add_custom_command: Diagnose MAIN_DEPENDENCY limitation.

The new policy CMP0057 diagnoses reuse of the same MAIN_DEPENDENCY across
multiple custom commands.

11 files changed, 70 insertions, 0 deletions

diff --git a/Tests/RunCMake/CMP0057/CMP0057-NEW-result.txt b/Tests/RunCMake/CMP0057/CMP0057-NEW-result.txt
new file mode 100644
index 0000000000..d00491fd7e
--- /dev/null
+++ b/Tests/RunCMake/CMP0057/CMP0057-NEW-result.txt
@@ -0,0 +1 @@
+1
diff --git a/Tests/RunCMake/CMP0057/CMP0057-NEW-stderr.txt b/Tests/RunCMake/CMP0057/CMP0057-NEW-stderr.txt
new file mode 100644
index 0000000000..9607d5460f
--- /dev/null
+++ b/Tests/RunCMake/CMP0057/CMP0057-NEW-stderr.txt
@@ -0,0 +1,4 @@
+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
new file mode 100644
index 0000000000..22dbfb343d
--- /dev/null
+++ b/Tests/RunCMake/CMP0057/CMP0057-NEW.cmake
@@ -0,0 +1,13 @@
+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
new file mode 100644
index 0000000000..ccf4fcb3c5
--- /dev/null
+++ b/Tests/RunCMake/CMP0057/CMP0057-OLD.cmake
@@ -0,0 +1,13 @@
+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
new file mode 100644
index 0000000000..da3a1cbf1b
--- /dev/null
+++ b/Tests/RunCMake/CMP0057/CMP0057-WARN-stderr.txt
@@ -0,0 +1,9 @@
+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
new file mode 100644
index 0000000000..1837968b7c
--- /dev/null
+++ b/Tests/RunCMake/CMP0057/CMP0057-WARN.cmake
@@ -0,0 +1,11 @@
+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
new file mode 100644
index 0000000000..8ce02f96ca
--- /dev/null
+++ b/Tests/RunCMake/CMP0057/CMP0057-once_is_ok.cmake
@@ -0,0 +1,8 @@
+cmake_policy(SET CMP0057 NEW)
+
+add_custom_command(OUTPUT out1
+  COMMAND ${CMAKE_COMMAND} -E echo out1
+  MAIN_DEPENDENCY input.txt
+)
+
+add_custom_target(mytarget1 ALL DEPENDS out1)
diff --git a/Tests/RunCMake/CMP0057/CMakeLists.txt b/Tests/RunCMake/CMP0057/CMakeLists.txt
new file mode 100644
index 0000000000..ef2163c298
--- /dev/null
+++ b/Tests/RunCMake/CMP0057/CMakeLists.txt
@@ -0,0 +1,3 @@
+cmake_minimum_required(VERSION 3.1)
+project(${RunCMake_TEST} NONE)
+include(${RunCMake_TEST}.cmake)
diff --git a/Tests/RunCMake/CMP0057/RunCMakeTest.cmake b/Tests/RunCMake/CMP0057/RunCMakeTest.cmake
new file mode 100644
index 0000000000..f79235f98c
--- /dev/null
+++ b/Tests/RunCMake/CMP0057/RunCMakeTest.cmake
@@ -0,0 +1,7 @@
+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
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/Tests/RunCMake/CMP0057/input.txt
diff --git a/Tests/RunCMake/CMakeLists.txt b/Tests/RunCMake/CMakeLists.txt
index eb42057402..3bc96c982d 100644
--- a/Tests/RunCMake/CMakeLists.txt
+++ b/Tests/RunCMake/CMakeLists.txt
@@ -63,6 +63,7 @@ add_RunCMake_test(CMP0051)
 add_RunCMake_test(CMP0053)
 add_RunCMake_test(CMP0054)
 add_RunCMake_test(CMP0055)
+add_RunCMake_test(CMP0057)
 add_RunCMake_test(CTest)
 
 if(NOT CMake_TEST_EXTERNAL_CMAKE)