Build error: `vector.hpp: error: call of overloaded 'Vec(<brace-enclosed initializer list>)' is ambiguous`

[barracuda156]

:info:build In file included from /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_math_ngsolve/ngsolve/work/ngsolve-6.2.2307/basiclinalg/bla.hpp:11,
:info:build                  from /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_math_ngsolve/ngsolve/work/ngsolve-6.2.2307/fem/fem.hpp:14,
:info:build                  from /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_math_ngsolve/ngsolve/work/ngsolve-6.2.2307/fem/maxwellintegrator.cpp:14:
:info:build /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_math_ngsolve/ngsolve/work/ngsolve-6.2.2307/basiclinalg/vector.hpp: In instantiation of 'auto ngbla::Cross(const TA&, const TB&) [with TA = Vec<3, ngcore::SIMD<double, 2> >; TB = Vec<3, ngcore::SIMD<double, 2> >; typename std::enable_if<(ConstVecSize<T>::VSIZE == 3), bool>::type <anonymous> = true; typename std::enable_if<(ConstVecSize<TB>::VSIZE == 3), bool>::type <anonymous> = true]':
:info:build /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_math_ngsolve/ngsolve/work/ngsolve-6.2.2307/fem/intrule.hpp:1861:37:   required from here
:info:build /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_math_ngsolve/ngsolve/work/ngsolve-6.2.2307/basiclinalg/vector.hpp:874:12: error: call of overloaded 'Vec(<brace-enclosed initializer list>)' is ambiguous
:info:build   874 |     return Vec<3,T>({ a(1)*b(2)-a(2)*b(1), a(2)*b(0)-a(0)*b(2), a(0)*b(1)-a(1)*b(0) });
:info:build       |            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
:info:build /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_math_ngsolve/ngsolve/work/ngsolve-6.2.2307/basiclinalg/vector.hpp:661:12: note: candidate: 'ngbla::Vec<S, T>::Vec(const TELEM&) [with int S = 3; T = ngcore::SIMD<double, 2>; TELEM = ngcore::SIMD<double, 2>]'
:info:build   661 |     INLINE Vec (const TELEM & scal)
:info:build       |            ^~~
:info:build /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_math_ngsolve/ngsolve/work/ngsolve-6.2.2307/basiclinalg/vector.hpp:654:5: note: candidate: 'constexpr ngbla::Vec<S, T>::Vec(const ngbla::Vec<S, T>&) [with int S = 3; T = ngcore::SIMD<double, 2>]'
:info:build   654 |     Vec (const Vec &) = default;
:info:build       |     ^~~
:info:build In file included from /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_math_ngsolve/ngsolve/work/ngsolve-6.2.2307/basiclinalg/bla.hpp:11,
:info:build                  from /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_math_ngsolve/ngsolve/work/ngsolve-6.2.2307/fem/fem.hpp:14,
:info:build                  from /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_math_ngsolve/ngsolve/work/ngsolve-6.2.2307/fem/diffop_grad.cpp:1:
:info:build /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_math_ngsolve/ngsolve/work/ngsolve-6.2.2307/basiclinalg/vector.hpp: In instantiation of 'auto ngbla::Cross(const TA&, const TB&) [with TA = Vec<3, ngcore::SIMD<double, 2> >; TB = Vec<3, ngcore::SIMD<double, 2> >; typename std::enable_if<(ConstVecSize<T>::VSIZE == 3), bool>::type <anonymous> = true; typename std::enable_if<(ConstVecSize<TB>::VSIZE == 3), bool>::type <anonymous> = true]':
:info:build /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_math_ngsolve/ngsolve/work/ngsolve-6.2.2307/fem/intrule.hpp:1861:37:   required from here
:info:build /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_math_ngsolve/ngsolve/work/ngsolve-6.2.2307/basiclinalg/vector.hpp:874:12: error: call of overloaded 'Vec(<brace-enclosed initializer list>)' is ambiguous
:info:build   874 |     return Vec<3,T>({ a(1)*b(2)-a(2)*b(1), a(2)*b(0)-a(0)*b(2), a(0)*b(1)-a(1)*b(0) });
:info:build       |            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
:info:build /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_math_ngsolve/ngsolve/work/ngsolve-6.2.2307/basiclinalg/vector.hpp:661:12: note: candidate: 'ngbla::Vec<S, T>::Vec(const TELEM&) [with int S = 3; T = ngcore::SIMD<double, 2>; TELEM = ngcore::SIMD<double, 2>]'
:info:build   661 |     INLINE Vec (const TELEM & scal)
:info:build       |            ^~~
:info:build /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_math_ngsolve/ngsolve/work/ngsolve-6.2.2307/basiclinalg/vector.hpp:654:5: note: candidate: 'constexpr ngbla::Vec<S, T>::Vec(const ngbla::Vec<S, T>&) [with int S = 3; T = ngcore::SIMD<double, 2>]'
:info:build   654 |     Vec (const Vec &) = default;
:info:build       |     ^~~
:info:build In file included from /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_math_ngsolve/ngsolve/work/ngsolve-6.2.2307/basiclinalg/bla.hpp:11,
