[flang-commits] [clang-tools-extra] [libcxx] [llvm] [flang] [clang] [compiler-rt] [libc] [C23] Complete support for WG14 N2508 (PR #71398)
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flang-commits at lists.llvm.org
Mon Nov 6 06:11:20 PST 2023
llvmbot wrote:
<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-openmp
Author: Aaron Ballman (AaronBallman)
<details>
<summary>Changes</summary>
In Clang 16, we implemented the ability to add a label at the end of a compound statement. These changes complete the implementation by allowing a label to be followed by a declaration in C.
Note, this seems to have fixed an issue with some OpenMP stand-alone directives not being properly diagnosed as per:
https://www.openmp.org/spec-html/5.1/openmpsu19.html#x34-330002.1.3
(The same requirement exists in OpenMP 5.2 as well.)
---
Patch is 26.22 KiB, truncated to 20.00 KiB below, full version: https://github.com/llvm/llvm-project/pull/71398.diff
17 Files Affected:
- (modified) clang/docs/ReleaseNotes.rst (+22)
- (modified) clang/include/clang/Basic/DiagnosticParseKinds.td (+6)
- (modified) clang/include/clang/Parse/Parser.h (+3-6)
- (modified) clang/lib/Parse/ParseOpenMP.cpp (+2-2)
- (modified) clang/lib/Parse/ParseStmt.cpp (+21-13)
- (modified) clang/test/C/C2x/n2508.c (+11)
- (modified) clang/test/OpenMP/barrier_ast_print.cpp (+16-8)
- (modified) clang/test/OpenMP/barrier_messages.cpp (+4-4)
- (modified) clang/test/OpenMP/cancel_messages.cpp (+4-2)
- (modified) clang/test/OpenMP/cancellation_point_messages.cpp (+4-2)
- (modified) clang/test/OpenMP/depobj_messages.cpp (+4-4)
- (modified) clang/test/OpenMP/error_message.cpp (+5-5)
- (modified) clang/test/OpenMP/flush_messages.cpp (+4-4)
- (modified) clang/test/OpenMP/scan_messages.cpp (+6-4)
- (modified) clang/test/OpenMP/taskwait_messages.cpp (+4-4)
- (modified) clang/test/OpenMP/taskyield_messages.cpp (+4-4)
- (modified) clang/www/c_status.html (+1-1)
``````````diff
diff --git a/clang/docs/ReleaseNotes.rst b/clang/docs/ReleaseNotes.rst
index 5e19dbea6608486..ae851d754c84831 100644
--- a/clang/docs/ReleaseNotes.rst
+++ b/clang/docs/ReleaseNotes.rst
@@ -209,6 +209,12 @@ C23 Feature Support
- Clang now supports ``<stdckdint.h>`` which defines several macros for performing
checked integer arithmetic. It is also exposed in pre-C23 modes.
+- Completed the implementation of
+ `N2508 <https://www.open-std.org/jtc1/sc22/wg14/www/docs/n2508.pdf>`_. We
+ previously implemented allowing a label at the end of a compound statement,
+ and now we've implemented allowing a label to be followed by a declaration
+ instead of a statement.
+
Non-comprehensive list of changes in this release
-------------------------------------------------
@@ -545,6 +551,22 @@ Bug Fixes in This Version
Fixes (`#67687 <https://github.com/llvm/llvm-project/issues/67687>`_)
- Fix crash from constexpr evaluator evaluating uninitialized arrays as rvalue.
Fixes (`#67317 <https://github.com/llvm/llvm-project/issues/67317>`_)
+- Clang now properly diagnoses use of stand-alone OpenMP directives after a
+ label (including ``case`` or ``default`` labels).
