buildroot/package/grpc/0004-host-grpc-only-cpp-plugin.patch

From a1922eadfc87da3dd221ff631f94ddd4a8ee7049 Mon Sep 17 00:00:00 2001
From: Thomas De Schampheleire <thomas.de_schampheleire@nokia.com>
Date: Tue, 25 May 2021 14:55:23 +0200
Subject: [PATCH] Add option to restrict building of (host-)grpc to
 grpc_cpp_plugin only.

This avoids unnecessary dependencies on big packages like libabseil-cpp and
others.

Upstream-status: not accepted (see https://github.com/grpc/grpc/issues/25322)

Signed-off-by: Thomas De Schampheleire <thomas.de_schampheleire@nokia.com>
---
 CMakeLists.txt | 43 +++++++++++++++++++++++++++++++++++--------
 1 file changed, 35 insertions(+), 8 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index e8934a3e03..c2df332cc6 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -48,12 +48,16 @@ option(gRPC_BUILD_TESTS "Build tests" OFF)
 option(gRPC_BUILD_CODEGEN "Build codegen" ON)
 option(gRPC_BUILD_CSHARP_EXT "Build C# extensions" ON)
 option(gRPC_BACKWARDS_COMPATIBILITY_MODE "Build libraries that are binary compatible across a larger number of OS and libc versions" OFF)
+option(gRPC_BUILD_PLUGIN_SUPPORT_ONLY "Build plugin support only" OFF)
 
 set(gRPC_INSTALL_default ON)
 if(NOT CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
   # Disable gRPC_INSTALL by default if building as a submodule
   set(gRPC_INSTALL_default OFF)
 endif()
+if(gRPC_BUILD_PLUGIN_SUPPORT_ONLY)
+  set(gRPC_INSTALL_default OFF)
+endif()
 set(gRPC_INSTALL ${gRPC_INSTALL_default} CACHE BOOL
     "Generate installation target")
 
@@ -367,6 +371,8 @@ add_custom_target(plugins
   DEPENDS ${_gRPC_PLUGIN_LIST}
 )
 
+if (NOT gRPC_BUILD_PLUGIN_SUPPORT_ONLY)
+
 add_custom_target(tools_c
   DEPENDS
   check_epollexclusive
@@ -382,6 +388,8 @@ add_custom_target(tools_cxx
 add_custom_target(tools
   DEPENDS tools_c tools_cxx)
 
+endif() # gRPC_BUILD_PLUGIN_SUPPORT_ONLY
+
 protobuf_generate_grpc_cpp(
   src/proto/grpc/channelz/channelz.proto
 )
@@ -1000,6 +1008,7 @@ if(gRPC_BUILD_TESTS)
     DEPENDS buildtests_c buildtests_cxx)
 endif()
 
+if (NOT gRPC_BUILD_PLUGIN_SUPPORT_ONLY)
 
 add_library(address_sorting
   third_party/address_sorting/address_sorting.c
@@ -1051,6 +1060,8 @@ if(gRPC_INSTALL)
   )
 endif()
 
+endif() # gRPC_BUILD_PLUGIN_SUPPORT_ONLY
+
 if(gRPC_BUILD_TESTS)
 
 add_library(end2end_nosec_tests
@@ -1313,6 +1324,8 @@ target_link_libraries(end2end_tests
 
 endif()
 
+if(NOT gRPC_BUILD_PLUGIN_SUPPORT_ONLY)
+
 add_library(gpr
   src/core/lib/gpr/alloc.cc
   src/core/lib/gpr/atm.cc
@@ -2106,6 +2119,8 @@ if(gRPC_INSTALL)
   )
 endif()
 
+endif() # gRPC_BUILD_PLUGIN_SUPPORT_ONLY
+
 if(gRPC_BUILD_CSHARP_EXT)
 
 add_library(grpc_csharp_ext SHARED
@@ -2288,6 +2303,8 @@ endif()
 
 endif()
 
+if(NOT gRPC_BUILD_PLUGIN_SUPPORT_ONLY)
+
 add_library(grpc_unsecure
   src/core/ext/filters/census/grpc_context.cc
   src/core/ext/filters/client_channel/backend_metric.cc
@@ -2650,6 +2667,8 @@ if(gRPC_INSTALL)
   )
 endif()
 
+endif() # gRPC_BUILD_PLUGIN_SUPPORT_ONLY
+
 if(gRPC_BUILD_TESTS)
 
 if(gRPC_BUILD_CODEGEN)
@@ -2717,6 +2736,8 @@ endif()
 
 endif()
 
