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From: "mpie@msc-ge.com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/105422] New: filesystem::copy does not throw
 exceptions when a subdirectory exists
Date: Thu, 28 Apr 2022 13:26:36 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D105422

            Bug ID: 105422
           Summary: filesystem::copy does not throw exceptions when a
                    subdirectory exists
           Product: gcc
           Version: 11.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: mpie@msc-ge.com
  Target Milestone: ---

Created attachment 52895
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D52895&action=3Dedit
Example file to reproduce behaviour

Hi,

in Ubuntu 21.10 a recursive filesystem::copy() does correctly throw an
exception if a file can't be read. But it will not throw an exception if th=
ere
is an empty subdirectory. The destination will therefore miss a file withou=
t a
report. Also the error code will be empty.

See the output of the attached copy_bug.cpp

$ c++ copy_bug.cpp -o copy_bug --std=3Dc++17
$ ./copy_bug

Copytest with withSubDir=3D0
Exception: filesystem error: cannot copy: Permission denied [test/source]
[test/dest]
Error code: Permission denied
Copytest with withSubDir=3D1

$ tree -p test=20=20=20=20=20=20=20
test
=E2=94=9C=E2=94=80=E2=94=80 [drwxrwxr-x]  dest
=E2=94=82=C2=A0=C2=A0 =E2=94=94=E2=94=80=E2=94=80 [drwxrwxr-x]  subdir
=E2=94=9C=E2=94=80=E2=94=80 [drwxrwxr-x]  dest_ec
=E2=94=82=C2=A0=C2=A0 =E2=94=94=E2=94=80=E2=94=80 [drwxrwxr-x]  subdir
=E2=94=94=E2=94=80=E2=94=80 [drwxrwxr-x]  source
    =E2=94=9C=E2=94=80=E2=94=80 [drwxrwxr-x]  subdir
    =E2=94=94=E2=94=80=E2=94=80 [----------]  test.txt=