[CMake] Import latest AddInstallRPATHSupport from YCM

conf/AddInstallRPATHSupport.cmake

@@ -40,7 +40,7 @@
 # hardcode in the binary itself the additional search directories
 # to be passed to the dynamic linker. This works great in conjunction
 # with relative paths.
-# This macro will enable support to RPATH to your project.
+# This command will enable support to RPATH to your project.
 # It will enable the following things:
 #
 #  - If the project builds shared libraries it will generate a run-path
@@ -49,17 +49,18 @@
 #  - In all cases (building executables and/or shared libraries)
 #    dependent shared libraries with RPATH support will be properly
 #
-# The macro has the following parameters:
+# The command has the following parameters:
 #
 # Options:
-#  - ``USE_LINK_PATH``: if passed the macro will automatically adds to
+#  - ``USE_LINK_PATH``: if passed the command will automatically adds to
 #    the RPATH the path to all the dependent libraries.
 #
 # Arguments:
-#  - ``BIN_DIRS`` list of directories when the targets (bins or shared
-#    libraries) will be installed.
+#  - ``BIN_DIRS`` list of directories when the targets (executable and
+#    plugins) will be installed.
 #  - ``LIB_DIRS`` list of directories to be added to the RPATH. These
-#    directories will be added "relative" w.r.t. the ``BIN_DIRS``.
+#    directories will be added "relative" w.r.t. the ``BIN_DIRS`` and
+#    ``LIB_DIRS``.
 #  - ``DEPENDS`` list of conditions that should be TRUE to enable
 #    RPATH, for example ``FOO; NOT BAR``.
 
@@ -81,7 +82,12 @@
 include(CMakeParseArguments)
 
 
-macro(ADD_INSTALL_RPATH_SUPPORT)
+function(ADD_INSTALL_RPATH_SUPPORT)
+
+  # If RPATH is disabled in CMake, it is useless to proceed.
+  if(CMAKE_SKIP_RPATH OR (CMAKE_SKIP_INSTALL_RPATH AND CMAKE_SKIP_BUILD_RPATH))
+    return()
+  endif()
 
   set(_options USE_LINK_PATH)
   set(_oneValueArgs )
@@ -94,10 +100,8 @@ macro(ADD_INSTALL_RPATH_SUPPORT)
                              "${_multiValueArgs}"
                              "${ARGN}")
 
-  if(NOT DEFINED _ARS_DEPENDS)
-    set(_rpath_available 0)
-  else()
-    set(_rpath_available 1)
+  set(_rpath_available 1)
+  if(DEFINED _ARS_DEPENDS)
     foreach(_dep ${_ARS_DEPENDS})
       string(REGEX REPLACE " +" ";" _dep "${_dep}")
       if(NOT (${_dep}))
@@ -113,7 +117,13 @@ macro(ADD_INSTALL_RPATH_SUPPORT)
     endif()
 
     # Enable RPATH on OSX. This also suppress warnings on CMake >= 3.0
-    set(CMAKE_MACOSX_RPATH TRUE)
+    set(CMAKE_MACOSX_RPATH TRUE PARENT_SCOPE)
+
+    # If install RPATH is disabled in CMake, it is useless to evaluate and set
+    # CMAKE_INSTALL_RPATH and CMAKE_INSTALL_RPATH_USE_LINK_PATH
+    if(CMAKE_SKIP_INSTALL_RPATH)
+      return()
+    endif()
 
     # Find system implicit lib directories
     set(_system_lib_dirs ${CMAKE_PLATFORM_IMPLICIT_LINK_DIRECTORIES})
@@ -127,7 +137,7 @@ macro(ADD_INSTALL_RPATH_SUPPORT)
     foreach(lib_dir ${_ARS_LIB_DIRS})
       list(FIND _system_lib_dirs "${lib_dir}" isSystemDir)
       if("${isSystemDir}" STREQUAL "-1")
-        foreach(bin_dir ${_ARS_BIN_DIRS})
+        foreach(bin_dir ${_ARS_LIB_DIRS} ${_ARS_BIN_DIRS})
           file(RELATIVE_PATH _rel_path ${bin_dir} ${lib_dir})
           if (${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
             list(APPEND CMAKE_INSTALL_RPATH "@loader_path/${_rel_path}")
@@ -138,16 +148,12 @@ macro(ADD_INSTALL_RPATH_SUPPORT)
       endif("${isSystemDir}" STREQUAL "-1")
     endforeach()
     list(REMOVE_DUPLICATES CMAKE_INSTALL_RPATH)
-
-    unset(_rel_path)
-    unset(_system_lib_dirs)
+    set(CMAKE_INSTALL_RPATH ${CMAKE_INSTALL_RPATH} PARENT_SCOPE)
 
     # add the automatically determined parts of the RPATH
     # which point to directories outside the build tree to the install RPATH
-    set(CMAKE_INSTALL_RPATH_USE_LINK_PATH ${_ARS_USE_LINK_PATH})
-  endif()
+    set(CMAKE_INSTALL_RPATH_USE_LINK_PATH ${_ARS_USE_LINK_PATH} PARENT_SCOPE)
 
-  unset(_rpath_available)
-  unset(_dep)
+  endif()
 
-endmacro()
+endfunction()