Merge topic 'backward-compatibility'

f2eee72f add_custom_command: Disallow use of SOURCE signatures.
c248a437 Add policy CMP0049 to avoid variable expansion in source lists

34 files changed, 250 insertions, 0 deletions

diff --git a/Help/manual/cmake-policies.7.rst b/Help/manual/cmake-policies.7.rst
index 972a9f8..8650a58 100644
--- a/Help/manual/cmake-policies.7.rst
+++ b/Help/manual/cmake-policies.7.rst
@@ -100,3 +100,5 @@ All Policies
    /policy/CMP0046
    /policy/CMP0047
    /policy/CMP0048
+   /policy/CMP0049
+   /policy/CMP0050
diff --git a/Help/policy/CMP0049.rst b/Help/policy/CMP0049.rst
new file mode 100644
index 0000000..5c8d4a8
--- /dev/null
+++ b/Help/policy/CMP0049.rst
@@ -0,0 +1,23 @@
+CMP0049
+-------
+
+Do not expand variables in target source entries.
+
+CMake 2.8.12 and lower performed and extra layer of variable expansion
+when evaluating source file names:
+
+.. code-block:: cmake
+
+  set(a_source foo.c)
+  add_executable(foo \${a_source})
+
+This was undocumented behavior.
+
+The OLD behavior for this policy is to expand such variables when processing
+the target sources.  The NEW behavior for this policy is to issue an error
+if such variables need to be expanded.
+
+This policy was introduced in CMake version 3.0.
+CMake version |release| warns when the policy is not set and uses
+OLD behavior.  Use the cmake_policy command to set it to OLD or
+NEW explicitly.
diff --git a/Help/policy/CMP0050.rst b/Help/policy/CMP0050.rst
new file mode 100644
index 0000000..76ae0aa
--- /dev/null
+++ b/Help/policy/CMP0050.rst
@@ -0,0 +1,18 @@
+CMP0050
+-------
+
+Disallow add_custom_command SOURCE signatures.
+
+CMake 2.8.12 and lower allowed a signature for :command:`add_custom_command`
+which specified an input to a command.  This was undocumented behavior.
+Modern use of CMake associates custom commands with their output, rather
+than their input.
+
+The OLD behavior for this policy is to allow the use of
+:command:`add_custom_command` SOURCE signatures.  The NEW behavior for this
+policy is to issue an error if such a signature is used.
+
+This policy was introduced in CMake version 3.0.
+CMake version |release| warns when the policy is not set and uses
+OLD behavior.  Use the cmake_policy command to set it to OLD or
+NEW explicitly.
diff --git a/Help/release/3.0.rst b/Help/release/3.0.rst
index bef7715..45f7635 100644
--- a/Help/release/3.0.rst
+++ b/Help/release/3.0.rst
@@ -322,6 +322,14 @@ New Diagnostics
   messages up front and stops processing when no working compiler
   is known to be available.
 
+* Target sources specified with the :command:`add_library` or
+  :command:`add_executable` command learned to reject items which
+  require an undocumented extra layer of variable expansion.
+  See policy :policy:`CMP0049`.
+
+* Use of :command:`add_custom_command` undocumented ``SOURCE``
+  signatures now results in an error.  See policy :policy:`CMP0050`.
+
 Deprecated and Removed Features
 ===============================
 
diff --git a/Source/cmAddCustomCommandCommand.cxx b/Source/cmAddCustomCommandCommand.cxx
index 5634849..3de04f5 100644
--- a/Source/cmAddCustomCommandCommand.cxx
+++ b/Source/cmAddCustomCommandCommand.cxx
@@ -344,6 +344,36 @@ bool cmAddCustomCommandCommand
     }
   else
     {
+    bool issueMessage = true;
+    cmOStringStream e;
+    cmake::MessageType messageType = cmake::AUTHOR_WARNING;
+    switch(this->Makefile->GetPolicyStatus(cmPolicies::CMP0050))
+    {
+    case cmPolicies::WARN:
+      e << (this->Makefile->GetPolicies()
+                ->GetPolicyWarning(cmPolicies::CMP0050)) << "\n";
+      break;
+    case cmPolicies::OLD:
+      issueMessage = false;
+      break;
+    case cmPolicies::REQUIRED_ALWAYS:
+    case cmPolicies::REQUIRED_IF_USED:
+    case cmPolicies::NEW:
+      messageType = cmake::FATAL_ERROR;
+      break;
+    }
+
+    if (issueMessage)
+      {
+      e << "The SOURCE signatures of add_custom_command are no longer "
+           "supported.";
+      this->Makefile->IssueMessage(messageType, e.str().c_str());
+      if (messageType == cmake::FATAL_ERROR)
+        {
+        return false;
+        }
+      }
+
     // Use the old-style mode for backward compatibility.
