Fails to compile with LTO

-flto=4 -Werror=odr -Werror=lto-type-mismatch -Werror=strict-aliasing

ninja -v -j8 -l0
[1/6] : && /usr/bin/x86_64-pc-linux-gnu-g++ -fPIC -march=native -fstack-protector-all -O2 -pipe -fdiagnostics-color=always -frecord-gcc-switches -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=3 -fstack-clash-protection -flto=4 -Werror=odr -Werror=lto-type-mismatch -Werror=strict-aliasing  -Wformat -Werror=format-security -Wall -Wextra -Wno-strict-aliasing -Wno-cast-function-type -fvisibility=hidden -D QT_NO_CAST_FROM_ASCII -D QT_NO_CAST_TO_ASCII  -Wl,-O1 -Wl,--as-needed -flto=4 -Werror=odr -Werror=lto-type-mismatch -Werror=strict-aliasing -Wl,--defsym=__gentoo_check_ldflags__=0 -shared -Wl,-soname,libshiboken6-python3.11.so.6.6 -o libshiboken/libshiboken6-python3.11.so.6.6.2 libshiboken/CMakeFiles/libshiboken.dir/basewrapper.cpp.o libshiboken/CMakeFiles/libshiboken.dir/bindingmanager.cpp.o libshiboken/CMakeFiles/libshiboken.dir/bufferprocs_py37.cpp.o libshiboken/CMakeFiles/libshiboken.dir/debugfreehook.cpp.o libshiboken/CMakeFiles/libshiboken.dir/gilstate.cpp.o libshiboken/CMakeFiles/libshiboken.dir/helper.cpp.o libshiboken/CMakeFiles/libshiboken.dir/pep384impl.cpp.o libshiboken/CMakeFiles/libshiboken.dir/sbkarrayconverter.cpp.o libshiboken/CMakeFiles/libshiboken.dir/sbkcontainer.cpp.o libshiboken/CMakeFiles/libshiboken.dir/sbkconverter.cpp.o libshiboken/CMakeFiles/libshiboken.dir/sbkcppstring.cpp.o libshiboken/CMakeFiles/libshiboken.dir/sbkenum.cpp.o libshiboken/CMakeFiles/libshiboken.dir/sbkerrors.cpp.o libshiboken/CMakeFiles/libshiboken.dir/sbkfeature_base.cpp.o libshiboken/CMakeFiles/libshiboken.dir/sbkmodule.cpp.o libshiboken/CMakeFiles/libshiboken.dir/sbknumpy.cpp.o libshiboken/CMakeFiles/libshiboken.dir/sbksmartpointer.cpp.o libshiboken/CMakeFiles/libshiboken.dir/sbkstaticstrings.cpp.o libshiboken/CMakeFiles/libshiboken.dir/sbkstring.cpp.o libshiboken/CMakeFiles/libshiboken.dir/sbktypefactory.cpp.o libshiboken/CMakeFiles/libshiboken.dir/shibokenbuffer.cpp.o libshiboken/CMakeFiles/libshiboken.dir/threadstatesaver.cpp.o libshiboken/CMakeFiles/libshiboken.dir/voidptr.cpp.o libshiboken/CMakeFiles/libshiboken.dir/signature/signature.cpp.o libshiboken/CMakeFiles/libshiboken.dir/signature/signature_globals.cpp.o libshiboken/CMakeFiles/libshiboken.dir/signature/signature_extend.cpp.o libshiboken/CMakeFiles/libshiboken.dir/signature/signature_helper.cpp.o  -Wl,-rpath,:::::::: && :
FAILED: libshiboken/libshiboken6-python3.11.so.6.6.2 
: && /usr/bin/x86_64-pc-linux-gnu-g++ -fPIC -march=native -fstack-protector-all -O2 -pipe -fdiagnostics-color=always -frecord-gcc-switches -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=3 -fstack-clash-protection -flto=4 -Werror=odr -Werror=lto-type-mismatch -Werror=strict-aliasing  -Wformat -Werror=format-security -Wall -Wextra -Wno-strict-aliasing -Wno-cast-function-type -fvisibility=hidden -D QT_NO_CAST_FROM_ASCII -D QT_NO_CAST_TO_ASCII  -Wl,-O1 -Wl,--as-needed -flto=4 -Werror=odr -Werror=lto-type-mismatch -Werror=strict-aliasing -Wl,--defsym=__gentoo_check_ldflags__=0 -shared -Wl,-soname,libshiboken6-python3.11.so.6.6 -o