new file mode 100644
--- /dev/null
+++ b/browser/config/mozconfigs/macosx64/opt-static-analysis
@@ -0,0 +1,19 @@
+MOZ_AUTOMATION_BUILD_SYMBOLS=0
+MOZ_AUTOMATION_PACKAGE_TESTS=0
+MOZ_AUTOMATION_L10N_CHECK=0
+
+. $topsrcdir/build/macosx/mozconfig.common
+
+ac_add_options --disable-debug
+ac_add_options --enable-optimize
+ac_add_options --enable-dmd
+
+# Treat warnings as errors (modulo ALLOW_COMPILER_WARNINGS).
+ac_add_options --enable-warnings-as-errors
+
+ac_add_options --enable-clang-plugin
+
+. "$topsrcdir/build/macosx/mozconfig.rust"
+. "$topsrcdir/build/mozconfig.common.override"
+. "$topsrcdir/build/mozconfig.cache"
+

new file mode 100644
--- /dev/null
+++ b/testing/mozharness/configs/builds/releng_sub_mac_configs/64_cross_opt.py
@@ -0,0 +1,40 @@
+import os
+
+MOZ_OBJDIR = 'obj-firefox'
+
+config = {
+    'default_actions': [
+        'clobber',
+        'clone-tools',
+        'checkout-sources',
+        # 'setup-mock',
+        'build',
+    ],
+    'stage_platform': 'macosx64-st-an',
+    'debug_build': False,
+    'objdir': 'obj-firefox',
+    'enable_talos_sendchange': False,
+    #### 64 bit build specific #####
+    'env': {
+        'MOZBUILD_STATE_PATH': os.path.join(os.getcwd(), '.mozbuild'),
+        'MOZ_AUTOMATION': '1',
+        'HG_SHARE_BASE_DIR': '/builds/hg-shared',
+        'MOZ_OBJDIR': 'obj-firefox',
+        'TINDERBOX_OUTPUT': '1',
+        'TOOLTOOL_CACHE': '/builds/tooltool_cache',
+        'TOOLTOOL_HOME': '/builds',
+        'MOZ_CRASHREPORTER_NO_REPORT': '1',
+        'CCACHE_DIR': '/builds/ccache',
+        'CCACHE_COMPRESS': '1',
+        'CCACHE_UMASK': '002',
+        'LC_ALL': 'C',
+        'XPCOM_DEBUG_BREAK': 'stack-and-abort',
+        ## 64 bit specific
+        'PATH': '/tools/python/bin:/tools/buildbot/bin:/opt/local/bin:/usr/bin:'
+                '/bin:/usr/sbin:/sbin:/usr/local/bin:/usr/X11/bin',
+        ##
+    },
+    'src_mozconfig': 'browser/config/mozconfigs/macosx64/opt-static-analysis',
+    'purge_minsize': 10,
+    #######################
+}

--- a/testing/mozharness/mozharness/mozilla/building/buildbase.py
+++ b/testing/mozharness/mozharness/mozilla/building/buildbase.py
@@ -305,16 +305,17 @@ class BuildOptionParser(object):
     # against the current platform and bits.
     # *It will warn and fail if there is not a config for the current
     # platform/bits
     build_variants = {
         'asan': 'builds/releng_sub_%s_configs/%s_asan.py',
         'tsan': 'builds/releng_sub_%s_configs/%s_tsan.py',
         'b2g-debug': 'b2g/releng_sub_%s_configs/%s_debug.py',
         'cross-debug': 'builds/releng_sub_%s_configs/%s_cross_debug.py',
+        'cross-opt': 'builds/releng_sub_%s_configs/%s_cross_opt.py',
         'debug': 'builds/releng_sub_%s_configs/%s_debug.py',
         'asan-and-debug': 'builds/releng_sub_%s_configs/%s_asan_and_debug.py',
         'stat-and-debug': 'builds/releng_sub_%s_configs/%s_stat_and_debug.py',
         'mulet': 'builds/releng_sub_%s_configs/%s_mulet.py',
         'code-coverage': 'builds/releng_sub_%s_configs/%s_code_coverage.py',
         'graphene': 'builds/releng_sub_%s_configs/%s_graphene.py',
         'horizon': 'builds/releng_sub_%s_configs/%s_horizon.py',
         'source': 'builds/releng_sub_%s_configs/%s_source.py',

