From 0a2d0574bba6d7e05523d0a6fe8283b798e26584 Mon Sep 17 00:00:00 2001
From: Roland Haas <rhaas@illinois.edu>
Date: Fri, 6 Dec 2024 09:42:01 -0600
Subject: [PATCH] CarpetX: avoid varsize array

---
 CarpetX/src/io_openpmd.cxx | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/CarpetX/src/io_openpmd.cxx b/CarpetX/src/io_openpmd.cxx
index 04f91c545..fdfcd0810 100644
--- a/CarpetX/src/io_openpmd.cxx
+++ b/CarpetX/src/io_openpmd.cxx
@@ -1206,8 +1206,8 @@ void carpetx_openpmd_t::InputOpenPMD(const cGH *const cctkGH,
                 constexpr std::uint64_t ipoison =
                     0xfff8000000000000ULL + 0xdeadbeef;
 #endif
-                char poison[CCTK_VarTypeSize(cgroup.vartype)];
-                std::memcpy(&poison, &ipoison, sizeof(poison));
+                std::vector<char> poison(CCTK_VarTypeSize(cgroup.vartype));
+                std::memcpy(poison.data(), &ipoison, poison.size());
                 for (int k = extbox.lo[2]; k < extbox.hi[2]; ++k) {
                   for (int j = extbox.lo[1]; j < extbox.hi[1]; ++j) {
                     for (int i = extbox.lo[0]; i < extbox.hi[0]; ++i) {
@@ -1216,7 +1216,7 @@ void carpetx_openpmd_t::InputOpenPMD(const cGH *const cctkGH,
                         memcpy(cactus_ptr->data_at(cactus_di * i +
                                                    cactus_dj * j +
                                                    cactus_dk * k),
-                               poison, sizeof(poison));
+                               poison.data(), poison.size());
                     }
                   }
                 }