try_run: Add tests for LINK_LIBRARIES with mock libraries.

Extend the ExportImport test to try using an imported library with
try_run.

Tests/ExportImport/Import/A/CMakeLists.txt

@@ -311,6 +311,21 @@ if (((CMAKE_C_COMPILER_ID STREQUAL GNU AND CMAKE_C_COMPILER_VERSION VERSION_GREA
       message(SEND_ERROR "EXP_ERROR_VARIABLE try_compile failed, but it was expected to succeed ${OUTPUT}.")
     endif()
 
+    if(NOT CMAKE_CROSSCOMPILING)
+      unset(EXP_RUN_VAR CACHE)
+      unset(EXP_COMPILE_VAR CACHE)
+      try_run(EXP_RUN_VAR EXP_COMPILE_VAR
+        "${CMAKE_CURRENT_SOURCE_DIR}/test_system"
+        "${CMAKE_CURRENT_SOURCE_DIR}/test_system.cpp"
+        COMPILE_DEFINITIONS "-Wunused-variable -Werror=unused-variable"
+        LINK_LIBRARIES exp_systemlib
+        OUTPUT_VARIABLE OUTPUT
+        )
+      if(NOT EXP_COMPILE_VAR)
+        message(SEND_ERROR "try_run compile failed, but it was expected to succeed ${OUTPUT}.")
+      endif()
+    endif()
+
     add_executable(test_system_bld test_system.cpp)
     target_link_libraries(test_system_bld bld_systemlib)
     target_compile_options(test_system_bld PRIVATE -Wunused-variable -Werror=unused-variable)
@@ -326,5 +341,20 @@ if (((CMAKE_C_COMPILER_ID STREQUAL GNU AND CMAKE_C_COMPILER_VERSION VERSION_GREA
     if(NOT BLD_ERROR_VARIABLE)
       message(SEND_ERROR "BLD_ERROR_VARIABLE try_compile failed, but it was expected to succeed.")
     endif()
+
+    if(NOT CMAKE_CROSSCOMPILING)
+      unset(BLD_RUN_VAR CACHE)
+      unset(BLD_COMPILE_VAR CACHE)
+      try_run(BLD_RUN_VAR BLD_COMPILE_VAR
+        "${CMAKE_CURRENT_SOURCE_DIR}/test_system"
+        "${CMAKE_CURRENT_SOURCE_DIR}/test_system.cpp"
+        COMPILE_DEFINITIONS "-Wunused-variable -Werror=unused-variable"
+        LINK_LIBRARIES bld_systemlib
+        OUTPUT_VARIABLE OUTPUT
+        )
+      if(NOT BLD_COMPILE_VAR)
+        message(SEND_ERROR "try_run compile failed, but it was expected to succeed ${OUTPUT}.")
+      endif()
+    endif()
   endif()
 endif()