From c15a5be65d934798c166a8d6d79d7cc4fa1ce9a5 Mon Sep 17 00:00:00 2001
From: Steven Roberts <roberts115@llnl.gov>
Date: Thu, 26 Jun 2025 18:33:53 -0700
Subject: [PATCH 1/2] Update to SUNDIALS 7.4.0

---
 CMakeLists.txt | 2 +-
 README.md      | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7428b0468..64c924fba 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -92,7 +92,7 @@ if(GRIDKIT_ENABLE_IPOPT)
   enable_language(Fortran) # Needed for linking to HSL
 endif()
 if(GRIDKIT_ENABLE_SUNDIALS)
-  find_package(SUNDIALS 7.0.0 REQUIRED CONFIG
+  find_package(SUNDIALS 7.4.0 REQUIRED CONFIG
                PATHS ${SUNDIALS_DIR}
                      ${SUNDIALS_DIR}/lib/cmake/sundials)
   message(STATUS "SUNDIALS configuration found: ${SUNDIALS_CONFIG}")
diff --git a/README.md b/README.md
index 087e4a145..b899f8927 100644
--- a/README.md
+++ b/README.md
@@ -18,7 +18,7 @@ Before installing GridKit™ make sure you have all needed dependencies.
 ### Dependencies
 You should have all of the following installed before installing GridKit™
 - A version of
-    - [SUNDIALS](https://github.com/LLNL/sundials) `develop` branch at commit >= [`07d21c2`](https://github.com/LLNL/sundials/commit/07d21c2c5ae33211a9a2fafd8eac56de5582dce0)
+    - [SUNDIALS](https://github.com/LLNL/sundials) >= 7.4.0
     - [Suitesparse](https://github.com/DrTimothyAldenDavis/SuiteSparse) >= 5.x (optional)
         - If using Suitesparse, SUNDIALS must also be built with [KLU support](https://sundials.readthedocs.io/en/latest/sundials/Install_link.html#cmakeoption-ENABLE_KLU)
     - [Ipopt](https://github.com/coin-or/Ipopt) >= 3.x (optional)

From cae6a551ee29b790880f8527dfcca54217d93a82 Mon Sep 17 00:00:00 2001
From: Nicholson Koukpaizan <72402802+nkoukpaizan@users.noreply.github.com>
Date: Fri, 27 Jun 2025 17:52:06 -0400
Subject: [PATCH 2/2] Updated Spack fork with sundials@7.4.0 and set CI to use
 that version. (#164)

---
 .github/workflows/spack_default_build.yaml | 2 +-
 buildsystem/spack/spack                    | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/.github/workflows/spack_default_build.yaml b/.github/workflows/spack_default_build.yaml
index e0a09e4b2..60d9144aa 100644
--- a/.github/workflows/spack_default_build.yaml
+++ b/.github/workflows/spack_default_build.yaml
@@ -142,7 +142,7 @@ jobs:
               mumps:
                 require: ~mpi~openmp
               sundials:
-                require: '@develop'
+                require: '@7.4.0'
               llvm:
                 externals:
                 - spec: llvm@${{ matrix.llvm }}
diff --git a/buildsystem/spack/spack b/buildsystem/spack/spack
index 4c05697f7..ba17e3f5f 160000
--- a/buildsystem/spack/spack
+++ b/buildsystem/spack/spack
@@ -1 +1 @@
-Subproject commit 4c05697f7518269c4fd8bdb9d85cb4d124c60d01
+Subproject commit ba17e3f5fde40fd3012f41929712b2d877c8cf56