--- SConstruct.orig	2023-06-07 17:07:38 UTC
+++ SConstruct
@@ -23,7 +23,6 @@ import SCons.Script
 
 import SCons
 import SCons.Script
-from mongo_tooling_metrics.lib.top_level_metrics import SConsToolingMetrics
 from site_scons.mongo import build_profiles
 
 # This must be first, even before EnsureSConsVersion, if
@@ -1655,16 +1654,6 @@ env.AddMethod(lambda env, name, **kwargs: add_option(n
 del envDict
 env.AddMethod(lambda env, name, **kwargs: add_option(name, **kwargs), 'AddOption')
 
-# The placement of this is intentional. Here we setup an atexit method to store tooling metrics.
-# We should only register this function after env, env_vars and the parser have been properly initialized.
-SConsToolingMetrics.register_metrics(
-    utc_starttime=datetime.utcnow(),
-    artifact_dir=env.Dir('$BUILD_DIR').get_abspath(),
-    env_vars=env_vars,
-    env=env,
-    parser=_parser,
-)
-
 if get_option('build-metrics'):
     env['BUILD_METRICS_ARTIFACTS_DIR'] = '$BUILD_ROOT/$VARIANT_DIR'
     env.Tool('build_metrics')
@@ -1801,9 +1790,9 @@ if has_option('variables-help'):
     print(env_vars.GenerateHelpText(env))
     Exit(0)
 
-unknown_vars = env_vars.UnknownVariables()
-if unknown_vars:
-    env.FatalError("Unknown variables specified: {0}", ", ".join(list(unknown_vars.keys())))
+#unknown_vars = env_vars.UnknownVariables()
+#if unknown_vars:
+#    env.FatalError("Unknown variables specified: {0}", ", ".join(list(unknown_vars.keys())))
 
 install_actions.setup(env, get_option('install-action'))
 
@@ -3026,7 +3015,7 @@ if env.TargetOSIs('posix'):
             # If runtime hardening is requested, then build anything
             # destined for an executable with the necessary flags for PIE.
             env.AppendUnique(
-                PROGCCFLAGS=['-fPIE'],
+                PROGCCFLAGS=['-fpic'],
                 PROGLINKFLAGS=['-pie'],
             )
 
@@ -3034,7 +3023,6 @@ if env.TargetOSIs('posix'):
     env.Append(
         CCFLAGS=[
             "-fasynchronous-unwind-tables",
-            "-g2" if not env.TargetOSIs('emscripten') else "-g",
             "-Wall",
             "-Wsign-compare",
             "-Wno-unknown-pragmas",
@@ -3217,8 +3205,12 @@ if not env.TargetOSIs('windows', 'macOS') and (env.Too
     # setting it for both C and C++ by setting both of CFLAGS and
     # CXXFLAGS.
 
+    arm_march_flag = "armv8-a"
+    if get_option('use-hardware-crc32') == "on":
+        arm_march_flag += "+crc"
+
     default_targeting_flags_for_architecture = {
-        "aarch64": {"-march=": "armv8.2-a", "-mtune=": "generic"},
+        "aarch64": {"-march=": arm_march_flag, "-mtune=": "generic"},
         "i386": {"-march=": "nocona", "-mtune=": "generic"},
         "ppc64le": {"-mcpu=": "power8", "-mtune=": "power8", "-mcmodel=": "medium"},
         "s390x": {"-march=": "z196", "-mtune=": "zEC12"},