cmake_language: Add signature to DEFER calls to later times

Fixes: #19575

125 files changed, 417 insertions, 0 deletions

diff --git a/Tests/RunCMake/cmake_language/RunCMakeTest.cmake b/Tests/RunCMake/cmake_language/RunCMakeTest.cmake
index 29a4d23..6480b2e 100644
--- a/Tests/RunCMake/cmake_language/RunCMakeTest.cmake
+++ b/Tests/RunCMake/cmake_language/RunCMakeTest.cmake
@@ -32,3 +32,53 @@ run_cmake(eval_message_fatal_error)
 run_cmake(eval_no_code)
 run_cmake(eval_no_parameters)
 run_cmake(eval_variable_outside_message)
+run_cmake(defer_call)
+run_cmake(defer_call_add_subdirectory)
+run_cmake(defer_call_enable_language)
+run_cmake(defer_call_ids)
+foreach(command IN ITEMS
+    "function" "endfunction"
+    "macro" "endmacro"
+    "if" "elseif" "else" "endif"
+    "while" "endwhile"
+    "foreach" "endforeach"
+    "return"
+    )
+  message(STATUS "Running defer_call_invalid_command for ${command}...")
+  run_cmake_with_options(defer_call_invalid_command -Dcommand=${command})
+endforeach()
+run_cmake(defer_call_invalid_directory)
+run_cmake(defer_call_error)
+run_cmake(defer_call_missing_directory)
+run_cmake(defer_call_policy_PUSH)
+run_cmake(defer_call_syntax_error)
+run_cmake_with_options(defer_call_trace --trace-expand)
+run_cmake_with_options(defer_call_trace_json --trace --trace-format=json-v1)
+run_cmake(defer_cancel_call_unknown_argument)
+run_cmake(defer_cancel_call_invalid_directory)
+run_cmake(defer_cancel_call_id)
+run_cmake(defer_cancel_call_id_var)
+run_cmake(defer_directory_empty)
+run_cmake(defer_directory_missing)
+run_cmake(defer_directory_multiple)
+run_cmake(defer_id_empty)
+run_cmake(defer_id_missing)
+run_cmake(defer_id_multiple)
+run_cmake(defer_id_var_empty)
+run_cmake(defer_id_var_missing)
+run_cmake(defer_id_var_multiple)
+run_cmake(defer_get_call_ids_missing_var)
+run_cmake(defer_get_call_ids_too_many_args)
+run_cmake(defer_get_call_ids_invalid_directory)
+run_cmake(defer_get_call_ids_id)
+run_cmake(defer_get_call_ids_id_var)
+run_cmake(defer_get_call_missing_id)
+run_cmake(defer_get_call_missing_var)
+run_cmake(defer_get_call_too_many_args)
+run_cmake(defer_get_call_id_empty)
+run_cmake(defer_get_call_unknown_argument)
+run_cmake(defer_get_call_id)
+run_cmake(defer_get_call_id_var)
+run_cmake(defer_missing_arg)
+run_cmake(defer_missing_call)
+run_cmake(defer_unknown_option)
diff --git a/Tests/RunCMake/cmake_language/defer_call-stderr.txt b/Tests/RunCMake/cmake_language/defer_call-stderr.txt
new file mode 100644
index 0000000..7e8d8ca
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_call-stderr.txt
@@ -0,0 +1,15 @@
+^CMake Deprecation Warning at defer_call/CMakeLists.txt:[0-9]+ \(cmake_policy\):
+  The OLD behavior for policy CMP0053 will be removed from a future version
+  of CMake.
+
+  The cmake-policies\(7\) manual explains that the OLD behaviors of all
+  policies are deprecated and that a policy should be set to OLD only under
+  specific short-term circumstances.  Projects should be ported to the NEW
+  behavior and not rely on setting a policy to OLD.
++
+CMake Warning at defer_call/CMakeLists.txt:3 \(message\):
+  Double-Deferred Warning In Subdirectory:
+
+   '[^']*/Tests/RunCMake/cmake_language/defer_call/CMakeLists.txt:DEFERRED:id3'
+Call Stack \(most recent call first\):
+  defer_call/CMakeLists.txt:DEFERRED$
diff --git a/Tests/RunCMake/cmake_language/defer_call-stdout.txt b/Tests/RunCMake/cmake_language/defer_call-stdout.txt
new file mode 100644
index 0000000..fcf9f29
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_call-stdout.txt
@@ -0,0 +1,8 @@
+-- Immediate Message In Subdirectory: ids='__0;__1'
+-- Deferred Message In Subdirectory: '[^']*/Tests/RunCMake/cmake_language/defer_call/CMakeLists.txt:DEFERRED:id1'
+-- Deferred Message In Included File: '[^']*/Tests/RunCMake/cmake_language/defer_call/include.cmake:1'
+-- Immediate Message: ids='__0;__1;__2;__3;__4'
+-- First Deferred Message
+-- Deferred Message From Subdirectory
+-- Deferred Message: ids='__4;__5'
+-- Final Deferred Message
diff --git a/Tests/RunCMake/cmake_language/defer_call.cmake b/Tests/RunCMake/cmake_language/defer_call.cmake
new file mode 100644
index 0000000..2e9595f
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_call.cmake
@@ -0,0 +1,12 @@
+set(message_command "message")
+set(final_message "This should not be printed because variable evaluation is deferred too.")
+cmake_language(DEFER CALL ${message_command} STATUS "First Deferred Message")
+add_subdirectory(defer_call)
+cmake_language(DEFER CALL cmake_language DEFER CALL "${final_message_command}" STATUS "${final_message}")
+cmake_language(DEFER CALL cmake_language DEFER GET_CALL_IDS ids)
+cmake_language(DEFER CALL cmake_language EVAL CODE [[message(STATUS "Deferred Message: ids='${ids}'")]])
+cmake_language(DEFER GET_CALL_IDS ids)
+message(STATUS "Immediate Message: ids='${ids}'")
+set(final_message_command "message")
+set(final_message "Final Deferred Message")
+set(subdir_message "Deferred Message From Subdirectory")
diff --git a/Tests/RunCMake/cmake_language/defer_call/CMakeLists.txt b/Tests/RunCMake/cmake_language/defer_call/CMakeLists.txt
new file mode 100644
index 0000000..544b9f4
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_call/CMakeLists.txt
@@ -0,0 +1,11 @@
+cmake_policy(SET CMP0053 OLD)
+cmake_language(DEFER ID id1 CALL message STATUS "Deferred Message In Subdirectory: '${CMAKE_CURRENT_LIST_FILE}:${CMAKE_CURRENT_LIST_LINE}'")
+cmake_language(DEFER ID id2 CALL
+  cmake_language DEFER ID id3 CALL
+  message WARNING "Double-Deferred Warning In Subdirectory:\n '${CMAKE_CURRENT_LIST_FILE}:${CMAKE_CURRENT_LIST_LINE}'")
+cmake_language(DEFER ID id4 CALL include "${CMAKE_CURRENT_LIST_DIR}/include.cmake")
+
+set(subdir_message "This should not be printed because variable evaluation is in deferred scope.")
