Auto merge of #111626 - pjhades:output, r=b-naber

Write to stdout if `-` is given as output file

With this PR, if `-o -` or `--emit KIND=-` is provided, output will be written to stdout instead. Binary output (those of type `obj`, `llvm-bc`, `link` and `metadata`) being written this way will result in an error unless stdout is not a tty. Multiple output types going to stdout will trigger an error too, as they will all be mixded together.

This implements https://github.com/rust-lang/compiler-team/issues/431

The idea behind the changes is to introduce an `OutFileName` enum that represents the output - be it a real path or stdout - and to use this enum along the code paths that handle different output types.

1 files changed, 2 insertions, 2 deletions

diff --git a/compiler/rustc_interface/src/interface.rs b/compiler/rustc_interface/src/interface.rs
index 39d56897999..2edc72ba72e 100644
--- a/compiler/rustc_interface/src/interface.rs
+++ b/compiler/rustc_interface/src/interface.rs
@@ -14,7 +14,7 @@ use rustc_middle::{bug, ty};
 use rustc_parse::maybe_new_parser_from_source_str;
 use rustc_query_impl::QueryCtxt;
 use rustc_query_system::query::print_query_stack;
-use rustc_session::config::{self, ErrorOutputType, Input, OutputFilenames};
+use rustc_session::config::{self, ErrorOutputType, Input, OutFileName, OutputFilenames};
 use rustc_session::config::{CheckCfg, ExpectedValues};
 use rustc_session::lint;
 use rustc_session::parse::{CrateConfig, ParseSess};
@@ -252,7 +252,7 @@ pub struct Config {
 
     pub input: Input,
     pub output_dir: Option<PathBuf>,
-    pub output_file: Option<PathBuf>,
+    pub output_file: Option<OutFileName>,
     pub file_loader: Option<Box<dyn FileLoader + Send + Sync>>,
     pub locale_resources: &'static [&'static str],