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[clang] Reject if constexpr in C #112685

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Merged
merged 1 commit into from
Oct 17, 2024
Merged

[clang] Reject if constexpr in C #112685

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11 changes: 7 additions & 4 deletions clang/lib/Parse/ParseStmt.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -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();
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7 changes: 7 additions & 0 deletions clang/test/Sema/constexpr.c
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Expand Up @@ -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'}}
}
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