+cmake_language(DEFER DIRECTORY .. CALL message STATUS "${subdir_message}")
+cmake_language(DEFER DIRECTORY .. GET_CALL_IDS ids)
+message(STATUS "Immediate Message In Subdirectory: ids='${ids}'")
diff --git a/Tests/RunCMake/cmake_language/defer_call/include.cmake b/Tests/RunCMake/cmake_language/defer_call/include.cmake
new file mode 100644
index 0000000..272c61b
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_call/include.cmake
@@ -0,0 +1 @@
+message(STATUS "Deferred Message In Included File: '${CMAKE_CURRENT_LIST_FILE}:${CMAKE_CURRENT_LIST_LINE}'")
diff --git a/Tests/RunCMake/cmake_language/defer_call_add_subdirectory-result.txt b/Tests/RunCMake/cmake_language/defer_call_add_subdirectory-result.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_call_add_subdirectory-result.txt
@@ -0,0 +1 @@
+1
diff --git a/Tests/RunCMake/cmake_language/defer_call_add_subdirectory-stderr.txt b/Tests/RunCMake/cmake_language/defer_call_add_subdirectory-stderr.txt
new file mode 100644
index 0000000..ec20b8f
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_call_add_subdirectory-stderr.txt
@@ -0,0 +1,9 @@
+^CMake Error at defer_call_add_subdirectory.cmake:1 \(add_subdirectory\):
+  Subdirectories may not be created during deferred execution.
+Call Stack \(most recent call first\):
+  CMakeLists.txt:DEFERRED
++
+CMake Error at defer_call_add_subdirectory.cmake:2 \(subdirs\):
+  Subdirectories may not be created during deferred execution.
+Call Stack \(most recent call first\):
+  CMakeLists.txt:DEFERRED$
diff --git a/Tests/RunCMake/cmake_language/defer_call_add_subdirectory.cmake b/Tests/RunCMake/cmake_language/defer_call_add_subdirectory.cmake
new file mode 100644
index 0000000..6b7ee63
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_call_add_subdirectory.cmake
@@ -0,0 +1,2 @@
+cmake_language(DEFER CALL add_subdirectory defer_call_add_subdirectory)
+cmake_language(DEFER CALL subdirs defer_call_add_subdirectory)
diff --git a/Tests/RunCMake/cmake_language/defer_call_add_subdirectory/CMakeLists.txt b/Tests/RunCMake/cmake_language/defer_call_add_subdirectory/CMakeLists.txt
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_call_add_subdirectory/CMakeLists.txt
diff --git a/Tests/RunCMake/cmake_language/defer_call_enable_language-result.txt b/Tests/RunCMake/cmake_language/defer_call_enable_language-result.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_call_enable_language-result.txt
@@ -0,0 +1 @@
+1
diff --git a/Tests/RunCMake/cmake_language/defer_call_enable_language-stderr.txt b/Tests/RunCMake/cmake_language/defer_call_enable_language-stderr.txt
new file mode 100644
index 0000000..65a0b99
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_call_enable_language-stderr.txt
@@ -0,0 +1,9 @@
+^CMake Error at defer_call_enable_language.cmake:1 \(enable_language\):
+  Languages may not be enabled during deferred execution.
+Call Stack \(most recent call first\):
+  CMakeLists.txt:DEFERRED
++
+CMake Error at defer_call_enable_language.cmake:2 \(project\):
+  Languages may not be enabled during deferred execution.
+Call Stack \(most recent call first\):
+  CMakeLists.txt:DEFERRED$
diff --git a/Tests/RunCMake/cmake_language/defer_call_enable_language.cmake b/Tests/RunCMake/cmake_language/defer_call_enable_language.cmake
new file mode 100644
index 0000000..eb43f80
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_call_enable_language.cmake
@@ -0,0 +1,2 @@
+cmake_language(DEFER CALL enable_language C)
+cmake_language(DEFER CALL project foo C)
diff --git a/Tests/RunCMake/cmake_language/defer_call_error-result.txt b/Tests/RunCMake/cmake_language/defer_call_error-result.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_call_error-result.txt
@@ -0,0 +1 @@
+1
diff --git a/Tests/RunCMake/cmake_language/defer_call_error-stderr.txt b/Tests/RunCMake/cmake_language/defer_call_error-stderr.txt
new file mode 100644
index 0000000..63ce145
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_call_error-stderr.txt
@@ -0,0 +1,9 @@
+^CMake Error at defer_call_error.cmake:2 \(message\):
+  Deferred Error
+Call Stack \(most recent call first\):
+  CMakeLists.txt:DEFERRED
++
+CMake Error at defer_call_error/CMakeLists.txt:2 \(message\):
+  Deferred Error from Subdirectory
+Call Stack \(most recent call first\):
+  CMakeLists.txt:DEFERRED$
diff --git a/Tests/RunCMake/cmake_language/defer_call_error.cmake b/Tests/RunCMake/cmake_language/defer_call_error.cmake
new file mode 100644
index 0000000..083e82a
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_call_error.cmake
@@ -0,0 +1,3 @@
+# Error message backtrace points here but call stack shows DEFERRED execution.
+cmake_language(DEFER CALL message SEND_ERROR "Deferred Error")
+add_subdirectory(defer_call_error)
diff --git a/Tests/RunCMake/cmake_language/defer_call_error/CMakeLists.txt b/Tests/RunCMake/cmake_language/defer_call_error/CMakeLists.txt
new file mode 100644
index 0000000..0acac69
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_call_error/CMakeLists.txt
@@ -0,0 +1,2 @@
+# Error message backtrace points here but call stack shows DEFERRED execution in parent.
