diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index eef23778..2fd5a04e 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -196,6 +196,15 @@ debian meson:
   variables:
     ci_buildsys: "meson-dist"
 
+debian meson clang debug:
+  extends:
+    - .meson-common
+    - .debian-build
+  variables:
+    ci_buildsys: "meson-dist"
+    ci_compiler: "clang"
+    ci_variant: "debug"
+
 debian mingw32 autotools debug:
   extends: .debian-build
   variables:
diff --git a/tools/ci-build.sh b/tools/ci-build.sh
index 0e72b2d9..287b170e 100755
--- a/tools/ci-build.sh
+++ b/tools/ci-build.sh
@@ -77,6 +77,10 @@ init_wine() {
 # Build system under test: autotools or cmake
 : "${ci_buildsys:=autotools}"
 
+# ci_compiler:
+# Compiler used to build dbus: gcc or clang
+: "${ci_compiler:=gcc}"
+
 # ci_distro:
 # OS distribution in which we are testing
 # Typical values: auto (detect at runtime), ubuntu, debian; maybe fedora in future
@@ -265,6 +269,8 @@ esac
 export MAKE=${make}
 make="${make} -j${ci_parallel} V=1 VERBOSE=1"
 
+export UBSAN_OPTIONS=print_stacktrace=1:print_summary=1:halt_on_error=1
+
 case "$ci_buildsys" in
     (autotools)
         case "$ci_variant" in
@@ -522,6 +528,12 @@ case "$ci_buildsys" in
                         ;;
                     (*)
                         set -- -Db_sanitize=address,undefined "$@"
+
+                        # https://github.com/mesonbuild/meson/issues/764
+                        if [ "$ci_compiler" = "clang" ]; then
+                            set -- -Db_lundef=false "$@"
+                        fi
+
                         set -- -Db_pie=true "$@"
                         set -- -Duser_session=true "$@"
                         ;;
@@ -531,6 +543,14 @@ case "$ci_buildsys" in
                 ;;
         esac
 
+        case "$ci_compiler" in
+            (clang)
+                export CC=clang
+                ;;
+            (*)
+                ;;
+        esac
+
         # Debian doesn't have similar convenience wrappers, but we can use
         # a cross-file
         if [ -z "$meson_setup" ] || ! command -v "$meson_setup" >/dev/null; then
@@ -548,7 +568,7 @@ case "$ci_buildsys" in
 
         $meson_setup "$@" "$srcdir"
         meson compile -v
-        [ "$ci_test" = no ] || meson test
+        [ "$ci_test" = no ] || meson test --print-errorlogs
         DESTDIR=DESTDIR meson install
         ( cd DESTDIR && find . -ls)
         ;;
diff --git a/tools/ci-install.sh b/tools/ci-install.sh
index c53ede9b..b259a58e 100755
--- a/tools/ci-install.sh
+++ b/tools/ci-install.sh
@@ -148,6 +148,7 @@ case "$ci_distro" in
             autotools-dev
             ca-certificates
             ccache
+            clang
             cmake
             debhelper
             dh-autoreconf
@@ -169,6 +170,7 @@ case "$ci_distro" in
             libselinux1-dev
             libsystemd-dev
             libx11-dev
+            llvm
             meson
             ninja-build
             sudo