Rollup of 5 pull requests

Cargo.lock

@@ -771,7 +771,7 @@ dependencies = [
  "tracing-subscriber",
  "unified-diff",
  "walkdir",
- "windows",
+ "windows 0.52.0",
 ]
 
 [[package]]
@@ -1713,7 +1713,7 @@ dependencies = [
  "iana-time-zone-haiku",
  "js-sys",
  "wasm-bindgen",
- "windows-core",
+ "windows-core 0.52.0",
 ]
 
 [[package]]
@@ -2436,15 +2436,6 @@ dependencies = [
  "windows-sys 0.52.0",
 ]
 
-[[package]]
-name = "ntapi"
-version = "0.4.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e8a3895c6391c39d7fe7ebc444a87eb2991b2a0bc718fdabd071eec617fc68e4"
-dependencies = [
- "winapi",
-]
-
 [[package]]
 name = "nu-ansi-term"
 version = "0.46.0"
@@ -3717,7 +3708,7 @@ dependencies = [
  "thorin-dwp",
  "tracing",
  "wasm-encoder 0.210.0",
- "windows",
+ "windows 0.52.0",
 ]
 
 [[package]]
@@ -3774,7 +3765,7 @@ dependencies = [
  "tempfile",
  "thin-vec",
  "tracing",
- "windows",
+ "windows 0.52.0",
 ]
 
 [[package]]
@@ -3835,7 +3826,7 @@ dependencies = [
  "shlex",
  "time",
  "tracing",
- "windows",
+ "windows 0.52.0",
 ]
 
 [[package]]
@@ -3886,7 +3877,7 @@ dependencies = [
  "termcolor",
  "termize",
  "tracing",
- "windows",
+ "windows 0.52.0",
 ]
 
 [[package]]
@@ -4607,7 +4598,7 @@ dependencies = [
  "smallvec",
  "termize",
  "tracing",
- "windows",
+ "windows 0.52.0",
 ]
 
 [[package]]
@@ -5365,16 +5356,13 @@ dependencies = [
 
 [[package]]
 name = "sysinfo"
-version = "0.30.12"
+version = "0.31.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "732ffa00f53e6b2af46208fba5718d9662a421049204e156328b66791ffa15ae"
+checksum = "d4115055da5f572fff541dd0c4e61b0262977f453cc9fe04be83aba25a89bdab"
 dependencies = [
- "cfg-if",
  "core-foundation-sys",
  "libc",
- "ntapi",
- "once_cell",
- "windows",
+ "windows 0.57.0",
 ]
 
 [[package]]
@@ -6299,7 +6287,17 @@ version = "0.52.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e48a53791691ab099e5e2ad123536d0fff50652600abaf43bbf952894110d0be"
 dependencies = [
- "windows-core",
+ "windows-core 0.52.0",
+ "windows-targets 0.52.5",
+]
+
+[[package]]
+name = "windows"
+version = "0.57.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "12342cb4d8e3b046f3d80effd474a7a02447231330ef77d71daa6fbc40681143"
+dependencies = [
+ "windows-core 0.57.0",
  "windows-targets 0.52.5",
 ]
 
@@ -6326,12 +6324,55 @@ dependencies = [
  "windows-targets 0.52.5",
 ]
 
+[[package]]
+name = "windows-core"
+version = "0.57.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d2ed2439a290666cd67ecce2b0ffaad89c2a56b976b736e6ece670297897832d"
+dependencies = [
+ "windows-implement",
+ "windows-interface",
+ "windows-result",
+ "windows-targets 0.52.5",
+]
+
+[[package]]
+name = "windows-implement"
+version = "0.57.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9107ddc059d5b6fbfbffdfa7a7fe3e22a226def0b2608f72e9d552763d3e1ad7"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.67",
+]
+
+[[package]]
+name = "windows-interface"
+version = "0.57.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "29bee4b38ea3cde66011baa44dba677c432a78593e202392d1e9070cf2a7fca7"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.67",
+]
+
 [[package]]
 name = "windows-metadata"
 version = "0.58.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2e837f3c3012cfe9e7086302a93f441a7999439be1ad4c530d55d2f6d2921809"
 
+[[package]]
+name = "windows-result"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5e383302e8ec8515204254685643de10811af0ed97ea37210dc26fb0032647f8"
+dependencies = [
+ "windows-targets 0.52.5",
+]
+
 [[package]]
 name = "windows-sys"
 version = "0.48.0"

compiler/rustc_codegen_llvm/src/declare.rs

@@ -83,20 +83,16 @@ impl<'ll, 'tcx> CodegenCx<'ll, 'tcx> {
         unnamed: llvm::UnnamedAddr,
         fn_type: &'ll Type,
     ) -> &'ll Value {
-        // Declare C ABI functions with the visibility used by C by default.
-        let visibility = if self.tcx.sess.default_hidden_visibility() {
-            llvm::Visibility::Hidden
-        } else {
-            llvm::Visibility::Default
-        };
-
-        declare_raw_fn(self, name, llvm::CCallConv, unnamed, visibility, fn_type)
+        // Declare C ABI functions with Default visibility to allow them to link
+        // dynamically with shared object-provided symbols later on. This is
+        // needed to link intrinsic-generated calls to e.g. libc.so symbols like
+        // memcmp.
+        declare_raw_fn(self, name, llvm::CCallConv, unnamed, llvm::Visibility::Default, fn_type)
     }
 
