Build error with qt6-base-6.10.0-2 on ARCH Linux

[ubergarm]

I'm trying to compile easy_profiler for a project that depends on it. It built fine on older Ubuntu 22.04 libqt5 5.15.3 laptop, but on my ARCH Linux desktop it throws errors like easy_profiler/profiler_gui/common_functions.cpp:97:101: error: no matching function for call to ‘QChar::QChar(profiler::Value<profiler::DataType::Int8, true>::value_type)’

Here are the system details, build commands to reproduce, and the error logs:

👈 System Info

$ cat /etc/os-release
NAME="Arch Linux"
PRETTY_NAME="Arch Linux"
ID=arch
BUILD_ID=rolling
ANSI_COLOR="38;2;23;147;209"
HOME_URL="https://archlinux.org/"
DOCUMENTATION_URL="https://wiki.archlinux.org/"
SUPPORT_URL="https://bbs.archlinux.org/"
BUG_REPORT_URL="https://gitlab.archlinux.org/groups/archlinux/-/issues"
PRIVACY_POLICY_URL="https://terms.archlinux.org/docs/privacy-policy/"
LOGO=archlinux-logo

$ uname -a
Linux bigfan 6.15.4-arch2-1 #1 SMP PREEMPT_DYNAMIC Fri, 27 Jun 2025 16:35:07 +0000 x86_64 GNU/Linux

$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-pc-linux-gnu/15.1.1/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /build/gcc/src/gcc/configure --enable-languages=ada,c,c++,d,fortran,go,lto,m2,objc,obj-c++,rust,cobol --enable-bootstrap --prefix=/usr --libdir=/usr/lib --libexecdir=/usr/lib --mandir=/usr/share/man --infodir=/usr/share/info --with-bugurl=https://gitlab.archlinux.org/archlinux/packaging/packages/gcc/-/issues --with-build-config=bootstrap-lto --with-linker-hash-style=gnu --with-system-zlib --enable-__cxa_atexit --enable-cet=auto --enable-checking=release --enable-clocale=gnu --enable-default-pie --enable-default-ssp --enable-gnu-indirect-function --enable-gnu-unique-object --enable-libstdcxx-backtrace --enable-link-serialization=1 --enable-linker-build-id --enable-lto --enable-multilib --enable-plugin --enable-shared --enable-threads=posix --disable-libssp --disable-libstdcxx-pch --disable-werror
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 15.1.1 20250425 (GCC)

$ yay -Ss qt | grep Installed
extra/qt6-multimedia-ffmpeg 6.10.0-2 (541.6 KiB 2.7 MiB) (Installed)
extra/qt5-remoteobjects 5.15.17-1 (359.5 KiB 1.2 MiB) [qt5] (Installed)
extra/qt5-translations 5.15.17-1 (1.9 MiB 14.7 MiB) [qt5] (Installed)
extra/qt6-translations 6.10.0-1 (1.9 MiB 14.7 MiB) [qt6] (Installed)
extra/qt6-imageformats 6.10.0-1 (67.3 KiB 353.9 KiB) [qt6] (Installed)
extra/qt6-declarative 6.10.0-2 (16.2 MiB 111.5 MiB) [qt6] (Installed)
extra/qt6-shadertools 6.10.0-1 (1.6 MiB 4.8 MiB) [qt6] (Installed)
extra/qt5-declarative 5.15.17+kde+r21-1 (4.8 MiB 23.2 MiB) [qt5] (Installed)
extra/qt5-webchannel 5.15.17+kde+r3-1 (74.1 KiB 228.7 KiB) [qt5] (Installed)
extra/qt6-multimedia 6.10.0-2 (1.3 MiB 6.3 MiB) [qt6] (Installed)
extra/qt5-webengine 5.15.19-3 (51.3 MiB 159.2 MiB) [qt5] (Installed)
extra/qt5-location 5.15.17+kde+r7-1 (2.5 MiB 9.3 MiB) [qt5] (Installed)
extra/qt6-5compat 6.10.0-1 (509.5 KiB 2.1 MiB) [qt6] (Installed)
extra/qt6-charts 6.10.0-1 (818.6 KiB 4.4 MiB) [qt6] (Installed)
extra/qt5-base 5.15.17+kde+r123-2 (13.1 MiB 63.2 MiB) [qt5] (Installed)
extra/qt6-base 6.10.0-2 (15.1 MiB 64.3 MiB) [qt6] (Installed)
extra/qt5-svg 5.15.17+kde+r5-1 (149.3 KiB 503.3 KiB) [qt5] (Installed)
extra/qt6-svg 6.10.0-1 (280.5 KiB 974.2 KiB) [qt6] (Installed)

