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cmake/Modules/GNUInstallDirs.cmake

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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.
#[=======================================================================[.rst:
GNUInstallDirs
--------------
Define GNU standard installation directories
Provides install directory variables as defined by the
`GNU Coding Standards`_.
.. _`GNU Coding Standards`: https://www.gnu.org/prep/standards/html_node/Directory-Variables.html
Result Variables
^^^^^^^^^^^^^^^^
Inclusion of this module defines the following variables:
``CMAKE_INSTALL_<dir>``
Destination for files of a given type. This value may be passed to
the ``DESTINATION`` options of :command:`install` commands for the
corresponding file type. It should typically be a path relative to
the installation prefix so that it can be converted to an absolute
path in a relocatable way (see ``CMAKE_INSTALL_FULL_<dir>``).
However, an absolute path is also allowed.
``CMAKE_INSTALL_FULL_<dir>``
The absolute path generated from the corresponding ``CMAKE_INSTALL_<dir>``
value. If the value is not already an absolute path, an absolute path
is constructed typically by prepending the value of the
:variable:`CMAKE_INSTALL_PREFIX` variable. However, there are some
`special cases`_ as documented below.
where ``<dir>`` is one of:
``BINDIR``
user executables (``bin``)
``SBINDIR``
system admin executables (``sbin``)
``LIBEXECDIR``
program executables (``libexec``)
``SYSCONFDIR``
read-only single-machine data (``etc``)
``SHAREDSTATEDIR``
modifiable architecture-independent data (``com``)
``LOCALSTATEDIR``
modifiable single-machine data (``var``)
``RUNSTATEDIR``
.. versionadded:: 3.9
run-time variable data (``LOCALSTATEDIR/run``)
``LIBDIR``
object code libraries (``lib`` or ``lib64``
or ``lib/<multiarch-tuple>`` on Debian)
``INCLUDEDIR``
C header files (``include``)
``OLDINCLUDEDIR``
C header files for non-gcc (``/usr/include``)
``DATAROOTDIR``
read-only architecture-independent data root (``share``)
``DATADIR``
read-only architecture-independent data (``DATAROOTDIR``)
``INFODIR``
info documentation (``DATAROOTDIR/info``)
``LOCALEDIR``
locale-dependent data (``DATAROOTDIR/locale``)
``MANDIR``
man documentation (``DATAROOTDIR/man``)
``DOCDIR``
documentation root (``DATAROOTDIR/doc/PROJECT_NAME``)
If the includer does not define a value the above-shown default will be
used and the value will appear in the cache for editing by the user.
Special Cases
^^^^^^^^^^^^^
.. versionadded:: 3.4
The following values of :variable:`CMAKE_INSTALL_PREFIX` are special:
``/``
For ``<dir>`` other than the ``SYSCONFDIR``, ``LOCALSTATEDIR`` and
``RUNSTATEDIR``, the value of ``CMAKE_INSTALL_<dir>`` is prefixed
with ``usr/`` if it is not user-specified as an absolute path.
For example, the ``INCLUDEDIR`` value ``include`` becomes ``usr/include``.
This is required by the `GNU Coding Standards`_, which state:
When building the complete GNU system, the prefix will be empty
and ``/usr`` will be a symbolic link to ``/``.
``/usr``
For ``<dir>`` equal to ``SYSCONFDIR``, ``LOCALSTATEDIR`` or
``RUNSTATEDIR``, the ``CMAKE_INSTALL_FULL_<dir>`` is computed by
prepending just ``/`` to the value of ``CMAKE_INSTALL_<dir>``
if it is not user-specified as an absolute path.
For example, the ``SYSCONFDIR`` value ``etc`` becomes ``/etc``.
This is required by the `GNU Coding Standards`_.
``/opt/...``
For ``<dir>`` equal to ``SYSCONFDIR``, ``LOCALSTATEDIR`` or
``RUNSTATEDIR``, the ``CMAKE_INSTALL_FULL_<dir>`` is computed by
*appending* the prefix to the value of ``CMAKE_INSTALL_<dir>``
if it is not user-specified as an absolute path.
