Current File : //usr/local/share/cmake/Help/command/cmake_host_system_information.rst
cmake_host_system_information
-----------------------------
Query host system specific information.
.. code-block:: cmake
cmake_host_system_information(RESULT <variable> QUERY <key> ...)
Queries system information of the host system on which cmake runs.
One or more ``<key>`` can be provided to select the information to be
queried. The list of queried values is stored in ``<variable>``.
``<key>`` can be one of the following values:
``NUMBER_OF_LOGICAL_CORES``
Number of logical cores
``NUMBER_OF_PHYSICAL_CORES``
Number of physical cores
``HOSTNAME``
Hostname
``FQDN``
Fully qualified domain name
``TOTAL_VIRTUAL_MEMORY``
Total virtual memory in MiB [#mebibytes]_
``AVAILABLE_VIRTUAL_MEMORY``
Available virtual memory in MiB [#mebibytes]_
``TOTAL_PHYSICAL_MEMORY``
Total physical memory in MiB [#mebibytes]_
``AVAILABLE_PHYSICAL_MEMORY``
Available physical memory in MiB [#mebibytes]_
``IS_64BIT``
.. versionadded:: 3.10
One if processor is 64Bit
``HAS_FPU``
.. versionadded:: 3.10
One if processor has floating point unit
``HAS_MMX``
.. versionadded:: 3.10
One if processor supports MMX instructions
``HAS_MMX_PLUS``
.. versionadded:: 3.10
One if processor supports Ext. MMX instructions
``HAS_SSE``
.. versionadded:: 3.10
One if processor supports SSE instructions
``HAS_SSE2``
.. versionadded:: 3.10
One if processor supports SSE2 instructions
``HAS_SSE_FP``
.. versionadded:: 3.10
One if processor supports SSE FP instructions
``HAS_SSE_MMX``
.. versionadded:: 3.10
One if processor supports SSE MMX instructions
``HAS_AMD_3DNOW``
.. versionadded:: 3.10
One if processor supports 3DNow instructions
``HAS_AMD_3DNOW_PLUS``
.. versionadded:: 3.10
One if processor supports 3DNow+ instructions
``HAS_IA64``
.. versionadded:: 3.10
One if IA64 processor emulating x86
``HAS_SERIAL_NUMBER``
.. versionadded:: 3.10
One if processor has serial number
``PROCESSOR_SERIAL_NUMBER``
.. versionadded:: 3.10
Processor serial number
``PROCESSOR_NAME``
.. versionadded:: 3.10
Human readable processor name
``PROCESSOR_DESCRIPTION``
.. versionadded:: 3.10
Human readable full processor description
``OS_NAME``
.. versionadded:: 3.10
See :variable:`CMAKE_HOST_SYSTEM_NAME`
``OS_RELEASE``
.. versionadded:: 3.10
The OS sub-type e.g. on Windows ``Professional``
``OS_VERSION``
.. versionadded:: 3.10
The OS build ID
``OS_PLATFORM``
.. versionadded:: 3.10
See :variable:`CMAKE_HOST_SYSTEM_PROCESSOR`
``DISTRIB_INFO``
.. versionadded:: 3.22
Read :file:`/etc/os-release` file and define the given ``<variable>``
into a list of read variables
``DISTRIB_<name>``
.. versionadded:: 3.22
Get the ``<name>`` variable (see `man 5 os-release`_) if it exists in the
:file:`/etc/os-release` file
Example:
.. code-block:: cmake
cmake_host_system_information(RESULT PRETTY_NAME QUERY DISTRIB_PRETTY_NAME)
message(STATUS "${PRETTY_NAME}")
cmake_host_system_information(RESULT DISTRO QUERY DISTRIB_INFO)
foreach(VAR IN LISTS DISTRO)
message(STATUS "${VAR}=`${${VAR}}`")
endforeach()
Output::
-- Ubuntu 20.04.2 LTS
-- DISTRO_BUG_REPORT_URL=`https://bugs.launchpad.net/ubuntu/`
-- DISTRO_HOME_URL=`https://www.ubuntu.com/`
-- DISTRO_ID=`ubuntu`
-- DISTRO_ID_LIKE=`debian`
-- DISTRO_NAME=`Ubuntu`
-- DISTRO_PRETTY_NAME=`Ubuntu 20.04.2 LTS`
-- DISTRO_PRIVACY_POLICY_URL=`https://www.ubuntu.com/legal/terms-and-policies/privacy-policy`
-- DISTRO_SUPPORT_URL=`https://help.ubuntu.com/`
-- DISTRO_UBUNTU_CODENAME=`focal`
-- DISTRO_VERSION=`20.04.2 LTS (Focal Fossa)`
-- DISTRO_VERSION_CODENAME=`focal`
-- DISTRO_VERSION_ID=`20.04`
If :file:`/etc/os-release` file is not found, the command tries to gather OS
identification via fallback scripts. The fallback script can use `various
distribution-specific files`_ to collect OS identification data and map it
into `man 5 os-release`_ variables.