:info:build                  from /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_math_ngsolve/ngsolve/work/ngsolve-6.2.2307/fem/fem.hpp:14,
:info:build                  from /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_math_ngsolve/ngsolve/work/ngsolve-6.2.2307/fem/diffop_id.cpp:1:
:info:build /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_math_ngsolve/ngsolve/work/ngsolve-6.2.2307/basiclinalg/vector.hpp: In instantiation of 'auto ngbla::Cross(const TA&, const TB&) [with TA = Vec<3, ngcore::SIMD<double, 2> >; TB = Vec<3, ngcore::SIMD<double, 2> >; typename std::enable_if<(ConstVecSize<T>::VSIZE == 3), bool>::type <anonymous> = true; typename std::enable_if<(ConstVecSize<TB>::VSIZE == 3), bool>::type <anonymous> = true]':
:info:build /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_math_ngsolve/ngsolve/work/ngsolve-6.2.2307/fem/intrule.hpp:1861:37:   required from here
:info:build /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_math_ngsolve/ngsolve/work/ngsolve-6.2.2307/basiclinalg/vector.hpp:874:12: error: call of overloaded 'Vec(<brace-enclosed initializer list>)' is ambiguous
:info:build   874 |     return Vec<3,T>({ a(1)*b(2)-a(2)*b(1), a(2)*b(0)-a(0)*b(2), a(0)*b(1)-a(1)*b(0) });
:info:build       |            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
:info:build /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_math_ngsolve/ngsolve/work/ngsolve-6.2.2307/basiclinalg/vector.hpp:661:12: note: candidate: 'ngbla::Vec<S, T>::Vec(const TELEM&) [with int S = 3; T = ngcore::SIMD<double, 2>; TELEM = ngcore::SIMD<double, 2>]'
:info:build   661 |     INLINE Vec (const TELEM & scal)
:info:build       |            ^~~
:info:build /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_math_ngsolve/ngsolve/work/ngsolve-6.2.2307/basiclinalg/vector.hpp:654:5: note: candidate: 'constexpr ngbla::Vec<S, T>::Vec(const ngbla::Vec<S, T>&) [with int S = 3; T = ngcore::SIMD<double, 2>]'
:info:build   654 |     Vec (const Vec &) = default;
:info:build       |     ^~~
:info:build In file included from /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_math_ngsolve/ngsolve/work/ngsolve-6.2.2307/basiclinalg/bla.hpp:11,
:info:build                  from /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_math_ngsolve/ngsolve/work/ngsolve-6.2.2307/fem/fem.hpp:14,
:info:build                  from /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_math_ngsolve/ngsolve/work/ngsolve-6.2.2307/fem/bdbequations.cpp:14:
:info:build /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_math_ngsolve/ngsolve/work/ngsolve-6.2.2307/basiclinalg/vector.hpp: In instantiation of 'auto ngbla::Cross(const TA&, const TB&) [with TA = Vec<3, ngcore::SIMD<double, 2> >; TB = Vec<3, ngcore::SIMD<double, 2> >; typename std::enable_if<(ConstVecSize<T>::VSIZE == 3), bool>::type <anonymous> = true; typename std::enable_if<(ConstVecSize<TB>::VSIZE == 3), bool>::type <anonymous> = true]':
:info:build /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_math_ngsolve/ngsolve/work/ngsolve-6.2.2307/fem/intrule.hpp:1861:37:   required from here
:info:build /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_math_ngsolve/ngsolve/work/ngsolve-6.2.2307/basiclinalg/vector.hpp:874:12: error: call of overloaded 'Vec(<brace-enclosed initializer list>)' is ambiguous
:info:build   874 |     return Vec<3,T>({ a(1)*b(2)-a(2)*b(1), a(2)*b(0)-a(0)*b(2), a(0)*b(1)-a(1)*b(0) });
:info:build       |            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
:info:build /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_math_ngsolve/ngsolve/work/ngsolve-6.2.2307/basiclinalg/vector.hpp:661:12: note: candidate: 'ngbla::Vec<S, T>::Vec(const TELEM&) [with int S = 3; T = ngcore::SIMD<double, 2>; TELEM = ngcore::SIMD<double, 2>]'
:info:build   661 |     INLINE Vec (const TELEM & scal)
:info:build       |            ^~~
:info:build /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_math_ngsolve/ngsolve/work/ngsolve-6.2.2307/basiclinalg/vector.hpp:654:5: note: candidate: 'constexpr ngbla::Vec<S, T>::Vec(const ngbla::Vec<S, T>&) [with int S = 3; T = ngcore::SIMD<double, 2>]'
:info:build   654 |     Vec (const Vec &) = default;
:info:build       |     ^~~
:info:build In file included from /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_math_ngsolve/ngsolve/work/ngsolve-6.2.2307/basiclinalg/bla.hpp:11,
:info:build                  from /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_math_ngsolve/ngsolve/work/ngsolve-6.2.2307/fem/fem.hpp:14,
