[bug #65947] error: unknown type name 'This'

[Ryan Carsten Schmidt]

URL:
  <https://savannah.nongnu.org/bugs/?65947>

                 Summary: error: unknown type name 'This'
                   Group: Simulavr: an AVR simulator
               Submitter: ryandesign
               Submitted: Wed 03 Jul 2024 09:48:56 PM UTC
                Category: None
                Severity: 3 - Normal
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: None
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
       Component Version: simulavr


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Follow-up Comments:


-------------------------------------------------------
Date: Wed 03 Jul 2024 09:48:56 PM UTC By: Ryan Carsten Schmidt <ryandesign>
1.1.0 fails to build with C++20-capable versions of clang on case-insensitive
filesystems (as are typical on macOS):


In file included from
/opt/local/var/macports/build/_Volumes_Shared_macports-ports_emulators_simulavr/simulavr/work/simulavr-release-1.1.0/libsim/atmega128.cpp:26:
In file included from
/opt/local/var/macports/build/_Volumes_Shared_macports-ports_emulators_simulavr/simulavr/work/simulavr-release-1.1.0/include/atmega128.h:29:
In file included from
/opt/local/var/macports/build/_Volumes_Shared_macports-ports_emulators_simulavr/simulavr/work/simulavr-release-1.1.0/include/avrdevice.h:29:
In file included from
/Library/Developer/CommandLineTools/SDKs/MacOSX12.sdk/usr/include/c++/v1/string:511:
In file included from
/Library/Developer/CommandLineTools/SDKs/MacOSX12.sdk/usr/include/c++/v1/string_view:179:
In file included from
/Library/Developer/CommandLineTools/SDKs/MacOSX12.sdk/usr/include/c++/v1/__string:57:
In file included from
/Library/Developer/CommandLineTools/SDKs/MacOSX12.sdk/usr/include/c++/v1/algorithm:649:
In file included from
/Library/Developer/CommandLineTools/SDKs/MacOSX12.sdk/usr/include/c++/v1/initializer_list:46:
In file included from
/Library/Developer/CommandLineTools/SDKs/MacOSX12.sdk/usr/include/c++/v1/cstddef:37:
/opt/local/var/macports/build/_Volumes_Shared_macports-ports_emulators_simulavr/simulavr/work/simulavr-release-1.1.0/include/elfio/version:1:1:
error: unknown type name 'This'
This is ElfIO version 2.2, see http://elfio.sourceforge.net/.
^


This happens because C++20 has a <version> header which other system headers
include (even when not in C++20 mode), and the directory include/elfio
contains a file called VERSION, and that directory is in the include path. For
more background see https://bugs.llvm.org/show_bug.cgi?id=42540

The best solution is not adding that directory to the include path. Another
solution is renaming or removing the VERSION file. Sometimes projects need the
VERSION file for something, but I did not see any errors after removing the
VERSION file and it built successfully.








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