[PATCH] D146376: Update static_assert message for redundant cases

[Krishna Narayanan via Phabricator via cfe-commits]

Krishna-13-cyber updated this revision to Diff 510909.
Krishna-13-cyber added a comment.

- Updated with release note
- I had tried adding more text to the `expected-error` but it already gives a diagnostic of `static assertion failed due to requirement` currently. If I try additions to `{{failed}}` then we get **error diagnostics expected but not seen**.




Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D146376/new/

https://reviews.llvm.org/D146376

Files:
  clang/docs/ReleaseNotes.rst
  clang/lib/Sema/SemaDeclCXX.cpp
  clang/test/SemaCXX/static-assert.cpp


Index: clang/test/SemaCXX/static-assert.cpp
===================================================================
--- clang/test/SemaCXX/static-assert.cpp
+++ clang/test/SemaCXX/static-assert.cpp
@@ -258,8 +258,14 @@
   constexpr bool invert(bool b) {
     return !b;
   }
+
+  static_assert(invert(true) || invert(true), ""); // expected-error {{failed}}
   static_assert(invert(true) == invert(false), ""); // expected-error {{failed}} \
                                                     // expected-note {{evaluates to 'false == true'}}
+  static_assert(true && false, ""); // expected-error {{failed}}
+  static_assert(invert(true) || invert(true) || false, ""); // expected-error {{failed}}
+  static_assert((true && invert(true)) || false, ""); // expected-error {{failed}}
+  static_assert(true && invert(false) && invert(true), ""); // expected-error {{failed}}
 
   /// No notes here since we compare a bool expression with a bool literal.
   static_assert(invert(true) == true, ""); // expected-error {{failed}}
Index: clang/lib/Sema/SemaDeclCXX.cpp
===================================================================
--- clang/lib/Sema/SemaDeclCXX.cpp
+++ clang/lib/Sema/SemaDeclCXX.cpp
@@ -16715,7 +16715,8 @@
 /// Try to print more useful information about a failed static_assert
 /// with expression \E
 void Sema::DiagnoseStaticAssertDetails(const Expr *E) {
-  if (const auto *Op = dyn_cast<BinaryOperator>(E)) {
+  if (const auto *Op = dyn_cast<BinaryOperator>(E);
+      Op && Op->getOpcode() != BO_LOr) {
     const Expr *LHS = Op->getLHS()->IgnoreParenImpCasts();
     const Expr *RHS = Op->getRHS()->IgnoreParenImpCasts();
 
Index: clang/docs/ReleaseNotes.rst
===================================================================
--- clang/docs/ReleaseNotes.rst
+++ clang/docs/ReleaseNotes.rst
@@ -179,6 +179,9 @@
 - Clang now avoids duplicate warnings on unreachable ``[[fallthrough]];`` statements
   previously issued from ``-Wunreachable-code`` and ``-Wunreachable-code-fallthrough``
   by prioritizing ``-Wunreachable-code-fallthrough``.
+- Clang now avoids unnecessary diagnostic warnings for obvious expressions in
+  the case of binary operators with logical OR operations.
+  (`#57906 <https://github.com/llvm/llvm-project/issues/57906>`_)
 
 Bug Fixes in This Version
 -------------------------


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