libshiboken/libshiboken6-python3.11.so.6.6.2 libshiboken/CMakeFiles/libshiboken.dir/basewrapper.cpp.o libshiboken/CMakeFiles/libshiboken.dir/bindingmanager.cpp.o libshiboken/CMakeFiles/libshiboken.dir/bufferprocs_py37.cpp.o libshiboken/CMakeFiles/libshiboken.dir/debugfreehook.cpp.o libshiboken/CMakeFiles/libshiboken.dir/gilstate.cpp.o libshiboken/CMakeFiles/libshiboken.dir/helper.cpp.o libshiboken/CMakeFiles/libshiboken.dir/pep384impl.cpp.o libshiboken/CMakeFiles/libshiboken.dir/sbkarrayconverter.cpp.o libshiboken/CMakeFiles/libshiboken.dir/sbkcontainer.cpp.o libshiboken/CMakeFiles/libshiboken.dir/sbkconverter.cpp.o libshiboken/CMakeFiles/libshiboken.dir/sbkcppstring.cpp.o libshiboken/CMakeFiles/libshiboken.dir/sbkenum.cpp.o libshiboken/CMakeFiles/libshiboken.dir/sbkerrors.cpp.o libshiboken/CMakeFiles/libshiboken.dir/sbkfeature_base.cpp.o libshiboken/CMakeFiles/libshiboken.dir/sbkmodule.cpp.o libshiboken/CMakeFiles/libshiboken.dir/sbknumpy.cpp.o libshiboken/CMakeFiles/libshiboken.dir/sbksmartpointer.cpp.o libshiboken/CMakeFiles/libshiboken.dir/sbkstaticstrings.cpp.o libshiboken/CMakeFiles/libshiboken.dir/sbkstring.cpp.o libshiboken/CMakeFiles/libshiboken.dir/sbktypefactory.cpp.o libshiboken/CMakeFiles/libshiboken.dir/shibokenbuffer.cpp.o libshiboken/CMakeFiles/libshiboken.dir/threadstatesaver.cpp.o libshiboken/CMakeFiles/libshiboken.dir/voidptr.cpp.o libshiboken/CMakeFiles/libshiboken.dir/signature/signature.cpp.o libshiboken/CMakeFiles/libshiboken.dir/signature/signature_globals.cpp.o libshiboken/CMakeFiles/libshiboken.dir/signature/signature_extend.cpp.o libshiboken/CMakeFiles/libshiboken.dir/signature/signature_helper.cpp.o  -Wl,-rpath,:::::::: && :
/var/tmp/portage/dev-python/shiboken6-6.6.2/work/pyside-setup-everywhere-src-6.6.2/sources/shiboken6/libshiboken/pep384impl.h:53:16: error: type ‘struct _typeobject’ violates the C++ One Definition Rule [-Werror=odr]
   53 | typedef struct _typeobject {
      |                ^
/var/tmp/portage/dev-python/shiboken6-6.6.2/work/pyside-setup-everywhere-src-6.6.2/sources/shiboken6/libshiboken/pep384impl.h:53:16: note: a different type is defined in another translation unit
   53 | typedef struct _typeobject {
      |                ^
/var/tmp/portage/dev-python/shiboken6-6.6.2/work/pyside-setup-everywhere-src-6.6.2/sources/shiboken6/libshiboken/pep384impl.h:88:11: note: the first difference of corresponding definitions is field ‘X31’
   88 |     void *X31;
      |           ^
/var/tmp/portage/dev-python/shiboken6-6.6.2/work/pyside-setup-everywhere-src-6.6.2/sources/shiboken6/libshiboken/pep384impl.h:86:15: note: a field with different name is defined in another translation unit
   86 |     PyObject *tp_dict;
      |               ^
/var/tmp/portage/dev-python/shiboken6-6.6.2/work/pyside-setup-everywhere-src-6.6.2/sources/shiboken6/libshiboken/pep384impl.h:502:38: error: ‘PepStaticMethod_TypePtr’ violates the C++ One Definition Rule [-Werror=odr]
  502 | extern LIBSHIBOKEN_API PyTypeObject *PepStaticMethod_TypePtr;
      |                                      ^
/var/tmp/portage/dev-python/shiboken6-6.6.2/work/pyside-setup-everywhere-src-6.6.2/sources/shiboken6/libshiboken/pep384impl.cpp:720:15: note: type ‘struct PyTypeObject’ itself violates the C++ One Definition Rule
