Auto merge of #125579 - Noratrieb:print-host, r=davidtwco

Add `--print host-tuple` to print host target tuple

People often parse `-vV` output to get to the host tuple, which is annoying to do. It's easier to just get it directly.

I called it "host-tuple" instead of "host" because it's clearer that it's just the target name. I'm open to different names, but I think this one is fine.

a quick GitHub search for `'^host` reveals many instances of people doing the parsing, for example:

https://github.com/japaric/xargo/blob/68e0ca57cd90837fe02f262f074182f9cfeb6227/README.md?plain=1#L369
https://github.com/taiki-e/setup-cross-toolchain-action/blob/0e38473b0c562d6db19a98d3ec20a80f7ac189ae/main.sh#L96
https://github.com/taiki-e/cargo-llvm-cov/blob/8a3553b86551eabf9c30c060b1f72a5bbccb98c6/README.md?plain=1#L625
https://github.com/SiliconLabs/cpc-nvm3/blob/43f3ec39709b30700ef7f39d91fa647974323bf1/do.sh#L35

needs a compiler FCP. I could also do an MCP but I think just an FCP here makes the most sense.

Author: bors

compiler/rustc_codegen_cranelift/src/global_asm.rs

@@ -118,8 +118,8 @@ impl GlobalAsmConfig {
         GlobalAsmConfig {
             assembler: crate::toolchain::get_toolchain_binary(tcx.sess, "as"),
             target: match &tcx.sess.opts.target_triple {
-                rustc_target::spec::TargetTriple::TargetTriple(triple) => triple.clone(),
-                rustc_target::spec::TargetTriple::TargetJson { path_for_rustdoc, .. } => {
+                rustc_target::spec::TargetTuple::TargetTuple(triple) => triple.clone(),
+                rustc_target::spec::TargetTuple::TargetJson { path_for_rustdoc, .. } => {
                     path_for_rustdoc.to_str().unwrap().to_owned()
                 }
             },

compiler/rustc_codegen_gcc/src/consts.rs

@@ -146,7 +146,7 @@ impl<'gcc, 'tcx> StaticCodegenMethods for CodegenCx<'gcc, 'tcx> {
 
         // Wasm statics with custom link sections get special treatment as they
         // go into custom sections of the wasm executable.
-        if self.tcx.sess.opts.target_triple.triple().starts_with("wasm32") {
+        if self.tcx.sess.opts.target_triple.tuple().starts_with("wasm32") {
             if let Some(_section) = attrs.link_section {
                 unimplemented!();
             }

compiler/rustc_codegen_llvm/src/back/write.rs

@@ -946,7 +946,7 @@ fn create_section_with_flags_asm(section_name: &str, section_flags: &str, data:
 }
 
 fn target_is_apple(cgcx: &CodegenContext<LlvmCodegenBackend>) -> bool {
-    let triple = cgcx.opts.target_triple.triple();
+    let triple = cgcx.opts.target_triple.tuple();
     triple.contains("-ios")
         || triple.contains("-darwin")
         || triple.contains("-tvos")
@@ -955,7 +955,7 @@ fn target_is_apple(cgcx: &CodegenContext<LlvmCodegenBackend>) -> bool {
 }
 
 fn target_is_aix(cgcx: &CodegenContext<LlvmCodegenBackend>) -> bool {
-    cgcx.opts.target_triple.triple().contains("-aix")
+    cgcx.opts.target_triple.tuple().contains("-aix")
 }
 
 pub(crate) fn bitcode_section_name(cgcx: &CodegenContext<LlvmCodegenBackend>) -> &'static CStr {
@@ -1031,7 +1031,7 @@ unsafe fn embed_bitcode(
     let is_aix = target_is_aix(cgcx);
     let is_apple = target_is_apple(cgcx);
     unsafe {
-        if is_apple || is_aix || cgcx.opts.target_triple.triple().starts_with("wasm") {
+        if is_apple || is_aix || cgcx.opts.target_triple.tuple().starts_with("wasm") {
             // We don't need custom section flags, create LLVM globals.
             let llconst = common::bytes_in_context(llcx, bitcode);
             let llglobal = llvm::LLVMAddGlobal(

