FTBS w/ GCC 15 for ppc64le #2443
Description
Fedora Rawhide switched to GCC 15, and libjxl fails to build now on ppc64le: https://kojipkgs.fedoraproject.org//work/tasks/522/127990522/build.log
/usr/include/hwy/ops/ppc_vsx-inl.h: In function ‘hwy::N_PPC8::VFromD<D> hwy::N_PPC8::PromoteTo(D, VFromD<typename D::Rebind<float> >)’:
/usr/include/hwy/ops/ppc_vsx-inl.h:3692:33: error: there are no arguments to ‘__builtin_vsx_xvcvspsxds’ that depend on a template parameter, so a declaration of ‘__builtin_vsx_xvcvspsxds’ must be available [-Wtemplate-body]
3692 | return VFromD<decltype(di64)>{__builtin_vsx_xvcvspsxds(raw_v)};
| ^~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/hwy/ops/ppc_vsx-inl.h:3692:33: note: (if you use ‘-fpermissive’, G++ will accept your code, but allowing the use of an undeclared name is deprecated)
/usr/include/hwy/ops/ppc_vsx-inl.h: In function ‘hwy::N_PPC8::VFromD<D> hwy::N_PPC8::PromoteTo(D, VFromD<typename D::Rebind<float> >)’:
/usr/include/hwy/ops/ppc_vsx-inl.h:3706:7: error: there are no arguments to ‘__builtin_vsx_xvcvspuxds’ that depend on a template parameter, so a declaration of ‘__builtin_vsx_xvcvspuxds’ must be available [-Wtemplate-body]
3706 | __builtin_vsx_xvcvspuxds(raw_v))};
| ^~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/hwy/ops/ppc_vsx-inl.h: In function ‘hwy::N_PPC8::VFromD<D> hwy::N_PPC8::PromoteUpperTo(D, Vec128<float>)’:
/usr/include/hwy/ops/ppc_vsx-inl.h:3816:33: error: there are no arguments to ‘__builtin_vsx_xvcvspsxds’ that depend on a template parameter, so a declaration of ‘__builtin_vsx_xvcvspsxds’ must be available [-Wtemplate-body]
3816 | return VFromD<decltype(di64)>{__builtin_vsx_xvcvspsxds(raw_v)};
| ^~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/hwy/ops/ppc_vsx-inl.h: In function ‘hwy::N_PPC8::VFromD<D> hwy::N_PPC8::PromoteUpperTo(D, Vec128<float>)’:
/usr/include/hwy/ops/ppc_vsx-inl.h:3831:7: error: there are no arguments to ‘__builtin_vsx_xvcvspuxds’ that depend on a template parameter, so a declaration of ‘__builtin_vsx_xvcvspuxds’ must be available [-Wtemplate-body]
3831 | __builtin_vsx_xvcvspuxds(raw_v))};
| ^~~~~~~~~~~~~~~~~~~~~~~~