commit 1d34e5f730349a76094a4bd778e5783dfa2127e6
author Alexei Frolov <frolv@google.com> Mon Jun 15 14:25:07 2020 -0700
committer Alexei Frolov <frolv@google.com> Mon Jun 15 14:32:31 2020 -0700
tree 0926109d471d06372aaea46b0a2147cf75b2c44f
parent 0f79296272eeb6b7a86ae73e6b763cfcf1dcb7d5

host: Don't add nanopb generator if it exists

This checks if the project has already set the nanopb protobuf generator
before adding it as part of the host target.

Change-Id: Ie3642e98bf3d7d2d50bbd15eafa0d858e8487419

targets/host/target_toolchains.gni

diff --git a/targets/host/target_toolchains.gni b/targets/host/target_toolchains.gni
index aeee7a2..20c10a3 100644
--- a/targets/host/target_toolchains.gni
+++ b/targets/host/target_toolchains.gni
@@ -33,7 +33,9 @@
   pw_sys_io_BACKEND = "$dir_pw_sys_io_stdio"
 
   # Allow nanopb to be toggled via a build arg on host for easy testing.
-  if (dir_pw_third_party_nanopb != "") {
+  _has_nanopb = pw_protobuf_GENERATORS + [ "nanopb" ] - [ "nanopb" ] !=
+                pw_protobuf_GENERATORS
+  if (dir_pw_third_party_nanopb != "" && !_has_nanopb) {
     pw_protobuf_GENERATORS += [ "nanopb" ]
   }