buildroot/package/grpc/0001-target-build-using-host-plugin.patch

From aa18148e392ef28275a182db34397ccb66fb4617 Mon Sep 17 00:00:00 2001
From: Robert Rose <robertroyrose@gmail.com>
Date: Wed, 28 Nov 2018 09:41:52 -0800
Subject: [PATCH] CMakeLists.txt: allow passing a pre-existing grpc_cpp_plugin

The grpc_cpp_plugin is meant to be executed during the build process
of grpc. As such, in cross-compilation contexts, this program needs to
be built for the host machine and not the target machine. In order to
allow this, this commit adds an option gRPC_NATIVE_CPP_PLUGIN that can
be passed on the command line, with the path to an existing
grpc_cpp_plugin binary. If not passed, grpc_cpp_plugin is built as
usual.

Signed-off-by: Robert Rose <robertroyrose@gmail.com>
---
 CMakeLists.txt | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index fc76cf5..7a22b08 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -13108,6 +13108,18 @@ target_link_libraries(grpc_cli
 endif (gRPC_BUILD_TESTS)
 if (gRPC_BUILD_CODEGEN)
 
+if (gRPC_NATIVE_CPP_PLUGIN)
+
+add_executable(grpc_cpp_plugin
+  IMPORTED
+)
+
+set_property(TARGET grpc_cpp_plugin
+  PROPERTY IMPORTED_LOCATION ${gRPC_NATIVE_CPP_PLUGIN}
+)
+
+else()
+
 add_executable(grpc_cpp_plugin
   src/compiler/cpp_plugin.cc
 )
@@ -13143,6 +13155,7 @@ if (gRPC_INSTALL)
     ARCHIVE DESTINATION ${gRPC_INSTALL_LIBDIR}
   )
 endif()
+endif()
 
 endif (gRPC_BUILD_CODEGEN)
 if (gRPC_BUILD_CODEGEN)
-- 
2.20.0.rc0.387.gc7a69e6b6c-goog