     this->Makefile->AddCustomCommandOldStyle(target.c_str(), outputs, depends,
                                              source.c_str(), commandLines,
diff --git a/Source/cmPolicies.cxx b/Source/cmPolicies.cxx
index 9cfa1e4..93072f5 100644
--- a/Source/cmPolicies.cxx
+++ b/Source/cmPolicies.cxx
@@ -333,6 +333,16 @@ cmPolicies::cmPolicies()
     CMP0048, "CMP0048",
     "project() command manages VERSION variables.",
     3,0,0, cmPolicies::WARN);
+
+  this->DefinePolicy(
+    CMP0049, "CMP0049",
+    "Do not expand variables in target source entries.",
+    3,0,0, cmPolicies::WARN);
+
+  this->DefinePolicy(
+    CMP0050, "CMP0050",
+    "Disallow add_custom_command SOURCE signatures.",
+    3,0,0, cmPolicies::WARN);
 }
 
 cmPolicies::~cmPolicies()
diff --git a/Source/cmPolicies.h b/Source/cmPolicies.h
index f9a4768..b77235d 100644
--- a/Source/cmPolicies.h
+++ b/Source/cmPolicies.h
@@ -102,6 +102,8 @@ public:
     CMP0046, ///< Error on non-existent dependency in add_dependencies
     CMP0047, ///< Use QCC compiler id for the qcc drivers on QNX.
     CMP0048, ///< project() command manages VERSION variables
+    CMP0049, ///< Do not expand variables in target source entries
+    CMP0050, ///< Disallow add_custom_command SOURCE signatures
 
     /** \brief Always the last entry.
      *
diff --git a/Source/cmTarget.cxx b/Source/cmTarget.cxx
index d440f7c..3e96b69 100644
--- a/Source/cmTarget.cxx
+++ b/Source/cmTarget.cxx
@@ -590,6 +590,38 @@ cmSourceFile* cmTarget::AddSource(const char* s)
   // For backwards compatibility replace varibles in source names.
   // This should eventually be removed.
   this->Makefile->ExpandVariablesInString(src);
+  if (src != s)
+    {
+    cmOStringStream e;
+    bool noMessage = false;
+    cmake::MessageType messageType = cmake::AUTHOR_WARNING;
+    switch(this->Makefile->GetPolicyStatus(cmPolicies::CMP0049))
+      {
+      case cmPolicies::WARN:
+        e << (this->Makefile->GetPolicies()
+              ->GetPolicyWarning(cmPolicies::CMP0049)) << "\n";
+        break;
+      case cmPolicies::OLD:
+        noMessage = true;
+        break;
+      case cmPolicies::REQUIRED_ALWAYS:
+      case cmPolicies::REQUIRED_IF_USED:
+      case cmPolicies::NEW:
+        messageType = cmake::FATAL_ERROR;
+      }
+    if (!noMessage)
+      {
+      e << "Legacy variable expansion in source file \""
+        << s << "\" expanded to \"" << src << "\" in target \""
+        << this->GetName() << "\".  This behavior will be removed in a "
+        "future version of CMake.";
+      this->Makefile->IssueMessage(messageType, e.str().c_str());
+      if (messageType == cmake::FATAL_ERROR)
+        {
+        return 0;
+        }
+      }
+    }
 
   cmSourceFile* sf = this->Makefile->GetOrCreateSource(src.c_str());
   this->AddSourceFile(sf);
diff --git a/Tests/RunCMake/CMP0049/CMP0049-NEW-result.txt b/Tests/RunCMake/CMP0049/CMP0049-NEW-result.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/Tests/RunCMake/CMP0049/CMP0049-NEW-result.txt
@@ -0,0 +1 @@
+1
diff --git a/Tests/RunCMake/CMP0049/CMP0049-NEW-stderr.txt b/Tests/RunCMake/CMP0049/CMP0049-NEW-stderr.txt
new file mode 100644
index 0000000..ff787e8
--- /dev/null
+++ b/Tests/RunCMake/CMP0049/CMP0049-NEW-stderr.txt
@@ -0,0 +1,6 @@
+CMake Error at CMP0049-NEW.cmake:5 \(add_library\):
+  Legacy variable expansion in source file "\${tgt_srcs}" expanded to
+  "empty.cpp" in target "tgt".  This behavior will be removed in a future
+  version of CMake.
