[gcc r11-7148] libstdc++: Fix build failure for targets without unistd.h

[gcc r11-7148] libstdc++: Fix build failure for targets without unistd.h

[Jonathan Wakely]

https://gcc.gnu.org/g:adeaa43ad3bd8004c2521e1fb3bb0e08be33234b

commit r11-7148-gadeaa43ad3bd8004c2521e1fb3bb0e08be33234b
Author: Vladimir Vishnevsky <vv.os.swe@gmail.com>
Date:   Tue Feb 9 10:25:38 2021 +0000

    libstdc++: Fix build failure for targets without unistd.h
    
    The patch fixes build issues occurring if build parameter
    "--enable-cstdio=stdio_pure" is specified and no unistd.h is
    present in the environment.
    
    libstdc++-v3/ChangeLog:
    
            * include/ext/stdio_sync_filebuf.h: Remove unused <unistd.h>.
            * src/c++17/fs_ops.cc (fs::permissions): Qualify mode_t.

Diff:
---
 libstdc++-v3/include/ext/stdio_sync_filebuf.h | 1 -
 libstdc++-v3/src/c++17/fs_ops.cc              | 2 +-
 2 files changed, 1 insertion(+), 2 deletions(-)

diff --git a/libstdc++-v3/include/ext/stdio_sync_filebuf.h b/libstdc++-v3/include/ext/stdio_sync_filebuf.h
index 178b471957a..90765e55831 100644
--- a/libstdc++-v3/include/ext/stdio_sync_filebuf.h
+++ b/libstdc++-v3/include/ext/stdio_sync_filebuf.h
@@ -32,7 +32,6 @@
 #pragma GCC system_header
 
 #include <streambuf>
-#include <unistd.h>
 #include <cstdio>
 #include <bits/c++io.h>  // For __c_file
 #include <bits/move.h>   // For __exchange
diff --git a/libstdc++-v3/src/c++17/fs_ops.cc b/libstdc++-v3/src/c++17/fs_ops.cc
index 72755c98a5a..04a559ab1d6 100644
--- a/libstdc++-v3/src/c++17/fs_ops.cc
+++ b/libstdc++-v3/src/c++17/fs_ops.cc
@@ -1130,7 +1130,7 @@ fs::permissions(const path& p, perms prms, perm_options opts,
 #else
   if (nofollow && is_symlink(st))
     ec = std::make_error_code(std::errc::not_supported);
-  else if (posix::chmod(p.c_str(), static_cast<mode_t>(prms)))
+  else if (posix::chmod(p.c_str(), static_cast<posix::mode_t>(prms)))
     err = errno;
 #endif