Imported Upstream version 3.9.4upstream/3.9.4

1 files changed, 288 insertions, 103 deletions

diff --git a/Modules/GNUInstallDirs.cmake b/Modules/GNUInstallDirs.cmake
index 0302e4bef..64bd09e68 100644
--- a/Modules/GNUInstallDirs.cmake
+++ b/Modules/GNUInstallDirs.cmake
@@ -1,74 +1,202 @@
-# - Define GNU standard installation directories
-# Provides install directory variables as defined for GNU software:
-#  http://www.gnu.org/prep/standards/html_node/Directory-Variables.html
-# Inclusion of this module defines the following variables:
-#  CMAKE_INSTALL_<dir>      - destination for files of a given type
-#  CMAKE_INSTALL_FULL_<dir> - corresponding absolute path
-# 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)
-#  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)
-# Each CMAKE_INSTALL_<dir> value may be passed to the DESTINATION options of
-# install() commands for the corresponding file type.  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.
-# Each CMAKE_INSTALL_FULL_<dir> value contains an absolute path constructed
-# from the corresponding destination by prepending (if necessary) the value
-# of CMAKE_INSTALL_PREFIX.
-
-#=============================================================================
-# Copyright 2011 Nikita Krupen'ko <krnekit@gmail.com>
-# Copyright 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.)
+# Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+# file Copyright.txt or https://cmake.org/licensing for details.
 
-# Installation directories
+#.rst:
+# GNUInstallDirs
+# --------------
 #
-if(NOT DEFINED CMAKE_INSTALL_BINDIR)
-  set(CMAKE_INSTALL_BINDIR "bin" CACHE PATH "user executables (bin)")
-endif()
+# 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.
+#
+# ``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``
+#   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
+# ^^^^^^^^^^^^^
+#
+# 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)
+#
+#   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.
 
-if(NOT DEFINED CMAKE_INSTALL_SBINDIR)
-  set(CMAKE_INSTALL_SBINDIR "sbin" CACHE PATH "system admin executables (sbin)")
-endif()
+# Convert a cache variable to PATH type
 
-if(NOT DEFINED CMAKE_INSTALL_LIBEXECDIR)
-  set(CMAKE_INSTALL_LIBEXECDIR "libexec" CACHE PATH "program executables (libexec)")
-endif()
+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()
 
-if(NOT DEFINED CMAKE_INSTALL_SYSCONFDIR)
-  set(CMAKE_INSTALL_SYSCONFDIR "etc" CACHE PATH "read-only single-machine data (etc)")
-endif()
+# 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()
 
-if(NOT DEFINED CMAKE_INSTALL_SHAREDSTATEDIR)
-  set(CMAKE_INSTALL_SHAREDSTATEDIR "com" CACHE PATH "modifiable architecture-independent data (com)")
-endif()
+# 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()
 
-if(NOT DEFINED CMAKE_INSTALL_LOCALSTATEDIR)
-  set(CMAKE_INSTALL_LOCALSTATEDIR "var" CACHE PATH "modifiable single-machine data (var)")
-endif()
+# 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.
 