+
+ Before:
+
+ .. code-block:: c++
+
+ label:
+ #pragma omp barrier // ok
+
+ After:
+
+ .. code-block:: c++
+
+ label:
+ #pragma omp barrier // error: '#pragma omp barrier' cannot be an immediate substatement
Bug Fixes to Compiler Builtins
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
diff --git a/clang/include/clang/Basic/DiagnosticParseKinds.td b/clang/include/clang/Basic/DiagnosticParseKinds.td
index de180344fcc5c74..2bc72acc1375143 100644
--- a/clang/include/clang/Basic/DiagnosticParseKinds.td
+++ b/clang/include/clang/Basic/DiagnosticParseKinds.td
@@ -299,6 +299,12 @@ def note_missing_selector_name : Note<
def note_force_empty_selector_name : Note<
"or insert whitespace before ':' to use %0 as parameter name "
"and have an empty entry in the selector">;
+def ext_c_label_followed_by_declaration : ExtWarn<
+ "label followed by a declaration is a C23 extension">,
+ InGroup<C23>;
+def warn_c23_compat_label_followed_by_declaration : Warning<
+ "label followed by a declaration is incompatible with C standards before "
+ "C23">, InGroup<CPre23Compat>, DefaultIgnore;
def ext_c_label_end_of_compound_statement : ExtWarn<
"label at end of compound statement is a C23 extension">,
InGroup<C23>;
diff --git a/clang/include/clang/Parse/Parser.h b/clang/include/clang/Parse/Parser.h
index 30e0352c868637b..22e8c4ceea39cd6 100644
--- a/clang/include/clang/Parse/Parser.h
+++ b/clang/include/clang/Parse/Parser.h
@@ -410,18 +410,15 @@ class Parser : public CodeCompletionHandler {
/// Flags describing a context in which we're parsing a statement.
enum class ParsedStmtContext {
- /// This context permits declarations in language modes where declarations
- /// are not statements.
- AllowDeclarationsInC = 0x1,
/// This context permits standalone OpenMP directives.
- AllowStandaloneOpenMPDirectives = 0x2,
+ AllowStandaloneOpenMPDirectives = 0x1,
/// This context is at the top level of a GNU statement expression.
- InStmtExpr = 0x4,
+ InStmtExpr = 0x2,
/// The context of a regular substatement.
SubStmt = 0,
/// The context of a compound-statement.
- Compound = AllowDeclarationsInC | AllowStandaloneOpenMPDirectives,
+ Compound = AllowStandaloneOpenMPDirectives,
LLVM_MARK_AS_BITMASK_ENUM(InStmtExpr)
};
diff --git a/clang/lib/Parse/ParseOpenMP.cpp b/clang/lib/Parse/ParseOpenMP.cpp
index 3e7d8274aeefc52..9b47ec4fbbc51f1 100644
--- a/clang/lib/Parse/ParseOpenMP.cpp
+++ b/clang/lib/Parse/ParseOpenMP.cpp
@@ -2670,7 +2670,7 @@ StmtResult Parser::ParseOpenMPDeclarativeOrExecutableDirective(
}
case OMPD_threadprivate: {
// FIXME: Should this be permitted in C++?
- if ((StmtCtx & ParsedStmtContext::AllowDeclarationsInC) ==
+ if ((StmtCtx & ParsedStmtContext::AllowStandaloneOpenMPDirectives) ==
ParsedStmtContext()) {
Diag(Tok, diag::err_omp_immediate_directive)
<< getOpenMPDirectiveName(DKind) << 0;
@@ -2689,7 +2689,7 @@ StmtResult Parser::ParseOpenMPDeclarativeOrExecutableDirective(
}
case OMPD_allocate: {
// FIXME: Should this be permitted in C++?
- if ((StmtCtx & ParsedStmtContext::AllowDeclarationsInC) ==
+ if ((StmtCtx & ParsedStmtContext::AllowStandaloneOpenMPDirectives) ==
ParsedStmtContext()) {
Diag(Tok, diag::err_omp_immediate_directive)
<< getOpenMPDirectiveName(DKind) << 0;
diff --git a/clang/lib/Parse/ParseStmt.cpp b/clang/lib/Parse/ParseStmt.cpp
index 2531147c23196ae..da991c641130921 100644
--- a/clang/lib/Parse/ParseStmt.cpp
+++ b/clang/lib/Parse/ParseStmt.cpp
@@ -235,10 +235,7 @@ StmtResult Parser::ParseStatementOrDeclarationAfterAttributes(
auto IsStmtAttr = [](ParsedAttr &Attr) { return Attr.isStmtAttr(); };
bool AllAttrsAreStmtAttrs = llvm::all_of(CXX11Attrs, IsStmtAttr) &&
llvm::all_of(GNUAttrs, IsStmtAttr);
- if ((getLangOpts().CPlusPlus || getLangOpts().MicrosoftExt ||
- (StmtCtx & ParsedStmtContext::AllowDeclarationsInC) !=
- ParsedStmtContext()) &&
- ((GNUAttributeLoc.isValid() && !(HaveAttrs && AllAttrsAreStmtAttrs)) ||
+ if (((GNUAttributeLoc.isValid() && !(HaveAttrs && AllAttrsAreStmtAttrs)) ||
isDeclarationStatement())) {
SourceLocation DeclStart = Tok.getLocation(), DeclEnd;
DeclGroupPtrTy Decl;
@@ -698,6 +695,19 @@ StmtResult Parser::ParseSEHLeaveStatement() {
return Actions.ActOnSEHLeaveStmt(LeaveLoc, getCurScope());
}
+static void DiagnoseLabelFollowedByDecl(Parser &P, const Stmt *SubStmt) {
+ // When in C mode (but not Microsoft extensions mode), diagnose use of a
+ // label that is followed by a declaration rather than a statement.