+cmake_language(DEFER DIRECTORY .. CALL message SEND_ERROR "Deferred Error from Subdirectory")
diff --git a/Tests/RunCMake/cmake_language/defer_call_ids-stdout.txt b/Tests/RunCMake/cmake_language/defer_call_ids-stdout.txt
new file mode 100644
index 0000000..2fd194d
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_call_ids-stdout.txt
@@ -0,0 +1,13 @@
+-- Immediate Message: ids='message0;getCallIds1;messageIds1;cancelCall;getCallIds2;messageIds2;toBeCancelled;message3'
+-- Immediate Message: message0='message;STATUS;First Deferred Message'
+-- Immediate Message: getCallIds1='cmake_language;DEFER;GET_CALL_IDS;ids'
+-- Immediate Message: messageIds1='cmake_language;EVAL;CODE;message\(STATUS "Deferred Message: ids='\${ids}'"\)'
+-- Immediate Message: cancelCall='cmake_language;DEFER;CANCEL_CALL;toBeCancelled'
+-- Immediate Message: getCallIds2='cmake_language;DEFER;GET_CALL_IDS;ids'
+-- Immediate Message: messageIds2='cmake_language;EVAL;CODE;message\(STATUS "Deferred Message: ids='\${ids}'"\)'
+-- Immediate Message: toBeCancelled='message;STATUS;Cancelled Message'
+-- Immediate Message: message3='message;STATUS;Final Deferred Message'
+-- First Deferred Message
+-- Deferred Message: ids='messageIds1;cancelCall;getCallIds2;messageIds2;toBeCancelled;message3'
+-- Deferred Message: ids='messageIds2;message3'
+-- Final Deferred Message
diff --git a/Tests/RunCMake/cmake_language/defer_call_ids.cmake b/Tests/RunCMake/cmake_language/defer_call_ids.cmake
new file mode 100644
index 0000000..2874894
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_call_ids.cmake
@@ -0,0 +1,14 @@
+cmake_language(DEFER ID message0 CALL message STATUS "First Deferred Message")
+cmake_language(DEFER ID getCallIds1 CALL cmake_language DEFER GET_CALL_IDS ids)
+cmake_language(DEFER ID messageIds1 CALL cmake_language EVAL CODE [[message(STATUS "Deferred Message: ids='${ids}'")]])
+cmake_language(DEFER ID cancelCall CALL cmake_language DEFER CANCEL_CALL toBeCancelled)
+cmake_language(DEFER ID getCallIds2 CALL cmake_language DEFER GET_CALL_IDS ids)
+cmake_language(DEFER ID messageIds2 CALL cmake_language EVAL CODE [[message(STATUS "Deferred Message: ids='${ids}'")]])
+cmake_language(DEFER ID toBeCancelled CALL message STATUS "Cancelled Message")
+cmake_language(DEFER ID message3 CALL message STATUS "Final Deferred Message")
+cmake_language(DEFER GET_CALL_IDS ids)
+message(STATUS "Immediate Message: ids='${ids}'")
+foreach(id ${ids})
+  cmake_language(DEFER GET_CALL ${id} call)
+  message(STATUS "Immediate Message: ${id}='${call}'")
+endforeach()
diff --git a/Tests/RunCMake/cmake_language/defer_call_invalid_command-result.txt b/Tests/RunCMake/cmake_language/defer_call_invalid_command-result.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_call_invalid_command-result.txt
@@ -0,0 +1 @@
+1
diff --git a/Tests/RunCMake/cmake_language/defer_call_invalid_command-stderr.txt b/Tests/RunCMake/cmake_language/defer_call_invalid_command-stderr.txt
new file mode 100644
index 0000000..4cdbf0c
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_call_invalid_command-stderr.txt
@@ -0,0 +1,4 @@
+^CMake Error at defer_call_invalid_command.cmake:1 \(cmake_language\):
+  cmake_language invalid command specified: [A-Za-z_]+
+Call Stack \(most recent call first\):
+  CMakeLists.txt:3 \(include\)$
diff --git a/Tests/RunCMake/cmake_language/defer_call_invalid_command.cmake b/Tests/RunCMake/cmake_language/defer_call_invalid_command.cmake
new file mode 100644
index 0000000..d6cc936
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_call_invalid_command.cmake
@@ -0,0 +1 @@
+cmake_language(DEFER CALL ${command})
diff --git a/Tests/RunCMake/cmake_language/defer_call_invalid_directory-result.txt b/Tests/RunCMake/cmake_language/defer_call_invalid_directory-result.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_call_invalid_directory-result.txt
@@ -0,0 +1 @@
+1
diff --git a/Tests/RunCMake/cmake_language/defer_call_invalid_directory-stderr.txt b/Tests/RunCMake/cmake_language/defer_call_invalid_directory-stderr.txt
new file mode 100644
index 0000000..afe9a0e
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_call_invalid_directory-stderr.txt
@@ -0,0 +1,9 @@
+^CMake Error at defer_call_invalid_directory.cmake:2 \(cmake_language\):
+  cmake_language DEFER CALL may not be scheduled in directory:
+
+    [^
+]*/Tests/RunCMake/cmake_language/defer_call_invalid_directory-build/defer_call_invalid_directory
+
+  at this time.
+Call Stack \(most recent call first\):
+  CMakeLists.txt:3 \(include\)$
diff --git a/Tests/RunCMake/cmake_language/defer_call_invalid_directory.cmake b/Tests/RunCMake/cmake_language/defer_call_invalid_directory.cmake
new file mode 100644
index 0000000..cc1eb8d
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_call_invalid_directory.cmake
@@ -0,0 +1,2 @@
+add_subdirectory(defer_call_invalid_directory)
+cmake_language(DEFER DIRECTORY defer_call_invalid_directory CALL message "Should not be allowed.")
diff --git a/Tests/RunCMake/cmake_language/defer_call_invalid_directory/CMakeLists.txt b/Tests/RunCMake/cmake_language/defer_call_invalid_directory/CMakeLists.txt
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_call_invalid_directory/CMakeLists.txt
diff --git a/Tests/RunCMake/cmake_language/defer_call_missing_directory-result.txt b/Tests/RunCMake/cmake_language/defer_call_missing_directory-result.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_call_missing_directory-result.txt
@@ -0,0 +1 @@
+1
diff --git a/Tests/RunCMake/cmake_language/defer_call_missing_directory-stderr.txt b/Tests/RunCMake/cmake_language/defer_call_missing_directory-stderr.txt
new file mode 100644
index 0000000..db4f90e
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_call_missing_directory-stderr.txt
@@ -0,0 +1,9 @@
+^CMake Error at defer_call_missing_directory.cmake:1 \(cmake_language\):
+  cmake_language DEFER DIRECTORY:
+
+    [^
+]*/Tests/RunCMake/cmake_language/does_not_exist
+
+  is not known.  It may not have been processed yet.
+Call Stack \(most recent call first\):
+  CMakeLists.txt:3 \(include\)$
diff --git a/Tests/RunCMake/cmake_language/defer_call_missing_directory.cmake b/Tests/RunCMake/cmake_language/defer_call_missing_directory.cmake
new file mode 100644
index 0000000..01f4c40
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_call_missing_directory.cmake
@@ -0,0 +1 @@
+cmake_language(DEFER DIRECTORY does_not_exist CALL message "Should not be allowed.")
diff --git a/Tests/RunCMake/cmake_language/defer_call_policy_PUSH-result.txt b/Tests/RunCMake/cmake_language/defer_call_policy_PUSH-result.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_call_policy_PUSH-result.txt
@@ -0,0 +1 @@
+1
diff --git a/Tests/RunCMake/cmake_language/defer_call_policy_PUSH-stderr.txt b/Tests/RunCMake/cmake_language/defer_call_policy_PUSH-stderr.txt
new file mode 100644
index 0000000..923be13
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_call_policy_PUSH-stderr.txt
@@ -0,0 +1,2 @@
+^CMake Error at CMakeLists.txt:DEFERRED:
+  cmake_policy PUSH without matching POP$
diff --git a/Tests/RunCMake/cmake_language/defer_call_policy_PUSH.cmake b/Tests/RunCMake/cmake_language/defer_call_policy_PUSH.cmake
new file mode 100644
index 0000000..66cb760
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_call_policy_PUSH.cmake
@@ -0,0 +1 @@
+cmake_language(DEFER CALL cmake_policy PUSH)
diff --git a/Tests/RunCMake/cmake_language/defer_call_syntax_error-result.txt b/Tests/RunCMake/cmake_language/defer_call_syntax_error-result.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_call_syntax_error-result.txt
@@ -0,0 +1 @@
+1
diff --git a/Tests/RunCMake/cmake_language/defer_call_syntax_error-stderr.txt b/Tests/RunCMake/cmake_language/defer_call_syntax_error-stderr.txt
new file mode 100644
index 0000000..80db4aa
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_call_syntax_error-stderr.txt
@@ -0,0 +1,13 @@
+^CMake Error at defer_call_syntax_error.cmake:2 \(message\):
+  Syntax error in cmake code at
+
+    [^
+]*/Tests/RunCMake/cmake_language/defer_call_syntax_error.cmake:2
+
+  when parsing string
+
+    Deferred \\X Error
+
+  Invalid character escape '\\X'.
+Call Stack \(most recent call first\):
+  CMakeLists.txt:DEFERRED$
diff --git a/Tests/RunCMake/cmake_language/defer_call_syntax_error.cmake b/Tests/RunCMake/cmake_language/defer_call_syntax_error.cmake
new file mode 100644
index 0000000..c3c044b
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_call_syntax_error.cmake
@@ -0,0 +1,2 @@
+# Argument syntax error evaluated at deferred call site.
