Rollup merge of #122422 - Enselic:only-unix, r=oli-obk

compiletest: Allow `only-unix` in test headers

The header `ignore-unix` is already allowed. Also extend tests.

This is needed by #121573 which I am splitting up into smaller and more digestible PRs.

src/tools/compiletest/src/header.rs

@@ -852,6 +852,7 @@ const KNOWN_DIRECTIVE_NAMES: &[&str] = &[
     "only-sparc64",
     "only-stable",
     "only-thumb",
+    "only-unix",
     "only-wasm32",
     "only-wasm32-bare",
     "only-windows",

src/tools/compiletest/src/header/tests.rs

@@ -285,6 +285,7 @@ fn ignore_target() {
     assert!(check_ignore(&config, "//@ ignore-x86_64-unknown-linux-gnu"));
     assert!(check_ignore(&config, "//@ ignore-x86_64"));
     assert!(check_ignore(&config, "//@ ignore-linux"));
+    assert!(check_ignore(&config, "//@ ignore-unix"));
     assert!(check_ignore(&config, "//@ ignore-gnu"));
     assert!(check_ignore(&config, "//@ ignore-64bit"));
 
@@ -300,6 +301,7 @@ fn only_target() {
 
     assert!(check_ignore(&config, "//@ only-x86"));
     assert!(check_ignore(&config, "//@ only-linux"));
+    assert!(check_ignore(&config, "//@ only-unix"));
     assert!(check_ignore(&config, "//@ only-msvc"));
     assert!(check_ignore(&config, "//@ only-32bit"));