From f94a745a10d9dde0c5c1c28a5f1770fe63802f22 Mon Sep 17 00:00:00 2001
From: David Wells <drwells@email.unc.edu>
Date: Thu, 3 Sep 2020 12:58:01 -0400
Subject: [PATCH] Check for SEACAS support.

We need it for ExodusII.
---
 cmake/configure/configure_2_trilinos.cmake | 39 +++++++++++++++++++++-
 doc/external-libs/trilinos.html            |  2 ++
 include/deal.II/base/config.h.in           |  3 +-
 3 files changed, 42 insertions(+), 2 deletions(-)

diff --git a/cmake/configure/configure_2_trilinos.cmake b/cmake/configure/configure_2_trilinos.cmake
index fc65b84a10..b6a8d7463d 100644
--- a/cmake/configure/configure_2_trilinos.cmake
+++ b/cmake/configure/configure_2_trilinos.cmake
@@ -171,7 +171,7 @@ MACRO(FEATURE_TRILINOS_FIND_EXTERNAL var)
       #
       # Check for modules.
       #
-      FOREACH(_optional_module EpetraExt ROL Sacado Tpetra MueLu Zoltan)
+      FOREACH(_optional_module EpetraExt MueLu ROL Sacado SEACAS Tpetra Zoltan)
         ITEM_MATCHES(_module_found ${_optional_module} ${Trilinos_PACKAGE_LIST})
         IF(_module_found)
           MESSAGE(STATUS "Found ${_optional_module}")
@@ -281,6 +281,43 @@ MACRO(FEATURE_TRILINOS_FIND_EXTERNAL var)
       ENDIF()
     ENDIF()
 
+    # the only thing we use from SEACAS right now is ExodusII, so just check
+    # that it works
+    IF(${DEAL_II_TRILINOS_WITH_SEACAS})
+      LIST(APPEND CMAKE_REQUIRED_INCLUDES ${Trilinos_INCLUDE_DIRS})
+      LIST(APPEND CMAKE_REQUIRED_LIBRARIES ${Trilinos_LIBRARIES})
+      CHECK_CXX_SOURCE_COMPILES(
+        "
+        #include <exodusII.h>
+        int
+        main()
+        {
+          int component_word_size = sizeof(double);
+          int floating_point_word_size = 0;
+          float ex_version = 0;
+          const int ex_id = ex_open(\"test.ex\",
+                                    EX_READ,
+                                    &component_word_size,
+                                    &floating_point_word_size,
+                                    &ex_version);
+          ex_close(ex_id);
+          return 0;
+        }
+        "
+        TRILINOS_SEACAS_IS_FUNCTIONAL
+        )
+
+      RESET_CMAKE_REQUIRED()
+
+      IF(NOT TRILINOS_SEACAS_IS_FUNCTIONAL)
+        MESSAGE(
+          STATUS
+          "SEACAS was found but doesn't seem to include ExodusII. Disabling SEACAS support."
+          )
+        SET(DEAL_II_TRILINOS_WITH_SEACAS OFF)
+      ENDIF()
+    ENDIF()
+
     IF(${DEAL_II_TRILINOS_WITH_SACADO})
       #
       # Look for Sacado_config.h - we'll query it to determine C++11 support:
diff --git a/doc/external-libs/trilinos.html b/doc/external-libs/trilinos.html
index 63c6803751..406f877c16 100644
--- a/doc/external-libs/trilinos.html
+++ b/doc/external-libs/trilinos.html
@@ -67,6 +67,7 @@
         <li> MueLu (optional, required for TrilinosWrappers::PreconditionAMGMueLu),
         <li> ROL (optional),
         <li> Sacado (optional),
+        <li> SEACAS (optional, required for GridIn::read_exodusii()),
         <li> Teuchos,
         <li> Tpetra (optional),
         <li> Zoltan (optional).
@@ -90,6 +91,7 @@
     -DTrilinos_ENABLE_Ifpack=ON                      \
     -DTrilinos_ENABLE_AztecOO=ON                     \
     -DTrilinos_ENABLE_Sacado=ON                      \
+    -DTrilinos_ENABLE_SEACAS=ON                      \
     -DTrilinos_ENABLE_Teuchos=ON                     \
     -DTrilinos_ENABLE_MueLu=ON                       \
     -DTrilinos_ENABLE_ML=ON                          \
diff --git a/include/deal.II/base/config.h.in b/include/deal.II/base/config.h.in
index 0c9a16b9f9..d44f6292bc 100644
--- a/include/deal.II/base/config.h.in
+++ b/include/deal.II/base/config.h.in
@@ -205,10 +205,11 @@
 /* cmake/configure/configure_2_trilinos.cmake */
 #cmakedefine DEAL_II_TRILINOS_CXX_SUPPORTS_SACADO_COMPLEX_RAD
 #cmakedefine DEAL_II_TRILINOS_WITH_EPETRAEXT
+#cmakedefine DEAL_II_TRILINOS_WITH_MUELU
 #cmakedefine DEAL_II_TRILINOS_WITH_ROL
 #cmakedefine DEAL_II_TRILINOS_WITH_SACADO
+#cmakedefine DEAL_II_TRILINOS_WITH_SEACAS
 #cmakedefine DEAL_II_TRILINOS_WITH_TPETRA
-#cmakedefine DEAL_II_TRILINOS_WITH_MUELU
 #cmakedefine DEAL_II_TRILINOS_WITH_ZOLTAN
 
 
-- 
2.39.5