+cmake_language(DEFER CALL message "Deferred \X Error")
diff --git a/Tests/RunCMake/cmake_language/defer_call_trace-stderr.txt b/Tests/RunCMake/cmake_language/defer_call_trace-stderr.txt
new file mode 100644
index 0000000..b61b236
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_call_trace-stderr.txt
@@ -0,0 +1,8 @@
+[^
+]*/Tests/RunCMake/cmake_language/defer_call_trace.cmake\(2\):  cmake_language\(DEFER CALL message Deferred Message \)
+[^
+]*/Tests/RunCMake/cmake_language/defer_call_trace.cmake\(3\):  message\(Immediate Message \)
+Immediate Message
+[^
+]*/Tests/RunCMake/cmake_language/defer_call_trace.cmake\(2\):DEFERRED:__0:  message\(Deferred Message \)
+Deferred Message$
diff --git a/Tests/RunCMake/cmake_language/defer_call_trace.cmake b/Tests/RunCMake/cmake_language/defer_call_trace.cmake
new file mode 100644
index 0000000..5ed383f
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_call_trace.cmake
@@ -0,0 +1,3 @@
+# The --trace and --trace-expand output point here for deferred call.
+cmake_language(DEFER CALL message "Deferred Message")
+message("Immediate Message")
diff --git a/Tests/RunCMake/cmake_language/defer_call_trace_json-stderr.txt b/Tests/RunCMake/cmake_language/defer_call_trace_json-stderr.txt
new file mode 100644
index 0000000..647beb0
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_call_trace_json-stderr.txt
@@ -0,0 +1,5 @@
+{"args":\["DEFER","CALL","message","Deferred Message"\],"cmd":"cmake_language","file":"[^"]*/Tests/RunCMake/cmake_language/defer_call_trace_json.cmake","frame":2,"line":2,"time":[0-9.]+}
+{"args":\["Immediate Message"\],"cmd":"message","file":"[^"]*/Tests/RunCMake/cmake_language/defer_call_trace_json.cmake","frame":2,"line":3,"time":[0-9.]+}
+Immediate Message
+{"args":\["Deferred Message"],"cmd":"message","defer":"__0","file":"[^"]*/Tests/RunCMake/cmake_language/defer_call_trace_json.cmake","frame":1,"line":2,"time":[0-9.]+}
+Deferred Message$
diff --git a/Tests/RunCMake/cmake_language/defer_call_trace_json.cmake b/Tests/RunCMake/cmake_language/defer_call_trace_json.cmake
new file mode 100644
index 0000000..5ed383f
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_call_trace_json.cmake
@@ -0,0 +1,3 @@
+# The --trace and --trace-expand output point here for deferred call.
+cmake_language(DEFER CALL message "Deferred Message")
+message("Immediate Message")
diff --git a/Tests/RunCMake/cmake_language/defer_cancel_call_id-result.txt b/Tests/RunCMake/cmake_language/defer_cancel_call_id-result.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_cancel_call_id-result.txt
@@ -0,0 +1 @@
+1
diff --git a/Tests/RunCMake/cmake_language/defer_cancel_call_id-stderr.txt b/Tests/RunCMake/cmake_language/defer_cancel_call_id-stderr.txt
new file mode 100644
index 0000000..8a13c0d
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_cancel_call_id-stderr.txt
@@ -0,0 +1,4 @@
+^CMake Error at defer_cancel_call_id.cmake:1 \(cmake_language\):
+  cmake_language DEFER CANCEL_CALL does not accept ID or ID_VAR.
+Call Stack \(most recent call first\):
+  CMakeLists.txt:3 \(include\)$
diff --git a/Tests/RunCMake/cmake_language/defer_cancel_call_id.cmake b/Tests/RunCMake/cmake_language/defer_cancel_call_id.cmake
new file mode 100644
index 0000000..6e5b5c8
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_cancel_call_id.cmake
@@ -0,0 +1 @@
+cmake_language(DEFER ID id CANCEL_CALL)
diff --git a/Tests/RunCMake/cmake_language/defer_cancel_call_id_var-result.txt b/Tests/RunCMake/cmake_language/defer_cancel_call_id_var-result.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_cancel_call_id_var-result.txt
@@ -0,0 +1 @@
+1
diff --git a/Tests/RunCMake/cmake_language/defer_cancel_call_id_var-stderr.txt b/Tests/RunCMake/cmake_language/defer_cancel_call_id_var-stderr.txt
new file mode 100644
index 0000000..5783c50
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_cancel_call_id_var-stderr.txt
@@ -0,0 +1,4 @@
+^CMake Error at defer_cancel_call_id_var.cmake:1 \(cmake_language\):
+  cmake_language DEFER CANCEL_CALL does not accept ID or ID_VAR.
+Call Stack \(most recent call first\):
+  CMakeLists.txt:3 \(include\)$
diff --git a/Tests/RunCMake/cmake_language/defer_cancel_call_id_var.cmake b/Tests/RunCMake/cmake_language/defer_cancel_call_id_var.cmake
new file mode 100644
index 0000000..9f75221
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_cancel_call_id_var.cmake
@@ -0,0 +1 @@
+cmake_language(DEFER ID_VAR id_var CANCEL_CALL)
diff --git a/Tests/RunCMake/cmake_language/defer_cancel_call_invalid_directory-result.txt b/Tests/RunCMake/cmake_language/defer_cancel_call_invalid_directory-result.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_cancel_call_invalid_directory-result.txt
@@ -0,0 +1 @@
+1
diff --git a/Tests/RunCMake/cmake_language/defer_cancel_call_invalid_directory-stderr.txt b/Tests/RunCMake/cmake_language/defer_cancel_call_invalid_directory-stderr.txt
new file mode 100644
index 0000000..cacbf9a
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_cancel_call_invalid_directory-stderr.txt
@@ -0,0 +1,9 @@
+^CMake Error at defer_cancel_call_invalid_directory.cmake:2 \(cmake_language\):
+  cmake_language DEFER CANCEL_CALL may not update directory:
+
+    [^
+]*/Tests/RunCMake/cmake_language/defer_cancel_call_invalid_directory-build/defer_cancel_call_invalid_directory
+
+  at this time.