compiler/rustc_codegen_ssa/src/back/link.rs

@@ -997,7 +997,7 @@ fn link_natively(
                     {
                         let is_vs_installed = windows_registry::find_vs_version().is_ok();
                         let has_linker = windows_registry::find_tool(
-                            sess.opts.target_triple.triple(),
+                            sess.opts.target_triple.tuple(),
                             "link.exe",
                         )
                         .is_some();
@@ -1323,10 +1323,8 @@ fn link_sanitizer_runtime(
         } else {
             let default_sysroot =
                 filesearch::get_or_default_sysroot().expect("Failed finding sysroot");
-            let default_tlib = filesearch::make_target_lib_path(
-                &default_sysroot,
-                sess.opts.target_triple.triple(),
-            );
+            let default_tlib =
+                filesearch::make_target_lib_path(&default_sysroot, sess.opts.target_triple.tuple());
             default_tlib
         }
     }

compiler/rustc_codegen_ssa/src/back/linker.rs

@@ -47,7 +47,7 @@ pub(crate) fn get_linker<'a>(
     self_contained: bool,
     target_cpu: &'a str,
 ) -> Box<dyn Linker + 'a> {
-    let msvc_tool = windows_registry::find_tool(sess.opts.target_triple.triple(), "link.exe");
+    let msvc_tool = windows_registry::find_tool(sess.opts.target_triple.tuple(), "link.exe");
 
     // If our linker looks like a batch script on Windows then to execute this
     // we'll need to spawn `cmd` explicitly. This is primarily done to handle

compiler/rustc_driver_impl/src/lib.rs

@@ -62,7 +62,7 @@ use rustc_session::{EarlyDiagCtxt, Session, config, filesearch};
 use rustc_span::FileName;
 use rustc_span::source_map::FileLoader;
 use rustc_target::json::ToJson;
-use rustc_target::spec::{Target, TargetTriple};
+use rustc_target::spec::{Target, TargetTuple};
 use time::OffsetDateTime;
 use tracing::trace;
 
@@ -731,6 +731,7 @@ fn print_crate_info(
                 targets.sort_unstable();
                 println_info!("{}", targets.join("\n"));
             }
+            HostTuple => println_info!("{}", rustc_session::config::host_tuple()),
             Sysroot => println_info!("{}", sess.sysroot.display()),
             TargetLibdir => println_info!("{}", sess.target_tlib_path.dir.display()),
             TargetSpec => {
@@ -739,7 +740,7 @@ fn print_crate_info(
             AllTargetSpecs => {
                 let mut targets = BTreeMap::new();
                 for name in rustc_target::spec::TARGETS {
-                    let triple = TargetTriple::from_triple(name);
+                    let triple = TargetTuple::from_tuple(name);
                     let target = Target::expect_builtin(&triple);
                     targets.insert(name, target.to_json());
                 }
@@ -918,7 +919,7 @@ pub fn version_at_macro_invocation(
         safe_println!("binary: {binary}");
         safe_println!("commit-hash: {commit_hash}");
         safe_println!("commit-date: {commit_date}");
-        safe_println!("host: {}", config::host_triple());
+        safe_println!("host: {}", config::host_tuple());
         safe_println!("release: {release}");
 
         let debug_flags = matches.opt_strs("Z");
@@ -1495,7 +1496,7 @@ fn report_ice(
     }
 
     let version = util::version_str!().unwrap_or("unknown_version");
-    let triple = config::host_triple();
+    let tuple = config::host_tuple();
 
     static FIRST_PANIC: AtomicBool = AtomicBool::new(true);
 
@@ -1505,7 +1506,7 @@ fn report_ice(
             Ok(mut file) => {
                 dcx.emit_note(session_diagnostics::IcePath { path: path.clone() });
                 if FIRST_PANIC.swap(false, Ordering::SeqCst) {
-                    let _ = write!(file, "\n\nrustc version: {version}\nplatform: {triple}");
+                    let _ = write!(file, "\n\nrustc version: {version}\nplatform: {tuple}");
                 }
                 Some(file)
             }
@@ -1518,12 +1519,12 @@ fn report_ice(
                         .map(PathBuf::from)
                         .map(|env_var| session_diagnostics::IcePathErrorEnv { env_var }),
                 });
-                dcx.emit_note(session_diagnostics::IceVersion { version, triple });
+                dcx.emit_note(session_diagnostics::IceVersion { version, triple: tuple });
                 None
             }
         }
     } else {
-        dcx.emit_note(session_diagnostics::IceVersion { version, triple });
+        dcx.emit_note(session_diagnostics::IceVersion { version, triple: tuple });
         None
     };
 

