers_verbatim.stderr
@@ -0,0 +1,12 @@
+error[E0658]: `#[link(modifiers="verbatim")]` is unstable
+  --> $DIR/feature-gate-native_link_modifiers_verbatim.rs:4:34
+   |
+LL | #[link(name = "foo", modifiers = "+verbatim")]
+   |                                  ^^^^^^^^^^^
+   |
+   = note: see issue #81490 <https://github.com/rust-lang/rust/issues/81490> for more information
+   = help: add `#![feature(native_link_modifiers_verbatim)]` to the crate attributes to enable
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0658`.
diff --git a/src/test/ui/feature-gates/feature-gate-native_link_modifiers_whole_archive.rs b/src/test/ui/feature-gates/feature-gate-native_link_modifiers_whole_archive.rs
new file mode 100644
index 00000000000..ca801e59114
--- /dev/null
+++ b/src/test/ui/feature-gates/feature-gate-native_link_modifiers_whole_archive.rs
@@ -0,0 +1,8 @@
+#![allow(incomplete_features)]
+#![feature(native_link_modifiers)]
+
+#[link(name = "foo", modifiers = "+whole-archive")]
+//~^ ERROR: `#[link(modifiers="whole-archive")]` is unstable
+extern "C" {}
+
+fn main() {}
diff --git a/src/test/ui/feature-gates/feature-gate-native_link_modifiers_whole_archive.stderr b/src/test/ui/feature-gates/feature-gate-native_link_modifiers_whole_archive.stderr
new file mode 100644
index 00000000000..cacaa789ecb
--- /dev/null
+++ b/src/test/ui/feature-gates/feature-gate-native_link_modifiers_whole_archive.stderr
@@ -0,0 +1,12 @@
+error[E0658]: `#[link(modifiers="whole-archive")]` is unstable
+  --> $DIR/feature-gate-native_link_modifiers_whole_archive.rs:4:34
+   |
+LL | #[link(name = "foo", modifiers = "+whole-archive")]
+   |                                  ^^^^^^^^^^^^^^^^
+   |
+   = note: see issue #81490 <https://github.com/rust-lang/rust/issues/81490> for more information
+   = help: add `#![feature(native_link_modifiers_whole_archive)]` to the crate attributes to enable
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0658`.
diff --git a/src/test/ui/feature-gates/feature-gate-static-nobundle-2.stderr b/src/test/ui/feature-gates/feature-gate-static-nobundle-2.stderr
index d96a48cde9f..301a1e1341e 100644
--- a/src/test/ui/feature-gates/feature-gate-static-nobundle-2.stderr
+++ b/src/test/ui/feature-gates/feature-gate-static-nobundle-2.stderr
@@ -1,3 +1,5 @@
+warning: library kind `static-nobundle` has been superseded by specifying `-bundle` on library kind `static`. Try `static:-bundle`
+
 error[E0658]: kind="static-nobundle" is unstable
    |
    = note: see issue #37403 <https://github.com/rust-lang/rust/issues/37403> for more information
diff --git a/src/test/ui/feature-gates/feature-gate-static-nobundle.rs b/src/test/ui/feature-gates/feature-gate-static-nobundle.rs
index 05c52f9dbea..e4bfe8e8e05 100644
--- a/src/test/ui/feature-gates/feature-gate-static-nobundle.rs
+++ b/src/test/ui/feature-gates/feature-gate-static-nobundle.rs
@@ -1,5 +1,6 @@
 #[link(name = "foo", kind = "static-nobundle")]
-//~^ ERROR: kind="static-nobundle" is unstable
+//~^ WARNING: library kind `static-nobundle` has been superseded by specifying modifier `-bundle` with library kind `static`
+//~^^ ERROR: kind="static-nobundle" is unstable
 extern "C" {}
 
 fn main() {}
diff --git a/src/test/ui/feature-gates/feature-gate-static-nobundle.stderr b/src/test/ui/feature-gates/feature-gate-static-nobundle.stderr
index 3a3c86c3429..9695618207c 100644
--- a/src/test/ui/feature-gates/feature-gate-static-nobundle.stderr
+++ b/src/test/ui/feature-gates/feature-gate-static-nobundle.stderr
@@ -1,3 +1,9 @@
+warning: library kind `static-nobundle` has been superseded by specifying modifier `-bundle` with library kind `static`
+  --> $DIR/feature-gate-static-nobundle.rs:1:22
+   |
+LL | #[link(name = "foo", kind = "static-nobundle")]
+   |                      ^^^^^^^^^^^^^^^^^^^^^^^^
+
 error[E0658]: kind="static-nobundle" is unstable
   --> $DIR/feature-gate-static-nobundle.rs:1:1
    |
@@ -7,6 +13,6 @@ LL | #[link(name = "foo", kind = "static-nobundle")]
    = note: see issue #37403 <https://github.com/rust-lang/rust/issues/37403> for more information
    = help: add `#![feature(static_nobundle)]` to the crate attributes to enable
 
-error: aborting due to previous error
+error: aborting due to previous error; 1 warning emitted
 
 For more information about this error, try `rustc --explain E0658`.