================
@@ -0,0 +1,38 @@
+// RUN: %clang_cc1 -E -pedantic-errors %s -verify -std=c++98
+// RUN: %clang_cc1 -E -pedantic-errors %s -verify -std=c++11
+// RUN: %clang_cc1 -E -pedantic-errors %s -verify -std=c++14
+// RUN: %clang_cc1 -E -pedantic-errors %s -verify -std=c++17
+// RUN: %clang_cc1 -E -pedantic-errors %s -verify -std=c++20
+// RUN: %clang_cc1 -E -pedantic-errors %s -verify -std=c++23
+
+// Test 1: Top-level comma
+// expected-error@+1 {{expected end of line in preprocessor expression}}
+#if 1, 2
+#endif
+
+// Test 2: Comma in conditional expression(CWG3017)
+// Per CWG 3017, this exact case highlights the specification gap
+// where C++ lacks explicit prohibition of comma operators in #if
+// expected-error@+1 {{comma operator in operand of #if}}
+#if 1 ? 1, 0 : 3
+#endif
+
+// Test 3: Parenthesized comma
+// expected-error@+1 {{comma operator in operand of #if}}
+#if (1, 2)
+#endif
+
+// Test 4: Multiple commas
+// expected-error@+1 {{expected end of line in preprocessor expression}}
+#if 1, 2, 3
+#endif
+
+// Test 5: Comma in #elif
+#if 0
+#elif (1, 2) // expected-error {{comma operator in operand of #if}}
+#endif
+
----------------
swote-git wrote:I added test for #embed case. For now, error comes up `expected ')'` , i'm not sure this is right diagnostics. https://github.com/llvm/llvm-project/pull/155570 _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
