external: add cmake finder for CHOLMOD

find-external/CHOLMOD/findCHOLMOD.cmake

@@ -0,0 +1,112 @@
+# This file has been imported from Eigen. See
+# https://gitlab.com/libeigen/eigen/-/blob/master/cmake/FindCHOLMOD.cmake It has
+# been then adapted by Justin Carpentier <[email protected]> to comply
+# with the API of the JRL CMake module.
+
+# CHOLMOD lib usually requires linking to a blas and lapack library. It is up to
+# the user of this module to find a BLAS and link to it.
+
+if(CHOLMOD_INCLUDES AND CHOLMOD_LIBRARIES)
+  set(CHOLMOD_FIND_QUIETLY TRUE)
+endif()
+
+find_path(
+  CHOLMOD_INCLUDES
+  NAMES cholmod.h
+  PATHS $ENV{CHOLMODDIR} ${INCLUDE_INSTALL_DIR}
+  PATH_SUFFIXES suitesparse ufsparse)
+
+find_library(CHOLMOD_LIBRARIES cholmod PATHS $ENV{CHOLMODDIR}
+                                             ${LIB_INSTALL_DIR})
+
+if(CHOLMOD_LIBRARIES)
+
+  get_filename_component(CHOLMOD_LIBDIR ${CHOLMOD_LIBRARIES} PATH)
+
+  find_library(AMD_LIBRARY amd PATHS ${CHOLMOD_LIBDIR} $ENV{CHOLMODDIR}
+                                     ${LIB_INSTALL_DIR})
+  if(AMD_LIBRARY)
+    set(CHOLMOD_LIBRARIES ${CHOLMOD_LIBRARIES} ${AMD_LIBRARY})
+  else()
+    set(CHOLMOD_LIBRARIES FALSE)
+  endif()
+
+endif()
+
+if(CHOLMOD_LIBRARIES)
+
+  find_library(COLAMD_LIBRARY colamd PATHS ${CHOLMOD_LIBDIR} $ENV{CHOLMODDIR}
+                                           ${LIB_INSTALL_DIR})
+  if(COLAMD_LIBRARY)
+    set(CHOLMOD_LIBRARIES ${CHOLMOD_LIBRARIES} ${COLAMD_LIBRARY})
+  else()
+    set(CHOLMOD_LIBRARIES FALSE)
+  endif()
+
+endif()
+
+if(CHOLMOD_LIBRARIES)
+
+  find_library(CAMD_LIBRARY camd PATHS ${CHOLMOD_LIBDIR} $ENV{CHOLMODDIR}
+                                       ${LIB_INSTALL_DIR})
+  if(CAMD_LIBRARY)
+    set(CHOLMOD_LIBRARIES ${CHOLMOD_LIBRARIES} ${CAMD_LIBRARY})
+  else()
+    set(CHOLMOD_LIBRARIES FALSE)
+  endif()
+
+endif()
+
+if(CHOLMOD_LIBRARIES)
+
+  find_library(CCOLAMD_LIBRARY ccolamd PATHS ${CHOLMOD_LIBDIR} $ENV{CHOLMODDIR}
+                                             ${LIB_INSTALL_DIR})
+  if(CCOLAMD_LIBRARY)
+    set(CHOLMOD_LIBRARIES ${CHOLMOD_LIBRARIES} ${CCOLAMD_LIBRARY})
+  else()
+    set(CHOLMOD_LIBRARIES FALSE)
+  endif()
+
+endif()
+
+if(CHOLMOD_LIBRARIES)
+
+  find_library(CHOLMOD_METIS_LIBRARY metis
+               PATHS ${CHOLMOD_LIBDIR} $ENV{CHOLMODDIR} ${LIB_INSTALL_DIR})
+  if(CHOLMOD_METIS_LIBRARY)
+    set(CHOLMOD_LIBRARIES ${CHOLMOD_LIBRARIES} ${CHOLMOD_METIS_LIBRARY})
+  endif()
+
+endif()
+
+if(CHOLMOD_LIBRARIES)
+
+  find_library(SUITESPARSE_LIBRARY SuiteSparse
+               PATHS ${CHOLMOD_LIBDIR} $ENV{CHOLMODDIR} ${LIB_INSTALL_DIR})
+  if(SUITESPARSE_LIBRARY)
+    set(CHOLMOD_LIBRARIES ${CHOLMOD_LIBRARIES} ${SUITESPARSE_LIBRARY})
+  endif()
+
+endif()
+
+if(CHOLMOD_LIBRARIES)
+  add_library(SuiteSparse::CHOLMOD SHARED IMPORTED)
+  set_target_properties(
+    SuiteSparse::CHOLMOD
+    PROPERTIES IMPORTED_LOCATION ${CHOLMOD_LIBRARIES}
+               INTERFACE_INCLUDE_DIRECTORIES "${CHOLMOD_INCLUDES}")
+endif(CHOLMOD_LIBRARIES)
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(CHOLMOD DEFAULT_MSG CHOLMOD_INCLUDES
+                                  CHOLMOD_LIBRARIES)
+
+mark_as_advanced(
+  CHOLMOD_INCLUDES
+  CHOLMOD_LIBRARIES
+  AMD_LIBRARY
+  COLAMD_LIBRARY
+  SUITESPARSE_LIBRARY
+  CAMD_LIBRARY
+  CCOLAMD_LIBRARY
+  CHOLMOD_METIS_LIBRARY)