diff --git a/.gitignore b/.gitignore
index d69a40af8cd..94c0009aa29 100644
--- a/.gitignore
+++ b/.gitignore
@@ -164,6 +164,12 @@ GSYMS
 GRTAGS
 GTAGS
 
+# auto-generated compilation database
+compile_commands.json
+
+# ccls, a LSP-compliant server for C
+/.ccls-cache
+
 # GNU idutils.
 ID