:info:build                  from /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_math_ngsolve/ngsolve/work/ngsolve-6.2.2307/fem/diffop_hesse.cpp:1:
:info:build /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_math_ngsolve/ngsolve/work/ngsolve-6.2.2307/basiclinalg/vector.hpp: In instantiation of 'auto ngbla::Cross(const TA&, const TB&) [with TA = Vec<3, ngcore::SIMD<double, 2> >; TB = Vec<3, ngcore::SIMD<double, 2> >; typename std::enable_if<(ConstVecSize<T>::VSIZE == 3), bool>::type <anonymous> = true; typename std::enable_if<(ConstVecSize<TB>::VSIZE == 3), bool>::type <anonymous> = true]':
:info:build /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_math_ngsolve/ngsolve/work/ngsolve-6.2.2307/fem/intrule.hpp:1861:37:   required from here
:info:build /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_math_ngsolve/ngsolve/work/ngsolve-6.2.2307/basiclinalg/vector.hpp:874:12: error: call of overloaded 'Vec(<brace-enclosed initializer list>)' is ambiguous
:info:build   874 |     return Vec<3,T>({ a(1)*b(2)-a(2)*b(1), a(2)*b(0)-a(0)*b(2), a(0)*b(1)-a(1)*b(0) });
:info:build       |            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
:info:build /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_math_ngsolve/ngsolve/work/ngsolve-6.2.2307/basiclinalg/vector.hpp:661:12: note: candidate: 'ngbla::Vec<S, T>::Vec(const TELEM&) [with int S = 3; T = ngcore::SIMD<double, 2>; TELEM = ngcore::SIMD<double, 2>]'
:info:build   661 |     INLINE Vec (const TELEM & scal)
:info:build       |            ^~~
:info:build /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_math_ngsolve/ngsolve/work/ngsolve-6.2.2307/basiclinalg/vector.hpp:654:5: note: candidate: 'constexpr ngbla::Vec<S, T>::Vec(const ngbla::Vec<S, T>&) [with int S = 3; T = ngcore::SIMD<double, 2>]'
:info:build   654 |     Vec (const Vec &) = default;
:info:build       |     ^~~
:info:build [ 20%] Building CXX object linalg/CMakeFiles/ngla.dir/basevector.cpp.o
:info:build cd /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_math_ngsolve/ngsolve/work/build/linalg && /opt/local/bin/g++-mp-13 -DHAVE_CXA_DEMANGLE -DHAVE_DLFCN_H -DHAVE_NETGEN_SOURCES -DLAPACK -DMSG_NOSIGNAL=0 -DNETGEN_PYTHON -DNGS_PYTHON -DNG_PYTHON -DPYBIND11_SIMPLE_GIL_MANAGEMENT -DTCL -DUSE_TIMEOFDAY -DUSE_UMFPACK -Dngla_EXPORTS -I/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_math_ngsolve/ngsolve/work/ngsolve-6.2.2307/linalg -I/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_math_ngsolve/ngsolve/work/ngsolve-6.2.2307/ngscuda -I/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_math_ngsolve/ngsolve/work/ngsolve-6.2.2307/solve -I/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_math_ngsolve/ngsolve/work/ngsolve-6.2.2307/parallel -I/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_math_ngsolve/ngsolve/work/ngsolve-6.2.2307/comp -I/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_math_ngsolve/ngsolve/work/ngsolve-6.2.2307/fem -I/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_math_ngsolve/ngsolve/work/ngsolve-6.2.2307/basiclinalg -I/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_math_ngsolve/ngsolve/work/ngsolve-6.2.2307/ngstd -I/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_math_ngsolve/ngsolve/work/ngsolve-6.2.2307/include -I/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_math_ngsolve/ngsolve/work/build -I/opt/local/Library/Frameworks/Python.framework/Versions/3.11/include/python3.11 -isystem /opt/local/include/include -isystem /opt/local/include -pipe -Os -DNDEBUG -I/opt/local/include -D_GLIBCXX_USE_CXX11_ABI=0 -arch ppc -mmacosx-version-min=10.6 -fPIC -std=c++17 -DMAX_SYS_DIM=3 -std=gnu++17 -MD -MT linalg/CMakeFiles/ngla.dir/basevector.cpp.o -MF CMakeFiles/ngla.dir/basevector.cpp.o.d -o CMakeFiles/ngla.dir/basevector.cpp.o -c /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_math_ngsolve/ngsolve/work/ngsolve-6.2.2307/linalg/basevector.cpp
:info:build make[2]: *** [fem/CMakeFiles/ngfem.dir/diffop_hesse.cpp.o] Error 1

[pinskia]

This might not be a GCC issue. See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=60027 and https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109247 . The C++ standard has defect reports in this area even.

[barracuda156]

@pinskia Indeed, and with Clang it fails earlier, but with similar errors: #69

UPD. But no error with gcc-12. Build is still running, but it is well past the point where gcc-13 erred out.

UPD2. Clang-17 builds it fine too. So Xcode clang-15 fails, gcc-13 fails, LLVM clang-17 works, gcc-12 provisionally works.

[barracuda156]

@pinskia FWIW, fails with gcc 14.2.0 and gcc 15.0.1 (snapshot) as well.