+Call Stack \(most recent call first\):
+  CMakeLists.txt:3 \(include\)
diff --git a/Tests/RunCMake/cmake_language/defer_cancel_call_invalid_directory.cmake b/Tests/RunCMake/cmake_language/defer_cancel_call_invalid_directory.cmake
new file mode 100644
index 0000000..29a8fc2
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_cancel_call_invalid_directory.cmake
@@ -0,0 +1,2 @@
+add_subdirectory(defer_cancel_call_invalid_directory)
+cmake_language(DEFER DIRECTORY defer_cancel_call_invalid_directory CANCEL_CALL _)
diff --git a/Tests/RunCMake/cmake_language/defer_cancel_call_invalid_directory/CMakeLists.txt b/Tests/RunCMake/cmake_language/defer_cancel_call_invalid_directory/CMakeLists.txt
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_cancel_call_invalid_directory/CMakeLists.txt
diff --git a/Tests/RunCMake/cmake_language/defer_cancel_call_unknown_argument-result.txt b/Tests/RunCMake/cmake_language/defer_cancel_call_unknown_argument-result.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_cancel_call_unknown_argument-result.txt
@@ -0,0 +1 @@
+1
diff --git a/Tests/RunCMake/cmake_language/defer_cancel_call_unknown_argument-stderr.txt b/Tests/RunCMake/cmake_language/defer_cancel_call_unknown_argument-stderr.txt
new file mode 100644
index 0000000..eb8f2b9
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_cancel_call_unknown_argument-stderr.txt
@@ -0,0 +1,6 @@
+^CMake Error at defer_cancel_call_unknown_argument.cmake:1 \(cmake_language\):
+  cmake_language DEFER CANCEL_CALL unknown argument:
+
+    UNKNOWN
+Call Stack \(most recent call first\):
+  CMakeLists.txt:3 \(include\)$
diff --git a/Tests/RunCMake/cmake_language/defer_cancel_call_unknown_argument.cmake b/Tests/RunCMake/cmake_language/defer_cancel_call_unknown_argument.cmake
new file mode 100644
index 0000000..fbc6309
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_cancel_call_unknown_argument.cmake
@@ -0,0 +1 @@
+cmake_language(DEFER CANCEL_CALL UNKNOWN)
diff --git a/Tests/RunCMake/cmake_language/defer_directory_empty-result.txt b/Tests/RunCMake/cmake_language/defer_directory_empty-result.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_directory_empty-result.txt
@@ -0,0 +1 @@
+1
diff --git a/Tests/RunCMake/cmake_language/defer_directory_empty-stderr.txt b/Tests/RunCMake/cmake_language/defer_directory_empty-stderr.txt
new file mode 100644
index 0000000..587dfa9
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_directory_empty-stderr.txt
@@ -0,0 +1,4 @@
+^CMake Error at defer_directory_empty.cmake:1 \(cmake_language\):
+  cmake_language DEFER DIRECTORY may not be empty
+Call Stack \(most recent call first\):
+  CMakeLists.txt:3 \(include\)$
diff --git a/Tests/RunCMake/cmake_language/defer_directory_empty.cmake b/Tests/RunCMake/cmake_language/defer_directory_empty.cmake
new file mode 100644
index 0000000..f4e4553
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_directory_empty.cmake
@@ -0,0 +1 @@
+cmake_language(DEFER DIRECTORY "")
diff --git a/Tests/RunCMake/cmake_language/defer_directory_missing-result.txt b/Tests/RunCMake/cmake_language/defer_directory_missing-result.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_directory_missing-result.txt
@@ -0,0 +1 @@
+1
diff --git a/Tests/RunCMake/cmake_language/defer_directory_missing-stderr.txt b/Tests/RunCMake/cmake_language/defer_directory_missing-stderr.txt
new file mode 100644
index 0000000..1db8e99
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_directory_missing-stderr.txt
@@ -0,0 +1,4 @@
+^CMake Error at defer_directory_missing.cmake:1 \(cmake_language\):
+  cmake_language DEFER DIRECTORY missing value
+Call Stack \(most recent call first\):
+  CMakeLists.txt:3 \(include\)$
diff --git a/Tests/RunCMake/cmake_language/defer_directory_missing.cmake b/Tests/RunCMake/cmake_language/defer_directory_missing.cmake
new file mode 100644
index 0000000..fbdb177
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_directory_missing.cmake
@@ -0,0 +1 @@
+cmake_language(DEFER DIRECTORY)
diff --git a/Tests/RunCMake/cmake_language/defer_directory_multiple-result.txt b/Tests/RunCMake/cmake_language/defer_directory_multiple-result.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_directory_multiple-result.txt
@@ -0,0 +1 @@
+1
diff --git a/Tests/RunCMake/cmake_language/defer_directory_multiple-stderr.txt b/Tests/RunCMake/cmake_language/defer_directory_multiple-stderr.txt
new file mode 100644
index 0000000..f4d09b9
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_directory_multiple-stderr.txt
@@ -0,0 +1,4 @@
+^CMake Error at defer_directory_multiple.cmake:1 \(cmake_language\):
+  cmake_language DEFER given multiple DIRECTORY arguments
+Call Stack \(most recent call first\):
+  CMakeLists.txt:3 \(include\)$
diff --git a/Tests/RunCMake/cmake_language/defer_directory_multiple.cmake b/Tests/RunCMake/cmake_language/defer_directory_multiple.cmake
new file mode 100644
index 0000000..baf037b
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_directory_multiple.cmake
@@ -0,0 +1 @@
+cmake_language(DEFER DIRECTORY . DIRECTORY x CALL message "Should not be allowed.")
diff --git a/Tests/RunCMake/cmake_language/defer_get_call_id-result.txt b/Tests/RunCMake/cmake_language/defer_get_call_id-result.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_get_call_id-result.txt
@@ -0,0 +1 @@
+1
diff --git a/Tests/RunCMake/cmake_language/defer_get_call_id-stderr.txt b/Tests/RunCMake/cmake_language/defer_get_call_id-stderr.txt
new file mode 100644
index 0000000..e161a5f
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_get_call_id-stderr.txt
@@ -0,0 +1,4 @@
+^CMake Error at defer_get_call_id.cmake:1 \(cmake_language\):
+  cmake_language DEFER GET_CALL does not accept ID or ID_VAR.
+Call Stack \(most recent call first\):
+  CMakeLists.txt:3 \(include\)$
diff --git a/Tests/RunCMake/cmake_language/defer_get_call_id.cmake b/Tests/RunCMake/cmake_language/defer_get_call_id.cmake
new file mode 100644
index 0000000..7a395ea
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_get_call_id.cmake
@@ -0,0 +1 @@
+cmake_language(DEFER ID id GET_CALL)
diff --git a/Tests/RunCMake/cmake_language/defer_get_call_id_empty-result.txt b/Tests/RunCMake/cmake_language/defer_get_call_id_empty-result.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_get_call_id_empty-result.txt
@@ -0,0 +1 @@
+1
diff --git a/Tests/RunCMake/cmake_language/defer_get_call_id_empty-stderr.txt b/Tests/RunCMake/cmake_language/defer_get_call_id_empty-stderr.txt
new file mode 100644
index 0000000..c7c534b
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_get_call_id_empty-stderr.txt
@@ -0,0 +1,4 @@
+^CMake Error at defer_get_call_id_empty.cmake:1 \(cmake_language\):
+  cmake_language DEFER GET_CALL id may not be empty
+Call Stack \(most recent call first\):
+  CMakeLists.txt:3 \(include\)$
diff --git a/Tests/RunCMake/cmake_language/defer_get_call_id_empty.cmake b/Tests/RunCMake/cmake_language/defer_get_call_id_empty.cmake
new file mode 100644
index 0000000..4f39f2d
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_get_call_id_empty.cmake
@@ -0,0 +1 @@
+cmake_language(DEFER GET_CALL "" var)
diff --git a/Tests/RunCMake/cmake_language/defer_get_call_id_var-result.txt b/Tests/RunCMake/cmake_language/defer_get_call_id_var-result.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_get_call_id_var-result.txt
@@ -0,0 +1 @@
+1
diff --git a/Tests/RunCMake/cmake_language/defer_get_call_id_var-stderr.txt b/Tests/RunCMake/cmake_language/defer_get_call_id_var-stderr.txt
new file mode 100644
index 0000000..2cfd942
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_get_call_id_var-stderr.txt
@@ -0,0 +1,4 @@
+^CMake Error at defer_get_call_id_var.cmake:1 \(cmake_language\):
+  cmake_language DEFER GET_CALL does not accept ID or ID_VAR.