+ if (!P.getLangOpts().CPlusPlus && !P.getLangOpts().MicrosoftExt &&
+ isa<DeclStmt>(SubStmt)) {
+ if (P.getLangOpts().C23)
+ P.Diag(SubStmt->getBeginLoc(),
+ diag::warn_c23_compat_label_followed_by_declaration);
+ else
+ P.Diag(SubStmt->getBeginLoc(), diag::ext_c_label_followed_by_declaration);
+ }
+}
+
/// ParseLabeledStatement - We have an identifier and a ':' after it.
///
/// label:
@@ -712,9 +722,7 @@ StmtResult Parser::ParseLabeledStatement(ParsedAttributes &Attrs,
assert(Tok.is(tok::identifier) && Tok.getIdentifierInfo() &&
"Not an identifier!");
- // The substatement is always a 'statement', not a 'declaration', but is
- // otherwise in the same context as the labeled-statement.
- StmtCtx &= ~ParsedStmtContext::AllowDeclarationsInC;
+ StmtCtx &= ~ParsedStmtContext::AllowStandaloneOpenMPDirectives;
Token IdentTok = Tok; // Save the whole token.
ConsumeToken(); // eat the identifier.
@@ -763,6 +771,8 @@ StmtResult Parser::ParseLabeledStatement(ParsedAttributes &Attrs,
if (SubStmt.isInvalid())
SubStmt = Actions.ActOnNullStmt(ColonLoc);
+ DiagnoseLabelFollowedByDecl(*this, SubStmt.get());
+
LabelDecl *LD = Actions.LookupOrCreateLabel(IdentTok.getIdentifierInfo(),
IdentTok.getLocation());
Actions.ProcessDeclAttributeList(Actions.CurScope, LD, Attrs);
@@ -781,9 +791,7 @@ StmtResult Parser::ParseCaseStatement(ParsedStmtContext StmtCtx,
bool MissingCase, ExprResult Expr) {
assert((MissingCase || Tok.is(tok::kw_case)) && "Not a case stmt!");
- // The substatement is always a 'statement', not a 'declaration', but is
- // otherwise in the same context as the labeled-statement.
- StmtCtx &= ~ParsedStmtContext::AllowDeclarationsInC;
+ StmtCtx &= ~ParsedStmtContext::AllowStandaloneOpenMPDirectives;
// It is very common for code to contain many case statements recursively
// nested, as in (but usually without indentation):
@@ -909,6 +917,7 @@ StmtResult Parser::ParseCaseStatement(ParsedStmtContext StmtCtx,
// Broken sub-stmt shouldn't prevent forming the case statement properly.
if (SubStmt.isInvalid())
SubStmt = Actions.ActOnNullStmt(SourceLocation());
+ DiagnoseLabelFollowedByDecl(*this, SubStmt.get());
Actions.ActOnCaseStmtBody(DeepestParsedCaseStmt, SubStmt.get());
}
@@ -924,9 +933,7 @@ StmtResult Parser::ParseCaseStatement(ParsedStmtContext StmtCtx,
StmtResult Parser::ParseDefaultStatement(ParsedStmtContext StmtCtx) {
assert(Tok.is(tok::kw_default) && "Not a default stmt!");
- // The substatement is always a 'statement', not a 'declaration', but is
- // otherwise in the same context as the labeled-statement.
- StmtCtx &= ~ParsedStmtContext::AllowDeclarationsInC;
+ StmtCtx &= ~ParsedStmtContext::AllowStandaloneOpenMPDirectives;
SourceLocation DefaultLoc = ConsumeToken(); // eat the 'default'.