-if(NOT DEFINED CMAKE_INSTALL_LIBDIR)
   set(_LIBDIR_DEFAULT "lib")
   # Override this default 'lib' with 'lib64' iff:
   #  - we are on Linux system but NOT cross-compiling
@@ -77,13 +205,30 @@ if(NOT DEFINED CMAKE_INSTALL_LIBDIR)
   # reason is: amd64 ABI: http://www.x86-64.org/documentation/abi.pdf
   # For Debian with multiarch, use 'lib/${CMAKE_LIBRARY_ARCHITECTURE}' if
   # CMAKE_LIBRARY_ARCHITECTURE is set (which contains e.g. "i386-linux-gnu"
+  # and CMAKE_INSTALL_PREFIX is "/usr"
   # See http://wiki.debian.org/Multiarch
-  if(CMAKE_SYSTEM_NAME MATCHES "Linux"
+  if(DEFINED _GNUInstallDirs_LAST_CMAKE_INSTALL_PREFIX)
+    set(__LAST_LIBDIR_DEFAULT "lib")
+    # __LAST_LIBDIR_DEFAULT is the default value that we compute from
+    # _GNUInstallDirs_LAST_CMAKE_INSTALL_PREFIX, not a cache entry for
+    # the value that was last used as the default.
+    # This value is used to figure out whether the user changed the
+    # CMAKE_INSTALL_LIBDIR value manually, or if the value was the
+    # default one. When CMAKE_INSTALL_PREFIX changes, the value is
+    # updated to the new default, unless the user explicitly changed it.
+  endif()
+  if(CMAKE_SYSTEM_NAME MATCHES "^(Linux|kFreeBSD|GNU)$"
       AND NOT CMAKE_CROSSCOMPILING)
     if (EXISTS "/etc/debian_version") # is this a debian system ?
-       if(CMAKE_LIBRARY_ARCHITECTURE)
-         set(_LIBDIR_DEFAULT "lib/${CMAKE_LIBRARY_ARCHITECTURE}")
-       endif()
+      if(CMAKE_LIBRARY_ARCHITECTURE)
+        if("${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/${CMAKE_LIBRARY_ARCHITECTURE}")
+        endif()
+      endif()
     else() # not debian, rely on CMAKE_SIZEOF_VOID_P:
       if(NOT DEFINED CMAKE_SIZEOF_VOID_P)
         message(AUTHOR_WARNING
@@ -92,54 +237,61 @@ if(NOT DEFINED CMAKE_INSTALL_LIBDIR)
       else()
         if("${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()
   endif()
-  set(CMAKE_INSTALL_LIBDIR "${_LIBDIR_DEFAULT}" CACHE PATH "object code libraries (${_LIBDIR_DEFAULT})")
-endif()
-
-if(NOT DEFINED CMAKE_INSTALL_INCLUDEDIR)
-  set(CMAKE_INSTALL_INCLUDEDIR "include" CACHE PATH "C header files (include)")
+  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)")
 
-if(NOT DEFINED CMAKE_INSTALL_OLDINCLUDEDIR)
-  set(CMAKE_INSTALL_OLDINCLUDEDIR "/usr/include" CACHE PATH "C header files for non-gcc (/usr/include)")
-endif()
+# 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)
 
-if(NOT DEFINED CMAKE_INSTALL_DATAROOTDIR)
-  set(CMAKE_INSTALL_DATAROOTDIR "share" CACHE PATH "read-only architecture-independent data root (share)")
-endif()
+_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.
 
-if(NOT CMAKE_INSTALL_DATADIR)
-  set(CMAKE_INSTALL_DATADIR "" CACHE PATH "read-only architecture-independent data (DATAROOTDIR)")
-  set(CMAKE_INSTALL_DATADIR "${CMAKE_INSTALL_DATAROOTDIR}")
-endif()
-
-if(NOT CMAKE_INSTALL_INFODIR)
-  set(CMAKE_INSTALL_INFODIR "" CACHE PATH "info documentation (DATAROOTDIR/info)")
-  set(CMAKE_INSTALL_INFODIR "${CMAKE_INSTALL_DATAROOTDIR}/info")
-endif()
+_GNUInstallDirs_cache_path_fallback(CMAKE_INSTALL_DATADIR "${CMAKE_INSTALL_DATAROOTDIR}"
+  "Read-only architecture-independent data (DATAROOTDIR)")
 
-if(NOT CMAKE_INSTALL_LOCALEDIR)
-  set(CMAKE_INSTALL_LOCALEDIR "" CACHE PATH "locale-dependent data (DATAROOTDIR/locale)")
-  set(CMAKE_INSTALL_LOCALEDIR "${CMAKE_INSTALL_DATAROOTDIR}/locale")
+if(CMAKE_SYSTEM_NAME MATCHES "^(.*BSD|DragonFly)$")
+  _GNUInstallDirs_cache_path_fallback(CMAKE_INSTALL_INFODIR "info"
+    "Info documentation (info)")
+  _GNUInstallDirs_cache_path_fallback(CMAKE_INSTALL_MANDIR "man"
+    "Man documentation (man)")
+else()
+  _GNUInstallDirs_cache_path_fallback(CMAKE_INSTALL_INFODIR "${CMAKE_INSTALL_DATAROOTDIR}/info"
+    "Info documentation (DATAROOTDIR/info)")
+  _GNUInstallDirs_cache_path_fallback(CMAKE_INSTALL_MANDIR "${CMAKE_INSTALL_DATAROOTDIR}/man"
+    "Man documentation (DATAROOTDIR/man)")
 endif()
 
