https://bugs.kde.org/show_bug.cgi?id=453759
Bug ID: 453759
Summary: KSyntaxHighlighting does not build with a C++20
compiler on Windows
Product: frameworks-syntax-highlighting
Version: 5.93.0
Platform: Microsoft Windows
OS: Microsoft Windows
Status: REPORTED
Severity: critical
Priority: NOR
Component: framework
Assignee: kwrite-bugs-n...@kde.org
Reporter: nicolas.arnaudcor...@gmail.com
Target Milestone: ---
SUMMARY
KSyntaxHighlighting does not compile with Visual Studio 2022 and C++20.
(You need a C++20 compiler that support the new format standard library
feature)
STEPS TO REPRODUCE
1. Compile KSyntaxHighlighting with Visual Studio 2022 in C++20 mode...
OBSERVED RESULT
Thousands of errors like that:
```
C:\Program Files (x86)\Microsoft Visual
Studio\2019\Professional\VC\Tools\MSVC\14.29.30133\include\chrono(4595): error
C2760: syntax error: unexpected token 'identifier', expected 'type specifier'
C:\Program Files (x86)\Microsoft Visual
Studio\2019\Professional\VC\Tools\MSVC\14.29.30133\include\chrono(4622): error
C3646: '_Alignment': unknown override specifier
C:\Program Files (x86)\Microsoft Visual
Studio\2019\Professional\VC\Tools\MSVC\14.29.30133\include\chrono(4629): note:
see reference to class template instantiation
'std::_Chrono_format_specs<_CharT>' being compiled
C:\Program Files (x86)\Microsoft Visual
Studio\2019\Professional\VC\Tools\MSVC\14.29.30133\include\chrono(4622): error
C2059: syntax error: '='
C:\Program Files (x86)\Microsoft Visual
Studio\2019\Professional\VC\Tools\MSVC\14.29.30133\include\chrono(4622): error
C2653: '_Fmt_align': is not a class or namespace name
```
EXPECTED RESULT
It builds ;)
ADDITIONAL INFORMATION
The problem comes from the generation of headers with ecm_generate_headers.
One of the header is "Format", which will be mixed up with the standard library
one "format". Obviously, this error does not happen on Linux.
I see 2 ways to fix it:
- complex: change the generated header to something else than Format (may
impact other projects)
- easy: don't call ecm_generate_headers on Windows, or at least add a way to
not do it with a CMake variable
Maybe there's another one, I don't know.
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