@@ -960,6 +967,7 @@ StmtResult Parser::ParseDefaultStatement(ParsedStmtContext StmtCtx) {
if (SubStmt.isInvalid())
SubStmt = Actions.ActOnNullStmt(ColonLoc);
+ DiagnoseLabelFollowedByDecl(*this, SubStmt.get());
return Actions.ActOnDefaultStmt(DefaultLoc, ColonLoc,
SubStmt.get(), getCurScope());
}
diff --git a/clang/test/C/C2x/n2508.c b/clang/test/C/C2x/n2508.c
index 2dee0b668cb4e8c..b47c1274aab965c 100644
--- a/clang/test/C/C2x/n2508.c
+++ b/clang/test/C/C2x/n2508.c
@@ -21,3 +21,14 @@ void test() {
final:
}
+void test_labels() {
+label:
+ int i = 0;
+
+ switch (i) {
+ case 1:
+ _Static_assert(true);
+ default:
+ _Static_assert(true);
+ }
+}
diff --git a/clang/test/OpenMP/barrier_ast_print.cpp b/clang/test/OpenMP/barrier_ast_print.cpp
index a8db2172c19289d..9b7398b3d5b4324 100644
--- a/clang/test/OpenMP/barrier_ast_print.cpp
+++ b/clang/test/OpenMP/barrier_ast_print.cpp
@@ -17,13 +17,13 @@ T tmain(T argc) {
static T a;
#pragma omp barrier
switch (argc) {
- case 0:
+ case 0: {
#pragma omp barrier
- break;
- default:
+ } break;
+ default: {
#pragma omp barrier
#pragma omp barrier
- break;
+ } break;
}
return a + argc;
}
@@ -35,11 +35,15 @@ T tmain(T argc) {
// CHECK-NEXT: #pragma omp barrier
// CHECK-NEXT: switch (argc) {
// CHECK-NEXT: case 0:
+// CHECK-NEXT: {
// CHECK-NEXT: #pragma omp barrier
+// CHECK-NEXT: }
// CHECK-NEXT: break;
// CHECK-NEXT: default:
+// CHECK-NEXT: {
// CHECK-NEXT: #pragma omp barrier
// CHECK-NEXT: #pragma omp barrier
+// CHECK-NEXT: }
// CHECK-NEXT: break;
// CHECK-NEXT: }
@@ -49,21 +53,25 @@ int main(int argc, char **argv) {
#pragma omp barrier
// CHECK-NEXT: #pragma omp barrier
switch (argc) {
- case 0:
+ case 0: {
#pragma omp barrier
#pragma omp barrier
- break;
- default:
+ } break;
+ default: {
#pragma omp barrier
- break;
+ } break;
}
// CHECK-NEXT: switch (argc) {
// CHECK-NEXT: case 0:
+// CHECK-NEXT: {
// CHECK-NEXT: #pragma omp barrier
// CHECK-NEXT: #pragma omp barrier
+// CHECK-NEXT: }
// CHECK-NEXT: break;
// CHECK-NEXT: default:
+// CHECK-NEXT: {
// CHECK-NEXT: #pragma omp barrier
+// CHECK-NEXT: }
// CHECK-NEXT: break;
// CHECK-NEXT: }
return tmain(argc) + tmain(argv[0][0]) + a;
diff --git a/clang/test/OpenMP/barrier_messages.cpp b/clang/test/OpenMP/barrier_messages.cpp
index 589b9c711aaae95..1dda66b9b242592 100644
--- a/clang/test/OpenMP/barrier_messages.cpp
+++ b/clang/test/OpenMP/barrier_messages.cpp
@@ -38,7 +38,7 @@ T tmain(T argc) {
switch (argc) {
#pragma omp barrier
case 1:
-#pragma omp barrier
+#pragma omp barrier // expected-error {{'#pragma omp barrier' cannot be an immediate substatement}}
break;
default: {
#pragma omp barrier
@@ -50,7 +50,7 @@ T tmain(T argc) {
#pragma omp barrier
}
label:
-#pragma omp barrier
+#pragma omp barrier // expected-error {{'#pragma omp barrier' cannot be an immediate substatement}}
label1 : {
#pragma omp barrier
}
@@ -92,7 +92,7 @@ int main(int argc, char **argv) {
switch (argc) {
#pragma omp barrier
case 1:
-#pragma omp barrier
+#pragma omp barrier // expected-error {{'#pragma omp barrier' cannot be an immediate substatement}}
break;
default: {
#pragma omp barrier
@@ -104,7 +104,7 @@ int main(int argc, char **argv) {
#pragma omp barrier
}
label:
-#pragma omp barrier
+#pragma omp barrier // expected-error {{'#pragma omp barrier' cannot be an immediate substatement}}
label1 : {
#pragma omp barrier
}
diff --git a/clang/test/OpenMP/cancel_messages.cpp b/clang/test/OpenMP/cancel_messages.cpp
index fd19f1f373ef9b1..0c96beecc04b04e 100644
--- a/clang/test/OpenMP/cancel_messages.cpp
+++ b/clang/test/OpenMP/cancel_messages.cpp
@@ -71,7 +71,8 @@ int main(int argc, char **argv) {
switch (argc) {
#pragma omp cancel taskgroup // expected-error {{orphaned 'omp cancel' directives are prohibited; perhaps you forget to enclose the directive into a region?}}