compiler/rustc_errors/src/diagnostic_impls.rs

@@ -11,7 +11,7 @@ use rustc_macros::Subdiagnostic;
 use rustc_span::Span;
 use rustc_span::edition::Edition;
 use rustc_span::symbol::{Ident, MacroRulesNormalizedIdent, Symbol};
-use rustc_target::spec::{PanicStrategy, SplitDebuginfo, StackProtector, TargetTriple};
+use rustc_target::spec::{PanicStrategy, SplitDebuginfo, StackProtector, TargetTuple};
 use rustc_type_ir::{ClosureKind, FloatTy};
 use {rustc_ast as ast, rustc_hir as hir};
 
@@ -89,7 +89,7 @@ into_diag_arg_using_display!(
     MacroRulesNormalizedIdent,
     ParseIntError,
     StackProtector,
-    &TargetTriple,
+    &TargetTuple,
     SplitDebuginfo,
     ExitStatus,
     ErrCode,

compiler/rustc_hir_typeck/src/lib.rs

@@ -493,7 +493,7 @@ fn fatally_break_rust(tcx: TyCtxt<'_>, span: Span) -> ! {
         "we would appreciate a joke overview: \
          https://github.com/rust-lang/rust/issues/43162#issuecomment-320764675",
     );
-    diag.note(format!("rustc {} running on {}", tcx.sess.cfg_version, config::host_triple(),));
+    diag.note(format!("rustc {} running on {}", tcx.sess.cfg_version, config::host_tuple(),));
     if let Some((flags, excluded_cargo_defaults)) = rustc_session::utils::extra_compiler_flags() {
         diag.note(format!("compiler flags: {}", flags.join(" ")));
         if excluded_cargo_defaults {

compiler/rustc_interface/src/util.rs

@@ -11,7 +11,7 @@ use rustc_data_structures::sync;
 use rustc_metadata::{DylibError, load_symbol_from_dylib};
 use rustc_middle::ty::CurrentGcx;
 use rustc_parse::validate_attr;
-use rustc_session::config::{Cfg, OutFileName, OutputFilenames, OutputTypes, host_triple};
+use rustc_session::config::{Cfg, OutFileName, OutputFilenames, OutputTypes, host_tuple};
 use rustc_session::filesearch::sysroot_candidates;
 use rustc_session::lint::{self, BuiltinLintDiag, LintBuffer};
 use rustc_session::output::{CRATE_TYPES, categorize_crate_type};
@@ -310,7 +310,7 @@ fn get_codegen_sysroot(
         "cannot load the default codegen backend twice"
     );
 
-    let target = host_triple();
+    let target = host_tuple();
     let sysroot_candidates = sysroot_candidates();
 
     let sysroot = iter::once(sysroot)

compiler/rustc_metadata/src/creader.rs

@@ -30,7 +30,7 @@ use rustc_session::search_paths::PathKind;
 use rustc_span::edition::Edition;
 use rustc_span::symbol::{Ident, Symbol, sym};
 use rustc_span::{DUMMY_SP, Span};
-use rustc_target::spec::{PanicStrategy, Target, TargetTriple};
+use rustc_target::spec::{PanicStrategy, Target, TargetTuple};
 use tracing::{debug, info, trace};
 
 use crate::errors;
@@ -506,7 +506,7 @@ impl<'a, 'tcx> CrateLoader<'a, 'tcx> {
         locator.reset();
         locator.is_proc_macro = true;
         locator.target = &self.sess.host;
-        locator.triple = TargetTriple::from_triple(config::host_triple());
+        locator.tuple = TargetTuple::from_tuple(config::host_tuple());
         locator.filesearch = self.sess.host_filesearch(path_kind);
 
         let Some(host_result) = self.load(locator)? else {
@@ -635,7 +635,7 @@ impl<'a, 'tcx> CrateLoader<'a, 'tcx> {
         // FIXME: why is this condition necessary? It was adding in #33625 but I
         // don't know why and the original author doesn't remember ...
         let can_reuse_cratenum =
-            locator.triple == self.sess.opts.target_triple || locator.is_proc_macro;
+            locator.tuple == self.sess.opts.target_triple || locator.is_proc_macro;
         Ok(Some(if can_reuse_cratenum {
             let mut result = LoadResult::Loaded(library);
             for (cnum, data) in self.cstore.iter_crate_data() {