BaseTools: GenC: Fixing an edge case where BUILDMODULE might fail

This change fixed an edge case when invoking the build process with
"BUILDMODULE" and no stack cookie is involved (i.e. pure assembly code),
the build might fail.

The existing code path is written to handle such case, but the error
method is actually breaking the build. This change demotes the message
to warning.

This was tested on QEMU Q35 build process.

Signed-off-by: Kun Qin <[email protected]>

(cherry picked from commit ca0ae3c)

BaseTools/Source/Python/AutoGen/GenC.py

@@ -2076,7 +2076,7 @@ def CreateCode(Info, AutoGenC, AutoGenH, StringH, UniGenCFlag, UniGenBinBuffer,
             else:
                 CookieValue = int(GlobalData.gStackCookieValues64[hash(Info.Guid) % len(GlobalData.gStackCookieValues64)])
         except:
-            EdkLogger.error("build", AUTOGEN_ERROR, "Failed to get Stack Cookie Value List! Generating random value.", ExtraData="[%s]" % str(Info))
+            EdkLogger.warn("build", "Failed to get Stack Cookie Value List! Generating random value.", ExtraData="[%s]" % str(Info))
             if Bitwidth == 32:
                 CookieValue = secrets.randbelow (0xFFFFFFFF)
             else: