[libcxx-commits] [libcxx] [libcxx] don't `#include <cwchar>` if wide chars aren't enabled (PR #99911)

[Ties Stuij via libcxx-commits]

https://github.com/stuij created https://github.com/llvm/llvm-project/pull/99911

Pull request #96032 unconditionall adds the `cwchar` include in the `format` umbrella header. However support for wchar_t can be disabled in the build system (LIBCXX_ENABLE_WIDE_CHARACTERS).

This patch guards against inclusion of `cwchar` in `format` by checking the `_LIBCPP_HAS_NO_WIDE_CHARACTERS` define.

>From b39ab98b04612142bee87235616b211be1d9145b Mon Sep 17 00:00:00 2001
From: Ties Stuij <ties.stuij at arm.com>
Date: Mon, 22 Jul 2024 18:26:55 +0100
Subject: [PATCH] [libcxx] don't `#include <cwchar>` if wide chars aren't
 enabled

Pull request #96032 unconditionall adds the `cwchar` include in the `format`
umbrella header. However support for wchar_t can be disabled in the build
system (LIBCXX_ENABLE_WIDE_CHARACTERS).

This patch guards against inclusion of `cwchar` in `format` by checking the
`_LIBCPP_HAS_NO_WIDE_CHARACTERS` define.
---
 libcxx/include/format | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/libcxx/include/format b/libcxx/include/format
index c3f2b45f0f730..af5391ccea9dc 100644
--- a/libcxx/include/format
+++ b/libcxx/include/format
@@ -237,21 +237,21 @@ namespace std {
 #  include <cstdint>
 #  include <cstdlib>
 #  include <cstring>
-#  include <cwchar>
 #  include <initializer_list>
 #  include <limits>
+#  include <locale>
 #  include <new>
 #  include <optional>
+#  include <queue>
+#  include <stack>
 #  include <stdexcept>
 #  include <string>
 #  include <string_view>
 #  include <tuple>
-#endif
 
-#if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
-#  include <locale>
-#  include <queue>
-#  include <stack>
+#if !defined(_LIBCPP_HAS_NO_WIDE_CHARACTERS)
+#  include <cwchar>
+#endif
 #endif
 
 #endif // _LIBCPP_FORMAT