Add test for cargo:rustc-link-arg-bin=foo=--bar

Author: Dirbaio

tests/testsuite/build_script_extra_link_arg.rs

@@ -26,6 +26,49 @@ fn build_script_extra_link_arg_bin() {
         .run();
 }
 
+#[cargo_test]
+fn build_script_extra_link_arg_bin_single() {
+    let p = project()
+        .file(
+            "Cargo.toml",
+            r#"
+                [package]
+
+                name = "foobar"
+                version = "0.5.0"
+                authors = ["wycats@example.com"]
+
+                [[bin]]
+                name = "foo"
+                [[bin]]
+                name = "bar"
+            "#,
+        )
+        .file("src/main.rs", "fn main() {}")
+        .file(
+            "build.rs",
+            r#"
+                fn main() {
+                    println!("cargo:rustc-link-arg-bins=--bogus-flag-all");
+                    println!("cargo:rustc-link-arg-bin=foo=--bogus-flag-foo");
+                    println!("cargo:rustc-link-arg-bin=bar=--bogus-flag-bar");
+                }
+            "#,
+        )
+        .build();
+
+    p.cargo("build -Zextra-link-arg -v")
+        .masquerade_as_nightly_cargo()
+        .without_status()
+        .with_stderr_contains(
+            "[RUNNING] `rustc --crate-name foo [..]-C link-arg=--bogus-flag-all -C link-arg=--bogus-flag-foo[..]",
+        )
+        .with_stderr_contains(
+            "[RUNNING] `rustc --crate-name bar [..]-C link-arg=--bogus-flag-all -C link-arg=--bogus-flag-bar[..]",
+        )
+        .run();
+}
+
 #[cargo_test]
 fn build_script_extra_link_arg() {
     let p = project()