  720 | PyTypeObject *PepStaticMethod_TypePtr = nullptr;
      |               ^
/var/tmp/portage/dev-python/shiboken6-6.6.2/work/pyside-setup-everywhere-src-6.6.2/sources/shiboken6/libshiboken/pep384impl.cpp:720:15: note: ‘PepStaticMethod_TypePtr’ was previously declared here
/var/tmp/portage/dev-python/shiboken6-6.6.2/work/pyside-setup-everywhere-src-6.6.2/sources/shiboken6/libshiboken/pep384impl.h:348:38: error: ‘PepFunction_TypePtr’ violates the C++ One Definition Rule [-Werror=odr]
  348 | extern LIBSHIBOKEN_API PyTypeObject *PepFunction_TypePtr;
      |                                      ^
/var/tmp/portage/dev-python/shiboken6-6.6.2/work/pyside-setup-everywhere-src-6.6.2/sources/shiboken6/libshiboken/pep384impl.cpp:697:15: note: type ‘struct PyTypeObject’ itself violates the C++ One Definition Rule
  697 | PyTypeObject *PepFunction_TypePtr = nullptr;
      |               ^
/var/tmp/portage/dev-python/shiboken6-6.6.2/work/pyside-setup-everywhere-src-6.6.2/sources/shiboken6/libshiboken/pep384impl.cpp:697:15: note: ‘PepFunction_TypePtr’ was previously declared here
/var/tmp/portage/dev-python/shiboken6-6.6.2/work/pyside-setup-everywhere-src-6.6.2/sources/shiboken6/libshiboken/pep384impl.h:370:38: error: ‘PepMethod_TypePtr’ violates the C++ One Definition Rule [-Werror=odr]
  370 | extern LIBSHIBOKEN_API PyTypeObject *PepMethod_TypePtr;
      |                                      ^
/var/tmp/portage/dev-python/shiboken6-6.6.2/work/pyside-setup-everywhere-src-6.6.2/sources/shiboken6/libshiboken/pep384impl.cpp:636:15: note: type ‘struct PyTypeObject’ itself violates the C++ One Definition Rule
  636 | PyTypeObject *PepMethod_TypePtr = nullptr;
      |               ^
/var/tmp/portage/dev-python/shiboken6-6.6.2/work/pyside-setup-everywhere-src-6.6.2/sources/shiboken6/libshiboken/pep384impl.cpp:636:15: note: ‘PepMethod_TypePtr’ was previously declared here
/usr/include/python3.11/dictobject.h:15:26: error: ‘PyDict_Type’ violates the C++ One Definition Rule [-Werror=odr]
   15 | PyAPI_DATA(PyTypeObject) PyDict_Type;
      |                          ^
/usr/include/python3.11/dictobject.h:15:26: note: type ‘struct PyTypeObject’ itself violates the C++ One Definition Rule
   15 | PyAPI_DATA(PyTypeObject) PyDict_Type;
      |                          ^
/usr/include/python3.11/dictobject.h:15:26: note: ‘PyDict_Type’ was previously declared here
/usr/include/python3.11/object.h:269:26: error: ‘PyType_Type’ violates the C++ One Definition Rule [-Werror=odr]
  269 | PyAPI_DATA(PyTypeObject) PyType_Type; /* built-in 'type' */
      |                          ^
/usr/include/python3.11/object.h:269:26: note: type ‘struct PyTypeObject’ itself violates the C++ One Definition Rule
  269 | PyAPI_DATA(PyTypeObject) PyType_Type; /* built-in 'type' */
      |                          ^
/usr/include/python3.11/object.h:269:26: note: ‘PyType_Type’ was previously declared here
lto1: some warnings being treated as errors
lto-wrapper: fatal error: /usr/bin/x86_64-pc-linux-gnu-g++ returned 1 exit status
compilation terminated.
