From e07ea14e31e1d91632bdd5d56124ab394042f0d1 Mon Sep 17 00:00:00 2001
From: Ken Martin <ken.martin@kitware.com>
Date: Wed, 2 Jan 2002 16:46:08 -0500
Subject: [PATCH] added exists option for if statement

---
 Source/cmElseCommand.cxx | 8 ++++++++
 Source/cmIfCommand.cxx   | 8 ++++++++
 Source/cmIfCommand.h     | 4 +++-
 3 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/Source/cmElseCommand.cxx b/Source/cmElseCommand.cxx
index 7daca42cf5..c04dbeb4ee 100644
--- a/Source/cmElseCommand.cxx
+++ b/Source/cmElseCommand.cxx
@@ -73,6 +73,14 @@ bool cmElseCommand::InitialPass(std::vector<std::string> const& args)
       }
     }
 
+  if (args.size() == 2 && (args[0] == "EXISTS"))
+    {
+    if(cmSystemTools::FileExists(args[1].c_str()))
+      {
+      f = new cmIfFunctionBlocker();
+      }
+    }
+
   if (args.size() == 2 && (args[0] == "NOT"))
     {
     def = m_Makefile->GetDefinition(args[1].c_str());
diff --git a/Source/cmIfCommand.cxx b/Source/cmIfCommand.cxx
index f549e5cebd..83da56f599 100644
--- a/Source/cmIfCommand.cxx
+++ b/Source/cmIfCommand.cxx
@@ -134,6 +134,14 @@ bool cmIfCommand::InitialPass(std::vector<std::string> const& args)
       }
     }
 
+  if (args.size() == 2 && (args[0] == "EXISTS"))
+    {
+    if(!cmSystemTools::FileExists(args[1].c_str()))
+      {
+      f = new cmIfFunctionBlocker();
+      }
+    }
+
   if (args.size() == 3 && (args[1] == "AND"))
     {
     def = m_Makefile->GetDefinition(args[0].c_str());
diff --git a/Source/cmIfCommand.h b/Source/cmIfCommand.h
index 9d8910fa8a..d663253dcd 100644
--- a/Source/cmIfCommand.h
+++ b/Source/cmIfCommand.h
@@ -115,7 +115,9 @@ public:
     return
       "IF (define) Starts an if block. Optionally it can be invoked "
       "using (NOT define) (def AND def2) (def OR def2) (def MATCHES def2) "
-      "MATCHES checks if def matches the regular expression def2 ";
+      "(COMMAND cmd) (EXISTS file) MATCHES checks if def matches the "
+      "regular expression def2. COMMAND checks if the cmake command cmd "
+      "is in this cmake executable. EXISTS file checks if file exists";
     }
   
   cmTypeMacro(cmIfCommand, cmCommand);