+Call Stack \(most recent call first\):
+  CMakeLists.txt:3 \(include\)$
diff --git a/Tests/RunCMake/cmake_language/defer_get_call_id_var.cmake b/Tests/RunCMake/cmake_language/defer_get_call_id_var.cmake
new file mode 100644
index 0000000..ade0815
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_get_call_id_var.cmake
@@ -0,0 +1 @@
+cmake_language(DEFER ID_VAR id_var GET_CALL)
diff --git a/Tests/RunCMake/cmake_language/defer_get_call_ids_id-result.txt b/Tests/RunCMake/cmake_language/defer_get_call_ids_id-result.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_get_call_ids_id-result.txt
@@ -0,0 +1 @@
+1
diff --git a/Tests/RunCMake/cmake_language/defer_get_call_ids_id-stderr.txt b/Tests/RunCMake/cmake_language/defer_get_call_ids_id-stderr.txt
new file mode 100644
index 0000000..072ee45
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_get_call_ids_id-stderr.txt
@@ -0,0 +1,4 @@
+^CMake Error at defer_get_call_ids_id.cmake:1 \(cmake_language\):
+  cmake_language DEFER GET_CALL_IDS does not accept ID or ID_VAR.
+Call Stack \(most recent call first\):
+  CMakeLists.txt:3 \(include\)$
diff --git a/Tests/RunCMake/cmake_language/defer_get_call_ids_id.cmake b/Tests/RunCMake/cmake_language/defer_get_call_ids_id.cmake
new file mode 100644
index 0000000..4eb2555
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_get_call_ids_id.cmake
@@ -0,0 +1 @@
+cmake_language(DEFER ID id GET_CALL_IDS)
diff --git a/Tests/RunCMake/cmake_language/defer_get_call_ids_id_var-result.txt b/Tests/RunCMake/cmake_language/defer_get_call_ids_id_var-result.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_get_call_ids_id_var-result.txt
@@ -0,0 +1 @@
+1
diff --git a/Tests/RunCMake/cmake_language/defer_get_call_ids_id_var-stderr.txt b/Tests/RunCMake/cmake_language/defer_get_call_ids_id_var-stderr.txt
new file mode 100644
index 0000000..e4a288c
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_get_call_ids_id_var-stderr.txt
@@ -0,0 +1,4 @@
+^CMake Error at defer_get_call_ids_id_var.cmake:1 \(cmake_language\):
+  cmake_language DEFER GET_CALL_IDS does not accept ID or ID_VAR.
+Call Stack \(most recent call first\):
+  CMakeLists.txt:3 \(include\)$
diff --git a/Tests/RunCMake/cmake_language/defer_get_call_ids_id_var.cmake b/Tests/RunCMake/cmake_language/defer_get_call_ids_id_var.cmake
new file mode 100644
index 0000000..c27de79
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_get_call_ids_id_var.cmake
@@ -0,0 +1 @@
+cmake_language(DEFER ID_VAR id_var GET_CALL_IDS)
diff --git a/Tests/RunCMake/cmake_language/defer_get_call_ids_invalid_directory-result.txt b/Tests/RunCMake/cmake_language/defer_get_call_ids_invalid_directory-result.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_get_call_ids_invalid_directory-result.txt
@@ -0,0 +1 @@
+1
diff --git a/Tests/RunCMake/cmake_language/defer_get_call_ids_invalid_directory-stderr.txt b/Tests/RunCMake/cmake_language/defer_get_call_ids_invalid_directory-stderr.txt
new file mode 100644
index 0000000..edebe32
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_get_call_ids_invalid_directory-stderr.txt
@@ -0,0 +1,9 @@
+^CMake Error at defer_get_call_ids_invalid_directory.cmake:2 \(cmake_language\):
+  cmake_language DEFER GET_CALL_IDS may not access directory:
+
+    [^
+]*/Tests/RunCMake/cmake_language/defer_get_call_ids_invalid_directory-build/defer_get_call_ids_invalid_directory
+
+  at this time.
+Call Stack \(most recent call first\):
+  CMakeLists.txt:3 \(include\)$
diff --git a/Tests/RunCMake/cmake_language/defer_get_call_ids_invalid_directory.cmake b/Tests/RunCMake/cmake_language/defer_get_call_ids_invalid_directory.cmake
new file mode 100644
index 0000000..81f098e
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_get_call_ids_invalid_directory.cmake
@@ -0,0 +1,2 @@
+add_subdirectory(defer_get_call_ids_invalid_directory)
+cmake_language(DEFER DIRECTORY defer_get_call_ids_invalid_directory GET_CALL_IDS var)
diff --git a/Tests/RunCMake/cmake_language/defer_get_call_ids_invalid_directory/CMakeLists.txt b/Tests/RunCMake/cmake_language/defer_get_call_ids_invalid_directory/CMakeLists.txt
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_get_call_ids_invalid_directory/CMakeLists.txt
diff --git a/Tests/RunCMake/cmake_language/defer_get_call_ids_missing_var-result.txt b/Tests/RunCMake/cmake_language/defer_get_call_ids_missing_var-result.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_get_call_ids_missing_var-result.txt
@@ -0,0 +1 @@
+1
diff --git a/Tests/RunCMake/cmake_language/defer_get_call_ids_missing_var-stderr.txt b/Tests/RunCMake/cmake_language/defer_get_call_ids_missing_var-stderr.txt
new file mode 100644
index 0000000..a2951cf
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_get_call_ids_missing_var-stderr.txt
@@ -0,0 +1,4 @@
+^CMake Error at defer_get_call_ids_missing_var.cmake:1 \(cmake_language\):
+  cmake_language DEFER GET_CALL_IDS missing output variable
+Call Stack \(most recent call first\):
+  CMakeLists.txt:3 \(include\)$
diff --git a/Tests/RunCMake/cmake_language/defer_get_call_ids_missing_var.cmake b/Tests/RunCMake/cmake_language/defer_get_call_ids_missing_var.cmake
new file mode 100644
index 0000000..b171f04
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_get_call_ids_missing_var.cmake
@@ -0,0 +1 @@
+cmake_language(DEFER GET_CALL_IDS)
diff --git a/Tests/RunCMake/cmake_language/defer_get_call_ids_too_many_args-result.txt b/Tests/RunCMake/cmake_language/defer_get_call_ids_too_many_args-result.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_get_call_ids_too_many_args-result.txt
@@ -0,0 +1 @@
+1
diff --git a/Tests/RunCMake/cmake_language/defer_get_call_ids_too_many_args-stderr.txt b/Tests/RunCMake/cmake_language/defer_get_call_ids_too_many_args-stderr.txt
new file mode 100644
index 0000000..5691519
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_get_call_ids_too_many_args-stderr.txt
@@ -0,0 +1,4 @@
+^CMake Error at defer_get_call_ids_too_many_args.cmake:1 \(cmake_language\):
+  cmake_language DEFER GET_CALL_IDS given too many arguments
+Call Stack \(most recent call first\):
+  CMakeLists.txt:3 \(include\)$
diff --git a/Tests/RunCMake/cmake_language/defer_get_call_ids_too_many_args.cmake b/Tests/RunCMake/cmake_language/defer_get_call_ids_too_many_args.cmake
new file mode 100644
index 0000000..0158684
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_get_call_ids_too_many_args.cmake
@@ -0,0 +1 @@
+cmake_language(DEFER GET_CALL_IDS var extra)
diff --git a/Tests/RunCMake/cmake_language/defer_get_call_missing_id-result.txt b/Tests/RunCMake/cmake_language/defer_get_call_missing_id-result.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_get_call_missing_id-result.txt
@@ -0,0 +1 @@
+1
diff --git a/Tests/RunCMake/cmake_language/defer_get_call_missing_id-stderr.txt b/Tests/RunCMake/cmake_language/defer_get_call_missing_id-stderr.txt
