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# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
# file Copyright.txt or https://cmake.org/licensing for details.
# This file is for sharing code for finding basic CUDA toolkit information between
# CMakeDetermineCUDACompiler.cmake and FindCUDAToolkit.cmake.
# For NVCC we can easily deduce the SDK binary directory from the compiler path.
if(CMAKE_CUDA_COMPILER_LOADED AND NOT CUDAToolkit_BIN_DIR AND CMAKE_CUDA_COMPILER_ID STREQUAL "NVIDIA")
get_filename_component(cuda_dir "${CMAKE_CUDA_COMPILER}" DIRECTORY)
set(CUDAToolkit_BIN_DIR "${cuda_dir}" CACHE PATH "")
mark_as_advanced(CUDAToolkit_BIN_DIR)
unset(cuda_dir)
endif()
# Try language- or user-provided path first.
if(CUDAToolkit_BIN_DIR)
find_program(CUDAToolkit_NVCC_EXECUTABLE
NAMES nvcc nvcc.exe
PATHS ${CUDAToolkit_BIN_DIR}
NO_DEFAULT_PATH
)
endif()
# Search using CUDAToolkit_ROOT
find_program(CUDAToolkit_NVCC_EXECUTABLE
NAMES nvcc nvcc.exe
PATHS ENV CUDA_PATH
PATH_SUFFIXES bin
)
# If the user specified CUDAToolkit_ROOT but nvcc could not be found, this is an error.
if(NOT CUDAToolkit_NVCC_EXECUTABLE AND (DEFINED CUDAToolkit_ROOT OR DEFINED ENV{CUDAToolkit_ROOT}))
# Declare error messages now, print later depending on find_package args.
set(fail_base "Could not find nvcc executable in path specified by")
set(cuda_root_fail "${fail_base} CUDAToolkit_ROOT=${CUDAToolkit_ROOT}")
set(env_cuda_root_fail "${fail_base} environment variable CUDAToolkit_ROOT=$ENV{CUDAToolkit_ROOT}")
if(CUDAToolkit_FIND_REQUIRED)
if(DEFINED CUDAToolkit_ROOT)
message(FATAL_ERROR ${cuda_root_fail})
elseif(DEFINED ENV{CUDAToolkit_ROOT})
message(FATAL_ERROR ${env_cuda_root_fail})
endif()
else()
if(NOT CUDAToolkit_FIND_QUIETLY)
if(DEFINED CUDAToolkit_ROOT)
message(STATUS ${cuda_root_fail})
elseif(DEFINED ENV{CUDAToolkit_ROOT})
message(STATUS ${env_cuda_root_fail})
endif()
endif()
set(CUDAToolkit_FOUND FALSE)
unset(fail_base)
unset(cuda_root_fail)
unset(env_cuda_root_fail)
return()
endif()
endif()
# CUDAToolkit_ROOT cmake / env variable not specified, try platform defaults.
#
# - Linux: /usr/local/cuda-X.Y
# - macOS: /Developer/NVIDIA/CUDA-X.Y
# - Windows: C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\vX.Y
#
# We will also search the default symlink location /usr/local/cuda first since
# if CUDAToolkit_ROOT is not specified, it is assumed that the symlinked
# directory is the desired location.
if(NOT CUDAToolkit_NVCC_EXECUTABLE)
if(UNIX)
if(NOT APPLE)
set(platform_base "/usr/local/cuda-")
else()
set(platform_base "/Developer/NVIDIA/CUDA-")
endif()
else()
set(platform_base "C:\\Program Files\\NVIDIA GPU Computing Toolkit\\CUDA\\v")
endif()
# Build out a descending list of possible cuda installations, e.g.
file(GLOB possible_paths "${platform_base}*")
# Iterate the glob results and create a descending list.
set(possible_versions)
foreach (p ${possible_paths})
# Extract version number from end of string
string(REGEX MATCH "[0-9][0-9]?\\.[0-9]$" p_version ${p})
if(IS_DIRECTORY ${p} AND p_version)
list(APPEND possible_versions ${p_version})
endif()
endforeach()
# Cannot use list(SORT) because that is alphabetical, we need numerical.
# NOTE: this is not an efficient sorting strategy. But even if a user had
# every possible version of CUDA installed, this wouldn't create any
# significant overhead.
set(versions)
foreach (v ${possible_versions})
list(LENGTH versions num_versions)
# First version, nothing to compare with so just append.
if(num_versions EQUAL 0)
list(APPEND versions ${v})
else()
# Loop through list. Insert at an index when comparison is
# VERSION_GREATER since we want a descending list. Duplicates will not
# happen since this came from a glob list of directories.
set(i 0)
set(early_terminate FALSE)
while (i LESS num_versions)
list(GET versions ${i} curr)
if(v VERSION_GREATER curr)
list(INSERT versions ${i} ${v})
set(early_terminate TRUE)
break()
endif()
math(EXPR i "${i} + 1")
endwhile()
