SuiteSparse_config: Link to OpenMP target

CMakeLists.txt

@@ -57,6 +57,9 @@ foreach ( proj ${SUITESPARSE_ENABLE_PROJECTS} )
   endif ( )
 endforeach ( )
 
+# Use OpenMP in CHOLMOD, GraphBLAS, LAGraph, and SuiteSparse_config
+option ( NOPENMP "ON: do not use OpenMP.  OFF (default): use OpenMP" OFF )
+
 # CHOLMOD options affecting dependencies
 option ( NCAMD "ON: do not use CAMD/CCOLAMD.  OFF (default): use CAMD/CCOLAMD" OFF )
 
@@ -96,6 +99,14 @@ set ( CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH}
 
 include ( SuiteSparsePolicy )
 
+if ( NOPENMP )
+    # OpenMP has been disabled
+    message ( STATUS "OpenMP disabled" )
+    set ( OpenMP_C_FOUND OFF )
+else ( )
+    find_package ( OpenMP )
+endif ( )
+
 #-------------------------------------------------------------------------------
 # check/add project dependencies
 #-------------------------------------------------------------------------------

SuiteSparse_config/CMakeLists.txt

@@ -56,11 +56,11 @@ endif ( )
 # find library dependencies
 #-------------------------------------------------------------------------------
 
-option ( NOPENMP "ON: do not use OpenMP.  OFF (default): use OpenMP" off )
+option ( NOPENMP "ON: do not use OpenMP.  OFF (default): use OpenMP" OFF )
 if ( NOPENMP )
     # OpenMP has been disabled
     message ( STATUS "OpenMP disabled" )
-    set ( OPENMP_FOUND false )
+    set ( OpenMP_C_FOUND OFF )
 else ( )
     find_package ( OpenMP )
 endif ( )
@@ -139,18 +139,18 @@ if ( NOT WIN32 )
 endif ( )
 
 # OpenMP:
-if ( OPENMP_FOUND )
+if ( OpenMP_C_FOUND )
     message ( STATUS "OpenMP C libraries:      ${OpenMP_C_LIBRARIES} ")
     message ( STATUS "OpenMP C include:        ${OpenMP_C_INCLUDE_DIRS} ")
     message ( STATUS "OpenMP C flags:          ${OpenMP_C_FLAGS} ")
     if ( BUILD_SHARED_LIBS )
-        target_link_libraries ( SuiteSparseConfig PRIVATE ${OpenMP_C_LIBRARIES} )
+        target_link_libraries ( SuiteSparseConfig PRIVATE OpenMP::OpenMP_C )
+        target_include_directories ( SuiteSparseConfig PUBLIC
+            "$<TARGET_PROPERTY:OpenMP::OpenMP_C,INTERFACE_INCLUDE_DIRECTORIES>" )
     endif ( )
     if ( BUILD_STATIC_LIBS )
-        target_link_libraries ( SuiteSparseConfig_static PUBLIC ${OpenMP_C_LIBRARIES} )
+        target_link_libraries ( SuiteSparseConfig_static PUBLIC OpenMP::OpenMP_C )
     endif ( )
-    set ( CMAKE_C_FLAGS  "${CMAKE_C_FLAGS} ${OpenMP_C_FLAGS} " )
-    include_directories ( ${OpenMP_C_INCLUDE_DIRS} )
 endif ( )
 
 # BLAS:

SuiteSparse_config/Config/SuiteSparse_configConfig.cmake.in

@@ -35,6 +35,25 @@ set ( SUITESPARSE_CONFIG_VERSION_MINOR @SUITESPARSE_VERSION_MINOR@ )
 set ( SUITESPARSE_CONFIG_VERSION_PATCH @SUITESPARSE_VERSION_SUB@ )
 set ( SUITESPARSE_CONFIG_VERSION "@SUITESPARSE_VERSION_MAJOR@.@SUITESPARSE_VERSION_MINOR@.@SUITESPARSE_VERSION_SUB@" )
 
+# Check for dependent targets
+include ( CMakeFindDependencyMacro )
+set ( _dependencies_found ON )
+
+# Look for OpenMP
+message ( STATUS "OpenMP_C_FOUND: ${OpenMP_C_FOUND}" )
+if ( NOT @NOPENMP@ AND NOT OpenMP_C_FOUND )
+    find_dependency ( OpenMP )
+    if ( NOT OpenMP_C_FOUND )
+        set ( _dependencies_found OFF )
+    endif ( )
+endif ( )
+
+if ( NOT _dependencies_found )
+    set ( SuiteSparse_config_FOUND OFF )
+    return ( )
+endif ( )
+
+
 include ( ${CMAKE_CURRENT_LIST_DIR}/SuiteSparse_configTargets.cmake )
 
 # The following is only for backward compatibility with FindSuiteSparse_config.