case 1:
-#pragma omp cancel parallel // expected-error {{orphaned 'omp cancel' directives are prohibited; perhaps you forget to enclose the directive into a region?}}
+#pragma omp cancel parallel // expected-error {{orphaned 'omp cancel' directives are prohibited; perhaps you forget to enclose the directive into a region?}} \
+ expected-error {{'#pragma omp cancel' cannot be an immediate substatement}}
break;
default: {
#pragma omp cancel sections // expected-error {{orphaned 'omp cancel' directives are prohibited; perhaps you forget to enclose the directive into a region?}}
@@ -83,7 +84,8 @@ int main(int argc, char **argv) {
#pragma omp cancel taskgroup // expected-error {{orphaned 'omp cancel' directives are prohibited; perhaps you forget to enclose the directive into a region?}}
}
label:
-#pragma omp cancel parallel // expected-error {{orphaned 'omp cancel' directives are prohibited; perhaps you forget to enclose the directive into a region?}}
+#pragma omp cancel parallel // expected-error {{orphaned 'omp cancel' directives are prohibited; perhaps you forget to enclose the directive into a region?}} \
+ expected-error {{'#pragma omp cancel' cannot be an immediate substatement}}
label1 : {
#pragma omp cancel sections // expected-error {{orphaned 'omp cancel' directives are prohibited; perhaps you forget to enclose the directive into a region?}}
}
diff --git a/clang/test/OpenMP/cancellation_point_messages.cpp b/clang/test/OpenMP/cancellation_point_messages.cpp
index 268cab2d80a6e40..e928449ff57a980 100644
--- a/clang/test/OpenMP/cancellation_point_messages.cpp
+++ b/clang/test/OpenMP/cancellation_point_messages.cpp
@@ -71,7 +71,8 @@ int main(int argc, char **argv) {
switch (argc) {
#pragma omp cancellation point taskgroup // expected-error {{orphaned 'omp cancellation point' directives are prohibited; perhaps you forget to enclose the directive into a region?}}
case 1:
-#pragma omp cancellation point parallel // expected-error {{orphaned 'omp cancellation point' directives are prohibited; perhaps you forget to enclose the directive into a region?}}
+#pragma omp cancellation point parallel // expected-error {{orphaned 'omp cancellation point' directives are prohibited; perhaps you forget to enclose the directive into a region?}} \
+ expected-error {{'#pragma omp cancellation point' cannot be an immediate substatement}}
break;
default: {
#pragma omp cancellation point sections // expected-error {{orphaned 'omp cancellation point' directives are prohibited; perhaps you forget to enclose the directive into a region?}}
@@ -83,7 +84,8 @@ int main(int argc, char **argv) {
#pragma omp cancellation point taskgroup // expected-error {{orphaned 'omp cancellation point' directives are prohibited; perhaps you forget to enclose the directive into a region?}}
}
label:
-#pragma omp cancellation point parallel // expected-error {{orphaned 'omp cancellation point' directives are prohibited; perhaps you forget to enclose the directive into a region?}}
+#pragma omp cancellation point parallel // expected-error {{orphaned 'omp cancellation point' directives are prohibited; perhaps you forget to enclose the directive into a region?}} \
+ expected-error {{'#pragma omp cancellation point' cannot be an immediate substatement}}
label1 : {
#pragma omp cancellation point sections // expected-error {{orphaned 'omp cancellation point' directives are prohibited; perhaps you forget to enclose the directive into a region?}}
}
diff --git a/clang/test/OpenMP/depobj_messages.cpp b/clang/test/OpenMP/depobj_messages.cpp
index 38617e16cab9c9a..9d750f651d81f39 100644
--- a/clang/test/OpenMP/depobj_messages.cpp
+++ b/clang/test/OpenMP/depobj_messages.cpp
