[libc-commits] [libc] [libc][stdio] Add fopen_s and bootstrap annex k. (PR #152248)

[Aaron Ballman via libc-commits]

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@@ -0,0 +1,19 @@
+//===-- Definition of macros to be used with Annex K functions ------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_INCLUDE_LLVM_LIBC_MACROS_ANNEX_K_MACROS_H
+#define LLVM_LIBC_INCLUDE_LLVM_LIBC_MACROS_ANNEX_K_MACROS_H
+
+#if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L &&                \
+    defined(__STDC_WANT_LIB_EXT1__) && __STDC_WANT_LIB_EXT1__ == 1
----------------
AaronBallman wrote:

I think there's a deeper question for llvm-libc: what is the policy regarding symbols and language standard versions? Will the symbols only be declared for the standardized range of standards versions? Or will the symbols be declared in all standard versions because the symbol will exist within the binary regardless (we aren't vending a C11-specific version of the library that's different from the C23-specific version, right?).

https://github.com/llvm/llvm-project/pull/152248