Problems building master #3931

dhdeangelis · 2025-04-26T15:05:16Z

dhdeangelis
Apr 26, 2025

I seek help in understanding some errors I get while building the master branch in a fresh openSUSE Tumbleweed install. The errors that appear can be seen below. I am using Qt6 (6.9.0) and GCC 14 (14.2.1 20250220).

Apparently the errors appears in "FileDialog.cpp":

"no matching function for call to ‘QChar::QChar(const FileDialogTypes&)"
"no type named ‘type’ in ‘struct std::enable_if<false, bool>' "

I have not seen these errors last time I compiled master several (~ 6 ?) weeks ago in a previous installation. This file has been edited 8 months ago so the cause has to be something still lacking in this new installation, a recent change in syntax required by compiler or a problem anywhere else. I am just having trouble figuring it out. Do these errors say something to you? Any hint will be appreciated.

 67%] Building CXX object CMakeFiles/sqlitebrowser.dir/src/FilterLineEdit.cpp.o
/usr/local/src/sqlitebrowser/src/FileDialog.cpp: In static member function ‘static QString FileDialog::getFileDialogPath(FileDialogTypes)’:
/usr/local/src/sqlitebrowser/src/FileDialog.cpp:51:54: error: no matching function for call to ‘QChar::QChar(const FileDialogTypes&)’
   51 |         return lastLocations[QString(QChar(dialogType))].toString();
      |                                                      ^
In file included from /usr/include/qt6/QtCore/qstring.h:14,
                 from /usr/include/qt6/QtCore/qdir.h:8,
                 from /usr/include/qt6/QtWidgets/qfiledialog.h:8,
                 from /usr/include/qt6/QtWidgets/QFileDialog:1,
                 from /usr/local/src/sqlitebrowser/src/FileDialog.h:4,
                 from /usr/local/src/sqlitebrowser/src/FileDialog.cpp:1:
/usr/include/qt6/QtCore/qchar.h:149:43: note: candidate: ‘template<class Char, typename std::enable_if<std::is_same<Char, unsigned char>::value, bool>::type <anonymous> > constexpr QChar::QChar(Char)’
  149 |     QT_ASCII_CAST_WARN constexpr explicit QChar(const Char c) noexcept : ucs(c) { }
      |                                           ^~~~~
/usr/include/qt6/QtCore/qchar.h:149:43: note:   template argument deduction/substitution failed:
/usr/include/qt6/QtCore/qchar.h:148:66: error: no type named ‘type’ in ‘struct std::enable_if<false, bool>’
  148 |     template <typename Char, if_explicit_ascii_warn_char<Char> = true>
      |                                                                  ^~~~
/usr/include/qt6/QtCore/qchar.h:143:45: note: candidate: ‘template<class Char, typename std::enable_if<std::is_same<Char, char>::value, bool>::type <anonymous> > constexpr QChar::QChar(Char)’
  143 |     QT_ASCII_CAST_WARN constexpr Q_IMPLICIT QChar(const Char ch) noexcept : ucs(uchar(ch)) {}
      |                                             ^~~~~
/usr/include/qt6/QtCore/qchar.h:143:45: note:   template argument deduction/substitution failed:
/usr/include/qt6/QtCore/qchar.h:142:66: error: no type named ‘type’ in ‘struct std::enable_if<false, bool>’
  142 |     template <typename Char, if_implicit_ascii_warn_char<Char> = true>
      |                                                                  ^~~~
/usr/include/qt6/QtCore/qchar.h:134:24: note: candidate: ‘template<class Char, typename std::enable_if<std::disjunction<std::is_same<Char, char32_t>, std::conjunction<std::is_same<Char, wchar_t>, std::integral_constant<bool, true> >, std::is_same<Char, int>, std::is_same<Char, unsigned int> >::value, bool>::type <anonymous> > constexpr QChar::QChar(Char)’
  134 |     constexpr explicit QChar(const Char ch) noexcept
      |                        ^~~~~
/usr/include/qt6/QtCore/qchar.h:134:24: note:   template argument deduction/substitution failed:
/usr/include/qt6/QtCore/qchar.h:133:66: error: no type named ‘type’ in ‘struct std::enable_if<false, bool>’
  133 |     template <typename Char, if_explicit_conversion_char<Char> = true>
      |                                                                  ^~~~
/usr/include/qt6/QtCore/qchar.h:132:26: note: candidate: ‘template<class Char, typename std::enable_if<std::disjunction<std::is_same<Char, short unsigned int>, std::is_same<Char, short int>, std::is_same<Char, QChar::SpecialCharacter>, std::is_same<Char, QLatin1Char>, std::conjunction<std::is_same<Char, wchar_t>, std::negation<std::integral_constant<bool, true> > >, std::is_same<Char, char16_t> >::value, bool>::type <anonymous> > constexpr QChar::QChar(Char)’
  132 |     constexpr Q_IMPLICIT QChar(const Char ch) noexcept : ucs(char16_t(ch)) {}
      |                          ^~~~~
/usr/include/qt6/QtCore/qchar.h:132:26: note:   template argument deduction/substitution failed:
/usr/include/qt6/QtCore/qchar.h:131:66: error: no type named ‘type’ in ‘struct std::enable_if<false, bool>’
  131 |     template <typename Char, if_implicit_conversion_char<Char> = true>
      |                                                                  ^~~~
/usr/include/qt6/QtCore/qchar.h:119:24: note: candidate: ‘constexpr QChar::QChar(uchar, uchar)’
  119 |     constexpr explicit QChar(uchar c, uchar r) noexcept : ucs(char16_t((r << 8) | c)) {}
      |                        ^~~~~
/usr/include/qt6/QtCore/qchar.h:119:24: note:   candidate expects 2 arguments, 1 provided
/usr/include/qt6/QtCore/qchar.h:115:26: note: candidate: ‘constexpr QChar::QChar()’
  115 |     constexpr Q_IMPLICIT QChar() noexcept : ucs(0) {}
      |                          ^~~~~
/usr/include/qt6/QtCore/qchar.h:115:26: note:   candidate expects 0 arguments, 1 provided
