From 2848e4f51424ad3a97c76400650f5974e4919662 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Markus=20M=C3=BCtzel?= <markus.muetzel@gmx.de>
Date: Thu, 19 Oct 2023 16:15:55 +0200
Subject: [PATCH] SPQR/SPQR_CUDA: Automatically check for dependencies when
 importing target

---
 SPQR/CMakeLists.txt                  |  4 ++--
 SPQR/Config/SPQRConfig.cmake.in      | 36 ++++++++++++++++++++++++++++
 SPQR/Config/SPQR_CUDAConfig.cmake.in | 22 +++++++++++++++++
 SPQR/SPQRGPU/CMakeLists.txt          |  9 +++++++
 4 files changed, 69 insertions(+), 2 deletions(-)

diff --git a/SPQR/CMakeLists.txt b/SPQR/CMakeLists.txt
index c1f8f6fbe..a11705444 100644
--- a/SPQR/CMakeLists.txt
+++ b/SPQR/CMakeLists.txt
@@ -264,14 +264,14 @@ install ( EXPORT SPQRTargets
     DESTINATION ${SUITESPARSE_LIBDIR}/cmake/SPQR )
 
 # generate config file to be used in common build tree
-set ( SUITESPARSE_IN_BUILD_TREE on )
+set ( SUITESPARSE_IN_BUILD_TREE ON )
 configure_package_config_file (
     Config/SPQRConfig.cmake.in
     ${CMAKE_CURRENT_BINARY_DIR}/SPQRConfig.cmake
     INSTALL_DESTINATION ${CMAKE_CURRENT_BINARY_DIR}/SPQRConfig.cmake )
 
 # generate config file to be installed
-set ( SUITESPARSE_IN_BUILD_TREE off )
+set ( SUITESPARSE_IN_BUILD_TREE OFF )
 configure_package_config_file (
     Config/SPQRConfig.cmake.in
     ${CMAKE_CURRENT_BINARY_DIR}/target/SPQRConfig.cmake
diff --git a/SPQR/Config/SPQRConfig.cmake.in b/SPQR/Config/SPQRConfig.cmake.in
index d75acac3d..7f73ad048 100644
--- a/SPQR/Config/SPQRConfig.cmake.in
+++ b/SPQR/Config/SPQRConfig.cmake.in
@@ -37,8 +37,44 @@ set ( SPQR_VERSION "@SPQR_VERSION_MAJOR@.@SPQR_VERSION_MINOR@.@SPQR_VERSION_SUB@
 
 # Check for dependent targets
 include ( CMakeFindDependencyMacro )
+
 set ( _dependencies_found ON )
 
+# Look for SuiteSparse_config and CHOLMOD targets
+if ( @SUITESPARSE_IN_BUILD_TREE@ )
+    if ( NOT TARGET SuiteSparse::SuiteSparseConfig )
+        # First check in a common build tree
+        find_dependency ( SuiteSparse_config @SUITESPARSE_CONFIG_VERSION_MAJOR@.@SUITESPARSE_CONFIG_VERSION_MINOR@
+            PATHS ${CMAKE_SOURCE_DIR}/../SuiteSparse_config/build NO_DEFAULT_PATH )
+        # Then, check in the currently active CMAKE_MODULE_PATH
+        if ( NOT SuiteSparse_config_FOUND )
+            find_dependency ( SuiteSparse_config @SUITESPARSE_CONFIG_VERSION_MAJOR@.@SUITESPARSE_CONFIG_VERSION_MINOR@ )
+        endif ( )
+    endif ( )
+
+    if ( NOT TARGET SuiteSparse::CHOLMOD )
+        # First check in a common build tree
+        find_dependency ( CHOLMOD @CHOLMOD_VERSION_MAJOR@.@CHOLMOD_VERSION_MINOR@
+            PATHS ${CMAKE_SOURCE_DIR}/../CHOLMOD/build NO_DEFAULT_PATH )
+        # Then, check in the currently active CMAKE_MODULE_PATH
+        if ( NOT CHOLMOD_FOUND )
+            find_dependency ( CHOLMOD @CHOLMOD_VERSION_MAJOR@.@CHOLMOD_VERSION_MINOR@ )
+        endif ( )
+    endif ( )
+
+else ( )
+    if ( NOT TARGET SuiteSparse::SuiteSparseConfig )
+        find_dependency ( SuiteSparse_config @SUITESPARSE_CONFIG_VERSION_MAJOR@.@SUITESPARSE_CONFIG_VERSION_MINOR@ )
+    endif ( )
+    if ( NOT TARGET SuiteSparse::CHOLMOD )
+        find_dependency ( CHOLMOD @CHOLMOD_VERSION_MAJOR@.@CHOLMOD_VERSION_MINOR@ )
+    endif ( )
+endif ( )
+
+if ( NOT SuiteSparse_config_FOUND OR NOT CHOLMOD_FOUND )
+    set ( _dependencies_found OFF )
+endif ( )
+
 if ( @SUITESPARSE_CUDA@ )
     # Look for imported targets of additional dependency if SPQR was built with CUDA
 
