Rollup merge of #98214 - petrochenkov:islike, r=compiler-errors

rustc_target: Remove some redundant target properties

`is_like_emscripten` is equivalent to `os == "emscripten"`, so it's removed.
`is_like_fuchsia` is equivalent to `os == "fuchsia"`, so it's removed.
`is_like_osx` also falls into the same category and is equivalent to `vendor == "apple"`, but it's commonly used so I kept it as is for now.

`is_like_(solaris,windows,wasm)` are combinations of different operating systems or architectures (see compiler/rustc_target/src/spec/tests/tests_impl.rs) so they are also kept as is.

I think `is_like_wasm` (and maybe `is_like_osx`) are sufficiently closed sets, so we can remove these fields as well and replace them with methods like `fn is_like_wasm() { arch == "wasm32" || arch == "wasm64" }`.
On other hand, `is_like_solaris` and `is_like_windows` are sufficiently open and I can imagine custom targets introducing other values for `os`.
This is kind of a gray area.

compiler/rustc_codegen_llvm/src/context.rs

@@ -906,7 +906,7 @@ impl<'ll> CodegenCx<'ll, '_> {
             return eh_catch_typeinfo;
         }
         let tcx = self.tcx;
-        assert!(self.sess().target.is_like_emscripten);
+        assert!(self.sess().target.os == "emscripten");
         let eh_catch_typeinfo = match tcx.lang_items().eh_catch_typeinfo() {
             Some(def_id) => self.get_static(def_id),
             _ => {

compiler/rustc_codegen_llvm/src/intrinsic.rs

@@ -441,7 +441,7 @@ fn try_intrinsic<'ll>(
         bx.store(bx.const_i32(0), dest, ret_align);
     } else if wants_msvc_seh(bx.sess()) {
         codegen_msvc_try(bx, try_func, data, catch_func, dest);
-    } else if bx.sess().target.is_like_emscripten {
+    } else if bx.sess().target.os == "emscripten" {
         codegen_emcc_try(bx, try_func, data, catch_func, dest);
     } else {
         codegen_gnu_try(bx, try_func, data, catch_func, dest);

compiler/rustc_codegen_ssa/src/back/link.rs

@@ -2031,7 +2031,7 @@ fn add_order_independent_options(
 
     add_link_script(cmd, sess, tmpdir, crate_type);
 
-    if sess.target.is_like_fuchsia && crate_type == CrateType::Executable {
+    if sess.target.os == "fuchsia" && crate_type == CrateType::Executable {
         let prefix = if sess.opts.debugging_opts.sanitizer.contains(SanitizerSet::ADDRESS) {
             "asan/"
         } else {
@@ -2051,7 +2051,7 @@ fn add_order_independent_options(
         cmd.no_crt_objects();
     }
 
-    if sess.target.is_like_emscripten {
+    if sess.target.os == "emscripten" {
         cmd.arg("-s");
         cmd.arg(if sess.panic_strategy() == PanicStrategy::Abort {
             "DISABLE_EXCEPTION_CATCHING=1"

compiler/rustc_passes/src/weak_lang_items.rs

@@ -17,7 +17,7 @@ pub fn check_crate<'tcx>(tcx: TyCtxt<'tcx>, items: &mut lang_items::LanguageItem
     if items.eh_personality().is_none() {
         items.missing.push(LangItem::EhPersonality);
     }
-    if tcx.sess.target.is_like_emscripten && items.eh_catch_typeinfo().is_none() {
+    if tcx.sess.target.os == "emscripten" && items.eh_catch_typeinfo().is_none() {
         items.missing.push(LangItem::EhCatchTypeinfo);
     }
 

compiler/rustc_target/src/asm/aarch64.rs

@@ -74,7 +74,7 @@ impl AArch64InlineAsmRegClass {
 }
 
 pub fn target_reserves_x18(target: &Target) -> bool {
-    target.os == "android" || target.is_like_fuchsia || target.is_like_osx || target.is_like_windows
+    target.os == "android" || target.os == "fuchsia" || target.is_like_osx || target.is_like_windows
 }
 
 fn reserved_x18(

compiler/rustc_target/src/spec/fuchsia_base.rs

@@ -28,7 +28,6 @@ pub fn opts() -> TargetOptions {
         dynamic_linking: true,
         executables: true,
         families: cvs!["unix"],
-        is_like_fuchsia: true,
         pre_link_args,
         pre_link_objects: crt_objects::new(&[
             (LinkOutputKind::DynamicNoPicExe, &["Scrt1.o"]),

compiler/rustc_target/src/spec/mod.rs

@@ -1273,12 +1273,6 @@ pub struct TargetOptions {
     ///   - uses SEH-based unwinding,
     ///   - supports control flow guard mechanism.
     pub is_like_msvc: bool,
-    /// Whether the target toolchain is like Emscripten's. Only useful for compiling with
-    /// Emscripten toolchain.
-    /// Defaults to false.
-    pub is_like_emscripten: bool,
-    /// Whether the target toolchain is like Fuchsia's.
-    pub is_like_fuchsia: bool,
     /// Whether a target toolchain is like WASM.
     pub is_like_wasm: bool,
     /// Version of DWARF to use if not using the default.
@@ -1505,9 +1499,7 @@ impl Default for TargetOptions {
             is_like_osx: false,
             is_like_solaris: false,
             is_like_windows: false,
-            is_like_emscripten: false,
             is_like_msvc: false,
-            is_like_fuchsia: false,
             is_like_wasm: false,
             dwarf_version: None,
             linker_is_gnu: true,
@@ -2112,8 +2104,6 @@ impl Target {
         key!(is_like_solaris, bool);
         key!(is_like_windows, bool);
         key!(is_like_msvc, bool);
-        key!(is_like_emscripten, bool);
-        key!(is_like_fuchsia, bool);
         key!(is_like_wasm, bool);
         key!(dwarf_version, Option<u32>);
         key!(linker_is_gnu, bool);
@@ -2358,8 +2348,6 @@ impl ToJson for Target {
         target_option_val!(is_like_solaris);
         target_option_val!(is_like_windows);
         target_option_val!(is_like_msvc);
-        target_option_val!(is_like_emscripten);
-        target_option_val!(is_like_fuchsia);
         target_option_val!(is_like_wasm);
         target_option_val!(dwarf_version);
         target_option_val!(linker_is_gnu);

compiler/rustc_target/src/spec/tests/tests_impl.rs

@@ -8,7 +8,12 @@ pub(super) fn test_target(target: Target) {
 
 impl Target {
     fn check_consistency(&self) {
+        assert_eq!(self.is_like_osx, self.vendor == "apple");
+        assert_eq!(self.is_like_solaris, self.os == "solaris" || self.os == "illumos");
+        assert_eq!(self.is_like_windows, self.os == "windows" || self.os == "uefi");
+        assert_eq!(self.is_like_wasm, self.arch == "wasm32" || self.arch == "wasm64");
         assert!(self.is_like_windows || !self.is_like_msvc);
+
         // Check that LLD with the given flavor is treated identically to the linker it emulates.
         // If your target really needs to deviate from the rules below, except it and document the
         // reasons.

compiler/rustc_target/src/spec/wasm32_unknown_emscripten.rs

@@ -26,7 +26,6 @@ pub fn target() -> Target {
         // functionality, and a .wasm file.
         exe_suffix: ".js".into(),
         linker: None,
-        is_like_emscripten: true,
         panic_strategy: PanicStrategy::Unwind,
         no_default_libraries: false,
         post_link_args,