For example, the ``SYSCONFDIR`` value ``etc`` becomes ``/etc/opt/...``.
This is defined by the `Filesystem Hierarchy Standard`_.
.. _`Filesystem Hierarchy Standard`: https://refspecs.linuxfoundation.org/FHS_3.0/fhs/index.html
Macros
^^^^^^
.. command:: GNUInstallDirs_get_absolute_install_dir
::
GNUInstallDirs_get_absolute_install_dir(absvar var dirname)
.. versionadded:: 3.7
Set the given variable ``absvar`` to the absolute path contained
within the variable ``var``. This is to allow the computation of an
absolute path, accounting for all the special cases documented
above. While this macro is used to compute the various
``CMAKE_INSTALL_FULL_<dir>`` variables, it is exposed publicly to
allow users who create additional path variables to also compute
absolute paths where necessary, using the same logic. ``dirname`` is
the directory name to get, e.g. ``BINDIR``.
.. versionchanged:: 3.20
Added the ``<dirname>`` parameter. Previous versions of CMake passed
this value through the variable ``${dir}``.
#]=======================================================================]
cmake_policy(PUSH)
cmake_policy(SET CMP0054 NEW) # if() quoted variables not dereferenced
# Convert a cache variable to PATH type
macro(_GNUInstallDirs_cache_convert_to_path var description)
get_property(_GNUInstallDirs_cache_type CACHE ${var} PROPERTY TYPE)
if(_GNUInstallDirs_cache_type STREQUAL "UNINITIALIZED")
file(TO_CMAKE_PATH "${${var}}" _GNUInstallDirs_cmakepath)
set_property(CACHE ${var} PROPERTY TYPE PATH)
set_property(CACHE ${var} PROPERTY VALUE "${_GNUInstallDirs_cmakepath}")
set_property(CACHE ${var} PROPERTY HELPSTRING "${description}")
unset(_GNUInstallDirs_cmakepath)
endif()
unset(_GNUInstallDirs_cache_type)
endmacro()
# Create a cache variable with default for a path.
macro(_GNUInstallDirs_cache_path var default description)
if(NOT DEFINED ${var})
set(${var} "${default}" CACHE PATH "${description}")
endif()
_GNUInstallDirs_cache_convert_to_path("${var}" "${description}")
endmacro()
# Create a cache variable with not default for a path, with a fallback
# when unset; used for entries slaved to other entries such as
# DATAROOTDIR.
macro(_GNUInstallDirs_cache_path_fallback var default description)
if(NOT ${var})
set(${var} "" CACHE PATH "${description}")
set(${var} "${default}")
endif()
_GNUInstallDirs_cache_convert_to_path("${var}" "${description}")
endmacro()
# Installation directories
#
_GNUInstallDirs_cache_path(CMAKE_INSTALL_BINDIR "bin"
"User executables (bin)")
_GNUInstallDirs_cache_path(CMAKE_INSTALL_SBINDIR "sbin"
"System admin executables (sbin)")
_GNUInstallDirs_cache_path(CMAKE_INSTALL_LIBEXECDIR "libexec"
"Program executables (libexec)")
_GNUInstallDirs_cache_path(CMAKE_INSTALL_SYSCONFDIR "etc"
"Read-only single-machine data (etc)")
_GNUInstallDirs_cache_path(CMAKE_INSTALL_SHAREDSTATEDIR "com"
"Modifiable architecture-independent data (com)")
_GNUInstallDirs_cache_path(CMAKE_INSTALL_LOCALSTATEDIR "var"
"Modifiable single-machine data (var)")