👈 Build Log with Errors

$ git clone git@github.com:yse/easy_profiler.git
$ cd easy_profiler
$ git branch
* develop
$ git rev-parse --short HEAD
cc0e154
$ mkdir build && cd build

$ cmake -DCMAKE_BUILD_TYPE="Release" ..
-- The CXX compiler identification is GNU 15.1.1
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/c++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
--
-- EASY_PROFILER.Core version = 2.1.0
--
-- -------- EASY_PROFILER OPTIONS: --------
--   Use rtdsc as a timer
--   Default listening port = 28077
--   Auto-start listening = OFF
--   Profile self = OFF
--   Profile self blocks initial status = OFF
--   Truncate block dynamic names = OFF (may cause crash if using dynamic block names of length >2816 symbols)
--   Check maximum EASY_VALUE data size = OFF (may cause crash if using EASY_VALUE arrays of total data size >2816 bytes)
--   Implicit thread registration = ON
--   Log messages = OFF
--   Function names pretty-print = OFF
--   Use EasyProfiler colors palette = ON
--   Shared library: ON
-- ------ END EASY_PROFILER OPTIONS -------
--
-- Performing Test CMAKE_HAVE_LIBC_PTHREAD
-- Performing Test CMAKE_HAVE_LIBC_PTHREAD - Success
-- Found Threads: TRUE
-- Performing Test HAVE_STDATOMIC
-- Performing Test HAVE_STDATOMIC - Success
-- Found WrapAtomic: TRUE
-- Found OpenGL: /usr/lib/libOpenGL.so
-- Found WrapOpenGL: TRUE
-- Found WrapVulkanHeaders: /usr/include
-- Using Qt v6.10.0
-- Configuring done (0.3s)
-- Generating done (0.0s)
-- Build files have been written to: /home/garm/projects/easy_profiler/build