/usr/lib/gcc/x86_64-pc-linux-gnu/13/../../../../x86_64-pc-linux-gnu/bin/ld: error: lto-wrapper failed
collect2: error: ld returned 1 exit status
[2/6] : && /usr/bin/x86_64-pc-linux-gnu-g++ -march=native -fstack-protector-all -O2 -pipe -fdiagnostics-color=always -frecord-gcc-switches -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=3 -fstack-clash-protection -flto=4 -Werror=odr -Werror=lto-type-mismatch -Werror=strict-aliasing  -Wformat -Werror=format-security -Wall -Wextra -Wno-strict-aliasing -Wno-cast-function-type -fvisibility=hidden -D QT_NO_CAST_FROM_ASCII -D QT_NO_CAST_TO_ASCII -Wl,-O1 -Wl,--as-needed -flto=4 -Werror=odr -Werror=lto-type-mismatch -Werror=strict-aliasing -Wl,--defsym=__gentoo_check_ldflags__=0 generator/CMakeFiles/shiboken6.dir/shiboken6_autogen/mocs_compilation.cpp.o generator/CMakeFiles/shiboken6.dir/defaultvalue.cpp.o generator/CMakeFiles/shiboken6.dir/generator.cpp.o generator/CMakeFiles/shiboken6.dir/generatorcontext.cpp.o generator/CMakeFiles/shiboken6.dir/main.cpp.o generator/CMakeFiles/shiboken6.dir/shiboken/cppgenerator.cpp.o generator/CMakeFiles/shiboken6.dir/shiboken/cppgenerator_container.cpp.o generator/CMakeFiles/shiboken6.dir/shiboken/cppgenerator_smartpointer.cpp.o generator/CMakeFiles/shiboken6.dir/shiboken/generatorargument.cpp.o generator/CMakeFiles/shiboken6.dir/shiboken/headergenerator.cpp.o generator/CMakeFiles/shiboken6.dir/shiboken/overloaddata.cpp.o generator/CMakeFiles/shiboken6.dir/shiboken/shibokengenerator.cpp.o generator/CMakeFiles/shiboken6.dir/qtdoc/qtdocgenerator.cpp.o generator/CMakeFiles/shiboken6.dir/qtdoc/qtxmltosphinx.cpp.o -o generator/shiboken6  -Wl,-rpath,/usr/lib/llvm/17/lib64::::::::::::::::::  ApiExtractor/libapiextractor.a  /usr/lib64/libQt6Core.so.6.6.2  /usr/lib/llvm/17/lib64/libclang.so.17.0.6  /usr/lib64/libxslt.so  /usr/lib64/libxml2.so  -Wl,-rpath-link,/usr/lib/llvm/17/lib64 && :
FAILED: generator/shiboken6 
: && /usr/bin/x86_64-pc-linux-gnu-g++ -march=native -fstack-protector-all -O2 -pipe -fdiagnostics-color=always -frecord-gcc-switches -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=3 -fstack-clash-protection -flto=4 -Werror=odr -Werror=lto-type-mismatch -Werror=strict-aliasing  -Wformat -Werror=format-security -Wall -Wextra -Wno-strict-aliasing -Wno-cast-function-type -fvisibility=hidden -D QT_NO_CAST_FROM_ASCII -D QT_NO_CAST_TO_ASCII -Wl,-O1 -Wl,--as-needed -flto=4 -Werror=odr -Werror=lto-type-mismatch -Werror=strict-aliasing -Wl,--defsym=__gentoo_check_ldflags__=0 