Use parse_target_triple in rustdoc

Author: bjorn3

compiler/rustc_session/src/config.rs

@@ -1507,7 +1507,10 @@ fn collect_print_requests(
     prints
 }
 
-fn parse_target_triple(matches: &getopts::Matches, error_format: ErrorOutputType) -> TargetTriple {
+pub fn parse_target_triple(
+    matches: &getopts::Matches,
+    error_format: ErrorOutputType,
+) -> TargetTriple {
     match matches.opt_str("target") {
         Some(target) if target.ends_with(".json") => {
             let path = Path::new(&target);

src/librustdoc/config.rs

@@ -6,8 +6,10 @@ use std::path::PathBuf;
 use std::str::FromStr;
 
 use rustc_data_structures::fx::FxHashMap;
-use rustc_session::config::{self, parse_crate_types_from_list, parse_externs, CrateType};
-use rustc_session::config::{get_cmd_lint_options, host_triple, nightly_options};
+use rustc_session::config::{
+    self, parse_crate_types_from_list, parse_externs, parse_target_triple, CrateType,
+};
+use rustc_session::config::{get_cmd_lint_options, nightly_options};
 use rustc_session::config::{CodegenOptions, DebuggingOptions, ErrorOutputType, Externs};
 use rustc_session::getopts;
 use rustc_session::lint::Level;
@@ -562,14 +564,7 @@ impl Options {
             }
         }
 
-        let target =
-            matches.opt_str("target").map_or(TargetTriple::from_triple(host_triple()), |target| {
-                if target.ends_with(".json") {
-                    TargetTriple::from_path(Path::new(&target))
-                } else {
-                    TargetTriple::TargetTriple(target)
-                }
-            });
+        let target = parse_target_triple(matches, error_format);
 
         let show_coverage = matches.opt_present("show-coverage");