@@ -59,7 +59,7 @@ T tmain(T argc) {
switch (argc) {
#pragma omp depobj(x) depend(in:s)
case 1:
-#pragma omp depobj(x) depend(in:s)
+#pragma omp depobj(x) depend(in:s) // expected-error {{'#pragma omp depobj' cannot be an immediate substatement}}
break;
default: {
#pragma omp depobj(x) depend(in:s)
@@ -71,7 +71,7 @@ T tmain(T argc) {
#pragma omp depobj(x) depend(in:s)
}
label:
-#pragma omp depobj(x) depend(in:s)
+#pragma omp depobj(x) depend(in:s) // expected-error {{'#pragma omp depobj' cannot be an immediate substatement}}
label1 : {
#pragma omp depobj(x) depend(in:s)
}
@@ -124,7 +124,7 @@ omp_depend_t x;
switch (argc) {
#pragma omp depobj(x) depend(in:s)
case 1:
-#pragma omp depobj(x) depend(in:s)
+#pragma omp depobj(x) depend(in:s) // expected-error {{'#pragma omp depobj' cannot be an immediate substatement}}
break;
default: {
#pragma omp depobj(x) depend(in:s)
@@ -136,7 +136,7 @@ omp_depend_t x;
#pragma omp depobj(x) depend(in:s)
}
label:
-#pragma omp depobj(x) depend(in:s)
+#pragma omp depobj(x) depend(in:s) // expected-error {{'#pragma omp depobj' cannot be an immediate substatement}}
label1 : {
#pragma omp depobj(x) depend(in:s)
}
diff --git a/clang/test/OpenMP/error_message.cpp b/clang/test/OpenMP/error_message.cpp
index 40f1db40fb63af2..9796a6443c0100f 100644
--- a/clang/test/OpenMP/error_message.cpp
+++ b/clang/test/OpenMP/error_message.cpp
@@ -32,8 +32,8 @@ T tmain(T argc) {
}
switch (argc) {
#pragma omp error // expected-error {{ERROR}}
- case 1:
-#pragma omp error // expected-error {{ERROR}}
+ case 1: // FIXME: error without 'at execution' is not a stand-alone directive and so this should be accepted.
+#pragma omp error // expected-error {{'#pragma omp error' cannot be an immediate substatement}}
break;
default: {
#pragma omp error // expected-error {{ERROR}}
@@ -45,7 +45,7 @@ T tmain(T argc) {
#pragma omp error // expected-error {{ERROR}}
}
label:
-#pragma omp error // expected-error {{ERROR}}
+#pragma omp error // expected-error {{'#pragma omp error' cannot be an immediate substatement}}
label1 : {
#pragma omp error // expected-error {{ERROR}}
}
@@ -168,7 +168,7 @@ int main(int argc, char **argv) {
// expected-error at +1 {{ERROR}}
#pragma omp error
case 1:
-// expected-error at +1 {{ERROR}}
+// expected-error at +1 {{'#pragma omp error' cannot be an immediate substatement}}
#pragma omp error
break;
default: {
@@ -183,7 +183,7 @@ int main(int argc, char **argv) {
#pragma omp error
}
label:
-// expected-error at +1 {{ERROR}}
+// expected-error at +1 {{'#pragma omp error' cannot be an immediate substatement}}
#pragma omp error
label1 : {
// expected-error at +1 {{ERROR}}
diff --git a/clang/test/OpenMP/flush_messages.cpp b/clang/test/OpenMP/flush_messages.cpp
index 1be0fb8d590adc3..ad4830b5bf94f96 100644
--- a/clang/test/OpenMP/flush_messages.cpp
+++ b/clang/test/OpenMP/flush_messages.cpp
@@ -43,7 +43,7 @@ T tmain(T argc) {
switch (argc) {
#pragma omp flush
case 1:
-#pragma omp flush
+#pragma omp flush // expected-error {{'#pragma omp flush' cannot be an immediate substatement}}
break;
default: {
#pragma omp flush
@@ -55,7 +55,7 @@ T tmain(T argc) {
#pragma omp flush
}
label:
-#pragma omp flush
+#pragma omp flush // expected-error {{'#pragma omp flush' cannot be an immediate substatement}}
label1 : {
#pragma omp flush
}
@@ -107,7 +107,7 @@ int main(int argc, char **argv) {
switch (argc) {
#pragma omp flush
case 1:
-#pragma omp flush
+#pragma omp flush // expected-error {{'#pragma omp flush' cannot be an immediate substatement}}
break;
default: {
#pragma omp flush
@@ -119,7 +119,7 @@ int main(int argc, char **argv) {
#pragma omp flush
}
l...
[truncated]
``````````
</details>
https://github.com/llvm/llvm-project/pull/71398
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