[Bug 2052929]

[Rguenth]

The question is whether the caller misbehaves according to the ABI here?  There's likely a known alignment present we could re-instantiate with a
__builtin_assume_aligned?

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https://bugs.launchpad.net/bugs/2052929

Title:
  failed autopkgtests for evolver vs glibc 2.39 on amd64

Status in gcc:
  In Progress
Status in evolver package in Ubuntu:
  New
Status in gcc-13 package in Ubuntu:
  Fix Released
Status in gcc-14 package in Ubuntu:
  Fix Released
Status in glibc package in Ubuntu:
  Invalid
Status in evolver package in Debian:
  New

Bug description:
  The autopkgests for evolver fail when run against glibc 2.39 on amd64
  with a segfault:

  3537s autopkgtest [09:43:29]: test command6: [-----------------------
  3537s Surface Evolver Version 2.70a (Debian 2.70+ds-8build1), August 27, 2013, 64-bit.
  3537s Compiled for float128, 33 digits precision.
  3537s Built with Geomview support.
  3537s 
  3537s Enter command: 
  3537s Enter command: // Typical evolution to sphere
  3537s Enter command: gogo := { g 5; r; g 5; hessian; r; g 5; hessian; }
  3537s Enter command: 
  3537s Enter command: // Evolution to very high accuracy, using higher-order Lagrange elements.
  3537s Enter command: // To be run on original datafile.
  3537s Enter command: gogo2 := { g 5; r; g 5; hessian; r; g 5; hessian;
  3537s more>            lagrange 2; g 5; hessian; 
  3537s more>            lagrange 4; g 5; hessian; 
  3537s more>            lagrange 6; g 5; hessian; 
  3537s more>            ideal_rad := (3*body[1].volume/4/pi)^(1/3);
  3537s more>            printf "Area error: %g\n",total_area - 4*pi*ideal_rad^2;
  3537s more>            printf "Vertex radius spread: %g\n",
  3537s more>              max(vertex,sqrt((x-.5)^2+(y-.5)^2+(z-.5)^2))
  3537s more>                - min(vertex,sqrt((x-.5)^2+(y-.5)^2+(z-.5)^2));
  3537s more> }
  3537s Enter command: g 5; v; r ; g 10; v;
  3537s bash: line 1:  1012 Done                    echo "g 5; v; r ; g 10; v;"
  3537s       1013 Segmentation fault      (core dumped) | evolver-nox-q cube

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