diff --git a/SPQR/Config/SPQR_CUDAConfig.cmake.in b/SPQR/Config/SPQR_CUDAConfig.cmake.in
index 83297a234..99e431706 100644
--- a/SPQR/Config/SPQR_CUDAConfig.cmake.in
+++ b/SPQR/Config/SPQR_CUDAConfig.cmake.in
@@ -38,6 +38,28 @@ set ( SPQR_CUDA_VERSION "@SPQR_VERSION_MAJOR@.@SPQR_VERSION_MINOR@.@SPQR_VERSION
 include ( CMakeFindDependencyMacro )
 set ( _dependencies_found ON )
 
+# Look for CHOLMOD target
+if ( @SUITESPARSE_IN_BUILD_TREE@ )
+    if ( NOT TARGET SuiteSparse::CHOLMOD )
+        # First check in a common build tree
+        find_dependency ( CHOLMOD @CHOLMOD_VERSION_MAJOR@.@CHOLMOD_VERSION_MINOR@
+            PATHS ${CMAKE_SOURCE_DIR}/../CHOLMOD/build NO_DEFAULT_PATH )
+        # Then, check in the currently active CMAKE_MODULE_PATH
+        if ( NOT CHOLMOD_FOUND )
+            find_dependency ( CHOLMOD @CHOLMOD_VERSION_MAJOR@.@CHOLMOD_VERSION_MINOR@ )
+        endif ( )
+    endif ( )
+
+else ( )
+    if ( NOT TARGET SuiteSparse::CHOLMOD )
+        find_dependency ( CHOLMOD @CHOLMOD_VERSION_MAJOR@.@CHOLMOD_VERSION_MINOR@ )
+    endif ( )
+endif ( )
+
+if ( NOT CHOLMOD_FOUND )
+    set ( _dependencies_found OFF )
+endif ( )
+
 # Look for NVIDIA CUDA toolkit
 if ( NOT CUDAToolkit_FOUND )
     find_dependency ( CUDAToolkit @CUDAToolkit_VERSION_MAJOR@ )
diff --git a/SPQR/SPQRGPU/CMakeLists.txt b/SPQR/SPQRGPU/CMakeLists.txt
index b63a4ef8a..f41e49be4 100644
--- a/SPQR/SPQRGPU/CMakeLists.txt
+++ b/SPQR/SPQRGPU/CMakeLists.txt
@@ -127,9 +127,18 @@ install ( EXPORT SPQR_CUDATargets
     NAMESPACE SuiteSparse::
     DESTINATION ${SUITESPARSE_LIBDIR}/cmake/SPQR_CUDA )
 
+# generate config file to be used in common build tree
+set ( SUITESPARSE_IN_BUILD_TREE ON )
 configure_package_config_file (
     ../Config/SPQR_CUDAConfig.cmake.in
     ${CMAKE_CURRENT_BINARY_DIR}/../SPQR_CUDAConfig.cmake
+    INSTALL_DESTINATION ${CMAKE_CURRENT_BINARY_DIR}/../SPQR_CUDAConfig.cmake )
+
+# generate config file to be installed
+set ( SUITESPARSE_IN_BUILD_TREE OFF )
+configure_package_config_file (
+    ../Config/SPQR_CUDAConfig.cmake.in
+    ${CMAKE_CURRENT_BINARY_DIR}/../target/SPQR_CUDAConfig.cmake
     INSTALL_DESTINATION ${SUITESPARSE_LIBDIR}/cmake/SPQR_CUDA )
 
 write_basic_package_version_file (