$ make
[  1%] Building CXX object easy_profiler_core/CMakeFiles/easy_profiler.dir/base_block_descriptor.cpp.o
[  3%] Building CXX object easy_profiler_core/CMakeFiles/easy_profiler.dir/block.cpp.o
[  5%] Building CXX object easy_profiler_core/CMakeFiles/easy_profiler.dir/block_descriptor.cpp.o
[  7%] Building CXX object easy_profiler_core/CMakeFiles/easy_profiler.dir/easy_socket.cpp.o
[  8%] Building CXX object easy_profiler_core/CMakeFiles/easy_profiler.dir/event_trace_win.cpp.o
[ 10%] Building CXX object easy_profiler_core/CMakeFiles/easy_profiler.dir/nonscoped_block.cpp.o
[ 12%] Building CXX object easy_profiler_core/CMakeFiles/easy_profiler.dir/profile_manager.cpp.o
[ 14%] Building CXX object easy_profiler_core/CMakeFiles/easy_profiler.dir/profiler.cpp.o
[ 16%] Building CXX object easy_profiler_core/CMakeFiles/easy_profiler.dir/reader.cpp.o
[ 17%] Building CXX object easy_profiler_core/CMakeFiles/easy_profiler.dir/serialized_block.cpp.o
[ 19%] Building CXX object easy_profiler_core/CMakeFiles/easy_profiler.dir/thread_storage.cpp.o
[ 21%] Building CXX object easy_profiler_core/CMakeFiles/easy_profiler.dir/writer.cpp.o
[ 23%] Linking CXX shared library ../bin/libeasy_profiler.so
[ 23%] Built target easy_profiler
[ 23%] Built target profiler_gui_autogen_timestamp_deps
[ 25%] Automatic MOC for target profiler_gui
AutoMoc: /usr/lib/qt6/moc: /usr/lib/qt6/../libpcre2-16.so.0: no version information available (required by /usr/lib/qt6/moc)
AutoMoc: /usr/lib/qt6/moc: /usr/lib/qt6/../libpcre2-16.so.0: no version information available (required by /usr/lib/qt6/moc)
AutoMoc: /usr/lib/qt6/moc: /usr/lib/qt6/../libpcre2-16.so.0: no version information available (required by /usr/lib/qt6/moc)
AutoMoc: /usr/lib/qt6/moc: /usr/lib/qt6/../libpcre2-16.so.0: no version information available (required by /usr/lib/qt6/moc)
AutoMoc: /usr/lib/qt6/moc: /usr/lib/qt6/../libpcre2-16.so.0: no version information available (required by /usr/lib/qt6/moc)
AutoMoc: /usr/lib/qt6/moc: /usr/lib/qt6/../libpcre2-16.so.0: no version information available (required by /usr/lib/qt6/moc)
AutoMoc: /usr/lib/qt6/moc: /usr/lib/qt6/../libpcre2-16.so.0: no version information available (required by /usr/lib/qt6/moc)
AutoMoc: /usr/lib/qt6/moc: /usr/lib/qt6/../libpcre2-16.so.0: no version information available (required by /usr/lib/qt6/moc)
AutoMoc: /usr/lib/qt6/moc: /usr/lib/qt6/../libpcre2-16.so.0: no version information available (required by /usr/lib/qt6/moc)
AutoMoc: /usr/lib/qt6/moc: /usr/lib/qt6/../libpcre2-16.so.0: no version information available (required by /usr/lib/qt6/moc)
AutoMoc: /usr/lib/qt6/moc: /usr/lib/qt6/../libpcre2-16.so.0: no version information available (required by /usr/lib/qt6/moc)
AutoMoc: /usr/lib/qt6/moc: /usr/lib/qt6/../libpcre2-16.so.0: no version information available (required by /usr/lib/qt6/moc)
AutoMoc: /usr/lib/qt6/moc: /usr/lib/qt6/../libpcre2-16.so.0: no version information available (required by /usr/lib/qt6/moc)
AutoMoc: /usr/lib/qt6/moc: /usr/lib/qt6/../libpcre2-16.so.0: no version information available (required by /usr/lib/qt6/moc)
AutoMoc: /usr/lib/qt6/moc: /usr/lib/qt6/../libpcre2-16.so.0: no version information available (required by /usr/lib/qt6/moc)
AutoMoc: /usr/lib/qt6/moc: /usr/lib/qt6/../libpcre2-16.so.0: no version information available (required by /usr/lib/qt6/moc)
AutoMoc: /usr/lib/qt6/moc: /usr/lib/qt6/../libpcre2-16.so.0: no version information available (required by /usr/lib/qt6/moc)
AutoMoc: /usr/lib/qt6/moc: /usr/lib/qt6/../libpcre2-16.so.0: no version information available (required by /usr/lib/qt6/moc)
[ 25%] Built target profiler_gui_autogen
[ 26%] Automatic RCC for resources.qrc
[ 28%] Building CXX object profiler_gui/CMakeFiles/profiler_gui.dir/profiler_gui_autogen/mocs_compilation.cpp.o
