Teach CMake Policies about tweak version component

Add the [.tweak] version component throughout the policy implementation.
Document all components for the cmake_policy(VERSION) command.  Record
the tweak level in which each policy was introduced (0 for all current
policies).  In generated documentation we report the tweak level only if
it is not zero.  This preserves existing documentation.

3 files changed, 53 insertions, 29 deletions

diff --git a/Source/cmCMakePolicyCommand.h b/Source/cmCMakePolicyCommand.h
index ffd0f44..b326865 100644
--- a/Source/cmCMakePolicyCommand.h
+++ b/Source/cmCMakePolicyCommand.h
@@ -80,7 +80,7 @@ public:
       "behavior.  "
       "While setting policies individually is supported, we encourage "
       "projects to set policies based on CMake versions.\n"
-      "  cmake_policy(VERSION major.minor[.patch])\n"
+      "  cmake_policy(VERSION major.minor[.patch[.tweak]])\n"
       "Specify that the current CMake list file is written for the "
       "given version of CMake.  "
       "All policies introduced in the specified version or earlier "
diff --git a/Source/cmPolicies.cxx b/Source/cmPolicies.cxx
index 2d41d40..69d3e51 100644
--- a/Source/cmPolicies.cxx
+++ b/Source/cmPolicies.cxx
@@ -3,6 +3,7 @@
 #include "cmMakefile.h"
 #include "cmSourceFile.h"
 #include "cmVersion.h"
+#include "cmVersionMacros.h"
 #include <map>
 #include <set>
 #include <queue>
@@ -22,6 +23,7 @@ public:
             unsigned int majorVersionIntroduced,
             unsigned int minorVersionIntroduced,
             unsigned int patchVersionIntroduced,
+            unsigned int tweakVersionIntroduced,
             cmPolicies::PolicyStatus status)
   {
     if (!idString || !shortDescription || ! longDescription)
@@ -37,21 +39,26 @@ public:
     this->MajorVersionIntroduced = majorVersionIntroduced;
     this->MinorVersionIntroduced = minorVersionIntroduced;
     this->PatchVersionIntroduced = patchVersionIntroduced;
+    this->TweakVersionIntroduced = tweakVersionIntroduced;
     this->Status = status;
   }
 
   std::string GetVersionString()
   {
-    cmOStringStream error;
-    error << this->MajorVersionIntroduced << "." <<
-      this->MinorVersionIntroduced << "." <<
-      this->PatchVersionIntroduced; 
-    return error.str();
+    cmOStringStream v;
+    v << this->MajorVersionIntroduced << "." << this->MinorVersionIntroduced;
+    v << "." << this->PatchVersionIntroduced;
+    if(this->TweakVersionIntroduced > 0)
+      {
+      v << "." << this->TweakVersionIntroduced;
+      }
+    return v.str();
   }
 
   bool IsPolicyNewerThan(unsigned int majorV, 
                          unsigned int minorV,
-                         unsigned int patchV)
+                         unsigned int patchV,
+                         unsigned int tweakV)
   {
     if (majorV < this->MajorVersionIntroduced)
     {
@@ -69,7 +76,15 @@ public:
     {
       return false;
     }
-    return (patchV < this->PatchVersionIntroduced);
+    if (patchV < this->PatchVersionIntroduced)
+    {
+      return true;
+    }
+    if (patchV > this->PatchVersionIntroduced)
+    {
+      return false;
+    }
+    return (tweakV < this->TweakVersionIntroduced);
   }
   
   cmPolicies::PolicyID ID;
@@ -79,6 +94,7 @@ public:
   unsigned int MajorVersionIntroduced;
   unsigned int MinorVersionIntroduced;
   unsigned int PatchVersionIntroduced;
+  unsigned int TweakVersionIntroduced;
   cmPolicies::PolicyStatus Status;
 };
 
@@ -110,7 +126,7 @@ cmPolicies::cmPolicies()
     "The NEW behavior is to issue an error instead of a warning.  "
     "An included file may set CMP0000 explicitly to affect how this "
     "policy is enforced for the main CMakeLists.txt file.",
-    2,6,0, cmPolicies::WARN
+    2,6,0,0, cmPolicies::WARN
     );
 
   this->DefinePolicy(
@@ -126,7 +142,7 @@ cmPolicies::cmPolicies()
     "and the cmake_policy command.  "
     "However, CMake must still check CMAKE_BACKWARDS_COMPATIBILITY for "
     "projects written for CMake 2.4 and below.",
-    2,6,0, cmPolicies::WARN
+    2,6,0,0, cmPolicies::WARN
     );
 