/usr/include/qt6/QtCore/qchar.h:48:31: note: candidate: ‘constexpr QChar::QChar(const QChar&)’
   48 | class QT6_ONLY(Q_CORE_EXPORT) QChar {
      |                               ^~~~~
/usr/include/qt6/QtCore/qchar.h:48:31: note:   no known conversion for argument 1 from ‘const FileDialogTypes’ to ‘const QChar&’
/usr/include/qt6/QtCore/qchar.h:48:31: note: candidate: ‘constexpr QChar::QChar(QChar&&)’
/usr/include/qt6/QtCore/qchar.h:48:31: note:   no known conversion for argument 1 from ‘const FileDialogTypes’ to ‘QChar&&’
/usr/local/src/sqlitebrowser/src/FileDialog.cpp: In static member function ‘static void FileDialog::setFileDialogPath(FileDialogTypes, const QString&)’:
/usr/local/src/sqlitebrowser/src/FileDialog.cpp:65:43: error: no matching function for call to ‘QChar::QChar(const FileDialogTypes&)’
   65 |     lastLocations[QString(QChar(dialogType))] = dir;
      |                                           ^
/usr/include/qt6/QtCore/qchar.h:149:43: note: candidate: ‘template<class Char, typename std::enable_if<std::is_same<Char, unsigned char>::value, bool>::type <anonymous> > constexpr QChar::QChar(Char)’
  149 |     QT_ASCII_CAST_WARN constexpr explicit QChar(const Char c) noexcept : ucs(c) { }
      |                                           ^~~~~
/usr/include/qt6/QtCore/qchar.h:149:43: note:   template argument deduction/substitution failed:
/usr/include/qt6/QtCore/qchar.h:148:66: error: no type named ‘type’ in ‘struct std::enable_if<false, bool>’
  148 |     template <typename Char, if_explicit_ascii_warn_char<Char> = true>
      |                                                                  ^~~~
/usr/include/qt6/QtCore/qchar.h:143:45: note: candidate: ‘template<class Char, typename std::enable_if<std::is_same<Char, char>::value, bool>::type <anonymous> > constexpr QChar::QChar(Char)’
  143 |     QT_ASCII_CAST_WARN constexpr Q_IMPLICIT QChar(const Char ch) noexcept : ucs(uchar(ch)) {}
      |                                             ^~~~~
/usr/include/qt6/QtCore/qchar.h:143:45: note:   template argument deduction/substitution failed:
/usr/include/qt6/QtCore/qchar.h:142:66: error: no type named ‘type’ in ‘struct std::enable_if<false, bool>’
  142 |     template <typename Char, if_implicit_ascii_warn_char<Char> = true>
      |                                                                  ^~~~
/usr/include/qt6/QtCore/qchar.h:134:24: note: candidate: ‘template<class Char, typename std::enable_if<std::disjunction<std::is_same<Char, char32_t>, std::conjunction<std::is_same<Char, wchar_t>, std::integral_constant<bool, true> >, std::is_same<Char, int>, std::is_same<Char, unsigned int> >::value, bool>::type <anonymous> > constexpr QChar::QChar(Char)’
  134 |     constexpr explicit QChar(const Char ch) noexcept
      |                        ^~~~~
/usr/include/qt6/QtCore/qchar.h:134:24: note:   template argument deduction/substitution failed:
/usr/include/qt6/QtCore/qchar.h:133:66: error: no type named ‘type’ in ‘struct std::enable_if<false, bool>’
  133 |     template <typename Char, if_explicit_conversion_char<Char> = true>
      |                                                                  ^~~~
/usr/include/qt6/QtCore/qchar.h:132:26: note: candidate: ‘template<class Char, typename std::enable_if<std::disjunction<std::is_same<Char, short unsigned int>, std::is_same<Char, short int>, std::is_same<Char, QChar::SpecialCharacter>, std::is_same<Char, QLatin1Char>, std::conjunction<std::is_same<Char, wchar_t>, std::negation<std::integral_constant<bool, true> > >, std::is_same<Char, char16_t> >::value, bool>::type <anonymous> > constexpr QChar::QChar(Char)’
  132 |     constexpr Q_IMPLICIT QChar(const Char ch) noexcept : ucs(char16_t(ch)) {}
      |                          ^~~~~
/usr/include/qt6/QtCore/qchar.h:132:26: note:   template argument deduction/substitution failed:
/usr/include/qt6/QtCore/qchar.h:131:66: error: no type named ‘type’ in ‘struct std::enable_if<false, bool>’
  131 |     template <typename Char, if_implicit_conversion_char<Char> = true>
      |                                                                  ^~~~
/usr/include/qt6/QtCore/qchar.h:119:24: note: candidate: ‘constexpr QChar::QChar(uchar, uchar)’
  119 |     constexpr explicit QChar(uchar c, uchar r) noexcept : ucs(char16_t((r << 8) | c)) {}
      |                        ^~~~~
/usr/include/qt6/QtCore/qchar.h:119:24: note:   candidate expects 2 arguments, 1 provided
/usr/include/qt6/QtCore/qchar.h:115:26: note: candidate: ‘constexpr QChar::QChar()’
  115 |     constexpr Q_IMPLICIT QChar() noexcept : ucs(0) {}
      |                          ^~~~~
/usr/include/qt6/QtCore/qchar.h:115:26: note:   candidate expects 0 arguments, 1 provided
/usr/include/qt6/QtCore/qchar.h:48:31: note: candidate: ‘constexpr QChar::QChar(const QChar&)’
   48 | class QT6_ONLY(Q_CORE_EXPORT) QChar {
      |                               ^~~~~
/usr/include/qt6/QtCore/qchar.h:48:31: note:   no known conversion for argument 1 from ‘const FileDialogTypes’ to ‘const QChar&’
/usr/include/qt6/QtCore/qchar.h:48:31: note: candidate: ‘constexpr QChar::QChar(QChar&&)’
/usr/include/qt6/QtCore/qchar.h:48:31: note:   no known conversion for argument 1 from ‘const FileDialogTypes’ to ‘QChar&&’
make[2]: *** [CMakeFiles/sqlitebrowser.dir/build.make:1210: CMakeFiles/sqlitebrowser.dir/src/FileDialog.cpp.o] Error 1
make[2]: *** Waiting for unfinished jobs....
make[1]: *** [CMakeFiles/Makefile2:141: CMakeFiles/sqlitebrowser.dir/all] Error 2
make: *** [Makefile:156: all] Error 2

