[PATCH] libstdc++: Enable std::text_encoding for darwin and FreeBSD

[Jonathan Wakely <jwakely@redhat.com>]

This should fix the std/text_encoding/* FAILs that Iain sees on darwin.
I assume it will make it work for FreeBSD too.
 
I won't push this until I hear it works for at least one of those.

Tested x86_64-linux.

-- >8 --

The <xlocale.h> header is needed for newlocale and locale_t on these
targets.

libstdc++-v3/ChangeLog:

	* acinclude.m4 (GLIBCXX_CHECK_TEXT_ENCODING): Use <xlocale.h> if
	needed for newlocale.
	* configure: Regenerate.
	* src/c++26/text_encoding.cc: Use <xlocale.h>.
---
 libstdc++-v3/acinclude.m4               | 3 +++
 libstdc++-v3/configure                  | 3 +++
 libstdc++-v3/src/c++26/text_encoding.cc | 3 +++
 3 files changed, 9 insertions(+)

diff --git a/libstdc++-v3/acinclude.m4 b/libstdc++-v3/acinclude.m4
index f9ba7ef744b..f72bd0f45b8 100644
--- a/libstdc++-v3/acinclude.m4
+++ b/libstdc++-v3/acinclude.m4
@@ -5834,6 +5834,9 @@ AC_LANG_SAVE
   AC_MSG_CHECKING([whether nl_langinfo_l is defined in <langinfo.h>])
   AC_TRY_COMPILE([
   #include <locale.h>
+  #if __has_include(<xlocale.h>)
+  # include <xlocale.h>
+  #endif
   #include <langinfo.h>
   ],[
     locale_t loc = newlocale(LC_ALL_MASK, "", (locale_t)0);
diff --git a/libstdc++-v3/configure b/libstdc++-v3/configure
index 65ce679f1bd..f4bc0486768 100755
--- a/libstdc++-v3/configure
+++ b/libstdc++-v3/configure
@@ -54533,6 +54533,9 @@ $as_echo_n "checking whether nl_langinfo_l is defined in <langinfo.h>... " >&6;
 /* end confdefs.h.  */
 
   #include <locale.h>
+  #if __has_include(<xlocale.h>)
+  # include <xlocale.h>
+  #endif
   #include <langinfo.h>
 
 int
diff --git a/libstdc++-v3/src/c++26/text_encoding.cc b/libstdc++-v3/src/c++26/text_encoding.cc
index 33c6c07820c..b9a50ef1a00 100644
--- a/libstdc++-v3/src/c++26/text_encoding.cc
+++ b/libstdc++-v3/src/c++26/text_encoding.cc
@@ -27,6 +27,9 @@
 
 #ifdef _GLIBCXX_USE_NL_LANGINFO_L
 #include <locale.h>
+#if __has_include(<xlocale.h>)
+# include <xlocale.h>
+#endif
 #include <langinfo.h>
 
 #if __CHAR_BIT__ == 8
-- 
2.43.0