Imported Upstream version 3.14.1upstream/3.14.1

1 files changed, 40 insertions, 30 deletions

diff --git a/Modules/CheckVariableExists.cmake b/Modules/CheckVariableExists.cmake
index ab456d14d..f4953a349 100644
--- a/Modules/CheckVariableExists.cmake
+++ b/Modules/CheckVariableExists.cmake
@@ -1,36 +1,39 @@
 # Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
 # file Copyright.txt or https://cmake.org/licensing for details.
 
-#.rst:
-# CheckVariableExists
-# -------------------
-#
-# Check if the variable exists.
-#
-# ::
-#
-#   CHECK_VARIABLE_EXISTS(VAR VARIABLE)
-#
-#
-#
-# ::
-#
-#   VAR      - the name of the variable
-#   VARIABLE - variable to store the result
-#              Will be created as an internal cache variable.
-#
-#
-# This macro is only for C variables.
-#
-# The following variables may be set before calling this macro to modify
-# the way the check is run:
-#
-# ::
-#
-#   CMAKE_REQUIRED_FLAGS = string of compile command line flags
-#   CMAKE_REQUIRED_DEFINITIONS = list of macros to define (-DFOO=bar)
-#   CMAKE_REQUIRED_LIBRARIES = list of libraries to link
-#   CMAKE_REQUIRED_QUIET = execute quietly without messages
+#[=======================================================================[.rst:
+CheckVariableExists
+-------------------
+
+Check if the variable exists.
+
+.. command:: CHECK_VARIABLE_EXISTS
+
+  .. code-block:: cmake
+
+    CHECK_VARIABLE_EXISTS(VAR VARIABLE)
+
+
+  ::
+
+    VAR      - the name of the variable
+    VARIABLE - variable to store the result
+               Will be created as an internal cache variable.
+
+
+  This macro is only for ``C`` variables.
+
+The following variables may be set before calling this macro to modify
+the way the check is run:
+
+::
+
+  CMAKE_REQUIRED_FLAGS = string of compile command line flags
+  CMAKE_REQUIRED_DEFINITIONS = list of macros to define (-DFOO=bar)
+  CMAKE_REQUIRED_LINK_OPTIONS = list of options to pass to link command
+  CMAKE_REQUIRED_LIBRARIES = list of libraries to link
+  CMAKE_REQUIRED_QUIET = execute quietly without messages
+#]=======================================================================]
 
 include_guard(GLOBAL)
 
@@ -41,6 +44,12 @@ macro(CHECK_VARIABLE_EXISTS VAR VARIABLE)
     if(NOT CMAKE_REQUIRED_QUIET)
       message(STATUS "Looking for ${VAR}")
     endif()
+    if(CMAKE_REQUIRED_LINK_OPTIONS)
+      set(CHECK_VARIABLE_EXISTS_ADD_LINK_OPTIONS
+        LINK_OPTIONS ${CMAKE_REQUIRED_LINK_OPTIONS})
+    else()
+      set(CHECK_VARIABLE_EXISTS_ADD_LINK_OPTIONS)
+    endif()
     if(CMAKE_REQUIRED_LIBRARIES)
       set(CHECK_VARIABLE_EXISTS_ADD_LIBRARIES
         LINK_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES})
@@ -51,6 +60,7 @@ macro(CHECK_VARIABLE_EXISTS VAR VARIABLE)
       ${CMAKE_BINARY_DIR}
       ${CMAKE_ROOT}/Modules/CheckVariableExists.c
       COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS}
+      ${CHECK_VARIABLE_EXISTS_ADD_LINK_OPTIONS}
       ${CHECK_VARIABLE_EXISTS_ADD_LIBRARIES}
       CMAKE_FLAGS -DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_VARIABLE_DEFINITIONS}
       OUTPUT_VARIABLE OUTPUT)