Merge topic 'add-ProcessorCount-module'

e6c2701 ProcessorCount: Use ERROR_QUIET with execute_process (#11302)
4dd2ec2 ProcessorCount: Test fails if count is 0 (#11302)
6dd74d5 ProcessorCount: Add support for remaining platforms (#11302)
c159836 ProcessorCount test: more output, do not fail. (#11302)
6259bc4 Compare ProcessorCount to SystemInformation count. (#11302)
3430955 Add ProcessorCount support for QNX via pidin. (#11302)
4d6418f If getconf returns empty output, try cpuinfo. (#11302)
9cc8ad9 Add correct module notice header.
abbaa12 Add module ProcessorCount.cmake (#11302)

1 files changed, 183 insertions, 0 deletions

diff --git a/Modules/ProcessorCount.cmake b/Modules/ProcessorCount.cmake
new file mode 100644
index 0000000..eff4766
--- /dev/null
+++ b/Modules/ProcessorCount.cmake
@@ -0,0 +1,183 @@
+# - ProcessorCount(var)
+# Determine the number of processors/cores and save value in ${var}
+#
+# Sets the variable named ${var} to the number of physical cores available on
+# the machine if the information can be determined. Otherwise it is set to 0.
+# Currently this functionality is implemented for AIX, cygwin, FreeBSD, HPUX,
+# IRIX, Linux, Mac OS X, QNX, Sun and Windows.
+#
+# This function is guaranteed to return a positive integer (>=1) if it
+# succeeds. It returns 0 if there's a problem determining the processor count.
+#
+# Example use, in a ctest -S dashboard script:
+#
+#   include(ProcessorCount)
+#   ProcessorCount(N)
+#   if(NOT N EQUAL 0)
+#     set(CTEST_BUILD_FLAGS -j${N})
+#     set(ctest_test_args ${ctest_test_args} PARALLEL_LEVEL ${N})
+#   endif()
+#
+# This function is intended to offer an approximation of the value of the
+# number of compute cores available on the current machine, such that you
+# may use that value for parallel building and parallel testing. It is meant
+# to help utilize as much of the machine as seems reasonable. Of course,
+# knowledge of what else might be running on the machine simultaneously
+# should be used when deciding whether to request a machine's full capacity
+# all for yourself.
+
+# A more reliable way might be to compile a small C program that uses the CPUID
+# instruction, but that again requires compiler support or compiling assembler
+# code.
+
+#=============================================================================
+# Copyright 2010-2011 Kitware, Inc.
+#
+# Distributed under the OSI-approved BSD License (the "License");
+# see accompanying file Copyright.txt for details.
+#
+# This software is distributed WITHOUT ANY WARRANTY; without even the
+# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+# See the License for more information.
+#=============================================================================
+# (To distribute this file outside of CMake, substitute the full
+#  License text for the above reference.)
+
+function(ProcessorCount var)
+  # Unknown:
+  set(count 0)
+
+  if(WIN32)
+    # Windows:
+    set(count "$ENV{NUMBER_OF_PROCESSORS}")
+    #message("ProcessorCount: WIN32, trying environment variable")
+  endif()
+
+  if(NOT count)
+    # Mac, FreeBSD, OpenBSD (systems with sysctl):
+    find_program(ProcessorCount_cmd_sysctl sysctl
+      PATHS /usr/sbin /sbin)
+    if(ProcessorCount_cmd_sysctl)
+      execute_process(COMMAND ${ProcessorCount_cmd_sysctl} -n hw.ncpu
+        ERROR_QUIET
+        OUTPUT_STRIP_TRAILING_WHITESPACE
+        OUTPUT_VARIABLE count)
+      #message("ProcessorCount: trying sysctl '${ProcessorCount_cmd_sysctl}'")
+    endif()
+  endif()
+
+  if(NOT count)
+    # Linux (systems with getconf):
+    find_program(ProcessorCount_cmd_getconf getconf)
+    if(ProcessorCount_cmd_getconf)
+      execute_process(COMMAND ${ProcessorCount_cmd_getconf} _NPROCESSORS_ONLN
+        ERROR_QUIET
+        OUTPUT_STRIP_TRAILING_WHITESPACE