[ 30%] Building CXX object profiler_gui/CMakeFiles/profiler_gui.dir/main.cpp.o
[ 32%] Building CXX object profiler_gui/CMakeFiles/profiler_gui.dir/arbitrary_value_inspector.cpp.o
[ 33%] Building CXX object profiler_gui/CMakeFiles/profiler_gui.dir/arbitrary_value_tooltip.cpp.o
[ 35%] Building CXX object profiler_gui/CMakeFiles/profiler_gui.dir/blocks_graphics_view.cpp.o
/home/garm/projects/easy_profiler/profiler_gui/blocks_graphics_view.cpp: In member function ‘virtual void ThreadNamesWidget::mousePressEvent(QMouseEvent*)’:
/home/garm/projects/easy_profiler/profiler_gui/blocks_graphics_view.cpp:3289:159: warning: ‘QMouseEvent::QMouseEvent(QEvent::Type, const QPointF&, Qt::MouseButton, Qt::MouseButtons, Qt::KeyboardModifiers, const QPointingDevice*)’ is deprecated: Use another constructor [-Wdeprecated-declarations]
 3289 | ) - QPointF(sceneRect().width(), 0), _event->button(), _event->buttons() & ~Qt::RightButton, _event->modifiers());
      |                                                                                                                 ^
In file included from /usr/include/qt6/QtGui/QKeyEvent:1,
                 from /home/garm/projects/easy_profiler/profiler_gui/blocks_graphics_view.cpp:75:
/usr/include/qt6/QtGui/qevent.h:202:5: note: declared here
  202 |     QMouseEvent(Type type, const QPointF &localPos, Qt::MouseButton button,
      |     ^~~~~~~~~~~
/home/garm/projects/easy_profiler/profiler_gui/blocks_graphics_view.cpp: In member function ‘virtual void ThreadNamesWidget::mouseReleaseEvent(QMouseEvent*)’:
/home/garm/projects/easy_profiler/profiler_gui/blocks_graphics_view.cpp:3328:159: warning: ‘QMouseEvent::QMouseEvent(QEvent::Type, const QPointF&, Qt::MouseButton, Qt::MouseButtons, Qt::KeyboardModifiers, const QPointingDevice*)’ is deprecated: Use another constructor [-Wdeprecated-declarations]
 3328 | ) - QPointF(sceneRect().width(), 0), _event->button(), _event->buttons() & ~Qt::RightButton, _event->modifiers());
      |                                                                                                                 ^
/usr/include/qt6/QtGui/qevent.h:202:5: note: declared here
  202 |     QMouseEvent(Type type, const QPointF &localPos, Qt::MouseButton button,
      |     ^~~~~~~~~~~
/home/garm/projects/easy_profiler/profiler_gui/blocks_graphics_view.cpp: In member function ‘virtual void ThreadNamesWidget::mouseMoveEvent(QMouseEvent*)’:
/home/garm/projects/easy_profiler/profiler_gui/blocks_graphics_view.cpp:3337:159: warning: ‘QMouseEvent::QMouseEvent(QEvent::Type, const QPointF&, Qt::MouseButton, Qt::MouseButtons, Qt::KeyboardModifiers, const QPointingDevice*)’ is deprecated: Use another constructor [-Wdeprecated-declarations]
 3337 | ) - QPointF(sceneRect().width(), 0), _event->button(), _event->buttons() & ~Qt::RightButton, _event->modifiers());
      |                                                                                                                 ^
/usr/include/qt6/QtGui/qevent.h:202:5: note: declared here
  202 |     QMouseEvent(Type type, const QPointF &localPos, Qt::MouseButton button,
      |     ^~~~~~~~~~~
[ 37%] Building CXX object profiler_gui/CMakeFiles/profiler_gui.dir/blocks_tree_widget.cpp.o
[ 39%] Building CXX object profiler_gui/CMakeFiles/profiler_gui.dir/bookmarks_editor.cpp.o
[ 41%] Building CXX object profiler_gui/CMakeFiles/profiler_gui.dir/common_functions.cpp.o
/home/garm/projects/easy_profiler/profiler_gui/common_functions.cpp: In function ‘QString arrayToString(const profiler::ArbitraryValue&, int)’:
/home/garm/projects/easy_profiler/profiler_gui/common_functions.cpp:97:101: error: no matching function for call to ‘QChar::QChar(profiler::Value<profiler::DataType::Int8, true>::value_type)’
   97 |         case profiler::DataType::Int8:   return QChar(_serializedValue.toArray<int8_t>()->at(_index));
