File: FindCUDNN.cmake

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# Find the CUDNN libraries
#
# The following variables are optionally searched for defaults
#  CUDNN_ROOT: Base directory where CUDNN is found
#  CUDNN_INCLUDE_DIR: Directory where CUDNN header is searched for
#  CUDNN_LIBRARY: Directory where CUDNN library is searched for
#  CUDNN_STATIC: Are we looking for a static library? (default: no)
#
# The following are set after configuration is done:
#  CUDNN_FOUND
#  CUDNN_INCLUDE_PATH
#  CUDNN_LIBRARY_PATH
#

include(FindPackageHandleStandardArgs)

set(CUDNN_ROOT $ENV{CUDNN_ROOT_DIR} CACHE PATH "Folder containing NVIDIA cuDNN")
if (DEFINED $ENV{CUDNN_ROOT_DIR})
  message(WARNING "CUDNN_ROOT_DIR is deprecated. Please set CUDNN_ROOT instead.")
endif()
list(APPEND CUDNN_ROOT $ENV{CUDNN_ROOT_DIR} ${CUDA_TOOLKIT_ROOT_DIR})

# Compatible layer for CMake <3.12. CUDNN_ROOT will be accounted in for searching paths and libraries for CMake >=3.12.
list(APPEND CMAKE_PREFIX_PATH ${CUDNN_ROOT})

set(CUDNN_INCLUDE_DIR $ENV{CUDNN_INCLUDE_DIR} CACHE PATH "Folder containing NVIDIA cuDNN header files")

find_path(CUDNN_INCLUDE_PATH cudnn.h
  HINTS ${CUDNN_INCLUDE_DIR}
  PATH_SUFFIXES cuda/include cuda include)

option(CUDNN_STATIC "Look for static CUDNN" OFF)
if (CUDNN_STATIC)
  set(CUDNN_LIBNAME "libcudnn_static.a")
else()
  set(CUDNN_LIBNAME "cudnn")
endif()

set(CUDNN_LIBRARY $ENV{CUDNN_LIBRARY} CACHE PATH "Path to the cudnn library file (e.g., libcudnn.so)")
if (CUDNN_LIBRARY MATCHES ".*cudnn_static.a" AND NOT CUDNN_STATIC)
  message(WARNING "CUDNN_LIBRARY points to a static library (${CUDNN_LIBRARY}) but CUDNN_STATIC is OFF.")
endif()

find_library(CUDNN_LIBRARY_PATH ${CUDNN_LIBNAME}
  PATHS ${CUDNN_LIBRARY}
  PATH_SUFFIXES lib lib64 cuda/lib cuda/lib64 lib/x64)

find_package_handle_standard_args(CUDNN DEFAULT_MSG CUDNN_LIBRARY_PATH CUDNN_INCLUDE_PATH)

mark_as_advanced(CUDNN_ROOT CUDNN_INCLUDE_DIR CUDNN_LIBRARY)