ignore doctests only in specified targets

add necessary lines

fix ui test error

Author: TaKO8Ki

src/librustdoc/html/markdown.rs

@@ -1201,11 +1201,12 @@ impl LangString {
                         seen_rust_tags = !seen_other_tags;
                     }
                     LangStringToken::LangToken(x)
-                        if let Some(ignore) = x.strip_prefix("ignore-")
-                            && enable_per_target_ignores =>
+                        if let Some(ignore) = x.strip_prefix("ignore-") =>
                     {
-                        ignores.push(ignore.to_owned());
-                        seen_rust_tags = !seen_other_tags;
+                        if enable_per_target_ignores {
+                            ignores.push(ignore.to_owned());
+                            seen_rust_tags = !seen_other_tags;
+                        }
                     }
                     LangStringToken::LangToken("rust") => {
                         data.rust = true;

tests/rustdoc-ui/doctest/per-target-ignores.rs

@@ -0,0 +1,14 @@
+//@ only-aarch64
+//@ compile-flags:--test
+//@ normalize-stdout: "tests/rustdoc-ui/doctest" -> "$$DIR"
+//@ normalize-stdout: "finished in \d+\.\d+s" -> "finished in $$TIME"
+//@ check-pass
+
+///```ignore-x86_64
+/// assert!(cfg!(not(target_arch = "x86_64")));
+///```
+pub fn foo() -> u8 {
+    4
+}
+
+fn main() {}

tests/rustdoc-ui/doctest/per-target-ignores.stdout

@@ -0,0 +1,6 @@
+
+running 1 test
+test $DIR/per-target-ignores.rs - foo (line 7) ... ok
+
+test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in $TIME
+