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:
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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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