      |                                                                                                     ^
/home/garm/projects/easy_profiler/profiler_gui/common_functions.cpp:97:101: note: there are 8 candidates
In file included from /usr/include/qt6/QtCore/qstring.h:15,
                 from /usr/include/qt6/QtCore/qhashfunctions.h:9,
                 from /usr/include/qt6/QtCore/qlist.h:11,
                 from /home/garm/projects/easy_profiler/profiler_gui/common_functions.cpp:56:
/usr/include/qt6/QtCore/qchar.h:149:43: note: candidate 1: ‘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 2: ‘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 3: ‘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 4: ‘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 5: ‘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 6: ‘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 7: ‘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 ‘profiler::Value<profiler::DataType::Int8, true>::value_type’ {aka ‘signed char’} to ‘const QChar&’
/usr/include/qt6/QtCore/qchar.h:48:31: note: candidate 8: ‘constexpr QChar::QChar(QChar&&)’
/usr/include/qt6/QtCore/qchar.h:48:31: note: no known conversion for argument 1 from ‘profiler::Value<profiler::DataType::Int8, true>::value_type’ {aka ‘signed char’} to ‘QChar&&’
/home/garm/projects/easy_profiler/profiler_gui/common_functions.cpp: In function ‘QString singleValueToString(const profiler::ArbitraryValue&)’:
/home/garm/projects/easy_profiler/profiler_gui/common_functions.cpp:118:98: error: no matching function for call to ‘QChar::QChar(profiler::Value<profiler::DataType::Int8, false>::value_type)’
  118 |         case profiler::DataType::Int8:   return QChar(_serializedValue.toValue<int8_t>()->value());
      |                                                                                                  ^
/home/garm/projects/easy_profiler/profiler_gui/common_functions.cpp:118:98: note: there are 8 candidates
/usr/include/qt6/QtCore/qchar.h:149:43: note: candidate 1: ‘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 2: ‘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 3: ‘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 4: ‘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 5: ‘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 6: ‘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 7: ‘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 ‘profiler::Value<profiler::DataType::Int8, false>::value_type’ {aka ‘signed char’} to ‘const QChar&’
/usr/include/qt6/QtCore/qchar.h:48:31: note: candidate 8: ‘constexpr QChar::QChar(QChar&&)’
/usr/include/qt6/QtCore/qchar.h:48:31: note: no known conversion for argument 1 from ‘profiler::Value<profiler::DataType::Int8, false>::value_type’ {aka ‘signed char’} to ‘QChar&&’
make[2]: *** [profiler_gui/CMakeFiles/profiler_gui.dir/build.make:242: profiler_gui/CMakeFiles/profiler_gui.dir/common_functions.cpp.o] Error 1
make[1]: *** [CMakeFiles/Makefile2:237: profiler_gui/CMakeFiles/profiler_gui.dir/all] Error 2
make: *** [Makefile:136: all] Error 2

No idea if it is related to newer qt6 no longer allowing string and qchar comparisons as per this thread https://forum.qt.io/topic/154949/qt6-comparing-to-qchar-not-working-anymore/3

I'll try removing qt6 from my system and see if it just works with the older qt5 perhaps and update this soon. Thanks!

[ubergarm]

Okay, I just removed all qt6 related stuff from my ARCH Linux box with:

yay -R obs-studio shotcut qt6-base qt6-5compat qt6-charts qt6-declarative qt6-imageformats qt6-multimedia qt6-multimedia-ffmpeg qt6-shadertools qt6-svg

Now it builds fine... Anyway, for anyone else with very new qt6 or who might see a similar error...