Revert "add_custom_command: Diagnose MAIN_DEPENDENCY limitation."

This reverts commit 242c3966 (add_custom_command: Diagnose
MAIN_DEPENDENCY limitation, 2015-03-09) and the follow up commit
b372a99a (UseSWIG: Do not use MAIN_DEPENDENCY on custom commands,
2015-03-26).

I misdiagnosed the underlying issue that prompted creation of policy CMP0057.
The actual issue surfaces when a single custom command's MAIN_DEPENDENCY
is listed in more than one target; this issue will have to be addressed
independently.

11 files changed, 0 insertions, 70 deletions

diff --git a/Tests/RunCMake/CMP0057/CMP0057-NEW-result.txt b/Tests/RunCMake/CMP0057/CMP0057-NEW-result.txt
deleted file mode 100644
index d00491f..0000000
--- a/Tests/RunCMake/CMP0057/CMP0057-NEW-result.txt
+++ /dev/null
@@ -1 +0,0 @@
-1
diff --git a/Tests/RunCMake/CMP0057/CMP0057-NEW-stderr.txt b/Tests/RunCMake/CMP0057/CMP0057-NEW-stderr.txt
deleted file mode 100644
index 9607d54..0000000
--- a/Tests/RunCMake/CMP0057/CMP0057-NEW-stderr.txt
+++ /dev/null
@@ -1,4 +0,0 @@
-CMake Error at CMP0057-NEW.cmake:8 \(add_custom_command\):
-  "input.txt" can only be specified as a custom command MAIN_DEPENDENCY once.
-Call Stack \(most recent call first\):
-  CMakeLists.txt:3 \(include\)
diff --git a/Tests/RunCMake/CMP0057/CMP0057-NEW.cmake b/Tests/RunCMake/CMP0057/CMP0057-NEW.cmake
deleted file mode 100644
index 22dbfb3..0000000
--- a/Tests/RunCMake/CMP0057/CMP0057-NEW.cmake
+++ /dev/null
@@ -1,13 +0,0 @@
-cmake_policy(SET CMP0057 NEW)
-
-add_custom_command(OUTPUT out1
-  COMMAND ${CMAKE_COMMAND} -E echo out1
-  MAIN_DEPENDENCY input.txt
-)
-
-add_custom_command(OUTPUT out2
-  COMMAND ${CMAKE_COMMAND} -E echo out2
-  MAIN_DEPENDENCY input.txt
-)
-
-add_custom_target(mytarget1 ALL DEPENDS out1 out2)
diff --git a/Tests/RunCMake/CMP0057/CMP0057-OLD.cmake b/Tests/RunCMake/CMP0057/CMP0057-OLD.cmake
deleted file mode 100644
index ccf4fcb..0000000
--- a/Tests/RunCMake/CMP0057/CMP0057-OLD.cmake
+++ /dev/null
@@ -1,13 +0,0 @@
-cmake_policy(SET CMP0057 OLD)
-
-add_custom_command(OUTPUT out1
-  COMMAND ${CMAKE_COMMAND} -E echo out1
-  MAIN_DEPENDENCY input.txt
-)
-
-add_custom_command(OUTPUT out2
-  COMMAND ${CMAKE_COMMAND} -E echo out2
-  MAIN_DEPENDENCY input.txt
-)
-
-add_custom_target(mytarget1 ALL DEPENDS out1 out2)
diff --git a/Tests/RunCMake/CMP0057/CMP0057-WARN-stderr.txt b/Tests/RunCMake/CMP0057/CMP0057-WARN-stderr.txt
deleted file mode 100644
index da3a1cb..0000000
--- a/Tests/RunCMake/CMP0057/CMP0057-WARN-stderr.txt
+++ /dev/null
@@ -1,9 +0,0 @@
-CMake Warning \(dev\) at CMP0057-WARN.cmake:6 \(add_custom_command\):