+        OUTPUT_VARIABLE count)
+      #message("ProcessorCount: trying getconf '${ProcessorCount_cmd_getconf}'")
+    endif()
+  endif()
+
+  if(NOT count)
+    # HPUX (systems with machinfo):
+    find_program(ProcessorCount_cmd_machinfo machinfo
+      PATHS /usr/contrib/bin)
+    if(ProcessorCount_cmd_machinfo)
+      execute_process(COMMAND ${ProcessorCount_cmd_machinfo}
+        ERROR_QUIET
+        OUTPUT_STRIP_TRAILING_WHITESPACE
+        OUTPUT_VARIABLE machinfo_output)
+      string(REGEX MATCHALL "Number of CPUs = ([0-9]+)" procs "${machinfo_output}")
+      set(count "${CMAKE_MATCH_1}")
+      #message("ProcessorCount: trying machinfo '${ProcessorCount_cmd_machinfo}'")
+    endif()
+  endif()
+
+  if(NOT count)
+    # IRIX (systems with hinv):
+    find_program(ProcessorCount_cmd_hinv hinv
+      PATHS /sbin)
+    if(ProcessorCount_cmd_hinv)
+      execute_process(COMMAND ${ProcessorCount_cmd_hinv}
+        ERROR_QUIET
+        OUTPUT_STRIP_TRAILING_WHITESPACE
+        OUTPUT_VARIABLE hinv_output)
+      string(REGEX MATCHALL "([0-9]+) .* Processors" procs "${hinv_output}")
+      set(count "${CMAKE_MATCH_1}")
+      #message("ProcessorCount: trying hinv '${ProcessorCount_cmd_hinv}'")
+    endif()
+  endif()
+
+  if(NOT count)
+    # AIX (systems with lsconf):
+    find_program(ProcessorCount_cmd_lsconf lsconf
+      PATHS /usr/sbin)
+    if(ProcessorCount_cmd_lsconf)
+      execute_process(COMMAND ${ProcessorCount_cmd_lsconf}
+        ERROR_QUIET
+        OUTPUT_STRIP_TRAILING_WHITESPACE
+        OUTPUT_VARIABLE lsconf_output)
+      string(REGEX MATCHALL "Number Of Processors: ([0-9]+)" procs "${lsconf_output}")
+      set(count "${CMAKE_MATCH_1}")
+      #message("ProcessorCount: trying lsconf '${ProcessorCount_cmd_lsconf}'")
+    endif()
+  endif()
+
+  if(NOT count)
+    # QNX (systems with pidin):
+    find_program(ProcessorCount_cmd_pidin pidin)
+    if(ProcessorCount_cmd_pidin)
+      execute_process(COMMAND ${ProcessorCount_cmd_pidin} info
+        ERROR_QUIET
+        OUTPUT_STRIP_TRAILING_WHITESPACE
+        OUTPUT_VARIABLE pidin_output)
+      string(REGEX MATCHALL "Processor[0-9]+: " procs "${pidin_output}")
+      list(LENGTH procs count)
+      #message("ProcessorCount: trying pidin '${ProcessorCount_cmd_pidin}'")
+    endif()
+  endif()
+
+  if(NOT count)
+    # Sun (systems where uname -X emits "NumCPU" in its output):
+    find_program(ProcessorCount_cmd_uname uname)
+    if(ProcessorCount_cmd_uname)
+      execute_process(COMMAND ${ProcessorCount_cmd_uname} -X
+        ERROR_QUIET
+        OUTPUT_STRIP_TRAILING_WHITESPACE
+        OUTPUT_VARIABLE uname_X_output)
+      string(REGEX MATCHALL "NumCPU = ([0-9]+)" procs "${uname_X_output}")
+      set(count "${CMAKE_MATCH_1}")
+      #message("ProcessorCount: trying uname -X '${ProcessorCount_cmd_uname}'")
+    endif()
+  endif()
+
+  # Execute this code when all previously attempted methods return empty
+  # output:
+  #
+  if(NOT count)
+    # Systems with /proc/cpuinfo:
+    set(cpuinfo_file /proc/cpuinfo)
+    if(EXISTS "${cpuinfo_file}")
+      file(STRINGS "${cpuinfo_file}" procs REGEX "^processor.: [0-9]+$")
+      list(LENGTH procs count)
+      #message("ProcessorCount: trying cpuinfo '${cpuinfo_file}'")
+    endif()
+  endif()
+
+  # Since cygwin builds of CMake do not define WIN32 anymore, but they still
+  # run on Windows, and will still have this env var defined:
+  #
+  if(NOT count)
+    set(count "$ENV{NUMBER_OF_PROCESSORS}")
+    #message("ProcessorCount: last fallback, trying environment variable")
+  endif()
+
+  # Ensure an integer return (avoid inadvertently returning an empty string
+  # or an error string)... If it's not a decimal integer, return 0:
+  #
+  if(NOT count MATCHES "^[0-9]+$")
+    set(count 0)
+  endif()
+
+  set(${var} ${count} PARENT_SCOPE)
+endfunction()