[committed] libstdc++: Fix error in filesystem::path with Clang

[Jonathan Wakely via Gcc-patches]

THis fixes teh following error seen with Clang:

error: function '_S_convert<std::basic_string_view<char8_t>>' with deduced
return type cannot be used before it is defined
          return string_type(_S_convert(std::u8string_view(__str)));
                             ^

libstdc++-v3/ChangeLog:

        * include/bits/fs_path.h (path::_S_convert(T)): Avoid recursive
        call to function with deduced return type.

Tested powerpc64le-linux. Committed to trunk.


commit e547d1341b1fe90672c9b982c4a98f8197237bb7
Author: Jonathan Wakely <jwak...@redhat.com>
Date:   Fri Oct 15 23:27:54 2021

    libstdc++: Fix error in filesystem::path with Clang
    
    THis fixes teh following error seen with Clang:
    
    error: function '_S_convert<std::basic_string_view<char8_t>>' with deduced
    return type cannot be used before it is defined
              return string_type(_S_convert(std::u8string_view(__str)));
                                 ^
    
    libstdc++-v3/ChangeLog:
    
            * include/bits/fs_path.h (path::_S_convert(T)): Avoid recursive
            call to function with deduced return type.

diff --git a/libstdc++-v3/include/bits/fs_path.h 
b/libstdc++-v3/include/bits/fs_path.h
index d13fb12455c..4bd980952f1 100644
--- a/libstdc++-v3/include/bits/fs_path.h
+++ b/libstdc++-v3/include/bits/fs_path.h
@@ -630,7 +630,8 @@ namespace __detail
          // Calling _S_convert<char8_t> will return a u8string_view that
          // refers to __str and would dangle after this function returns.
          // Return a string_type instead, to avoid dangling.
-         return string_type(_S_convert(std::u8string_view(__str)));
+         return string_type(_S_convert(__str.data(),
+                                       __str.data() + __str.size()));
 #endif
        else
          return _S_convert(__str.data(), __str.data() + __str.size());