From d1a9c93119958a1a394fe0dde5814cd6a8f3f748 Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Mon, 23 Oct 2006 13:37:24 -0400
Subject: ENH: Patch from Alex to provide nicer syntax for FILE_IS_NEWER. 
 Using name IS_NEWER_THAN so old syntax will continue to work.

---
 Source/cmIfCommand.cxx              | 23 +++++++++++++++++++++++
 Source/cmIfCommand.h                |  1 +
 Tests/StringFileTest/CMakeLists.txt |  3 +++
 3 files changed, 27 insertions(+)

diff --git a/Source/cmIfCommand.cxx b/Source/cmIfCommand.cxx
index 722cc78..1553171 100644
--- a/Source/cmIfCommand.cxx
+++ b/Source/cmIfCommand.cxx
@@ -493,6 +493,29 @@ bool cmIfCommand::IsTrue(const std::vector<std::string> &args,
         reducible = 1;
         }
 
+      // is file A newer than file B
+      if (argP1 != newArgs.end() && argP2 != newArgs.end() &&
+          *(argP1) == "IS_NEWER_THAN")
+        {
+        int fileIsNewer=0;
+        bool success=cmSystemTools::FileTimeCompare(arg->c_str(),
+            (argP2)->c_str(),
+            &fileIsNewer);
+        if(success==false || fileIsNewer==1 || fileIsNewer==0)
+          {
+          *arg = "1";
+          }
+        else
+          {
+          *arg = "0";
+          }
+        newArgs.erase(argP2);
+        newArgs.erase(argP1);
+        argP1 = arg;
+        IncrementArguments(newArgs,argP1,argP2);
+        reducible = 1;
+        }
+
       ++arg;
       }
     }
diff --git a/Source/cmIfCommand.h b/Source/cmIfCommand.h
index 1d07248..c7044a3 100644
--- a/Source/cmIfCommand.h
+++ b/Source/cmIfCommand.h
@@ -130,6 +130,7 @@ public:
       "True if the named file or directory exists.  "
       "Behavior is well-defined only for full paths.\n"
       "  IF(FILE_IS_NEWER file1 file2)\n"
+      "  IF(file1 IS_NEWER_THAN file2)\n"
       "True if file1 is newer than file2 or if one of the two files "
       "doesn't exist. "
       "Behavior is well-defined only for full paths.\n"
diff --git a/Tests/StringFileTest/CMakeLists.txt b/Tests/StringFileTest/CMakeLists.txt
index 3376a38..e6288db 100644
--- a/Tests/StringFileTest/CMakeLists.txt
+++ b/Tests/StringFileTest/CMakeLists.txt
@@ -79,6 +79,9 @@ ENDFOREACH(var)
 IF(NOT FILE_IS_NEWER "${file}" "${CMAKE_CURRENT_SOURCE_DIR}/InputFile.h.in")
   MESSAGE(FATAL_ERROR "IF(FILE_IS_NEWER) does not seem to work.")
 ENDIF(NOT FILE_IS_NEWER "${file}" "${CMAKE_CURRENT_SOURCE_DIR}/InputFile.h.in")
+IF(NOT "${file}" IS_NEWER_THAN "${CMAKE_CURRENT_SOURCE_DIR}/InputFile.h.in")
+  MESSAGE(FATAL_ERROR "IF(FILE_IS_NEWER) does not seem to work.")
+ENDIF(NOT "${file}" IS_NEWER_THAN "${CMAKE_CURRENT_SOURCE_DIR}/InputFile.h.in")
 
 # Test configuration of the string
 SET(TEST_DEFINED 123)
-- 
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