+if(NOT gRPC_BUILD_PLUGIN_SUPPORT_ONLY)
+
 add_library(grpc++
   src/cpp/client/channel_cc.cc
   src/cpp/client/client_callback.cc
@@ -3134,6 +3155,7 @@ if(gRPC_INSTALL)
   )
 endif()
 
+endif() # gRPC_BUILD_PLUGIN_SUPPORT_ONLY
 
 if(gRPC_BUILD_CODEGEN)
 add_library(grpc++_reflection
@@ -3374,6 +3396,8 @@ target_link_libraries(grpc++_test_util
 
 endif()
 
+if(NOT gRPC_BUILD_PLUGIN_SUPPORT_ONLY)
+
 add_library(grpc++_unsecure
   src/cpp/client/channel_cc.cc
   src/cpp/client/client_callback.cc
@@ -3656,6 +3680,7 @@ if(gRPC_INSTALL)
   )
 endif()
 
+endif() # gRPC_BUILD_PLUGIN_SUPPORT_ONLY
 
 add_library(grpc_plugin_support
   src/compiler/cpp_generator.cc
@@ -3715,7 +3740,7 @@ foreach(_hdr
 endforeach()
 
 
-if(gRPC_INSTALL)
+if(gRPC_INSTALL OR gRPC_BUILD_PLUGIN_SUPPORT_ONLY)
   install(TARGETS grpc_plugin_support EXPORT gRPCTargets
     RUNTIME DESTINATION ${gRPC_INSTALL_BINDIR}
     LIBRARY DESTINATION ${gRPC_INSTALL_LIBDIR}
@@ -3795,6 +3820,8 @@ endif()
 
 endif()
 
+if(NOT gRPC_BUILD_PLUGIN_SUPPORT_ONLY)
+
 add_library(upb
   third_party/upb/upb/decode_fast.c
   third_party/upb/upb/decode.c
@@ -3852,8 +3879,6 @@ if(gRPC_INSTALL)
   )
 endif()
 
-
-
 add_executable(check_epollexclusive
   test/build/check_epollexclusive.c
 )
@@ -3906,8 +3931,6 @@ target_link_libraries(gen_hpack_tables
   gpr
 )
 
-
-
 add_executable(gen_legal_metadata_characters
   tools/codegen/core/gen_legal_metadata_characters.cc
 )
@@ -3958,6 +3981,8 @@ target_link_libraries(gen_percent_encoding_tables
   ${_gRPC_ALLTARGETS_LIBRARIES}
 )
 
+endif() # gRPC_BUILD_PLUGIN_SUPPORT_ONLY
+
 
 if(gRPC_BUILD_TESTS)
 
@@ -10722,7 +10747,7 @@ target_link_libraries(grpc_cli
 
 
 endif()
-if(gRPC_BUILD_CODEGEN AND gRPC_BUILD_GRPC_CPP_PLUGIN)
+if(gRPC_BUILD_GRPC_CPP_PLUGIN)
 
 add_executable(grpc_cpp_plugin
   src/compiler/cpp_plugin.cc
@@ -10752,7 +10777,7 @@ target_link_libraries(grpc_cpp_plugin
 
 
 
-if(gRPC_INSTALL)
+if(gRPC_INSTALL OR gRPC_BUILD_PLUGIN_SUPPORT_ONLY)
   install(TARGETS grpc_cpp_plugin EXPORT gRPCTargets
     RUNTIME DESTINATION ${gRPC_INSTALL_BINDIR}
     LIBRARY DESTINATION ${gRPC_INSTALL_LIBDIR}
@@ -15420,7 +15445,7 @@ endif()
 
 
 
-
+if (NOT gRPC_BUILD_PLUGIN_SUPPORT_ONLY)
 
 if(gRPC_INSTALL)
   install(EXPORT gRPCTargets
@@ -15517,3 +15542,5 @@ generate_pkgconfig(
   "-lgrpc++_unsecure -labsl_statusor -labsl_status -labsl_raw_hash_set -labsl_hashtablez_sampler -labsl_synchronization -labsl_time -labsl_time_zone -labsl_civil_time -labsl_graphcycles_internal -labsl_symbolize -labsl_demangle_internal -labsl_malloc_internal -labsl_stacktrace -labsl_debugging_internal -labsl_exponential_biased -labsl_cord -labsl_str_format_internal -labsl_hash -labsl_bad_variant_access -labsl_bad_optional_access -labsl_strings -labsl_strings_internal -labsl_base -labsl_spinlock_wait -labsl_int128 -labsl_city -labsl_throw_delegate -labsl_raw_logging_internal -labsl_log_severity"
   ""
   "grpc++_unsecure.pc")
+
+endif() # gRPC_BUILD_PLUGIN_SUPPORT_ONLY
-- 
2.26.3