diff --git a/llvm/utils/gn/build/toolchain/BUILD.gn b/llvm/utils/gn/build/toolchain/BUILD.gn
--- a/llvm/utils/gn/build/toolchain/BUILD.gn
+++ b/llvm/utils/gn/build/toolchain/BUILD.gn
@@ -4,11 +4,16 @@
   # If is_goma is true, the location of the goma client install.
   # Set this to the output of `goma_ctl goma_dir`.
   goma_dir = ""
+
+  # If set, prepends this to compile action command lines (e.g. `"ccache"`).
+  compiler_wrapper = ""
 }
 
 assert(!use_goma || goma_dir != "",
        "set `goma_dir` to the output of `goma_ctl goma_dir` in your args.gn")
 
+assert(!(use_goma && compiler_wrapper != ""), "cannot use both goma and a compiler launcher")
+
 unix_copy_command = "ln -f {{source}} {{output}} 2>/dev/null || (rm -rf {{output}} && cp -af {{source}} {{output}})"
 
 template("unix_toolchain") {
@@ -31,6 +36,9 @@
     if (use_goma) {
       cc = "$goma_dir/gomacc $cc"
       cxx = "$goma_dir/gomacc $cxx"
+    } else if (compiler_wrapper != "") {
+      cc = "$compiler_wrapper $cc"
+      cxx = "$compiler_wrapper $cxx"
     }
 
     tool("cc") {