[clang] b012ab0 - [C23] Claim conformance to WG14 N3033
Aaron Ballman via cfe-commits
cfe-commits at lists.llvm.org
Mon Jun 24 07:52:29 PDT 2024
Author: Aaron Ballman
Date: 2024-06-24T10:52:17-04:00
New Revision: b012ab01cb39e440a38dad5d7dd71b419480264b
URL: https://github.com/llvm/llvm-project/commit/b012ab01cb39e440a38dad5d7dd71b419480264b
DIFF: https://github.com/llvm/llvm-project/commit/b012ab01cb39e440a38dad5d7dd71b419480264b.diff
LOG: [C23] Claim conformance to WG14 N3033
Clang has implemented __VA_OPT__ since Clang 12.
Added:
clang/test/C/C2x/n3033.c
clang/test/C/C2x/n3033_2.c
Modified:
clang/www/c_status.html
Removed:
################################################################################
diff --git a/clang/test/C/C2x/n3033.c b/clang/test/C/C2x/n3033.c
new file mode 100644
index 0000000000000..bf249a37facb3
--- /dev/null
+++ b/clang/test/C/C2x/n3033.c
@@ -0,0 +1,50 @@
+// RUN: %clang_cc1 -std=c23 -E %s | FileCheck %s
+
+/* WG14 N3033: Clang 12
+ * Comma ommission and deletion (__VA_OPT__)
+ */
+
+#define F(...) f(0 __VA_OPT__(,) __VA_ARGS__)
+#define G(X, ...) f(0, X __VA_OPT__(,) __VA_ARGS__)
+#define SDEF(sname, ...) S sname __VA_OPT__(= { __VA_ARGS__ })
+#define EMP
+
+F(a, b, c) // replaced by f(0, a, b, c)
+// CHECK: f(0 , a, b, c)
+F() // replaced by f(0)
+// CHECK: f(0 )
+F(EMP) // replaced by f(0)
+// CHECK: f(0 )
+
+G(a, b, c) // replaced by f(0, a, b, c)
+// CHECK: f(0, a , b, c)
+G(a, ) // replaced by f(0, a)
+// CHECK: f(0, a )
+G(a) // replaced by f(0, a)
+// CHECK: f(0, a )
+
+SDEF(foo); // replaced by S foo;
+// CHECK: S foo ;
+SDEF(bar, 1, 2); // replaced by S bar = { 1, 2 };
+// CHECK: S bar = { 1, 2 };
+
+//#define H1(X, ...) X __VA_OPT__(##) __VA_ARGS__ // error: ## may not appear at the beginning of a replacement list (6.10.3.3)
+
+#define H2(X, Y, ...) __VA_OPT__(X ## Y,) __VA_ARGS__
+H2(a, b, c, d) // replaced by ab, c, d
+// CHECK: ab, c, d
+
+#define H3(X, ...) #__VA_OPT__(X##X X##X)
+H3(, 0) // replaced by ""
+// CHECK: ""
+
+#define H4(X, ...) __VA_OPT__(a X ## X) ## b
+H4(, 1) // replaced by a b
+// CHECK: a b
+
+#define H5A(...) __VA_OPT__()/**/__VA_OPT__()
+#define H5B(X) a ## X ## b
+#define H5C(X) H5B(X)
+H5C(H5A()) // replaced by ab
+// CHECK: ab
+
diff --git a/clang/test/C/C2x/n3033_2.c b/clang/test/C/C2x/n3033_2.c
new file mode 100644
index 0000000000000..5da206658690c
--- /dev/null
+++ b/clang/test/C/C2x/n3033_2.c
@@ -0,0 +1,4 @@
+// RUN: %clang_cc1 -fsyntax-only -std=c23 -verify %s
+
+#define H1(X, ...) X __VA_OPT__(##) __VA_ARGS__ // expected-error {{'##' cannot appear at start of __VA_OPT__ argument}}
+
diff --git a/clang/www/c_status.html b/clang/www/c_status.html
index 6b375a6b7999d..f6a92d94874a5 100644
--- a/clang/www/c_status.html
+++ b/clang/www/c_status.html
@@ -1184,7 +1184,7 @@ <h2 id="c2x">C23 implementation status</h2>
<tr>
<td>Comma ommission and deletion (__VA_OPT__)</td>
<td><a href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n3033.htm">N3033</a></td>
- <td class="unknown" align="center">Unknown</td>
+ <td class="full" align="center">Clang 12</td>
</tr>
<tr>
<td>Underspecified object definitions</td>
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