+Call Stack \(most recent call first\):
+  CMakeLists.txt:3 \(include\)
diff --git a/Tests/RunCMake/CMP0049/CMP0049-NEW.cmake b/Tests/RunCMake/CMP0049/CMP0049-NEW.cmake
new file mode 100644
index 0000000..85b5aa8
--- /dev/null
+++ b/Tests/RunCMake/CMP0049/CMP0049-NEW.cmake
@@ -0,0 +1,5 @@
+
+cmake_policy(SET CMP0049 NEW)
+
+set(tgt_srcs empty.cpp)
+add_library(tgt \${tgt_srcs})
diff --git a/Tests/RunCMake/CMP0049/CMP0049-OLD-result.txt b/Tests/RunCMake/CMP0049/CMP0049-OLD-result.txt
new file mode 100644
index 0000000..573541a
--- /dev/null
+++ b/Tests/RunCMake/CMP0049/CMP0049-OLD-result.txt
@@ -0,0 +1 @@
+0
diff --git a/Tests/RunCMake/CMP0049/CMP0049-OLD-stderr.txt b/Tests/RunCMake/CMP0049/CMP0049-OLD-stderr.txt
new file mode 100644
index 0000000..10f3293
--- /dev/null
+++ b/Tests/RunCMake/CMP0049/CMP0049-OLD-stderr.txt
@@ -0,0 +1 @@
+^$
diff --git a/Tests/RunCMake/CMP0049/CMP0049-OLD.cmake b/Tests/RunCMake/CMP0049/CMP0049-OLD.cmake
new file mode 100644
index 0000000..ae6fd3b
--- /dev/null
+++ b/Tests/RunCMake/CMP0049/CMP0049-OLD.cmake
@@ -0,0 +1,5 @@
+
+cmake_policy(SET CMP0049 OLD)
+
+set(tgt_srcs empty.cpp)
+add_library(tgt \${tgt_srcs})
diff --git a/Tests/RunCMake/CMP0049/CMP0049-WARN-result.txt b/Tests/RunCMake/CMP0049/CMP0049-WARN-result.txt
new file mode 100644
index 0000000..573541a
--- /dev/null
+++ b/Tests/RunCMake/CMP0049/CMP0049-WARN-result.txt
@@ -0,0 +1 @@
+0
diff --git a/Tests/RunCMake/CMP0049/CMP0049-WARN-stderr.txt b/Tests/RunCMake/CMP0049/CMP0049-WARN-stderr.txt
new file mode 100644
index 0000000..0cf5ce3
--- /dev/null
+++ b/Tests/RunCMake/CMP0049/CMP0049-WARN-stderr.txt
@@ -0,0 +1,11 @@
+CMake Warning \(dev\) at CMP0049-WARN.cmake:3 \(add_library\):
+  Policy CMP0049 is not set: Do not expand variables in target source
+  entries.  Run "cmake --help-policy CMP0049" for policy details.  Use the
+  cmake_policy command to set the policy and suppress this warning.
+
+  Legacy variable expansion in source file "\${tgt_srcs}" expanded to
+  "empty.cpp" in target "tgt".  This behavior will be removed in a future
+  version of CMake.
