scons: Remove -Werror for the gem5 21.0 release

While gem5 compiles on all our supported compilers, removing the -Werror
flag on the stable branch ensures that, as new compilers are released
with stricter warnings, gem5 remains compilable.

Change-Id: Ic7bb17e770684211330c09143bd8a26720becb9a
Reviewed-by: Bobby R. Bruce <>
Maintainer: Bobby R. Bruce <>
Tested-by: kokoro <>
diff --git a/SConstruct b/SConstruct
index fb3421c..bcfd58f 100755
--- a/SConstruct
+++ b/SConstruct
@@ -322,12 +322,6 @@
     if GetOption('gold_linker'):
-    # Treat warnings as errors but white list some warnings that we
-    # want to allow (e.g., deprecation warnings).
-    main.Append(CCFLAGS=['-Werror',
-                         '-Wno-error=deprecated-declarations',
-                         '-Wno-error=deprecated',
-                        ])
           "Don't know what compiler options to use for your compiler.",