[gcc r9-10064] libstdc++: Remove un-implementable noexcept from Filesystem TS operations

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

https://gcc.gnu.org/g:a1667b7a7bdf6070eb6294d0f3126b801201852c

commit r9-10064-ga1667b7a7bdf6070eb6294d0f3126b801201852c
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Fri Feb 4 15:23:31 2022 +0000

    libstdc++: Remove un-implementable noexcept from Filesystem TS operations
    
    LWG 3014 removed these incorrect noexcept specifications from the C++17
    std::filesystem operations. They are also incorrect on the experimental
    TS versions and should be removed from them too.
    
    libstdc++-v3/ChangeLog:
    
            * include/experimental/bits/fs_ops.h (fs::copy_file): Remove
            noexcept.
            (fs::create_directories): Likewise.
            (fs::remove_all): Likewise.
            * src/filesystem/ops.cc (fs::copy_file): Remove noexcept.
            (fs::create_directories): Likewise.
            (fs::remove_all): Likewise.
    
    (cherry picked from commit da72e0fd20f87bb523a81a505c00546d3622e9dd)

Diff:
---
 libstdc++-v3/include/experimental/bits/fs_ops.h | 8 ++++----
 libstdc++-v3/src/filesystem/ops.cc              | 6 +++---
 2 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/libstdc++-v3/include/experimental/bits/fs_ops.h b/libstdc++-v3/include/experimental/bits/fs_ops.h
index c92cb56bd75..e41f023da18 100644
--- a/libstdc++-v3/include/experimental/bits/fs_ops.h
+++ b/libstdc++-v3/include/experimental/bits/fs_ops.h
@@ -74,19 +74,19 @@ inline namespace v1
   { return copy_file(__from, __to, copy_options::none); }
 
   inline bool
-  copy_file(const path& __from, const path& __to, error_code& __ec) noexcept
+  copy_file(const path& __from, const path& __to, error_code& __ec)
   { return copy_file(__from, __to, copy_options::none, __ec); }
 
   bool copy_file(const path& __from, const path& __to, copy_options __option);
   bool copy_file(const path& __from, const path& __to, copy_options __option,
-		 error_code& __ec) noexcept;
+		 error_code& __ec);
 
   void copy_symlink(const path& __existing_symlink, const path& __new_symlink);
   void copy_symlink(const path& __existing_symlink, const path& __new_symlink,
 		    error_code& __ec) noexcept;
 
   bool create_directories(const path& __p);
-  bool create_directories(const path& __p, error_code& __ec) noexcept;
+  bool create_directories(const path& __p, error_code& __ec);
 
   bool create_directory(const path& __p);
   bool create_directory(const path& __p, error_code& __ec) noexcept;
@@ -262,7 +262,7 @@ inline namespace v1
   bool remove(const path& __p, error_code& __ec) noexcept;
 
   uintmax_t remove_all(const path& __p);
-  uintmax_t remove_all(const path& __p, error_code& __ec) noexcept;
+  uintmax_t remove_all(const path& __p, error_code& __ec);
 
   void rename(const path& __from, const path& __to);
   void rename(const path& __from, const path& __to, error_code& __ec) noexcept;
diff --git a/libstdc++-v3/src/filesystem/ops.cc b/libstdc++-v3/src/filesystem/ops.cc
index ea2693622de..d920afeffb0 100644
--- a/libstdc++-v3/src/filesystem/ops.cc
+++ b/libstdc++-v3/src/filesystem/ops.cc
@@ -366,7 +366,7 @@ fs::copy_file(const path& from, const path& to, copy_options option)
 
 bool
 fs::copy_file(const path& from, const path& to, copy_options options,
-	      error_code& ec) noexcept
+	      error_code& ec)
 {
 #ifdef _GLIBCXX_HAVE_SYS_STAT_H
   return do_copy_file(from.c_str(), to.c_str(), copy_file_options(options),
@@ -418,7 +418,7 @@ fs::create_directories(const path& p)
 }
 
 bool
-fs::create_directories(const path& p, error_code& ec) noexcept
+fs::create_directories(const path& p, error_code& ec)
 {
   if (p.empty())
     {
@@ -1092,7 +1092,7 @@ fs::remove_all(const path& p)
 }
 
 std::uintmax_t
-fs::remove_all(const path& p, error_code& ec) noexcept
+fs::remove_all(const path& p, error_code& ec)
 {
   const auto s = symlink_status(p, ec);
   if (!status_known(s))