Auto merge of rust-lang#63827 - andjo403:out-of-process-rustc-in-rustdoc, r=Mark-Simulacrum

Run doctests via out-of-process rustc

closes rust-lang#63638

Author: bors

src/librustc_driver/lib.rs

@@ -439,6 +439,15 @@ fn make_input(free_matches: &[String]) -> Option<(Input, Option<PathBuf>, Option
             } else {
                 None
             };
+            if let Ok(path) = env::var("UNSTABLE_RUSTDOC_TEST_PATH") {
+                let line = env::var("UNSTABLE_RUSTDOC_TEST_LINE").
+                            expect("when UNSTABLE_RUSTDOC_TEST_PATH is set \
+                                    UNSTABLE_RUSTDOC_TEST_LINE also needs to be set");
+                let line = isize::from_str_radix(&line, 10).
+                            expect("UNSTABLE_RUSTDOC_TEST_LINE needs to be an number");
+                let file_name = FileName::doc_test_source_code(PathBuf::from(path), line);
+                return Some((Input::Str { name: file_name, input: src }, None, err));
+            }
             Some((Input::Str { name: FileName::anon_source_code(&src), input: src },
                   None, err))
         } else {

src/librustdoc/config.rs

@@ -39,12 +39,18 @@ pub struct Options {
     pub error_format: ErrorOutputType,
     /// Library search paths to hand to the compiler.
     pub libs: Vec<SearchPath>,
+    /// Library search paths strings to hand to the compiler.
+    pub lib_strs: Vec<String>,
     /// The list of external crates to link against.
     pub externs: Externs,
+    /// The list of external crates strings to link against.
+    pub extern_strs: Vec<String>,
     /// List of `cfg` flags to hand to the compiler. Always includes `rustdoc`.
     pub cfgs: Vec<String>,
     /// Codegen options to hand to the compiler.
     pub codegen_options: CodegenOptions,
+    /// Codegen options strings to hand to the compiler.
+    pub codegen_options_strs: Vec<String>,
     /// Debugging (`-Z`) options to pass to the compiler.
     pub debugging_options: DebuggingOptions,
     /// The target used to compile the crate against.
@@ -461,6 +467,9 @@ impl Options {
         let generate_search_filter = !matches.opt_present("disable-per-crate-search");
         let persist_doctests = matches.opt_str("persist-doctests").map(PathBuf::from);
         let generate_redirect_pages = matches.opt_present("generate-redirect-pages");
+        let codegen_options_strs = matches.opt_strs("C");
+        let lib_strs = matches.opt_strs("L");
+        let extern_strs = matches.opt_strs("extern");
 
         let (lint_opts, describe_lints, lint_cap) = get_cmd_lint_options(matches, error_format);
 
@@ -470,9 +479,12 @@ impl Options {
             proc_macro_crate,
             error_format,
             libs,
+            lib_strs,
             externs,
+            extern_strs,
             cfgs,
             codegen_options,
+            codegen_options_strs,
             debugging_options,
             target,
             edition,

src/librustdoc/markdown.rs

@@ -142,11 +142,8 @@ pub fn test(mut options: Options, diag: &errors::Handler) -> i32 {
     let mut opts = TestOptions::default();
     opts.no_crate_inject = true;
     opts.display_warnings = options.display_warnings;
-    let mut collector = Collector::new(options.input.display().to_string(), options.cfgs,
-                                       options.libs, options.codegen_options, options.externs,
-                                       true, opts, options.maybe_sysroot, None,
-                                       Some(options.input),
-                                       options.linker, options.edition, options.persist_doctests);
+    let mut collector = Collector::new(options.input.display().to_string(), options.clone(),
+                                       true, opts, None, Some(options.input));
     collector.set_position(DUMMY_SP);
     let codes = ErrorCodes::from(UnstableFeatures::from_environment().is_nightly_build());