From 691cb1577300d5df5118cd2b77c02b99a833d174 Mon Sep 17 00:00:00 2001
From: Andrew Morrow <acm@mongodb.com>
Date: Sun, 21 Feb 2021 13:05:25 -0500
Subject: SERVER-19338 Add an experiment for allowing type-based alias analysis

---
 SConstruct | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

(limited to 'SConstruct')

diff --git a/SConstruct b/SConstruct
index 5af70c55217..e1b5310a05b 100644
--- a/SConstruct
+++ b/SConstruct
@@ -277,6 +277,7 @@ experimental_optimizations = [
     'builtin-memcmp',
     'fnsi',
     'sandybridge',
+    'tbaa',
     'treevec',
 ]
 experimental_optimization_choices = ['*']
@@ -2429,13 +2430,16 @@ if env.TargetOSIs('posix'):
 
     # -Winvalid-pch Warn if a precompiled header (see Precompiled Headers) is found in the search path but can't be used.
     env.Append( CCFLAGS=["-fno-omit-frame-pointer",
-                         "-fno-strict-aliasing",
                          "-fasynchronous-unwind-tables",
                          "-ggdb" if not env.TargetOSIs('emscripten') else "-g",
                          "-Wall",
                          "-Wsign-compare",
                          "-Wno-unknown-pragmas",
                          "-Winvalid-pch"] )
+
+    if not "tbaa" in selected_experimental_optimizations:
+        env.Append(CCFLAGS=["-fno-strict-aliasing"])
+
     # env.Append( " -Wconversion" ) TODO: this doesn't really work yet
     if env.TargetOSIs('linux', 'darwin', 'solaris'):
         if not has_option("disable-warnings-as-errors"):
-- 
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