diff --git a/utils/build-script-impl b/utils/build-script-impl
index 9a45827895ae0..9af666b517210 100755
--- a/utils/build-script-impl
+++ b/utils/build-script-impl
@@ -3230,20 +3230,21 @@ for host in "${ALL_HOSTS[@]}"; do
             printJSONStartTimestamp dsymutil
             (cd "${host_symroot}" &&
              find ./"${CURRENT_PREFIX}" -perm -0111 -type f -not -name "*.a" -not -name "*.py" -print | \
-               xargs -n 1 -P ${DSYMUTIL_JOBS} ${dsymutil_path})
+               xargs -t -n 1 -P ${DSYMUTIL_JOBS} ${dsymutil_path})
             printJSONEndTimestamp dsymutil
 
             # Strip executables, shared libraries and static libraries in
-            # `host_install_destdir`.
+            # `host_install_destdir`. Avoid touching clang builtins .a files.
             find "${CURRENT_INSTALL_DIR}${CURRENT_PREFIX}/" \
               '(' -perm -0111 -or -name "*.a" ')' -type f -print | \
-              xargs -n 1 -P ${BUILD_JOBS} $(xcrun_find_tool strip) -S
+              grep_that_allows_no_matches -v "/clang/lib/darwin/" | \
+              xargs -t -n 1 -P ${BUILD_JOBS} $(xcrun_find_tool strip) -S
 
             # Codesign dylibs and executables in usr/bin after strip tool
             # rdar://45388785
             find "${CURRENT_INSTALL_DIR}${CURRENT_PREFIX}/" \
               '(' '(' -path "*/usr/bin/*" -and -perm -0111 ')' -or -name "*.dylib" ')' -type f -print | \
-              xargs -n 1 -P ${BUILD_JOBS} $(xcrun_find_tool codesign) -f -s -
+              xargs -t -n 1 -P ${BUILD_JOBS} $(xcrun_find_tool codesign) -f -s -
         fi
 
         { set +x; } 2>/dev/null
diff --git a/validation-test/BuildSystem/dsymutil_jobs.test b/validation-test/BuildSystem/dsymutil_jobs.test
index c0f4d70875ad9..810ff35d52a85 100644
--- a/validation-test/BuildSystem/dsymutil_jobs.test
+++ b/validation-test/BuildSystem/dsymutil_jobs.test
@@ -8,5 +8,5 @@
 
 # CHECK: --- Extracting symbols ---
 # CHECK: { "command": "dsymutil", "start": "
-# CHECK: xargs -n 1 -P 5 {{.*}}dsymutil
+# CHECK: xargs -t -n 1 -P 5 {{.*}}dsymutil
 # CHECK: { "command": "dsymutil", "end": "