Append BOOST_INSTALL_INCLUDE_SUBDIR onto CMAKE_INSTALL_DATADIR

Author: k3DW

README.md

@@ -125,6 +125,11 @@ or `cmake-gui`:
   Directory in which to install the compiled libraries. Can be relative to
   `CMAKE_INSTALL_PREFIX`. Default `lib`.
 
+* [`CMAKE_INSTALL_DATADIR`](https://cmake.org/cmake/help/latest/module/GNUInstallDirs.html)
+
+  Directory in which to install the data files (e.g. debugger visualizers).
+  Can be relative to `CMAKE_INSTALL_PREFIX`. Default `share`.
+
 * `BOOST_INSTALL_CMAKEDIR`
 
   Directory in which to install the CMake configuration files. Default `lib/cmake`.
@@ -150,9 +155,10 @@ or `cmake-gui`:
 * `BOOST_INSTALL_INCLUDE_SUBDIR`
 
   When `BOOST_INSTALL_LAYOUT` is `versioned`, headers are installed in a
-  subdirectory of `CMAKE_INSTALL_INCLUDEDIR` (to enable several Boost releases
-  being installed at the same time.) The default for release e.g. 1.81 is
-  `/boost-1_81`.)
+  subdirectory of `CMAKE_INSTALL_INCLUDEDIR` and data files are installed
+  in a subdirectory of `CMAKE_INSTALL_DATADIR` (to enable several Boost
+  releases being installed at the same time.) The default for release e.g.
+  1.81 is `/boost-1_81`.)
 
 * `BOOST_RUNTIME_LINK`
 

include/BoostInstall.cmake

@@ -29,7 +29,7 @@ if(CMAKE_SOURCE_DIR STREQUAL "${BOOST_SUPERPROJECT_SOURCE_DIR}")
   set_property(CACHE BOOST_INSTALL_LAYOUT PROPERTY STRINGS versioned tagged system)
 
   set(BOOST_INSTALL_CMAKEDIR "${__boost_default_cmakedir}" CACHE STRING "Installation directory for CMake configuration files")
-  set(BOOST_INSTALL_INCLUDE_SUBDIR "${__boost_default_include_subdir}" CACHE STRING "Header subdirectory when layout is versioned")
+  set(BOOST_INSTALL_INCLUDE_SUBDIR "${__boost_default_include_subdir}" CACHE STRING "Header and data subdirectory when layout is versioned")
 
 else()
 
@@ -51,6 +51,7 @@ endif()
 
 if(BOOST_INSTALL_LAYOUT STREQUAL "versioned")
   string(APPEND CMAKE_INSTALL_INCLUDEDIR "${BOOST_INSTALL_INCLUDE_SUBDIR}")
+  string(APPEND CMAKE_INSTALL_DATADIR "${BOOST_INSTALL_INCLUDE_SUBDIR}")
 endif()
 
 #