[llvm-bugs] [Bug 50734] New: [libc++] Merge 52e9d80d5db20f23979e409f958736d130387f9e into 12.0.1

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=50734

            Bug ID: 50734
           Summary: [libc++] Merge
                    52e9d80d5db20f23979e409f958736d130387f9e into 12.0.1
           Product: libc++
           Version: 12.0
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: All Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: dimitry at andric.com
                CC: llvm-bugs at lists.llvm.org, mclow.lists at gmail.com

Please merge
https://github.com/llvm/llvm-project/commit/52e9d80d5db20f23979e409f958736d130387f9e
into 12.0.1.

This enables libc++'s <fstream> to be used with gcc, which will otherwise
complain with "function body not available" (which is, admittedly, a rather
obscure error):

In file included from
/workspace/src/contrib/llvm-project/libcxx/src/filesystem/operations.cpp:39:
/workspace/src/contrib/llvm-project/libcxx/include/fstream: In function 'bool
std::__1::__fs::filesystem::detail::{anonymous}::copy_file_impl(std::__1::__fs::filesystem::detail::{anonymous}::FileDescriptor&,
std::__1::__fs::filesystem::detail::{anonymous}::FileDescriptor&,
std::__1::error_code&)':
/workspace/src/contrib/llvm-project/libcxx/include/fstream:1329:6: error:
inlining failed in call to always_inline 'void std::__1::basic_ifstream<_CharT,
_Traits>::__open(int, std::__1::ios_base::openmode) [with _CharT = char;
_Traits = std::__1::char_traits<char>]': function body not available
 1329 | void basic_ifstream<_CharT, _Traits>::__open(int __fd,
      |      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/workspace/src/contrib/llvm-project/libcxx/src/filesystem/operations.cpp:778:14:
note: called from here
  778 |     in.__open(read_fd.fd, ios::binary);
      |     ~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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