# We check if the variable was manually set and not cached, in order to
# allow projects to set the values as normal variables before including
# GNUInstallDirs to avoid having the entries cached or user-editable. It
# replaces the "if(NOT DEFINED CMAKE_INSTALL_XXX)" checks in all the
# other cases.
# If CMAKE_INSTALL_LIBDIR is defined, if _libdir_set is false, then the
# variable is a normal one, otherwise it is a cache one.
get_property(_libdir_set CACHE CMAKE_INSTALL_LIBDIR PROPERTY TYPE SET)
if(NOT DEFINED CMAKE_INSTALL_LIBDIR OR (_libdir_set
AND DEFINED _GNUInstallDirs_LAST_CMAKE_INSTALL_PREFIX
AND NOT "${_GNUInstallDirs_LAST_CMAKE_INSTALL_PREFIX}" STREQUAL "${CMAKE_INSTALL_PREFIX}"))
# If CMAKE_INSTALL_LIBDIR is not defined, it is always executed.
# Otherwise:
# * if _libdir_set is false it is not executed (meaning that it is
# not a cache variable)
# * if _GNUInstallDirs_LAST_CMAKE_INSTALL_PREFIX is not defined it is
# not executed
# * if _GNUInstallDirs_LAST_CMAKE_INSTALL_PREFIX and
# CMAKE_INSTALL_PREFIX are the same string it is not executed.
# _GNUInstallDirs_LAST_CMAKE_INSTALL_PREFIX is updated after the
# execution, of this part of code, therefore at the next inclusion
# of the file, CMAKE_INSTALL_LIBDIR is defined, and the 2 strings
# are equal, meaning that the if is not executed the code the
# second time.
set(_LIBDIR_DEFAULT "lib")
# Override this default 'lib' with 'lib64' iff:
# - we are on Linux system but NOT cross-compiling
# - we are NOT on debian
# - we are on a 64 bits system
# reason is: amd64 ABI: https://github.com/hjl-tools/x86-psABI/wiki/X86-psABI
# For Debian with multiarch, use 'lib/${CMAKE_LIBRARY_ARCHITECTURE}' if
# CMAKE_LIBRARY_ARCHITECTURE is set (which contains e.g. "i386-linux-gnu"
# and CMAKE_INSTALL_PREFIX is "/usr"
# See http://wiki.debian.org/Multiarch
if(DEFINED _GNUInstallDirs_LAST_CMAKE_INSTALL_PREFIX)
set(__LAST_LIBDIR_DEFAULT "lib")
# __LAST_LIBDIR_DEFAULT is the default value that we compute from
# _GNUInstallDirs_LAST_CMAKE_INSTALL_PREFIX, not a cache entry for
# the value that was last used as the default.
# This value is used to figure out whether the user changed the
# CMAKE_INSTALL_LIBDIR value manually, or if the value was the
# default one. When CMAKE_INSTALL_PREFIX changes, the value is
# updated to the new default, unless the user explicitly changed it.
endif()
if (NOT DEFINED CMAKE_SYSTEM_NAME OR NOT DEFINED CMAKE_SIZEOF_VOID_P)
message(AUTHOR_WARNING
"Unable to determine default CMAKE_INSTALL_LIBDIR directory because no target architecture is known. "
"Please enable at least one language before including GNUInstallDirs.")
endif()
if(CMAKE_SYSTEM_NAME MATCHES "^(Linux|kFreeBSD|GNU)$"
AND NOT CMAKE_CROSSCOMPILING
AND NOT EXISTS "/etc/alpine-release"
AND NOT EXISTS "/etc/arch-release")
if (EXISTS "/etc/debian_version") # is this a debian system ?