new file mode 100644
index 0000000..081aa95
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_get_call_missing_id-stderr.txt
@@ -0,0 +1,4 @@
+^CMake Error at defer_get_call_missing_id.cmake:1 \(cmake_language\):
+  cmake_language DEFER GET_CALL missing id
+Call Stack \(most recent call first\):
+  CMakeLists.txt:3 \(include\)$
diff --git a/Tests/RunCMake/cmake_language/defer_get_call_missing_id.cmake b/Tests/RunCMake/cmake_language/defer_get_call_missing_id.cmake
new file mode 100644
index 0000000..0542abc
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_get_call_missing_id.cmake
@@ -0,0 +1 @@
+cmake_language(DEFER GET_CALL)
diff --git a/Tests/RunCMake/cmake_language/defer_get_call_missing_var-result.txt b/Tests/RunCMake/cmake_language/defer_get_call_missing_var-result.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_get_call_missing_var-result.txt
@@ -0,0 +1 @@
+1
diff --git a/Tests/RunCMake/cmake_language/defer_get_call_missing_var-stderr.txt b/Tests/RunCMake/cmake_language/defer_get_call_missing_var-stderr.txt
new file mode 100644
index 0000000..1b2641f
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_get_call_missing_var-stderr.txt
@@ -0,0 +1,4 @@
+^CMake Error at defer_get_call_missing_var.cmake:1 \(cmake_language\):
+  cmake_language DEFER GET_CALL missing output variable
+Call Stack \(most recent call first\):
+  CMakeLists.txt:3 \(include\)$
diff --git a/Tests/RunCMake/cmake_language/defer_get_call_missing_var.cmake b/Tests/RunCMake/cmake_language/defer_get_call_missing_var.cmake
new file mode 100644
index 0000000..7916d29
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_get_call_missing_var.cmake
@@ -0,0 +1 @@
+cmake_language(DEFER GET_CALL id)
diff --git a/Tests/RunCMake/cmake_language/defer_get_call_too_many_args-result.txt b/Tests/RunCMake/cmake_language/defer_get_call_too_many_args-result.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_get_call_too_many_args-result.txt
@@ -0,0 +1 @@
+1
diff --git a/Tests/RunCMake/cmake_language/defer_get_call_too_many_args-stderr.txt b/Tests/RunCMake/cmake_language/defer_get_call_too_many_args-stderr.txt
new file mode 100644
index 0000000..b6ee2d6
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_get_call_too_many_args-stderr.txt
@@ -0,0 +1,4 @@
+^CMake Error at defer_get_call_too_many_args.cmake:1 \(cmake_language\):
+  cmake_language DEFER GET_CALL given too many arguments
+Call Stack \(most recent call first\):
+  CMakeLists.txt:3 \(include\)$
diff --git a/Tests/RunCMake/cmake_language/defer_get_call_too_many_args.cmake b/Tests/RunCMake/cmake_language/defer_get_call_too_many_args.cmake
new file mode 100644
index 0000000..ed65779
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_get_call_too_many_args.cmake
@@ -0,0 +1 @@
+cmake_language(DEFER GET_CALL id var extra)
diff --git a/Tests/RunCMake/cmake_language/defer_get_call_unknown_argument-result.txt b/Tests/RunCMake/cmake_language/defer_get_call_unknown_argument-result.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_get_call_unknown_argument-result.txt
@@ -0,0 +1 @@
+1
diff --git a/Tests/RunCMake/cmake_language/defer_get_call_unknown_argument-stderr.txt b/Tests/RunCMake/cmake_language/defer_get_call_unknown_argument-stderr.txt
new file mode 100644
index 0000000..ac16596
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_get_call_unknown_argument-stderr.txt
@@ -0,0 +1,6 @@
+^CMake Error at defer_get_call_unknown_argument.cmake:1 \(cmake_language\):
+  cmake_language DEFER GET_CALL unknown argument:
+
+   UNKNOWN
+Call Stack \(most recent call first\):
+  CMakeLists.txt:3 \(include\)$
diff --git a/Tests/RunCMake/cmake_language/defer_get_call_unknown_argument.cmake b/Tests/RunCMake/cmake_language/defer_get_call_unknown_argument.cmake
new file mode 100644
index 0000000..d0caa39
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_get_call_unknown_argument.cmake
@@ -0,0 +1 @@
+cmake_language(DEFER GET_CALL UNKNOWN var)
diff --git a/Tests/RunCMake/cmake_language/defer_id_empty-result.txt b/Tests/RunCMake/cmake_language/defer_id_empty-result.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_id_empty-result.txt
@@ -0,0 +1 @@
+1
diff --git a/Tests/RunCMake/cmake_language/defer_id_empty-stderr.txt b/Tests/RunCMake/cmake_language/defer_id_empty-stderr.txt
new file mode 100644
index 0000000..1e7f772
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_id_empty-stderr.txt
@@ -0,0 +1,4 @@
+^CMake Error at defer_id_empty.cmake:1 \(cmake_language\):
+  cmake_language DEFER ID may not be empty
+Call Stack \(most recent call first\):
+  CMakeLists.txt:3 \(include\)$
diff --git a/Tests/RunCMake/cmake_language/defer_id_empty.cmake b/Tests/RunCMake/cmake_language/defer_id_empty.cmake
new file mode 100644
index 0000000..326762c
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_id_empty.cmake
@@ -0,0 +1 @@
+cmake_language(DEFER ID "")
diff --git a/Tests/RunCMake/cmake_language/defer_id_missing-result.txt b/Tests/RunCMake/cmake_language/defer_id_missing-result.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_id_missing-result.txt
@@ -0,0 +1 @@
+1
diff --git a/Tests/RunCMake/cmake_language/defer_id_missing-stderr.txt b/Tests/RunCMake/cmake_language/defer_id_missing-stderr.txt
new file mode 100644
index 0000000..cef5f0e
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_id_missing-stderr.txt
@@ -0,0 +1,4 @@
+^CMake Error at defer_id_missing.cmake:1 \(cmake_language\):
+  cmake_language DEFER ID missing value
+Call Stack \(most recent call first\):
+  CMakeLists.txt:3 \(include\)$
diff --git a/Tests/RunCMake/cmake_language/defer_id_missing.cmake b/Tests/RunCMake/cmake_language/defer_id_missing.cmake
new file mode 100644
index 0000000..4de687d
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_id_missing.cmake
@@ -0,0 +1 @@
+cmake_language(DEFER ID)
diff --git a/Tests/RunCMake/cmake_language/defer_id_multiple-result.txt b/Tests/RunCMake/cmake_language/defer_id_multiple-result.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_id_multiple-result.txt
@@ -0,0 +1 @@
+1
diff --git a/Tests/RunCMake/cmake_language/defer_id_multiple-stderr.txt b/Tests/RunCMake/cmake_language/defer_id_multiple-stderr.txt
new file mode 100644
index 0000000..1725521
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_id_multiple-stderr.txt
@@ -0,0 +1,4 @@
+^CMake Error at defer_id_multiple.cmake:1 \(cmake_language\):
+  cmake_language DEFER given multiple ID arguments
+Call Stack \(most recent call first\):
+  CMakeLists.txt:3 \(include\)$
diff --git a/Tests/RunCMake/cmake_language/defer_id_multiple.cmake b/Tests/RunCMake/cmake_language/defer_id_multiple.cmake
new file mode 100644
index 0000000..69187af
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_id_multiple.cmake
@@ -0,0 +1 @@
+cmake_language(DEFER ID a ID b CALL message "Should not be allowed.")
