Author: Mariya Podchishchaeva Date: 2024-10-17T13:42:35+02:00 New Revision: e21c80ac73a9da5c86c20dbce37c9227a17ab06a
URL: https://github.com/llvm/llvm-project/commit/e21c80ac73a9da5c86c20dbce37c9227a17ab06a DIFF: https://github.com/llvm/llvm-project/commit/e21c80ac73a9da5c86c20dbce37c9227a17ab06a.diff LOG: [clang] Reject if constexpr in C (#112685) Fixes https://github.com/llvm/llvm-project/issues/112587 Added: Modified: clang/lib/Parse/ParseStmt.cpp clang/test/Sema/constexpr.c Removed: ################################################################################ diff --git a/clang/lib/Parse/ParseStmt.cpp b/clang/lib/Parse/ParseStmt.cpp index 6480e88316a7d5..60d647da48f053 100644 --- a/clang/lib/Parse/ParseStmt.cpp +++ b/clang/lib/Parse/ParseStmt.cpp @@ -1518,10 +1518,13 @@ StmtResult Parser::ParseIfStatement(SourceLocation *TrailingElseLoc) { SourceLocation ConstevalLoc; if (Tok.is(tok::kw_constexpr)) { - Diag(Tok, getLangOpts().CPlusPlus17 ? diag::warn_cxx14_compat_constexpr_if - : diag::ext_constexpr_if); - IsConstexpr = true; - ConsumeToken(); + // C23 supports constexpr keyword, but only for object definitions. + if (getLangOpts().CPlusPlus) { + Diag(Tok, getLangOpts().CPlusPlus17 ? diag::warn_cxx14_compat_constexpr_if + : diag::ext_constexpr_if); + IsConstexpr = true; + ConsumeToken(); + } } else { if (Tok.is(tok::exclaim)) { NotLocation = ConsumeToken(); diff --git a/clang/test/Sema/constexpr.c b/clang/test/Sema/constexpr.c index 0cf9491c4a42bf..eaa000b3b97758 100644 --- a/clang/test/Sema/constexpr.c +++ b/clang/test/Sema/constexpr.c @@ -367,3 +367,10 @@ struct S10 { constexpr struct S10 c = { 255 }; // FIXME-expected-error@-1 {{constexpr initializer evaluates to 255 which is not exactly representable in 'long long' bit-field with width 8}} // See: GH#101299 + +void constexprif() { + if constexpr (300) {} //expected-error {{expected '(' after 'if'}} +} +void constevalif() { + if consteval (300) {} //expected-error {{expected '(' after 'if'}} +} _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