if(CMAKE_LIBRARY_ARCHITECTURE)
if("${CMAKE_INSTALL_PREFIX}" MATCHES "^/usr/?$")
set(_LIBDIR_DEFAULT "lib/${CMAKE_LIBRARY_ARCHITECTURE}")
endif()
if(DEFINED _GNUInstallDirs_LAST_CMAKE_INSTALL_PREFIX
AND "${_GNUInstallDirs_LAST_CMAKE_INSTALL_PREFIX}" MATCHES "^/usr/?$")
set(__LAST_LIBDIR_DEFAULT "lib/${CMAKE_LIBRARY_ARCHITECTURE}")
endif()
endif()
else() # not debian, rely on CMAKE_SIZEOF_VOID_P:
if("${CMAKE_SIZEOF_VOID_P}" EQUAL "8")
set(_LIBDIR_DEFAULT "lib64")
if(DEFINED _GNUInstallDirs_LAST_CMAKE_INSTALL_PREFIX)
set(__LAST_LIBDIR_DEFAULT "lib64")
endif()
endif()
endif()
endif()
if(NOT DEFINED CMAKE_INSTALL_LIBDIR)
set(CMAKE_INSTALL_LIBDIR "${_LIBDIR_DEFAULT}" CACHE PATH "Object code libraries (${_LIBDIR_DEFAULT})")
elseif(DEFINED __LAST_LIBDIR_DEFAULT
AND "${__LAST_LIBDIR_DEFAULT}" STREQUAL "${CMAKE_INSTALL_LIBDIR}")
set_property(CACHE CMAKE_INSTALL_LIBDIR PROPERTY VALUE "${_LIBDIR_DEFAULT}")
endif()
endif()
_GNUInstallDirs_cache_convert_to_path(CMAKE_INSTALL_LIBDIR "Object code libraries (lib)")
# Save for next run
set(_GNUInstallDirs_LAST_CMAKE_INSTALL_PREFIX "${CMAKE_INSTALL_PREFIX}" CACHE INTERNAL "CMAKE_INSTALL_PREFIX during last run")
unset(_libdir_set)
unset(__LAST_LIBDIR_DEFAULT)
_GNUInstallDirs_cache_path(CMAKE_INSTALL_INCLUDEDIR "include"
"C header files (include)")
_GNUInstallDirs_cache_path(CMAKE_INSTALL_OLDINCLUDEDIR "/usr/include"
"C header files for non-gcc (/usr/include)")
_GNUInstallDirs_cache_path(CMAKE_INSTALL_DATAROOTDIR "share"
"Read-only architecture-independent data root (share)")
#-----------------------------------------------------------------------------
# Values whose defaults are relative to DATAROOTDIR. Store empty values in
# the cache and store the defaults in local variables if the cache values are
# not set explicitly. This auto-updates the defaults as DATAROOTDIR changes.
_GNUInstallDirs_cache_path_fallback(CMAKE_INSTALL_DATADIR "${CMAKE_INSTALL_DATAROOTDIR}"
"Read-only architecture-independent data (DATAROOTDIR)")
if(CMAKE_SYSTEM_NAME MATCHES "^(([^kF].*)?BSD|DragonFly)$")
_GNUInstallDirs_cache_path_fallback(CMAKE_INSTALL_INFODIR "info"
"Info documentation (info)")
else()
_GNUInstallDirs_cache_path_fallback(CMAKE_INSTALL_INFODIR "${CMAKE_INSTALL_DATAROOTDIR}/info"
"Info documentation (DATAROOTDIR/info)")
endif()
if(CMAKE_SYSTEM_NAME MATCHES "^(([^k].*)?BSD|DragonFly)$")
_GNUInstallDirs_cache_path_fallback(CMAKE_INSTALL_MANDIR "man"
"Man documentation (man)")
else()
_GNUInstallDirs_cache_path_fallback(CMAKE_INSTALL_MANDIR "${CMAKE_INSTALL_DATAROOTDIR}/man"
"Man documentation (DATAROOTDIR/man)")
endif()
_GNUInstallDirs_cache_path_fallback(CMAKE_INSTALL_LOCALEDIR "${CMAKE_INSTALL_DATAROOTDIR}/locale"
"Locale-dependent data (DATAROOTDIR/locale)")