+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/CMP0049/CMP0049-WARN.cmake b/Tests/RunCMake/CMP0049/CMP0049-WARN.cmake
new file mode 100644
index 0000000..ada082e
--- /dev/null
+++ b/Tests/RunCMake/CMP0049/CMP0049-WARN.cmake
@@ -0,0 +1,3 @@
+
+set(tgt_srcs empty.cpp)
+add_library(tgt \${tgt_srcs})
diff --git a/Tests/RunCMake/CMP0049/CMakeLists.txt b/Tests/RunCMake/CMP0049/CMakeLists.txt
new file mode 100644
index 0000000..2f10cb0
--- /dev/null
+++ b/Tests/RunCMake/CMP0049/CMakeLists.txt
@@ -0,0 +1,3 @@
+cmake_minimum_required(VERSION 2.8.12)
+project(${RunCMake_TEST} CXX)
+include(${RunCMake_TEST}.cmake NO_POLICY_SCOPE)
diff --git a/Tests/RunCMake/CMP0049/RunCMakeTest.cmake b/Tests/RunCMake/CMP0049/RunCMakeTest.cmake
new file mode 100644
index 0000000..a8aa9d9
--- /dev/null
+++ b/Tests/RunCMake/CMP0049/RunCMakeTest.cmake
@@ -0,0 +1,5 @@
+include(RunCMake)
+
+run_cmake(CMP0049-OLD)
+run_cmake(CMP0049-NEW)
+run_cmake(CMP0049-WARN)
diff --git a/Tests/RunCMake/CMP0049/empty.cpp b/Tests/RunCMake/CMP0049/empty.cpp
new file mode 100644
index 0000000..bfbbdde
--- /dev/null
+++ b/Tests/RunCMake/CMP0049/empty.cpp
@@ -0,0 +1,7 @@
+#ifdef _WIN32
+__declspec(dllexport)
+#endif
+int empty()
+{
+  return 0;
+}
diff --git a/Tests/RunCMake/CMP0050/CMP0050-NEW-result.txt b/Tests/RunCMake/CMP0050/CMP0050-NEW-result.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/Tests/RunCMake/CMP0050/CMP0050-NEW-result.txt
@@ -0,0 +1 @@
+1
diff --git a/Tests/RunCMake/CMP0050/CMP0050-NEW-stderr.txt b/Tests/RunCMake/CMP0050/CMP0050-NEW-stderr.txt
new file mode 100644
index 0000000..e913b3f
--- /dev/null
+++ b/Tests/RunCMake/CMP0050/CMP0050-NEW-stderr.txt
@@ -0,0 +1,4 @@
+CMake Error at CMP0050-NEW.cmake:5 \(add_custom_command\):
+  The SOURCE signatures of add_custom_command are no longer supported.
+Call Stack \(most recent call first\):
+  CMakeLists.txt:3 \(include\)
diff --git a/Tests/RunCMake/CMP0050/CMP0050-NEW.cmake b/Tests/RunCMake/CMP0050/CMP0050-NEW.cmake
new file mode 100644
index 0000000..cdc65b8
--- /dev/null
+++ b/Tests/RunCMake/CMP0050/CMP0050-NEW.cmake
@@ -0,0 +1,13 @@
+
+cmake_policy(SET CMP0050 NEW)
+
+add_library(empty empty.cpp)
+add_custom_command(
+  TARGET empty
+  SOURCE ${CMAKE_CURRENT_SOURCE_DIR}/input.h.in
+  COMMAND ${CMAKE_COMMAND}
+  ARGS -E copy ${CMAKE_CURRENT_SOURCE_DIR}/input.h.in
+               ${CMAKE_CURRENT_BINARY_DIR}/input.h
+  OUTPUTS ${CMAKE_CURRENT_BINARY_DIR}/input.h
+  DEPENDS ${CMAKE_COMMAND}
+)
diff --git a/Tests/RunCMake/CMP0050/CMP0050-OLD-result.txt b/Tests/RunCMake/CMP0050/CMP0050-OLD-result.txt
new file mode 100644
index 0000000..573541a
--- /dev/null
+++ b/Tests/RunCMake/CMP0050/CMP0050-OLD-result.txt
@@ -0,0 +1 @@
+0
diff --git a/Tests/RunCMake/CMP0050/CMP0050-OLD-stderr.txt b/Tests/RunCMake/CMP0050/CMP0050-OLD-stderr.txt
new file mode 100644
index 0000000..10f3293
--- /dev/null
+++ b/Tests/RunCMake/CMP0050/CMP0050-OLD-stderr.txt
@@ -0,0 +1 @@
+^$
diff --git a/Tests/RunCMake/CMP0050/CMP0050-OLD.cmake b/Tests/RunCMake/CMP0050/CMP0050-OLD.cmake
new file mode 100644
index 0000000..efb37e5
--- /dev/null
+++ b/Tests/RunCMake/CMP0050/CMP0050-OLD.cmake
@@ -0,0 +1,13 @@
+
+cmake_policy(SET CMP0050 OLD)
+
+add_library(empty empty.cpp)
+add_custom_command(
+  TARGET empty
+  SOURCE ${CMAKE_CURRENT_SOURCE_DIR}/input.h.in
+  COMMAND ${CMAKE_COMMAND}
+  ARGS -E copy ${CMAKE_CURRENT_SOURCE_DIR}/input.h.in
+               ${CMAKE_CURRENT_BINARY_DIR}/input.h
+  OUTPUTS ${CMAKE_CURRENT_BINARY_DIR}/input.h
+  DEPENDS ${CMAKE_COMMAND}
+)
diff --git a/Tests/RunCMake/CMP0050/CMP0050-WARN-result.txt b/Tests/RunCMake/CMP0050/CMP0050-WARN-result.txt
new file mode 100644
index 0000000..573541a
--- /dev/null
+++ b/Tests/RunCMake/CMP0050/CMP0050-WARN-result.txt
@@ -0,0 +1 @@
+0
diff --git a/Tests/RunCMake/CMP0050/CMP0050-WARN-stderr.txt b/Tests/RunCMake/CMP0050/CMP0050-WARN-stderr.txt
new file mode 100644
index 0000000..c88d595
--- /dev/null
+++ b/Tests/RunCMake/CMP0050/CMP0050-WARN-stderr.txt
@@ -0,0 +1,9 @@
+CMake Warning \(dev\) at CMP0050-WARN.cmake:3 \(add_custom_command\):
+  Policy CMP0050 is not set: Disallow add_custom_command SOURCE signatures.