-  Policy CMP0057 is not set: Disallow multiple MAIN_DEPENDENCY specifications
-  for the same file.  Run "cmake --help-policy CMP0057" for policy details.
-  Use the cmake_policy command to set the policy and suppress this warning.
-
-  "input.txt" can only be specified as a custom command MAIN_DEPENDENCY once.
-Call Stack \(most recent call first\):
-  CMakeLists.txt:3 \(include\)
-This warning is for project developers.  Use -Wno-dev to suppress it.
diff --git a/Tests/RunCMake/CMP0057/CMP0057-WARN.cmake b/Tests/RunCMake/CMP0057/CMP0057-WARN.cmake
deleted file mode 100644
index 1837968..0000000
--- a/Tests/RunCMake/CMP0057/CMP0057-WARN.cmake
+++ /dev/null
@@ -1,11 +0,0 @@
-add_custom_command(OUTPUT out1
- COMMAND ${CMAKE_COMMAND} -E echo out1
-  MAIN_DEPENDENCY input.txt
-)
-
-add_custom_command(OUTPUT out2
-  COMMAND ${CMAKE_COMMAND} -E echo out2
-  MAIN_DEPENDENCY input.txt
-)
-
-add_custom_target(mytarget1 ALL DEPENDS out1 out2)
diff --git a/Tests/RunCMake/CMP0057/CMP0057-once_is_ok.cmake b/Tests/RunCMake/CMP0057/CMP0057-once_is_ok.cmake
deleted file mode 100644
index 8ce02f9..0000000
--- a/Tests/RunCMake/CMP0057/CMP0057-once_is_ok.cmake
+++ /dev/null
@@ -1,8 +0,0 @@
-cmake_policy(SET CMP0057 NEW)
-
-add_custom_command(OUTPUT out1
-  COMMAND ${CMAKE_COMMAND} -E echo out1
-  MAIN_DEPENDENCY input.txt
-)
-
-add_custom_target(mytarget1 ALL DEPENDS out1)
diff --git a/Tests/RunCMake/CMP0057/CMakeLists.txt b/Tests/RunCMake/CMP0057/CMakeLists.txt
deleted file mode 100644
index ef2163c..0000000
--- a/Tests/RunCMake/CMP0057/CMakeLists.txt
+++ /dev/null
@@ -1,3 +0,0 @@
-cmake_minimum_required(VERSION 3.1)
-project(${RunCMake_TEST} NONE)
-include(${RunCMake_TEST}.cmake)
diff --git a/Tests/RunCMake/CMP0057/RunCMakeTest.cmake b/Tests/RunCMake/CMP0057/RunCMakeTest.cmake
deleted file mode 100644
index f79235f..0000000
--- a/Tests/RunCMake/CMP0057/RunCMakeTest.cmake
+++ /dev/null
@@ -1,7 +0,0 @@
-include(RunCMake)
-
-run_cmake(CMP0057-OLD)
-run_cmake(CMP0057-NEW)
-run_cmake(CMP0057-WARN)
-
-run_cmake(CMP0057-once_is_ok)
diff --git a/Tests/RunCMake/CMP0057/input.txt b/Tests/RunCMake/CMP0057/input.txt
deleted file mode 100644
index e69de29..0000000
--- a/Tests/RunCMake/CMP0057/input.txt
+++ /dev/null
diff --git a/Tests/RunCMake/CMakeLists.txt b/Tests/RunCMake/CMakeLists.txt
index d5f1d22..dc18764 100644
--- a/Tests/RunCMake/CMakeLists.txt
+++ b/Tests/RunCMake/CMakeLists.txt
@@ -63,7 +63,6 @@ add_RunCMake_test(CMP0051)
 add_RunCMake_test(CMP0053)
 add_RunCMake_test(CMP0054)
 add_RunCMake_test(CMP0055)
-add_RunCMake_test(CMP0057)
 add_RunCMake_test(CMP0059)
 add_RunCMake_test(CMP0060)
 if(CMAKE_GENERATOR STREQUAL "Ninja")