From a041d8da8109716590fc571e57a315af9865e742 Mon Sep 17 00:00:00 2001
From: Timo Heister <timo.heister@gmail.com>
Date: Thu, 1 Jul 2021 16:10:20 -0400
Subject: [PATCH] Trilinos: add complex option

Trilinos complex support is not needed in deal.II, unless complex Tpetra
vectors are used (unlikely). Enabling it requires large amounts of RAM
(we are talking 10GB per process). Instead, introduce an option that
defaults to OFF.
Also see https://github.com/dealii/dealii/pull/8945
fixes #219
---
 candi.cfg                                   |  5 +++++
 deal.II-toolchain/packages/trilinos.package | 19 ++++++++++++-------
 2 files changed, 17 insertions(+), 7 deletions(-)

diff --git a/candi.cfg b/candi.cfg
index 99d66e4..3a5dd33 100644
--- a/candi.cfg
+++ b/candi.cfg
@@ -98,6 +98,11 @@ TRILINOS_MAJOR_VERSION=AUTO
 #TRILINOS_MAJOR_VERSION=12
 #TRILINOS_MAJOR_VERSION=11
 
+# If enabled, Trilinos is configured with complex number support in
+# Teuchos and Tpetra. This takes a long time to compile and requires a
+# lot of RAM. It is also likely not something you will need.
+TRILINOS_WITH_COMPLEX=OFF
+
 #########################################################################
 
 # Option {ON|OFF}: Do you want to use MKL?
diff --git a/deal.II-toolchain/packages/trilinos.package b/deal.II-toolchain/packages/trilinos.package
index 0c20895..4da7326 100644
--- a/deal.II-toolchain/packages/trilinos.package
+++ b/deal.II-toolchain/packages/trilinos.package
@@ -183,16 +183,10 @@ CONFOPTS="\
   -D Trilinos_ENABLE_Ifpack:BOOL=ON \
   -D Trilinos_ENABLE_Ifpack2:BOOL=OFF \
   -D Trilinos_ENABLE_Tpetra:BOOL=ON \
-  -D   Tpetra_INST_DOUBLE:BOOL=ON \
   -D   Tpetra_INST_INT_LONG:BOOL=ON \
-  -D   Tpetra_INST_COMPLEX_DOUBLE:BOOL=ON \
-  -D   Tpetra_INST_COMPLEX_FLOAT:BOOL=ON \
-  -D   Tpetra_INST_FLOAT:BOOL=ON \
-  -D   Tpetra_INST_SERIAL:BOOL=ON \
   -D Trilinos_ENABLE_AztecOO:BOOL=ON \
   -D Trilinos_ENABLE_Sacado:BOOL=ON \
   -D Trilinos_ENABLE_Teuchos:BOOL=ON \
-  -D   Teuchos_ENABLE_COMPLEX:BOOL=ON \
   -D   Teuchos_ENABLE_FLOAT:BOOL=ON \
   -D Trilinos_ENABLE_MueLu:BOOL=ON \
   -D Trilinos_ENABLE_ML:BOOL=ON \
@@ -205,7 +199,18 @@ CONFOPTS="\
   -D CMAKE_BUILD_TYPE:STRING=RELEASE \
   -D CMAKE_VERBOSE_MAKEFILE:BOOL=OFF \
   -D BUILD_SHARED_LIBS:BOOL=ON \
-  ${CONFOPTS} \
+  ${CONFOPTS}"
+
+if [ ${TRILINOS_WITH_COMPLEX} = ON ]; then
+    CONFOPTS="\
+    -D Trilinos_ENABLE_COMPLEX_DOUBLE=ON \
+    -D Trilinos_ENABLE_COMPLEX_FLOAT=ON \
+    -D Teuchos_ENABLE_COMPLEX:BOOL=ON \
+    ${CONFOPTS}"
+fi
+
+# finally append user options:
+CONFOPTS="${CONFOPTS} \
   ${TRILINOS_CONFOPTS}"
 
 package_specific_register () {
-- 
2.39.5