diff --git a/Tests/RunCMake/cmake_language/defer_id_var_empty-result.txt b/Tests/RunCMake/cmake_language/defer_id_var_empty-result.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_id_var_empty-result.txt
@@ -0,0 +1 @@
+1
diff --git a/Tests/RunCMake/cmake_language/defer_id_var_empty-stderr.txt b/Tests/RunCMake/cmake_language/defer_id_var_empty-stderr.txt
new file mode 100644
index 0000000..bb5cd43
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_id_var_empty-stderr.txt
@@ -0,0 +1,4 @@
+^CMake Error at defer_id_var_empty.cmake:1 \(cmake_language\):
+  cmake_language DEFER ID_VAR may not be empty
+Call Stack \(most recent call first\):
+  CMakeLists.txt:3 \(include\)$
diff --git a/Tests/RunCMake/cmake_language/defer_id_var_empty.cmake b/Tests/RunCMake/cmake_language/defer_id_var_empty.cmake
new file mode 100644
index 0000000..c7198f5
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_id_var_empty.cmake
@@ -0,0 +1 @@
+cmake_language(DEFER ID_VAR "")
diff --git a/Tests/RunCMake/cmake_language/defer_id_var_missing-result.txt b/Tests/RunCMake/cmake_language/defer_id_var_missing-result.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_id_var_missing-result.txt
@@ -0,0 +1 @@
+1
diff --git a/Tests/RunCMake/cmake_language/defer_id_var_missing-stderr.txt b/Tests/RunCMake/cmake_language/defer_id_var_missing-stderr.txt
new file mode 100644
index 0000000..f4e0d6e
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_id_var_missing-stderr.txt
@@ -0,0 +1,4 @@
+^CMake Error at defer_id_var_missing.cmake:1 \(cmake_language\):
+  cmake_language DEFER ID_VAR missing variable name
+Call Stack \(most recent call first\):
+  CMakeLists.txt:3 \(include\)$
diff --git a/Tests/RunCMake/cmake_language/defer_id_var_missing.cmake b/Tests/RunCMake/cmake_language/defer_id_var_missing.cmake
new file mode 100644
index 0000000..359d149
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_id_var_missing.cmake
@@ -0,0 +1 @@
+cmake_language(DEFER ID_VAR)
diff --git a/Tests/RunCMake/cmake_language/defer_id_var_multiple-result.txt b/Tests/RunCMake/cmake_language/defer_id_var_multiple-result.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_id_var_multiple-result.txt
@@ -0,0 +1 @@
+1
diff --git a/Tests/RunCMake/cmake_language/defer_id_var_multiple-stderr.txt b/Tests/RunCMake/cmake_language/defer_id_var_multiple-stderr.txt
new file mode 100644
index 0000000..4368b06
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_id_var_multiple-stderr.txt
@@ -0,0 +1,4 @@
+^CMake Error at defer_id_var_multiple.cmake:1 \(cmake_language\):
+  cmake_language DEFER given multiple ID_VAR arguments
+Call Stack \(most recent call first\):
+  CMakeLists.txt:3 \(include\)$
diff --git a/Tests/RunCMake/cmake_language/defer_id_var_multiple.cmake b/Tests/RunCMake/cmake_language/defer_id_var_multiple.cmake
new file mode 100644
index 0000000..665ea94
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_id_var_multiple.cmake
@@ -0,0 +1 @@
+cmake_language(DEFER ID_VAR a ID_VAR b CALL message "Should not be allowed.")
diff --git a/Tests/RunCMake/cmake_language/defer_missing_arg-result.txt b/Tests/RunCMake/cmake_language/defer_missing_arg-result.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_missing_arg-result.txt
@@ -0,0 +1 @@
+1
diff --git a/Tests/RunCMake/cmake_language/defer_missing_arg-stderr.txt b/Tests/RunCMake/cmake_language/defer_missing_arg-stderr.txt
new file mode 100644
index 0000000..3e656cd
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_missing_arg-stderr.txt
@@ -0,0 +1,4 @@
+^CMake Error at defer_missing_arg.cmake:1 \(cmake_language\):
+  cmake_language DEFER requires at least one argument
+Call Stack \(most recent call first\):
+  CMakeLists.txt:3 \(include\)$
diff --git a/Tests/RunCMake/cmake_language/defer_missing_arg.cmake b/Tests/RunCMake/cmake_language/defer_missing_arg.cmake
new file mode 100644
index 0000000..737a8c8
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_missing_arg.cmake
@@ -0,0 +1 @@
+cmake_language(DEFER)
diff --git a/Tests/RunCMake/cmake_language/defer_missing_call-result.txt b/Tests/RunCMake/cmake_language/defer_missing_call-result.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_missing_call-result.txt
@@ -0,0 +1 @@
+1
diff --git a/Tests/RunCMake/cmake_language/defer_missing_call-stderr.txt b/Tests/RunCMake/cmake_language/defer_missing_call-stderr.txt
new file mode 100644
index 0000000..7eeef76
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_missing_call-stderr.txt
@@ -0,0 +1,4 @@
+^CMake Error at defer_missing_call.cmake:1 \(cmake_language\):
+  cmake_language DEFER must be followed by a CALL argument
+Call Stack \(most recent call first\):
+  CMakeLists.txt:3 \(include\)$
diff --git a/Tests/RunCMake/cmake_language/defer_missing_call.cmake b/Tests/RunCMake/cmake_language/defer_missing_call.cmake
new file mode 100644
index 0000000..0b330ef
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_missing_call.cmake
@@ -0,0 +1 @@
+cmake_language(DEFER DIRECTORY .)
diff --git a/Tests/RunCMake/cmake_language/defer_unknown_option-result.txt b/Tests/RunCMake/cmake_language/defer_unknown_option-result.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_unknown_option-result.txt
@@ -0,0 +1 @@
+1
diff --git a/Tests/RunCMake/cmake_language/defer_unknown_option-stderr.txt b/Tests/RunCMake/cmake_language/defer_unknown_option-stderr.txt
new file mode 100644
index 0000000..95d87c6
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_unknown_option-stderr.txt
@@ -0,0 +1,6 @@
+^CMake Error at defer_unknown_option.cmake:1 \(cmake_language\):
+  cmake_language DEFER unknown option:
+
+    UNKNOWN
+Call Stack \(most recent call first\):
+  CMakeLists.txt:3 \(include\)$
diff --git a/Tests/RunCMake/cmake_language/defer_unknown_option.cmake b/Tests/RunCMake/cmake_language/defer_unknown_option.cmake
new file mode 100644
index 0000000..876b3f1
--- /dev/null
+++ b/Tests/RunCMake/cmake_language/defer_unknown_option.cmake
@@ -0,0 +1 @@
+cmake_language(DEFER UNKNOWN)