_GNUInstallDirs_cache_path_fallback(CMAKE_INSTALL_DOCDIR "${CMAKE_INSTALL_DATAROOTDIR}/doc/${PROJECT_NAME}"
"Documentation root (DATAROOTDIR/doc/PROJECT_NAME)")
_GNUInstallDirs_cache_path_fallback(CMAKE_INSTALL_RUNSTATEDIR "${CMAKE_INSTALL_LOCALSTATEDIR}/run"
"Run-time variable data (LOCALSTATEDIR/run)")
#-----------------------------------------------------------------------------
mark_as_advanced(
CMAKE_INSTALL_BINDIR
CMAKE_INSTALL_SBINDIR
CMAKE_INSTALL_LIBEXECDIR
CMAKE_INSTALL_SYSCONFDIR
CMAKE_INSTALL_SHAREDSTATEDIR
CMAKE_INSTALL_LOCALSTATEDIR
CMAKE_INSTALL_RUNSTATEDIR
CMAKE_INSTALL_LIBDIR
CMAKE_INSTALL_INCLUDEDIR
CMAKE_INSTALL_OLDINCLUDEDIR
CMAKE_INSTALL_DATAROOTDIR
CMAKE_INSTALL_DATADIR
CMAKE_INSTALL_INFODIR
CMAKE_INSTALL_LOCALEDIR
CMAKE_INSTALL_MANDIR
CMAKE_INSTALL_DOCDIR
)
macro(GNUInstallDirs_get_absolute_install_dir absvar var)
set(GGAID_extra_args ${ARGN})
list(LENGTH GGAID_extra_args GGAID_extra_arg_count)
if(GGAID_extra_arg_count GREATER "0")
list(GET GGAID_extra_args 0 GGAID_dir)
else()
# Historical behavior: use ${dir} from caller's scope
set(GGAID_dir "${dir}")
message(AUTHOR_WARNING
"GNUInstallDirs_get_absolute_install_dir called without third argument. "
"Using \${dir} from the caller's scope for compatibility with CMake 3.19 and below.")
endif()
if(NOT IS_ABSOLUTE "${${var}}")
# Handle special cases:
# - CMAKE_INSTALL_PREFIX == /
# - CMAKE_INSTALL_PREFIX == /usr
# - CMAKE_INSTALL_PREFIX == /opt/...
if("${CMAKE_INSTALL_PREFIX}" STREQUAL "/")
if("${GGAID_dir}" STREQUAL "SYSCONFDIR" OR "${GGAID_dir}" STREQUAL "LOCALSTATEDIR" OR "${GGAID_dir}" STREQUAL "RUNSTATEDIR")
set(${absvar} "/${${var}}")
else()
if (NOT "${${var}}" MATCHES "^usr/")
set(${var} "usr/${${var}}")
endif()
set(${absvar} "/${${var}}")
endif()
elseif("${CMAKE_INSTALL_PREFIX}" MATCHES "^/usr/?$")
if("${GGAID_dir}" STREQUAL "SYSCONFDIR" OR "${GGAID_dir}" STREQUAL "LOCALSTATEDIR" OR "${GGAID_dir}" STREQUAL "RUNSTATEDIR")
set(${absvar} "/${${var}}")
else()
set(${absvar} "${CMAKE_INSTALL_PREFIX}/${${var}}")
endif()
elseif("${CMAKE_INSTALL_PREFIX}" MATCHES "^/opt/.*")
if("${GGAID_dir}" STREQUAL "SYSCONFDIR" OR "${GGAID_dir}" STREQUAL "LOCALSTATEDIR" OR "${GGAID_dir}" STREQUAL "RUNSTATEDIR")
set(${absvar} "/${${var}}${CMAKE_INSTALL_PREFIX}")
else()
set(${absvar} "${CMAKE_INSTALL_PREFIX}/${${var}}")
endif()
else()
set(${absvar} "${CMAKE_INSTALL_PREFIX}/${${var}}")
endif()
else()
set(${absvar} "${${var}}")
endif()
unset(GGAID_dir)
unset(GGAID_extra_arg_count)
unset(GGAID_extra_args)
endmacro()
# Result directories
#
foreach(dir
BINDIR
SBINDIR
LIBEXECDIR
SYSCONFDIR
SHAREDSTATEDIR
LOCALSTATEDIR
RUNSTATEDIR
LIBDIR
INCLUDEDIR
OLDINCLUDEDIR
DATAROOTDIR
DATADIR
INFODIR
LOCALEDIR
MANDIR
DOCDIR
)
GNUInstallDirs_get_absolute_install_dir(CMAKE_INSTALL_FULL_${dir} CMAKE_INSTALL_${dir} ${dir})
endforeach()
cmake_policy(POP)