-if(NOT CMAKE_INSTALL_MANDIR)
-  set(CMAKE_INSTALL_MANDIR "" CACHE PATH "man documentation (DATAROOTDIR/man)")
-  set(CMAKE_INSTALL_MANDIR "${CMAKE_INSTALL_DATAROOTDIR}/man")
-endif()
+_GNUInstallDirs_cache_path_fallback(CMAKE_INSTALL_LOCALEDIR "${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)")
 
-if(NOT CMAKE_INSTALL_DOCDIR)
-  set(CMAKE_INSTALL_DOCDIR "" CACHE PATH "documentation root (DATAROOTDIR/doc/PROJECT_NAME)")
-  set(CMAKE_INSTALL_DOCDIR "${CMAKE_INSTALL_DATAROOTDIR}/doc/${PROJECT_NAME}")
-endif()
+_GNUInstallDirs_cache_path_fallback(CMAKE_INSTALL_RUNSTATEDIR "${CMAKE_INSTALL_LOCALSTATEDIR}/run"
+  "Run-time variable data (LOCALSTATEDIR/run)")
 
 #-----------------------------------------------------------------------------
 
@@ -150,6 +302,7 @@ mark_as_advanced(
   CMAKE_INSTALL_SYSCONFDIR
   CMAKE_INSTALL_SHAREDSTATEDIR
   CMAKE_INSTALL_LOCALSTATEDIR
+  CMAKE_INSTALL_RUNSTATEDIR
   CMAKE_INSTALL_LIBDIR
   CMAKE_INSTALL_INCLUDEDIR
   CMAKE_INSTALL_OLDINCLUDEDIR
@@ -161,6 +314,41 @@ mark_as_advanced(
   CMAKE_INSTALL_DOCDIR
   )
 
+macro(GNUInstallDirs_get_absolute_install_dir absvar var)
+  if(NOT IS_ABSOLUTE "${${var}}")
+    # Handle special cases:
+    # - CMAKE_INSTALL_PREFIX == /
+    # - CMAKE_INSTALL_PREFIX == /usr
+    # - CMAKE_INSTALL_PREFIX == /opt/...
+    if("${CMAKE_INSTALL_PREFIX}" STREQUAL "/")
+      if("${dir}" STREQUAL "SYSCONFDIR" OR "${dir}" STREQUAL "LOCALSTATEDIR" OR "${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/?$")
+      if("${dir}" STREQUAL "SYSCONFDIR" OR "${dir}" STREQUAL "LOCALSTATEDIR" OR "${dir}" STREQUAL "RUNSTATEDIR")
+        set(${absvar} "/${${var}}")
+      else()
+        set(${absvar} "${CMAKE_INSTALL_PREFIX}/${${var}}")
+      endif()
+    elseif("${CMAKE_INSTALL_PREFIX}" MATCHES "^/opt/.*")
+      if("${dir}" STREQUAL "SYSCONFDIR" OR "${dir}" STREQUAL "LOCALSTATEDIR" OR "${dir}" STREQUAL "RUNSTATEDIR")
+        set(${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()
+endmacro()
+
 # Result directories
 #
 foreach(dir
@@ -170,6 +358,7 @@ foreach(dir
     SYSCONFDIR
     SHAREDSTATEDIR
     LOCALSTATEDIR
+    RUNSTATEDIR
     LIBDIR
     INCLUDEDIR
     OLDINCLUDEDIR
@@ -180,9 +369,5 @@ foreach(dir
     MANDIR
     DOCDIR
     )
-  if(NOT IS_ABSOLUTE ${CMAKE_INSTALL_${dir}})
-    set(CMAKE_INSTALL_FULL_${dir} "${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_${dir}}")
-  else()
-    set(CMAKE_INSTALL_FULL_${dir} "${CMAKE_INSTALL_${dir}}")
-  endif()
+  GNUInstallDirs_get_absolute_install_dir(CMAKE_INSTALL_FULL_${dir} CMAKE_INSTALL_${dir})
 endforeach()