[PATCH 3/8] libstdc++: Fix std::print for Cygwin

[Jonathan Wakely <jwakely@redhat.com>]

Tested x86_64-linux. I am unable to test this on Cygwin myself. Testing
and reviews invited.

-- >8 --

Cygwin should use std::fwrite, not WriteConsoleW. And the -lstdc++exp
library is only needed when running the tests on *-*-mingw*.

libstdc++-v3/ChangeLog:

	* include/std/ostream (vprint_unicode) [__CYGWIN__]: Use POSIX
	code path for Cygwin instead of Windows.
	* include/std/print (vprint_unicode) [__CYGWIN__]: Likewise.
	* testsuite/27_io/basic_ostream/print/1.cc: Only add -lstdc++exp
	for *-*-mingw* targets.
	* testsuite/27_io/print/1.cc: Likewise.
---
 libstdc++-v3/include/std/ostream                      | 4 ++--
 libstdc++-v3/include/std/print                        | 2 +-
 libstdc++-v3/testsuite/27_io/basic_ostream/print/1.cc | 2 +-
 libstdc++-v3/testsuite/27_io/print/1.cc               | 2 +-
 4 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/libstdc++-v3/include/std/ostream b/libstdc++-v3/include/std/ostream
index 7d501d67489..a136399ad0b 100644
--- a/libstdc++-v3/include/std/ostream
+++ b/libstdc++-v3/include/std/ostream
@@ -906,7 +906,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
   inline void
   vprint_unicode(ostream& __os, string_view __fmt, format_args __args)
   {
-#ifndef _WIN32
+#if !defined(_WIN32) || defined(__CYGWIN__)
     // For most targets we don't need to do anything special to write
     // Unicode to a terminal.
     std::vprint_nonunicode(__os, __fmt, __args);
@@ -923,7 +923,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 	// If stream refers to a terminal, write a Unicode string to it.
 	if (auto __term = __open_terminal(__os.rdbuf()))
 	  {
-#ifndef _WIN32
+#if !defined(_WIN32) || defined(__CYGWIN__)
 	    // For POSIX, __open_terminal(streambuf*) uses fdopen to open a
 	    // new file, so we would need to close it here. This code is not
 	    // actually compiled because it's inside an #ifdef _WIN32 group,
diff --git a/libstdc++-v3/include/std/print b/libstdc++-v3/include/std/print
index 492f333dfa6..d44033469de 100644
--- a/libstdc++-v3/include/std/print
+++ b/libstdc++-v3/include/std/print
@@ -64,7 +64,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
   inline void
   vprint_unicode(FILE* __stream, string_view __fmt, format_args __args)
   {
-#ifndef _WIN32
+#if !defined(_WIN32) || defined(__CYGWIN__)
     // For most targets we don't need to do anything special to write
     // Unicode to a terminal.
     std::vprint_nonunicode(__stream, __fmt, __args);
diff --git a/libstdc++-v3/testsuite/27_io/basic_ostream/print/1.cc b/libstdc++-v3/testsuite/27_io/basic_ostream/print/1.cc
index b3abc570d1e..71a4daa04c9 100644
--- a/libstdc++-v3/testsuite/27_io/basic_ostream/print/1.cc
+++ b/libstdc++-v3/testsuite/27_io/basic_ostream/print/1.cc
@@ -1,4 +1,4 @@
-// { dg-options "-lstdc++exp" }
+// { dg-additional-options "-lstdc++exp" { target { *-*-mingw* } } }
 // { dg-do run { target c++23 } }
 // { dg-require-fileio "" }
 
diff --git a/libstdc++-v3/testsuite/27_io/print/1.cc b/libstdc++-v3/testsuite/27_io/print/1.cc
index 3cfdac1bb74..6a294e0454b 100644
--- a/libstdc++-v3/testsuite/27_io/print/1.cc
+++ b/libstdc++-v3/testsuite/27_io/print/1.cc
@@ -1,4 +1,4 @@
-// { dg-options "-lstdc++exp" }
+// { dg-additional-options "-lstdc++exp" { target { *-*-mingw* } } }
 // { dg-do run { target c++23 } }
 // { dg-require-fileio "" }
 
-- 
2.43.0