release/19.x: [clang] Remove __is_layout_compatible from revertible type traits list (#100572)
#100590
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@cor3ntin What do you think about merging this PR to the release branch? |
llvmbot
added
clang
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@llvm/pr-subscribers-clang Author: None (llvmbot) ChangesBackport 3295d37 Requested by: @Endilll Full diff: https://github.com/llvm/llvm-project/pull/100590.diff 1 Files Affected:
diff --git a/clang/lib/Parse/ParseExpr.cpp b/clang/lib/Parse/ParseExpr.cpp
index 0a017ae79de75..e82b565272831 100644
--- a/clang/lib/Parse/ParseExpr.cpp
+++ b/clang/lib/Parse/ParseExpr.cpp
@@ -763,6 +763,9 @@ class CastExpressionIdValidator final : public CorrectionCandidateCallback {
bool Parser::isRevertibleTypeTrait(const IdentifierInfo *II,
tok::TokenKind *Kind) {
if (RevertibleTypeTraits.empty()) {
+// Revertible type trait is a feature for backwards compatibility with older
+// standard libraries that declare their own structs with the same name as
+// the builtins listed below. New builtins should NOT be added to this list.
#define RTT_JOIN(X, Y) X##Y
#define REVERTIBLE_TYPE_TRAIT(Name) \
RevertibleTypeTraits[PP.getIdentifierInfo(#Name)] = RTT_JOIN(tok::kw_, Name)
@@ -790,7 +793,6 @@ bool Parser::isRevertibleTypeTrait(const IdentifierInfo *II,
REVERTIBLE_TYPE_TRAIT(__is_fundamental);
REVERTIBLE_TYPE_TRAIT(__is_integral);
REVERTIBLE_TYPE_TRAIT(__is_interface_class);
- REVERTIBLE_TYPE_TRAIT(__is_layout_compatible);
REVERTIBLE_TYPE_TRAIT(__is_literal);
REVERTIBLE_TYPE_TRAIT(__is_lvalue_expr);
REVERTIBLE_TYPE_TRAIT(__is_lvalue_reference);
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…ist (llvm#100572) `__is_layout_compatible` was added in Clang 19 (llvm#81506), and at that time it wasn't entirely clear whether it should be a revertible type trait or not. We decided to follow the example of other type traits. Since then llvm#95969 happened, and now we know that we don't want new revertible type traits. This patch removes `__is_layout_compatible` from revertible type traits list, and leaves a comment what revertible type traits are, and that new type traits should not be added there. The intention is to also cherry-pick this to 19 branch. (cherry picked from commit 3295d37)
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@Endilll (or anyone else). If you would like to add a note about this fix in the release notes (completely optional). Please reply to this comment with a one or two sentence description of the fix. When you are done, please add the release:note label to this PR. |
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Backport 3295d37
Requested by: @Endilll