generator/CMakeFiles/shiboken6.dir/shiboken6_autogen/mocs_compilation.cpp.o generator/CMakeFiles/shiboken6.dir/defaultvalue.cpp.o generator/CMakeFiles/shiboken6.dir/generator.cpp.o generator/CMakeFiles/shiboken6.dir/generatorcontext.cpp.o generator/CMakeFiles/shiboken6.dir/main.cpp.o generator/CMakeFiles/shiboken6.dir/shiboken/cppgenerator.cpp.o generator/CMakeFiles/shiboken6.dir/shiboken/cppgenerator_container.cpp.o generator/CMakeFiles/shiboken6.dir/shiboken/cppgenerator_smartpointer.cpp.o generator/CMakeFiles/shiboken6.dir/shiboken/generatorargument.cpp.o generator/CMakeFiles/shiboken6.dir/shiboken/headergenerator.cpp.o generator/CMakeFiles/shiboken6.dir/shiboken/overloaddata.cpp.o generator/CMakeFiles/shiboken6.dir/shiboken/shibokengenerator.cpp.o generator/CMakeFiles/shiboken6.dir/qtdoc/qtdocgenerator.cpp.o generator/CMakeFiles/shiboken6.dir/qtdoc/qtxmltosphinx.cpp.o -o generator/shiboken6  -Wl,-rpath,/usr/lib/llvm/17/lib64::::::::::::::::::  ApiExtractor/libapiextractor.a  /usr/lib64/libQt6Core.so.6.6.2  /usr/lib/llvm/17/lib64/libclang.so.17.0.6  /usr/lib64/libxslt.so  /usr/lib64/libxml2.so  -Wl,-rpath-link,/usr/lib/llvm/17/lib64 && :
/var/tmp/portage/dev-python/shiboken6-6.6.2/work/pyside-setup-everywhere-src-6.6.2/sources/shiboken6/generator/qtdoc/qtxmltosphinx.cpp:180:12: error: type ‘WebXmlTag’ violates the C++ One Definition Rule [-Werror=odr]
  180 | enum class WebXmlTag {
      |            ^
/var/tmp/portage/dev-python/shiboken6-6.6.2/work/pyside-setup-everywhere-src-6.6.2/sources/shiboken6/ApiExtractor/classdocumentation.cpp:86:12: note: an enum with different value name is defined in another translation unit
   86 | enum class WebXmlTag
      |            ^
/var/tmp/portage/dev-python/shiboken6-6.6.2/work/pyside-setup-everywhere-src-6.6.2/sources/shiboken6/generator/qtdoc/qtxmltosphinx.cpp:181:5: note: name ‘Unknown’ differs from name ‘Class’ defined in another translation unit
  181 |     Unknown,
      |     ^
/var/tmp/portage/dev-python/shiboken6-6.6.2/work/pyside-setup-everywhere-src-6.6.2/sources/shiboken6/ApiExtractor/classdocumentation.cpp:88:5: note: mismatching definition
   88 |     Class, Description, Enum, Function, Parameter, Property, Typedef, Other
      |     ^
lto1: some warnings being treated as errors
lto-wrapper: fatal error: /usr/bin/x86_64-pc-linux-gnu-g++ returned 1 exit status
compilation terminated.
/usr/lib/gcc/x86_64-pc-linux-gnu/13/../../../../x86_64-pc-linux-gnu/bin/ld: error: lto-wrapper failed
collect2: error: ld returned 1 exit status