[MacPorts] #69436: libjxl fails on 10.6 Snow Leopard - onstexpr function never produces a constant expression [-Winvalid-constexpr]

[MacPorts]

#69436: libjxl fails on 10.6 Snow Leopard - onstexpr function never produces a
constant expression [-Winvalid-constexpr]
--------------------------+--------------------
 Reporter:  rmottola      |      Owner:  (none)
     Type:  defect        |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:
 Keywords:  snow leopard  |       Port:  libjxl
--------------------------+--------------------
 Build dies with:


 {{{
 In file included from
 /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_graphics_libjxl/libjxl/work/libjxl-0.10.1/lib/jxl/dec_cache.h:26:
 /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_graphics_libjxl/libjxl/work/libjxl-0.10.1/lib/jxl/coeff_order.h:33:42:
 error: constexpr function never produces a constant expression [-Winvalid-
 constexpr]
 static JXL_MAYBE_UNUSED constexpr size_t CoeffOrderOffset(size_t order,
                                          ^
 /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_graphics_libjxl/libjxl/work/libjxl-0.10.1/lib/jxl/coeff_order.h:35:10:
 note: non-constexpr function 'operator[]' cannot be used in a constant
 expression
   return kCoeffOrderOffset[3 * order + c] * kDCTBlockSize;
          ^
 /opt/local/libexec/llvm-11/bin/../include/c++/v1/array:204:21: note:
 declared here
     const_reference operator[](size_type __n) const _NOEXCEPT {
                     ^
 [ 20%] Building CXX object lib/CMakeFiles/jxl_extras_core-
 obj.dir/extras/dec/pnm.cc.o

 }}}

 Build is with clang 11

-- 
Ticket URL: <https://trac.macports.org/ticket/69436>
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