--- a/testing/taskcluster/tasks/branches/base_job_flags.yml
+++ b/testing/taskcluster/tasks/branches/base_job_flags.yml
@@ -36,16 +36,17 @@ flags:
     - aries-dogfood
     - android-api-11
     - android-partner-sample1
     - android-b2gdroid
     - linux
     - linux64
     - linux64-st-an
     - macosx64
+    - macosx64-st-an
 
   tests:
     - cppunit
     - crashtest
     - crashtest-ipc
     - gaia-build
     - gaia-build-unit
     - gaia-js-integration

--- a/testing/taskcluster/tasks/branches/base_jobs.yml
+++ b/testing/taskcluster/tasks/branches/base_jobs.yml
@@ -153,16 +153,22 @@ builds:
       opt:
         task: tasks/builds/opt_linux64_st-an.yml
   macosx64:
     platforms:
       - MacOSX64
     types:
       debug:
         task: tasks/builds/dbg_macosx64.yml
+  macosx64-st-an:
+    platforms:
+      - MacOSX64 Static Analysis
+    types:
+      opt:
+        task: tasks/builds/opt_macosx64_st-an.yml
   android-b2gdroid:
     platforms:
       - Android
     types:
       opt:
         task: tasks/builds/android_api_11_b2gdroid.yml
 
 tests:

--- a/testing/taskcluster/tasks/branches/try/job_flags.yml
+++ b/testing/taskcluster/tasks/branches/try/job_flags.yml
@@ -210,16 +210,22 @@ builds:
       opt:
         task: tasks/builds/opt_linux64_st-an_clobber.yml
   macosx64:
     platforms:
       - MacOSX64
     types:
       debug:
         task: tasks/builds/dbg_macosx64_clobber.yml
+  macosx64-st-an:
+    platforms:
+      - MacOSX64 Static Analysis
+    types:
+      opt:
+        task: tasks/builds/opt_macosx64_st-an_clobber.yml
 
 post-build:
   upload-symbols:
     allowed_build_tasks:
       - tasks/builds/opt_linux64.yml
       - tasks/builds/opt_linux64_st-an.yml
       - tasks/builds/dbg_linux64.yml
       - tasks/builds/android_api_11.yml

new file mode 100644
--- /dev/null
+++ b/testing/taskcluster/tasks/builds/opt_macosx64_st-an.yml
@@ -0,0 +1,28 @@
+$inherits:
+  from: 'tasks/builds/opt_macosx64_clobber.yml'
+  variables:
+    build_name: 'macosx64-st-an'
+task:
+  metadata:
+      name: '[TC] MacOSX64 Static Analysis Opt'
+      description: 'MacOSX64 Static Analysis Opt'
+
+  scopes:
+    - 'docker-worker:cache:build-macosx64-st-an-workspace'
+
+  routes:
+    - 'index.buildbot.branches.{{project}}.macosx64-st-an'
+    - 'index.buildbot.revisions.{{head_rev}}.{{project}}.macosx64-st-an'
+
+  payload:
+    cache:
+      build-macosx64-st-an-workspace: '/home/worker/workspace'
+    env:
+      MH_CUSTOM_BUILD_VARIANT_CFG: 'cross-opt'
+      DIST_UPLOADS: ''
+      DIST_TARGET_UPLOADS: ''
+  extra:
+    treeherder:
+      groupSymbol: "?"
+      groupName: Submitted by taskcluster
+      symbol: S

new file mode 100644
--- /dev/null
+++ b/testing/taskcluster/tasks/builds/opt_macosx64_st-an_clobber.yml
@@ -0,0 +1,23 @@
+$inherits:
+  from: 'tasks/builds/opt_macosx64_clobber.yml'
+  variables:
+    build_name: 'macosx64-st-an'
+task:
+  metadata:
+      name: '[TC] MacOSX64 Static Analysis Opt'
+      description: 'MacOSX64 Static Analysis Opt'
+
+  routes:
+    - 'index.buildbot.branches.{{project}}.macosx64-st-an'
+    - 'index.buildbot.revisions.{{head_rev}}.{{project}}.macosx64-st-an'
+
+  payload:
+    env:
+      MH_CUSTOM_BUILD_VARIANT_CFG: 'cross-opt'
+      DIST_UPLOADS: ''
+      DIST_TARGET_UPLOADS: ''
+  extra:
+    treeherder:
+      groupSymbol: "?"
+      groupName: Submitted by taskcluster
+      symbol: S