[committed] libstdc++: Fix std::print test case for Windows

[Jonathan Wakely]

Tested x86_64-linux and x86_64-w64-mingw. Pushed to trunk.

-- >8 --

libstdc++-v3/ChangeLog:

        * src/c++23/print.cc (__write_to_terminal) [_WIN32]: If handle
        does not refer to the console then just write to it using normal
        file I/O.
        * testsuite/27_io/print/2.cc (as_printed_to_terminal): Print
        error message on failure.
        (test_utf16_transcoding): Adjust for as_printed_to_terminal
        modifying its argument.
---
 libstdc++-v3/src/c++23/print.cc         | 13 ++++++++++++-
 libstdc++-v3/testsuite/27_io/print/2.cc |  7 ++++++-
 2 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/libstdc++-v3/src/c++23/print.cc b/libstdc++-v3/src/c++23/print.cc
index 2fe7a2e3565..d72ab856017 100644
--- a/libstdc++-v3/src/c++23/print.cc
+++ b/libstdc++-v3/src/c++23/print.cc
@@ -35,7 +35,8 @@
 
 #ifdef _WIN32
 # include <stdio.h>   // _fileno
-# include <io.h>      // _get_osfhandle
+# include <io.h>      // _get_osfhandle, _open_osfhandle, _write
+# include <fcntl.h>   // _O_APPEND
 # include <windows.h> // GetLastError, WriteConsoleW
 #elifdef _GLIBCXX_HAVE_UNISTD_H
 # include <stdio.h>   // fileno
@@ -324,6 +325,16 @@ namespace
     if (!to_valid_utf16(str, wstr))
       ec = std::make_error_code(errc::illegal_byte_sequence);
 
+    // This allows us to test this function with a normal file,
+    // see testsuite/27_io/print/2.cc
+    if (!check_for_console(term))
+      {
+       int fd = _open_osfhandle((intptr_t)term, _O_APPEND);
+       if (_write(fd, wstr.data(), wstr.size() * 2) == -1)
+         ec = {errno, generic_category()};
+       return ec;
+      }
+
     unsigned long nchars = 0;
     WriteConsoleW(term, wstr.data(), wstr.size(), &nchars, nullptr);
     if (nchars != wstr.size())
diff --git a/libstdc++-v3/testsuite/27_io/print/2.cc 
b/libstdc++-v3/testsuite/27_io/print/2.cc
index e101201f109..8aa7888e7bd 100644
--- a/libstdc++-v3/testsuite/27_io/print/2.cc
+++ b/libstdc++-v3/testsuite/27_io/print/2.cc
@@ -39,7 +39,11 @@ as_printed_to_terminal(std::string& s)
 #else
   const auto ec = std::__write_to_terminal(strm, s);
 #endif
-  VERIFY( !ec || ec == std::make_error_code(std::errc::illegal_byte_sequence) 
);
+  if (ec && ec != std::make_error_code(std::errc::illegal_byte_sequence))
+    {
+      std::println("Failed to : {}", ec.message());
+      VERIFY(!ec);
+    }
   std::fclose(strm);
   std::ifstream in(f.path);
   s.assign(std::istreambuf_iterator<char>(in), {});
@@ -114,6 +118,7 @@ test_utf16_transcoding()
   VERIFY( as_printed_to_terminal(s) );
   VERIFY( utf16_from_bytes(s) == s2 );
 
+  s = (const char*)u8"£🇬🇧 €🇪🇺";
   s += " \xa3 10.99 \xee\xdd";
   VERIFY( ! as_printed_to_terminal(s) );
   std::u16string repl = u"\uFFFD";
-- 
2.43.0