[llvm-branch-commits] [clang] 062adaf - [clang] Reject if constexpr in C (#112685)
Tobias Hieta via llvm-branch-commits
llvm-branch-commits at lists.llvm.org
Tue Oct 29 02:00:12 PDT 2024
Author: Mariya Podchishchaeva
Date: 2024-10-29T09:59:53+01:00
New Revision: 062adaf7d2f101ed9e83c09d192dd228dcbd9ffd
URL: https://github.com/llvm/llvm-project/commit/062adaf7d2f101ed9e83c09d192dd228dcbd9ffd
DIFF: https://github.com/llvm/llvm-project/commit/062adaf7d2f101ed9e83c09d192dd228dcbd9ffd.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 22d38adc28ebe9..3ac1f0fa27f83f 100644
--- a/clang/lib/Parse/ParseStmt.cpp
+++ b/clang/lib/Parse/ParseStmt.cpp
@@ -1508,10 +1508,13 @@ 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 8286cd2107d2f2..a874fd64808404 100644
--- a/clang/test/Sema/constexpr.c
+++ b/clang/test/Sema/constexpr.c
@@ -357,3 +357,10 @@ void infsNaNs() {
constexpr double db5 = LD_SNAN; // expected-error {{constexpr initializer evaluates to nan which is not exactly representable in type 'const double'}}
constexpr double db6 = INF;
}
+
+void constexprif() {
+ if constexpr (300) {} //expected-error {{expected '(' after 'if'}}
+}
+void constevalif() {
+ if consteval (300) {} //expected-error {{expected '(' after 'if'}}
+}
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