[libc++] Add an option to disable wide character support in libc++
Some embedded platforms do not wish to support the C library functionality
for handling wchar_t because they have no use for it. It makes sense for
libc++ to work properly on those platforms, so this commit adds a carve-out
of functionality for wchar_t.
Unfortunately, unlike some other carve-outs (e.g. random device), this
patch touches several parts of the library. However, despite the wide
impact of this patch, I still think it is important to support this
configuration since it makes it much simpler to port libc++ to some
embedded platforms.
Differential Revision: https://reviews.llvm.org/D111265
NOKEYCHECK=True
GitOrigin-RevId: f4c1258d5633fcf06385ff3fd1f4bf57ab971964
diff --git a/include/experimental/regex b/include/experimental/regex
index 17193cf..dcd45ac 100644
--- a/include/experimental/regex
+++ b/include/experimental/regex
@@ -52,9 +52,11 @@
polymorphic_allocator<_VSTD::sub_match<_BiDirIter>>>;
typedef match_results<const char*> cmatch;
-typedef match_results<const wchar_t*> wcmatch;
typedef match_results<_VSTD_LFTS_PMR::string::const_iterator> smatch;
+#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
+typedef match_results<const wchar_t*> wcmatch;
typedef match_results<_VSTD_LFTS_PMR::wstring::const_iterator> wsmatch;
+#endif
_LIBCPP_END_NAMESPACE_LFTS_PMR