From 8dcc8102d3cbfb43311ee96f43995efcdcb42c5d Mon Sep 17 00:00:00 2001
From: Timo Heister <timo.heister@gmail.com>
Date: Sun, 15 May 2022 11:56:42 -0400
Subject: [PATCH] new global option: USE_64_BIT_INDICES

---
 candi.cfg                                 | 3 +++
 deal.II-toolchain/packages/dealii.package | 5 +++++
 deal.II-toolchain/packages/petsc.package  | 9 ++++++++-
 3 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/candi.cfg b/candi.cfg
index 321dab3..bb5a80b 100644
--- a/candi.cfg
+++ b/candi.cfg
@@ -33,6 +33,9 @@ DEAL_II_CONFOPTS=""
 # Option {ON|OFF}: Enable machine-specific optimizations (e.g. -march=native)?
 NATIVE_OPTIMIZATIONS=OFF
 
+# Option {ON|OFF}: Enable 64-bit indices for large computations?
+USE_64_BIT_INDICES=OFF
+
 # Option {ON|OFF}: Enable building of dealii examples?
 BUILD_EXAMPLES=ON
 
diff --git a/deal.II-toolchain/packages/dealii.package b/deal.II-toolchain/packages/dealii.package
index fc96fa4..9be7da7 100644
--- a/deal.II-toolchain/packages/dealii.package
+++ b/deal.II-toolchain/packages/dealii.package
@@ -42,6 +42,11 @@ if [ ${NATIVE_OPTIMIZATIONS} = ON ]; then
       -D CMAKE_CXX_FLAGS_RELEASE='-O3'"
 fi
 
+if [ ${USE_64_BIT_INDICES} = ON ]; then
+    CONFOPTS="${CONFOPTS} \
+      -D DEAL_II_WITH_64BIT_INDICES=ON"
+fi
+
 if [ ${USE_DEAL_II_CMAKE_MPI_COMPILER} = ON ]; then
     # Disable CXX, CC for deal.II as recommended in
     # https://github.com/dealii/dealii/issues/11478 and set MPI_*_COMPILER
diff --git a/deal.II-toolchain/packages/petsc.package b/deal.II-toolchain/packages/petsc.package
index b594ee2..bdcd5cb 100644
--- a/deal.II-toolchain/packages/petsc.package
+++ b/deal.II-toolchain/packages/petsc.package
@@ -29,12 +29,19 @@ INSTALL_PATH=${INSTALL_PATH}/${EXTRACTSTO}
 
 ################################################################################
 
+with64bit=0
+if [ ${USE_64_BIT_INDICES} = ON ]; then
+    with64bit=1
+else
+    with64bit=0
+fi
+
 CONFOPTS="\
   --with-debugging=0 \
   --with-shared-libraries=1 \
   --with-mpi=1 \
   --with-x=0 \
-  --with-64-bit-indices=0"
+  --with-64-bit-indices=$(with64bit}"
 
 if [ ${NATIVE_OPTIMIZATIONS} = ON ]; then
     CONFOPTS="${CONFOPTS} \
-- 
2.39.5