From b02923592a55b52d796656c5b4f34a964a2604a9 Mon Sep 17 00:00:00 2001
From: Jonathan Wakely <jwakely@redhat.com>
Date: Mon, 21 May 2018 18:18:35 +0100
Subject: Add support for opening file streams from wide character strings

C++17 added new overloads to <fstream> class templates to support
opening files from wide character strings "on systems where
filesystem::path::value_type is not char". This patch adds those
overloads conditional on _wfopen being available, and enables them for
pre-C++17 modes as well.

	Add support for opening file streams from wide character strings.
	* config/io/basic_file_stdio.cc [_GLIBCXX_HAVE__WFOPEN]
	(__basic_file<char>::open(const wchar_t*, ios_base::openmode)):
	Define new overload.
	* config/io/basic_file_stdio.h [_GLIBCXX_HAVE__WFOPEN]
	(__basic_file<char>::open(const wchar_t*, ios_base::openmode)):
	Declare new overload.
	* configure.ac: Check for _wfopen.
	* crossconfig.m4: Likewise.
	* configure: Regenerate.
	* config.h.in: Regenerate.
	* include/bits/fstream.tcc [_GLIBCXX_HAVE__WFOPEN]
	(basic_filebuf<C,T>::open(const wchar_t*, ios_base::openmode)):
	Define new overload.
	* include/std/fstream [_GLIBCXX_HAVE__WFOPEN]
	(basic_filebuf<C,T>::open(const wchar_t*, ios_base::openmode)):
	Declare new overload.
	[_GLIBCXX_HAVE__WFOPEN]
	(basic_ifstream<C,T>::basic_ifstream(const wchar_t*, openmode))
	(basic_ifstream<C,T>::basic_open(const wchar_t*, openmode))
	(basic_ofstream<C,T>::basic_ifstream(const wchar_t*, openmode))
	(basic_ofstream<C,T>::basic_open(const wchar_t*, openmode))
	(basic_fstream<C,T>::basic_ifstream(const wchar_t*, openmode))
	(basic_fstream<C,T>::basic_open(const wchar_t*, openmode)): Define
	new overloads.
	* testsuite/27_io/basic_filebuf/open/wchar_t/1.cc: New.
	* testsuite/27_io/basic_ifstream/cons/wchar_t/1.cc: New.
	* testsuite/27_io/basic_ifstream/open/wchar_t/1.cc: New.
	* testsuite/27_io/basic_ofstream/cons/wchar_t/1.cc: New.
	* testsuite/27_io/basic_ofstream/open/wchar_t/1.cc: New.
	* testsuite/27_io/basic_fstream/cons/wchar_t/1.cc: New.
	* testsuite/27_io/basic_fstream/open/wchar_t/1.cc: New.

From-SVN: r260479
---
 libstdc++-v3/configure | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

(limited to 'libstdc++-v3/configure')

diff --git a/libstdc++-v3/configure b/libstdc++-v3/configure
index c9dbaa1..f3522ee 100755
--- a/libstdc++-v3/configure
+++ b/libstdc++-v3/configure
@@ -28130,6 +28130,17 @@ _ACEOF
 fi
 done
 
+  for ac_func in _wfopen
+do :
+  ac_fn_c_check_func "$LINENO" "_wfopen" "ac_cv_func__wfopen"
+if test "x$ac_cv_func__wfopen" = x""yes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE__WFOPEN 1
+_ACEOF
+
+fi
+done
+
 
   # For iconv support.
 
@@ -66125,6 +66136,17 @@ _ACEOF
 fi
 done
 
+    for ac_func in _wfopen
+do :
+  ac_fn_c_check_func "$LINENO" "_wfopen" "ac_cv_func__wfopen"
+if test "x$ac_cv_func__wfopen" = x""yes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE__WFOPEN 1
+_ACEOF
+
+fi
+done
+
     ;;
   *-netbsd*)
     SECTION_FLAGS='-ffunction-sections -fdata-sections'
-- 
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