   this->DefinePolicy(
@@ -148,7 +164,7 @@ cmPolicies::cmPolicies()
     "Custom targets must simply have globally unique names (unless one "
     "uses the global property ALLOW_DUPLICATE_CUSTOM_TARGETS with a "
     "Makefiles generator).",
-    2,6,0, cmPolicies::WARN
+    2,6,0,0, cmPolicies::WARN
     );
 
   this->DefinePolicy(
@@ -213,7 +229,7 @@ cmPolicies::cmPolicies()
     "Note that the warning for this policy will be issued for at most "
     "one target.  This avoids flooding users with messages for every "
     "target when setting the policy once will probably fix all targets.",
-    2,6,0, cmPolicies::WARN);
+    2,6,0,0, cmPolicies::WARN);
 
   this->DefinePolicy(
     CMP0004, "CMP0004",
@@ -229,7 +245,7 @@ cmPolicies::cmPolicies()
     "The setting for this policy used when checking the library names is "
     "that in effect when the target is created by an add_executable or "
     "add_library command.",
-    2,6,0, cmPolicies::WARN);
+    2,6,0,0, cmPolicies::WARN);
 
   this->DefinePolicy(
     CMP0005, "CMP0005",
@@ -250,7 +266,7 @@ cmPolicies::cmPolicies()
     "for all native build tools automatically.  "
     "See documentation of the COMPILE_DEFINITIONS target property for "
     "limitations of the escaping implementation.",
-    2,6,0, cmPolicies::WARN);
+    2,6,0,0, cmPolicies::WARN);
 
   this->DefinePolicy(
     CMP0006, "CMP0006",
@@ -268,7 +284,7 @@ cmPolicies::cmPolicies()
     "DESTINATION if a BUNDLE DESTINATION is not given.  "
     "The NEW behavior for this policy is to produce an error if a bundle "
     "target is installed without a BUNDLE DESTINATION.",
-    2,6,0, cmPolicies::WARN);
+    2,6,0,0, cmPolicies::WARN);
   
   this->DefinePolicy(
     CMP0007, "CMP0007",
@@ -280,7 +296,7 @@ cmPolicies::cmPolicies()
     "The OLD behavior for this policy is to ignore empty list elements. "
     "The NEW behavior for this policy is to correctly count empty "
     "elements in a list. ",
-    2,6,0, cmPolicies::WARN);
+    2,6,0,0, cmPolicies::WARN);
 
   this->DefinePolicy(
     CMP0008, "CMP0008",
@@ -306,7 +322,7 @@ cmPolicies::cmPolicies()
     "path and ask the linker to search for it.  "
     "The NEW behavior for this policy is to trust the given path and "
     "pass it directly to the native build tool unchanged.",
-    2,6,1, cmPolicies::WARN);
+    2,6,1,0, cmPolicies::WARN);
 
   this->DefinePolicy(
     CMP0009, "CMP0009",
@@ -322,7 +338,7 @@ cmPolicies::cmPolicies()
     "The NEW behavior for this policy is not to follow the symlinks "
     "by default, but only if FOLLOW_SYMLINKS is given as an additional "
     "argument to the FILE command.",
-    2,6,2, cmPolicies::WARN);
+    2,6,2,0, cmPolicies::WARN);
 
   this->DefinePolicy(
     CMP0010, "CMP0010",
@@ -334,7 +350,7 @@ cmPolicies::cmPolicies()
     "The OLD behavior for this policy is to warn about the error, leave "
     "the string untouched, and continue. "
     "The NEW behavior for this policy is to report an error.",
-    2,6,3, cmPolicies::WARN);
+    2,6,3,0, cmPolicies::WARN);
 
   this->DefinePolicy(
     CMP0011, "CMP0011",
@@ -354,7 +370,7 @@ cmPolicies::cmPolicies()
     "include() and find_package() commands.  "
     "The NEW behavior for this policy is to allow the commands to do their "
     "default cmake_policy PUSH and POP.",
-    2,6,3, cmPolicies::WARN);
+    2,6,3,0, cmPolicies::WARN);
 
     this->DefinePolicy(
     CMP0012, "CMP0012",
@@ -376,7 +392,7 @@ cmPolicies::cmPolicies()
     "named like numbers and boolean constants. "
     "The NEW behavior for this policy is to recognize numbers and "
     "boolean constants without dereferencing variables with such names.",
-    2,8,0, cmPolicies::WARN);
+    2,8,0,0, cmPolicies::WARN);
 