Fallback Interface Variables
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.. variable:: CMAKE_GET_OS_RELEASE_FALLBACK_SCRIPTS
In addition to the scripts shipped with CMake, a user may append full
paths to his script(s) to the this list. The script filename has the
following format: ``NNN-<name>.cmake``, where ``NNN`` is three digits
used to apply collected scripts in a specific order.
.. variable:: CMAKE_GET_OS_RELEASE_FALLBACK_RESULT_<varname>
Variables collected by the user provided fallback script
ought to be assigned to CMake variables using this naming
convention. Example, the ``ID`` variable from the manual becomes
``CMAKE_GET_OS_RELEASE_FALLBACK_RESULT_ID``.
.. variable:: CMAKE_GET_OS_RELEASE_FALLBACK_RESULT
The fallback script ought to store names of all assigned
``CMAKE_GET_OS_RELEASE_FALLBACK_RESULT_<varname>`` variables in this list.
Example:
.. code-block:: cmake
# Try to detect some old distribution
# See also
# - http://linuxmafia.com/faq/Admin/release-files.html
#
if(NOT EXISTS "${CMAKE_SYSROOT}/etc/foobar-release")
return()
endif()
# Get the first string only
file(
STRINGS "${CMAKE_SYSROOT}/etc/foobar-release" CMAKE_GET_OS_RELEASE_FALLBACK_CONTENT
LIMIT_COUNT 1
)
#
# Example:
#
# Foobar distribution release 1.2.3 (server)
#
if(CMAKE_GET_OS_RELEASE_FALLBACK_CONTENT MATCHES "Foobar distribution release ([0-9\.]+) .*")
set(CMAKE_GET_OS_RELEASE_FALLBACK_RESULT_NAME Foobar)
set(CMAKE_GET_OS_RELEASE_FALLBACK_RESULT_PRETTY_NAME "${CMAKE_GET_OS_RELEASE_FALLBACK_CONTENT}")
set(CMAKE_GET_OS_RELEASE_FALLBACK_RESULT_ID foobar)
set(CMAKE_GET_OS_RELEASE_FALLBACK_RESULT_VERSION ${CMAKE_MATCH_1})
set(CMAKE_GET_OS_RELEASE_FALLBACK_RESULT_VERSION_ID ${CMAKE_MATCH_1})
list(
APPEND CMAKE_GET_OS_RELEASE_FALLBACK_RESULT
CMAKE_GET_OS_RELEASE_FALLBACK_RESULT_NAME
CMAKE_GET_OS_RELEASE_FALLBACK_RESULT_PRETTY_NAME
CMAKE_GET_OS_RELEASE_FALLBACK_RESULT_ID
CMAKE_GET_OS_RELEASE_FALLBACK_RESULT_VERSION
CMAKE_GET_OS_RELEASE_FALLBACK_RESULT_VERSION_ID
)
endif()
unset(CMAKE_GET_OS_RELEASE_FALLBACK_CONTENT)
.. rubric:: Footnotes
.. [#mebibytes] One MiB (mebibyte) is equal to 1024x1024 bytes.
.. _man 5 os-release: https://www.freedesktop.org/software/systemd/man/os-release.html
.. _various distribution-specific files: http://linuxmafia.com/faq/Admin/release-files.html
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