# If it did not get inserted, place it at the end.
if(NOT early_terminate)
list(APPEND versions ${v})
endif()
endif()
endforeach()
# With a descending list of versions, populate possible paths to search.
set(search_paths)
foreach (v ${versions})
list(APPEND search_paths "${platform_base}${v}")
endforeach()
# Force the global default /usr/local/cuda to the front on Unix.
if(UNIX)
list(INSERT search_paths 0 "/usr/local/cuda")
endif()
# Now search for nvcc again using the platform default search paths.
find_program(CUDAToolkit_NVCC_EXECUTABLE
NAMES nvcc nvcc.exe
PATHS ${search_paths}
PATH_SUFFIXES bin
)
# We are done with these variables now, cleanup for caller.
unset(platform_base)
unset(possible_paths)
unset(possible_versions)
unset(versions)
unset(i)
unset(early_terminate)
unset(search_paths)
if(NOT CUDAToolkit_NVCC_EXECUTABLE)
if(CUDAToolkit_FIND_REQUIRED)
message(FATAL_ERROR "Could not find nvcc, please set CUDAToolkit_ROOT.")
elseif(NOT CUDAToolkit_FIND_QUIETLY)
message(STATUS "Could not find nvcc, please set CUDAToolkit_ROOT.")
endif()
set(CUDAToolkit_FOUND FALSE)
return()
endif()
endif()
if(NOT CUDAToolkit_BIN_DIR AND CUDAToolkit_NVCC_EXECUTABLE)
get_filename_component(cuda_dir "${CUDAToolkit_NVCC_EXECUTABLE}" DIRECTORY)
set(CUDAToolkit_BIN_DIR "${cuda_dir}" CACHE PATH "" FORCE)
mark_as_advanced(CUDAToolkit_BIN_DIR)
unset(cuda_dir)
endif()
get_filename_component(CUDAToolkit_ROOT_DIR ${CUDAToolkit_BIN_DIR} DIRECTORY ABSOLUTE)
# Handle cross compilation
if(CMAKE_CROSSCOMPILING)
if(CMAKE_SYSTEM_PROCESSOR STREQUAL "armv7-a")
# Support for NVPACK
set(CUDAToolkit_TARGET_NAME "armv7-linux-androideabi")
elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "arm")
# Support for arm cross compilation
set(CUDAToolkit_TARGET_NAME "armv7-linux-gnueabihf")
elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "aarch64")
# Support for aarch64 cross compilation
if(ANDROID_ARCH_NAME STREQUAL "arm64")
set(CUDAToolkit_TARGET_NAME "aarch64-linux-androideabi")
else()
set(CUDAToolkit_TARGET_NAME "aarch64-linux")
endif(ANDROID_ARCH_NAME STREQUAL "arm64")
elseif(CMAKE_SYSTEM_PROCESSOR STREQUAL "x86_64")
set(CUDAToolkit_TARGET_NAME "x86_64-linux")
endif()
if(EXISTS "${CUDAToolkit_ROOT_DIR}/targets/${CUDAToolkit_TARGET_NAME}")
set(CUDAToolkit_TARGET_DIR "${CUDAToolkit_ROOT_DIR}/targets/${CUDAToolkit_TARGET_NAME}")
# add known CUDA target root path to the set of directories we search for programs, libraries and headers
list(PREPEND CMAKE_FIND_ROOT_PATH "${CUDAToolkit_TARGET_DIR}")
# Mark that we need to pop the root search path changes after we have
# found all cuda libraries so that searches for our cross-compilation
# libraries work when another cuda sdk is in CMAKE_PREFIX_PATH or
# PATh
set(_CUDAToolkit_Pop_ROOT_PATH True)
endif()
else()
# Not cross compiling
set(CUDAToolkit_TARGET_DIR "${CUDAToolkit_ROOT_DIR}")
# Now that we have the real ROOT_DIR, find components inside it.
list(APPEND CMAKE_PREFIX_PATH ${CUDAToolkit_ROOT_DIR})
# Mark that we need to pop the prefix path changes after we have
# found the cudart library.
set(_CUDAToolkit_Pop_Prefix True)
endif()
# Find the include/ directory
find_path(CUDAToolkit_INCLUDE_DIR
NAMES cuda_runtime.h
)
# Find a tentative CUDAToolkit_LIBRARY_DIR. FindCUDAToolkit overrides it by searching for the CUDA runtime,
# but we can't do that here, as CMakeDetermineCUDACompiler wants to use it before the variables necessary
# for find_library() have been initialized.
if(EXISTS "${CUDAToolkit_TARGET_DIR}/lib64")
set(CUDAToolkit_LIBRARY_DIR "${CUDAToolkit_TARGET_DIR}/lib64")
elseif(EXISTS "${CUDAToolkit_TARGET_DIR}/lib/x64")
set(CUDAToolkit_LIBRARY_DIR "${CUDAToolkit_TARGET_DIR}/lib/x64")
elseif(EXISTS "${CUDAToolkit_TARGET_DIR}/lib")
set(CUDAToolkit_LIBRARY_DIR "${CUDAToolkit_TARGET_DIR}/lib")
endif()
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