[gcc r13-1325] libstdc++: Fix filesystem build for Windows

[Jonathan Wakely <redi@gcc.gnu.org>]

https://gcc.gnu.org/g:bb1f266a7d602ffee4a070f586351bdfafcb6150

commit r13-1325-gbb1f266a7d602ffee4a070f586351bdfafcb6150
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Tue Jun 28 12:56:19 2022 +0100

    libstdc++: Fix filesystem build for Windows
    
    I only half remembered to use char_type instead of char for filesystem
    paths, so that it works with wchar_t on Windows. This fixes the
    bootstrap failure.
    
    libstdc++-v3/ChangeLog:
    
            * src/filesystem/dir-common.h (_Dir_base::_At_path):
            Use char_type consistently for paths.

Diff:
---
 libstdc++-v3/src/filesystem/dir-common.h | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/libstdc++-v3/src/filesystem/dir-common.h b/libstdc++-v3/src/filesystem/dir-common.h
index 4844b1ac453..228fab55afb 100644
--- a/libstdc++-v3/src/filesystem/dir-common.h
+++ b/libstdc++-v3/src/filesystem/dir-common.h
@@ -99,18 +99,22 @@ struct _Dir_base
   struct _At_path
   {
     // No file descriptor given, so interpret the pathname relative to the CWD.
-    _At_path(const char* p) noexcept
+    _At_path(const posix::char_type* p) noexcept
     : pathname(p), dir_fd(fdcwd()), offset(0)
     { }
 
-    _At_path(int fd, const char* p, size_t offset) noexcept
+    _At_path(int fd, const posix::char_type* p, size_t offset) noexcept
     : pathname(p), dir_fd(fd), offset(offset)
     { }
 
-    const char* path() const noexcept { return pathname; }
+    const posix::char_type*
+    path() const noexcept { return pathname; }
 
-    int dir() const noexcept { return dir_fd; }
-    const char* path_at_dir() const noexcept { return pathname + offset; }
+    int
+    dir() const noexcept { return dir_fd; }
+
+    const posix::char_type*
+    path_at_dir() const noexcept { return pathname + offset; }
 
   private:
     const posix::char_type* pathname; // Full path relative to CWD.