+  Run "cmake --help-policy CMP0050" for policy details.  Use the cmake_policy
+  command to set the policy and suppress this warning.
+
+  The SOURCE signatures of add_custom_command are no longer supported.
+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/CMP0050/CMP0050-WARN.cmake b/Tests/RunCMake/CMP0050/CMP0050-WARN.cmake
new file mode 100644
index 0000000..e57230e
--- /dev/null
+++ b/Tests/RunCMake/CMP0050/CMP0050-WARN.cmake
@@ -0,0 +1,11 @@
+
+add_library(empty empty.cpp)
+add_custom_command(
+  TARGET empty
+  SOURCE ${CMAKE_CURRENT_SOURCE_DIR}/input.h.in
+  COMMAND ${CMAKE_COMMAND}
+  ARGS -E copy ${CMAKE_CURRENT_SOURCE_DIR}/input.h.in
+               ${CMAKE_CURRENT_BINARY_DIR}/input.h
+  OUTPUTS ${CMAKE_CURRENT_BINARY_DIR}/input.h
+  DEPENDS ${CMAKE_COMMAND}
+)
diff --git a/Tests/RunCMake/CMP0050/CMakeLists.txt b/Tests/RunCMake/CMP0050/CMakeLists.txt
new file mode 100644
index 0000000..2f10cb0
--- /dev/null
+++ b/Tests/RunCMake/CMP0050/CMakeLists.txt
@@ -0,0 +1,3 @@
+cmake_minimum_required(VERSION 2.8.12)
+project(${RunCMake_TEST} CXX)
+include(${RunCMake_TEST}.cmake NO_POLICY_SCOPE)
diff --git a/Tests/RunCMake/CMP0050/RunCMakeTest.cmake b/Tests/RunCMake/CMP0050/RunCMakeTest.cmake
new file mode 100644
index 0000000..b7de284
--- /dev/null
+++ b/Tests/RunCMake/CMP0050/RunCMakeTest.cmake
@@ -0,0 +1,5 @@
+include(RunCMake)
+
+run_cmake(CMP0050-OLD)
+run_cmake(CMP0050-NEW)
+run_cmake(CMP0050-WARN)
diff --git a/Tests/RunCMake/CMP0050/empty.cpp b/Tests/RunCMake/CMP0050/empty.cpp
new file mode 100644
index 0000000..182ea29
--- /dev/null
+++ b/Tests/RunCMake/CMP0050/empty.cpp
@@ -0,0 +1,10 @@
+
+#include "input.h"
+
+#ifdef _WIN32
+__declspec(dllexport)
+#endif
+int empty()
+{
+  return 0;
+}
diff --git a/Tests/RunCMake/CMP0050/input.h.in b/Tests/RunCMake/CMP0050/input.h.in
new file mode 100644
index 0000000..d8c5d26
--- /dev/null
+++ b/Tests/RunCMake/CMP0050/input.h.in
@@ -0,0 +1,2 @@
+
+#define INPUT
diff --git a/Tests/RunCMake/CMakeLists.txt b/Tests/RunCMake/CMakeLists.txt
index c29b736..9bb097b 100644
--- a/Tests/RunCMake/CMakeLists.txt
+++ b/Tests/RunCMake/CMakeLists.txt
@@ -32,6 +32,8 @@ endif()
 add_RunCMake_test(CMP0043)
 add_RunCMake_test(CMP0045)
 add_RunCMake_test(CMP0046)
+add_RunCMake_test(CMP0049)
+add_RunCMake_test(CMP0050)
 add_RunCMake_test(CTest)
 if(UNIX AND "${CMAKE_TEST_GENERATOR}" MATCHES "Unix Makefiles")
   add_RunCMake_test(CompilerChange)