     /// Declare an entry Function
     ///
-    /// The ABI of this function can change depending on the target (although for now the same as
-    /// `declare_cfn`)
+    /// The ABI of this function can change depending on the target.
     ///
     /// If there’s a value with the same name already declared, the function will
     /// update the declaration and return existing Value instead.

compiler/rustc_errors/src/emitter.rs

@@ -1767,7 +1767,10 @@ impl HumanEmitter {
         debug!(?suggestions);
 
         if suggestions.is_empty() {
-            // Suggestions coming from macros can have malformed spans. This is a heavy handed
+            // Here we check if there are suggestions that have actual code changes. We sometimes
+            // suggest the same code that is already there, instead of changing how we produce the
+            // suggestions and filtering there, we just don't emit the suggestion.
+            // Suggestions coming from macros can also have malformed spans. This is a heavy handed
             // approach to avoid ICEs by ignoring the suggestion outright.
             return Ok(());
         }
@@ -2046,7 +2049,9 @@ impl HumanEmitter {
                     assert!(underline_start >= 0 && underline_end >= 0);
                     let padding: usize = max_line_num_len + 3;
                     for p in underline_start..underline_end {
-                        if let DisplaySuggestion::Underline = show_code_change {
+                        if let DisplaySuggestion::Underline = show_code_change
+                            && is_different(sm, &part.snippet, part.span)
+                        {
                             // If this is a replacement, underline with `~`, if this is an addition
                             // underline with `+`.
                             buffer.putc(
@@ -2824,6 +2829,18 @@ impl Style {
     }
 }
 
+/// Whether the original and suggested code are the same.
+pub fn is_different(sm: &SourceMap, suggested: &str, sp: Span) -> bool {
+    let found = match sm.span_to_snippet(sp) {
+        Ok(snippet) => snippet,
+        Err(e) => {
+            warn!(error = ?e, "Invalid span {:?}", sp);
+            return true;
+        }
+    };
+    found != suggested
+}
+
 /// Whether the original and suggested code are visually similar enough to warrant extra wording.
 pub fn is_case_difference(sm: &SourceMap, suggested: &str, sp: Span) -> bool {
     // FIXME: this should probably be extended to also account for `FO0` → `FOO` and unicode.

compiler/rustc_errors/src/lib.rs

@@ -50,7 +50,7 @@ pub use diagnostic_impls::{
     IndicateAnonymousLifetime, SingleLabelManySpans,
 };
 pub use emitter::ColorConfig;
-use emitter::{is_case_difference, DynEmitter, Emitter};
+use emitter::{is_case_difference, is_different, DynEmitter, Emitter};
 use registry::Registry;
 use rustc_data_structures::fx::{FxHashSet, FxIndexMap, FxIndexSet};
 use rustc_data_structures::stable_hasher::{Hash128, StableHasher};
@@ -357,10 +357,16 @@ impl CodeSuggestion {
                             _ => 1,
                         })
                         .sum();
-                    line_highlight.push(SubstitutionHighlight {
-                        start: (cur_lo.col.0 as isize + acc) as usize,
-                        end: (cur_lo.col.0 as isize + acc + len) as usize,
-                    });
+                    if !is_different(sm, &part.snippet, part.span) {
+                        // Account for cases where we are suggesting the same code that's already
+                        // there. This shouldn't happen often, but in some cases for multipart
+                        // suggestions it's much easier to handle it here than in the origin.
+                    } else {
+                        line_highlight.push(SubstitutionHighlight {
+                            start: (cur_lo.col.0 as isize + acc) as usize,
+                            end: (cur_lo.col.0 as isize + acc + len) as usize,
+                        });
+                    }
                     buf.push_str(&part.snippet);
                     let cur_hi = sm.lookup_char_pos(part.span.hi());
                     // Account for the difference between the width of the current code and the
@@ -392,7 +398,11 @@ impl CodeSuggestion {
                 while buf.ends_with('\n') {
                     buf.pop();
                 }
-                Some((buf, substitution.parts, highlights, only_capitalization))
+                if highlights.iter().all(|parts| parts.is_empty()) {
+                    None
+                } else {
+                    Some((buf, substitution.parts, highlights, only_capitalization))
+                }
             })
             .collect()
     }