Merge pull request #483 from joy4eg/install-dirs-dev

cmake: removed hardcoded names for top level configuration

Author: daanx

CMakeLists.txt

@@ -25,6 +25,7 @@ option(MI_CHECK_FULL        "Use full internal invariant checking in DEBUG mode
 option(MI_INSTALL_TOPLEVEL  "Install directly into $CMAKE_INSTALL_PREFIX instead of PREFIX/lib/mimalloc-version" OFF)
 option(MI_USE_LIBATOMIC     "Explicitly link with -latomic (on older systems)" OFF)
 
+include(GNUInstallDirs)
 include("cmake/mimalloc-config-version.cmake")
 
 set(mi_sources
@@ -230,9 +231,9 @@ endif()
 # -----------------------------------------------------------------------------
 
 if (MI_INSTALL_TOPLEVEL)
-  set(mi_install_libdir   "lib")
-  set(mi_install_incdir   "include")
-  set(mi_install_cmakedir "cmake")
+  set(mi_install_libdir   "${CMAKE_INSTALL_LIBDIR}")
+  set(mi_install_incdir   "${CMAKE_INSTALL_INCLUDEDIR}")
+  set(mi_install_cmakedir "${CMAKE_INSTALL_LIBDIR}/cmake/mimalloc")
 else()
   set(mi_install_libdir   "lib/mimalloc-${mi_version}")
   set(mi_install_incdir   "include/mimalloc-${mi_version}")