Index: zorg/buildbot/builders/sanitizers/buildbot_cmake.sh
===================================================================
--- zorg/buildbot/builders/sanitizers/buildbot_cmake.sh
+++ zorg/buildbot/builders/sanitizers/buildbot_cmake.sh
@@ -49,6 +49,34 @@
 fi
 CHECK_LIBCXX=${CHECK_LIBCXX:-1}
 CHECK_LLD=${CHECK_LLD:-1}
+CHECK_MSAN=0
+CHECK_TSAN=0
+CHECK_LSAN=0
+CHECK_DFSAN=0
+CHECK_SCUDO=0
+if [ "$ARCH" == "x86_64" ]; then
+  CHECK_MSAN=1
+  CHECK_TSAN=1
+  CHECK_LSAN=1
+  CHECK_DFSAN=1
+  CHECK_SCUDO=1
+fi
+if [ "$ARCH" == "aarch64" ]; then
+  CHECK_MSAN=1
+  CHECK_TSAN=1
+  CHECK_LSAN=1
+  CHECK_DFSAN=1
+fi
+if [ "$ARCH" == "mips64" -o "$ARCH" == "mips64el" ]; then
+  CHECK_MSAN=1
+  CHECK_TSAN=1
+  CHECK_LSAN=1
+  CHECK_DFSAN=1
+fi
+if [ "$ARCH" == "ppc64" -o "$ARCH" == "ppc64le" ]; then
+  CHECK_MSAN=1
+  CHECK_TSAN=1
+fi
 
 
 echo @@@BUILD_STEP update@@@
@@ -84,15 +112,23 @@
   (cd clang_build && make -j$MAKE_JOBS check-asan) || echo @@@STEP_FAILURE@@@
   echo @@@BUILD_STEP check-ubsan in gcc build@@@
   (cd clang_build && make -j$MAKE_JOBS check-ubsan) || echo @@@STEP_FAILURE@@@
-  if [ "$ARCH" == "x86_64" ]; then
+  if [ "$CHECK_LSAN" == "1" ]; then
     echo @@@BUILD_STEP check-lsan in gcc build@@@
     (cd clang_build && make -j$MAKE_JOBS check-lsan) || echo @@@STEP_FAILURE@@@
+  fi
+  if [ "$CHECK_MSAN" == "1" ]; then
     echo @@@BUILD_STEP check-msan in gcc build@@@
     (cd clang_build && make -j$MAKE_JOBS check-msan) || echo @@@STEP_FAILURE@@@
+  fi
+  if [ "$CHECK_TSAN" == "1" ]; then
     echo @@@BUILD_STEP check-tsan in gcc build@@@
     (cd clang_build && make -j$MAKE_JOBS check-tsan) || echo @@@STEP_FAILURE@@@
+  fi
+  if [ "$CHECK_SCUDO" == "1" ]; then
     echo @@@BUILD_STEP check-dfsan in gcc build@@@
     (cd clang_build && make -j$MAKE_JOBS check-dfsan) || echo @@@STEP_WARNINGS@@@
+  fi
+  if [ "$ARCH" == "x86_64" ]; then
     # FIXME: Reenable once cfi tests reliably work on the bot.
     # echo @@@BUILD_STEP check-cfi-and-supported in gcc build@@@
     #(cd clang_build && LIBRARY_PATH=/usr/lib/x86_64-linux-gnu/x86_64 make -j$MAKE_JOBS check-cfi-and-supported) || echo @@@STEP_FAILURE@@@
@@ -134,17 +170,17 @@
   (cd llvm_build64 && make -j$MAKE_JOBS check-asan-dynamic) || echo @@@STEP_FAILURE@@@
 fi
 
-if [ "$PLATFORM" == "Linux" -a "$ARCH" == "x86_64" ]; then
+if [ "$PLATFORM" == "Linux" -a "$CHECK_MSAN" == "1" ]; then
   echo @@@BUILD_STEP run msan unit tests@@@
   (cd llvm_build64 && make -j$MAKE_JOBS check-msan) || echo @@@STEP_FAILURE@@@
 fi
 
-if [ "$PLATFORM" == "Linux" -a "$ARCH" == "x86_64" ]; then
+if [ "$PLATFORM" == "Linux" -a "$CHECK_TSAN" == "1" ]; then
   echo @@@BUILD_STEP run 64-bit tsan unit tests@@@
   (cd llvm_build64 && make -j$MAKE_JOBS check-tsan) || echo @@@STEP_FAILURE@@@
 fi
 