     this->DefinePolicy(
     CMP0013, "CMP0013",
@@ -393,7 +409,7 @@ cmPolicies::cmPolicies()
     "directories.  "
     "The NEW behavior for this policy is to disallow duplicate binary "
     "directories with an error.",
-    2,8,0, cmPolicies::WARN);
+    2,8,0,0, cmPolicies::WARN);
 
     this->DefinePolicy(
     CMP0014, "CMP0014",
@@ -405,7 +421,7 @@ cmPolicies::cmPolicies()
     "the case is an error.  "
     "The OLD behavior for this policy is to silently ignore the problem.  "
     "The NEW behavior for this policy is to report an error.",
-    2,8,0, cmPolicies::WARN);
+    2,8,0,0, cmPolicies::WARN);
 
     this->DefinePolicy(
     CMP0015, "CMP0015",
@@ -420,7 +436,7 @@ cmPolicies::cmPolicies()
     "The NEW behavior for this policy is to convert relative paths to "
     "absolute paths by appending the relative path to "
     "CMAKE_CURRENT_SOURCE_DIR.",
-    2,8,1, cmPolicies::WARN);
+    2,8,1,0, cmPolicies::WARN);
 }
 
 cmPolicies::~cmPolicies()
@@ -441,6 +457,7 @@ void cmPolicies::DefinePolicy(cmPolicies::PolicyID iD,
                               unsigned int majorVersionIntroduced,
                               unsigned int minorVersionIntroduced,
                               unsigned int patchVersionIntroduced,
+                              unsigned int tweakVersionIntroduced,
                               cmPolicies::PolicyStatus status)
 {
   // a policy must be unique and can only be defined once
@@ -457,6 +474,7 @@ void cmPolicies::DefinePolicy(cmPolicies::PolicyID iD,
                                     majorVersionIntroduced,
                                     minorVersionIntroduced,
                                     patchVersionIntroduced,
+                                    tweakVersionIntroduced,
                                     status);
   this->PolicyStringMap[idString] = iD;
 }
@@ -475,14 +493,15 @@ bool cmPolicies::ApplyPolicyVersion(cmMakefile *mf,
   unsigned int majorVer = 2;
   unsigned int minorVer = 0;
   unsigned int patchVer = 0;
+  unsigned int tweakVer = 0;
 
   // parse the string
-  if(sscanf(ver.c_str(), "%u.%u.%u",
-            &majorVer, &minorVer, &patchVer) < 2)
+  if(sscanf(ver.c_str(), "%u.%u.%u.%u",
+            &majorVer, &minorVer, &patchVer, &tweakVer) < 2)
     {
     cmOStringStream e;
     e << "Invalid policy version value \"" << ver << "\".  "
-      << "A numeric major.minor[.patch] must be given.";
+      << "A numeric major.minor[.patch[.tweak]] must be given.";
     mf->IssueMessage(cmake::FATAL_ERROR, e.str());
     return false;
     }
@@ -510,7 +529,11 @@ bool cmPolicies::ApplyPolicyVersion(cmMakefile *mf,
        minorVer > cmVersion::GetMinorVersion()) ||
       (majorVer == cmVersion::GetMajorVersion() &&
        minorVer == cmVersion::GetMinorVersion() &&
-       patchVer > cmVersion::GetPatchVersion()))
+       patchVer > cmVersion::GetPatchVersion()) ||
+      (majorVer == cmVersion::GetMajorVersion() &&
+       minorVer == cmVersion::GetMinorVersion() &&
+       patchVer == cmVersion::GetPatchVersion() &&
+       tweakVer > cmVersion::GetTweakVersion()))
     {
     cmOStringStream e;
     e << "An attempt was made to set the policy version of CMake to \""
@@ -528,7 +551,7 @@ bool cmPolicies::ApplyPolicyVersion(cmMakefile *mf,
     = this->Policies.begin();
   for (;i != this->Policies.end(); ++i)
   {
-    if (i->second->IsPolicyNewerThan(majorVer,minorVer,patchVer))
+  if (i->second->IsPolicyNewerThan(majorVer,minorVer,patchVer,tweakVer))
     {
       if(i->second->Status == cmPolicies::REQUIRED_ALWAYS)
       {
diff --git a/Source/cmPolicies.h b/Source/cmPolicies.h
index aaa3ac0..23064dc 100644
--- a/Source/cmPolicies.h
+++ b/Source/cmPolicies.h
@@ -72,6 +72,7 @@ public:
                     unsigned int majorVersionIntroduced,
                     unsigned int minorVersionIntroduced,
                     unsigned int patchVersionIntroduced,
+                    unsigned int tweakVersionIntroduced,
                     cmPolicies::PolicyStatus status);
 
   ///! Set a policy level for this listfile