scons: Remove -Werror for the gem5 v21.2 release

While gem5 compiles on 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: I05989356997bc7f6606c43944d15da6c3958a3f5
Reviewed-by: Bobby Bruce <>
Maintainer: Bobby Bruce <>
Tested-by: kokoro <>
diff --git a/SConstruct b/SConstruct
index 8fa5517..ceeb1ba 100755
--- a/SConstruct
+++ b/SConstruct
@@ -348,12 +348,6 @@
     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.",