-if [ "$PLATFORM" == "Linux" -a "$ARCH" == "x86_64" ]; then
+if [ "$PLATFORM" == "Linux" -a "$CHECK_LSAN" == "1" ]; then
   echo @@@BUILD_STEP run 64-bit lsan unit tests@@@
   (cd llvm_build64 && make -j$MAKE_JOBS check-lsan) || echo @@@STEP_FAILURE@@@
 fi
@@ -175,10 +211,6 @@
 (cd compiler_rt_build && make -j$MAKE_JOBS check-all) || echo @@@STEP_FAILURE@@@
 
 HAVE_NINJA=${HAVE_NINJA:-1}
-SKIP_MSAN=${SKIP_MSAN:-1}
-SKIP_LSAN=${SKIP_LSAN:-1}
-SKIP_DFSAN=${SKIP_DFSAN:-1}
-SKIP_SCUDO=${SKIP_SCUDO:-1}
 if [ "$PLATFORM" == "Linux" -a $HAVE_NINJA == 1 ]; then
   echo @@@BUILD_STEP build with ninja@@@
   if [ ! -d llvm_build_ninja ]; then
@@ -193,23 +225,25 @@
   (cd llvm_build_ninja && ninja check-asan) || echo @@@STEP_FAILURE@@@
   echo @@@BUILD_STEP ninja check-sanitizer@@@
   (cd llvm_build_ninja && ninja check-sanitizer) || echo @@@STEP_FAILURE@@@
-  echo @@@BUILD_STEP ninja check-tsan@@@
-  (cd llvm_build_ninja && ninja check-tsan) || echo @@@STEP_FAILURE@@@
   echo @@@BUILD_STEP ninja check-ubsan@@@
   (cd llvm_build_ninja && ninja check-ubsan) || echo @@@STEP_FAILURE@@@
-  if [ "$SKIP_SCUDO" != 1 ]; then
+  if [ "$CHECK_TSAN" == 1 ]; then
+    echo @@@BUILD_STEP ninja check-tsan@@@
+    (cd llvm_build_ninja && ninja check-tsan) || echo @@@STEP_FAILURE@@@
+  fi
+  if [ "$CHECK_SCUDO" == 1 ]; then
     echo @@@BUILD_STEP ninja check-scudo@@@
     (cd llvm_build_ninja && ninja check-scudo) || echo @@@STEP_FAILURE@@@
   fi
-  if [ "$SKIP_MSAN" != 1 ]; then
+  if [ "$CHECK_MSAN" == 1 ]; then
     echo @@@BUILD_STEP ninja check-msan@@@
     (cd llvm_build_ninja && ninja check-msan) || echo @@@STEP_FAILURE@@@
   fi
-  if [ "$SKIP_LSAN" != 1 ]; then
+  if [ "$CHECK_LSAN" == 1 ]; then
     echo @@@BUILD_STEP ninja check-lsan@@@
     (cd llvm_build_ninja && ninja check-lsan) || echo @@@STEP_FAILURE@@@
   fi
-  if [ "$SKIP_DFSAN" != 1 ]; then
+  if [ "$CHECK_DFSAN" == 1 ]; then
     echo @@@BUILD_STEP ninja check-dfsan@@@
     (cd llvm_build_ninja && ninja check-dfsan) || echo @@@STEP_WARNINGS@@@
   fi
Index: zorg/buildbot/builders/sanitizers/buildbot_selector.py
===================================================================
--- zorg/buildbot/builders/sanitizers/buildbot_selector.py
+++ zorg/buildbot/builders/sanitizers/buildbot_selector.py
@@ -24,8 +24,8 @@
 }
 
 BOT_ADDITIONAL_ENV = {
-    'sanitizer-ppc64le-linux': { 'HAVE_NINJA': '1', 'CHECK_LIBCXX': '0', 'CHECK_LLD': '0', 'SKIP_LSAN': '1', 'SKIP_DFSAN': '1', 'SKIP_SCUDO': '1' },
-    'sanitizer-ppc64be-linux': { 'HAVE_NINJA': '1', 'CHECK_LIBCXX': '0', 'CHECK_LLD': '0', 'SKIP_SCUDO': '1' },
+    'sanitizer-ppc64le-linux': { 'HAVE_NINJA': '1', 'CHECK_LIBCXX': '0', 'CHECK_LLD': '0' },
+    'sanitizer-ppc64be-linux': { 'HAVE_NINJA': '1', 'CHECK_LIBCXX': '0', 'CHECK_LLD': '0' },
     'sanitizer-x86_64-linux': { 'HAVE_NINJA' : '1', 'BUILD_ANDROID' : '1', 'RUN_ANDROID' : '1' },
     'sanitizer-x86_64-linux-bootstrap': {},
     'sanitizer-x86_64-linux-fast': {},