From 0d38955a2d01e36f0c5318964230d7230e65ed68 Mon Sep 17 00:00:00 2001
From: sfilippone <filippone.salvatore@gmail.com>
Date: Tue, 7 Apr 2026 16:23:32 +0200
Subject: [PATCH] Fix generation of amg_config.h with CMAKE

---
 CMakeLists.txt           |  7 +++++++
 cmake/readAMGConst.cmake | 14 ++++++++++++++
 2 files changed, 21 insertions(+)
 create mode 100644 cmake/readAMGConst.cmake

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3c53de8f..3c55fb11 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -305,6 +305,13 @@ if(MPI_FOUND)
   #include_directories("${MPI_INCLUDE_DIR}")
 endif()
 
+# Find AMG constants
+include(${CMAKE_CURRENT_LIST_DIR}/cmake/readAMGConst.cmake)
+_amg_read_const()
+
+if ("${PSB_LPK_SIZE}" EQUAL 8) 
+   set(CXXMATCHBOXBIT "#define AMG_MATCHBOXP_BIT64")
+endif()
 
 
 #------------------------------------------
diff --git a/cmake/readAMGConst.cmake b/cmake/readAMGConst.cmake
new file mode 100644
index 00000000..2c60716f
--- /dev/null
+++ b/cmake/readAMGConst.cmake
@@ -0,0 +1,14 @@
+
+macro(_amg_read_const)
+file(READ "${CMAKE_CURRENT_SOURCE_DIR}/amgprec/amg_base_prec_type.F90" _amg_const_mod)
+string(REGEX MATCH "amg_version_major_[ \t]+=[ \t]+([0-9]+)" _amg_version_major_match "${_amg_const_mod}")
+set(AMGMAJOR  "${CMAKE_MATCH_1}")
+string(REGEX MATCH "amg_version_minor_[ \t]+=[ \t]+([0-9]+)" _amg_version_minor_match "${_amg_const_mod}")
+set(AMGMINOR  "${CMAKE_MATCH_1}")
+string(REGEX MATCH "amg_patchlevel_[ \t]+=[ \t]+([0-9]+)" _amg_patchlevel_match "${_amg_const_mod}")
+set(AMGPATCH  "${CMAKE_MATCH_1}")
+string(REGEX MATCH "amg_version_string_[ \t]+=[ \t]+([^ \t]+)" _amg_version_string_match "${_amg_const_mod}")
+set(AMGSTRING  "${CMAKE_MATCH_1}")
+
+endmacro(_amg_read_const)
+