[Patch 1/1] BaseTools: Fixed the issue when ToolDefinitionFile is not generated

["Bob Feng" <bob.c.feng@intel.com>]

ToolDefinitionFile is generated by PlatformAutoGen.ToolDefinition()
Code assume ToolDefinition is always called before using
ToolDefinitionFile, but in some cases, it's not true.

This patch is to fix this issue.

Cc: Liming Gao <liming.gao@intel.com>
Signed-off-by: Bob Feng <bob.c.feng@intel.com>
---
 BaseTools/Source/Python/AutoGen/AutoGen.py | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/BaseTools/Source/Python/AutoGen/AutoGen.py b/BaseTools/Source/Python/AutoGen/AutoGen.py
index c0d0ca15867b..5cfaf2141af0 100644
--- a/BaseTools/Source/Python/AutoGen/AutoGen.py
+++ b/BaseTools/Source/Python/AutoGen/AutoGen.py
@@ -1910,22 +1910,25 @@ class PlatformAutoGen(AutoGen):
                         if Attr == "FLAGS":
                             MakeFlags = Value
                     else:
                         ToolsDef += "%s_%s = %s\n" % (Tool, Attr, Value)
             ToolsDef += "\n"
-
-        SaveFileOnChange(self.ToolDefinitionFile, ToolsDef, False)
+        tool_def_file = os.path.join(self.MakeFileDir, "TOOLS_DEF." + self.Arch)
+        SaveFileOnChange(tool_def_file, ToolsDef, False)
         for DllPath in DllPathList:
             os.environ["PATH"] = DllPath + os.pathsep + os.environ["PATH"]
         os.environ["MAKE_FLAGS"] = MakeFlags
 
         return RetVal
 
     ## Return the paths of tools
     @cached_property
     def ToolDefinitionFile(self):
-        return os.path.join(self.MakeFileDir, "TOOLS_DEF." + self.Arch)
+        tool_def_file = os.path.join(self.MakeFileDir, "TOOLS_DEF." + self.Arch)
+        if not os.path.exists(tool_def_file):
+            self.ToolDefinition
+        return tool_def_file
 
     ## Retrieve the toolchain family of given toolchain tag. Default to 'MSFT'.
     @cached_property
     def ToolChainFamily(self):
         ToolDefinition = self.Workspace.ToolDef.ToolsDefTxtDatabase
-- 
2.20.1.windows.1