Answered by dhdeangelis

May 1, 2025

Problem solved: replacing QChar for QLatin1Char in FileDialog.cpp lines 51 and 65 solves the problem and allows sqlitebrowser to be built using Qt 6.9.0.

View full answer

justinclift · 2025-04-27T00:51:04Z

justinclift
Apr 27, 2025
Maintainer

Ouch. No idea specifically for that error, but instead I'm wondering if some other compiler(s) are available in Tumbleweed that you could try? ie llvm probably is, but that's just me guessing. 😄

0 replies

dhdeangelis · 2025-04-29T08:46:52Z

dhdeangelis
Apr 29, 2025
Author

Thanks for the suggestion, @justinclift . I have now tried with clang (both 19 and 20). I still consistently get an error on FileDialog.cpp:

/usr/local/src/sqlitebrowser/src/FileDialog.cpp:65:27: error: no matching conversion for functional-style cast from 'const FileDialogTypes' to 'QChar'
   65 |     lastLocations[QString(QChar(dialogType))] = dir;

Not sure what it really means and, as before, I am also unsure whether this arises from recent changes in Qt or any linking complexity within my particular system.

0 replies

dhdeangelis · 2025-05-01T08:40:04Z

dhdeangelis
May 1, 2025
Author

I have investigated a bit more and see that there are other Qt projects having this issue at the moment. It seems to appear when using Qt 6.9.0. Have a look for example at: musescore/MuseScore#27860
Will see how this can inspire a solution for sqlitebrowser.

0 replies

dhdeangelis · 2025-05-01T09:00:39Z

dhdeangelis
May 1, 2025
Author

Problem solved: replacing QChar for QLatin1Char in FileDialog.cpp lines 51 and 65 solves the problem and allows sqlitebrowser to be built using Qt 6.9.0.

0 replies

justinclift · 2025-05-01T13:35:24Z

justinclift
May 1, 2025
Maintainer

Awesome, sounds like good research and problem solving. 😄

0 replies

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dhdeangelis Apr 26, 2025

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