package/grpc: restrict host-grpc to the absolute minimum

From: Thomas De Schampheleire <[email protected]>

Currently, grpc depends on the full host-grpc, which in turn depends on host versions of many other libraries. One of these, host-libabseil-cpp, also requires a host gcc 4.9 or larger, a dependency which is not met on CentOS 7.
But in fact, the target grpc only needs the 'grpc_cpp_plugin' binary from host-grpc. And that binary does not depend on host-libabseil-cpp or other libraries, only on host-protobuf.

Given the above, simplify the grpc/host-grpc situation.
- Add a patch to the (host-)grpc CMakeLists.txt file to add an option to only build grpc_cpp_plugin.
- Update grpc.mk and Config.in to remove the unnecessary dependencies, and change the host-grpc configure options to make cmake happy.

The advantages of these changes are:
- making grpc available to older hosts with gcc < 4.8, like CentOS 7
- significantly reducing the build time of host-grpc and its dependencies

The patch was proposed upstream but not accepted with below rationale. Perhaps input from others can help in persuading upstream in a future attempt.

'What you're doing sounds like quite a narrow use case. But we simply cannot provide a cmake option for every possible scenario in the world. Introducing a new cmake option isn't for free and requires careful design and maintenance.'

Nevertheless, given the benefits in terms of build time and dependency reduction, it makes sense to apply this patch in spite of the disadvantage of a local non-upstreamed patch.

Signed-off-by Thomas De Schampheleire <[email protected]>

---

v2: fix typo in Config.in comment (Baruch Siach)

 .../grpc/0004-host-grpc-only-cpp-plugin.patch | 223 ++++++++++++++++++
 package/grpc/Config.in                        |   6 +-
 package/grpc/grpc.mk                          |  27 ++-
 3 files changed, 244 insertions(+), 12 deletions(-)
 create mode 100644 package/grpc/0004-host-grpc-only-cpp-plugin.patch

package/grpc/0004-host-grpc-only-cpp-plugin.patch new file +223 -0

new file mode 100644
index 0000000000..43fad7e3d6
@@ -0,0 +1,223 @@
+From a1922eadfc87da3dd221ff631f94ddd4a8ee7049 Mon Sep 17 00:00:00 2001
+From: Thomas De Schampheleire <[email protected]>
+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 <[email protected]>
+---
+ 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
+

package/grpc/Config.in +2 -4

index d1bf0d078d..ad3ddbcf19 100644
@@ -4,7 +4,6 @@ config BR2_PACKAGE_GRPC
 	depends on BR2_TOOLCHAIN_HAS_THREADS # protobuf, re2
 	depends on BR2_PACKAGE_PROTOBUF_ARCH_SUPPORTS # protobuf
 	depends on BR2_TOOLCHAIN_GCC_AT_LEAST_4_9 # protobuf, re2, libabseil-cpp
-	depends on BR2_HOST_GCC_AT_LEAST_4_9 # host-libabseil-cpp
 	depends on !BR2_STATIC_LIBS # protobuf, libabseil-cpp
 	depends on BR2_TOOLCHAIN_HAS_SYNC_4 || BR2_TOOLCHAIN_HAS_ATOMIC
 	depends on BR2_PACKAGE_LIBABSEIL_CPP_ARCH_SUPPORTS

@@ -20,10 +19,9 @@ config BR2_PACKAGE_GRPC
 
 	  http://github.com/grpc/grpc
 
-comment "grpc needs a toolchain w/ C++, threads, dynamic library, gcc >= 4.9, host gcc >= 4.9"
+comment "grpc needs a toolchain w/ C++, threads, dynamic library, gcc >= 4.9"
 	depends on BR2_PACKAGE_LIBABSEIL_CPP_ARCH_SUPPORTS
 	depends on BR2_TOOLCHAIN_HAS_SYNC_4 || BR2_TOOLCHAIN_HAS_ATOMIC
 	depends on !BR2_INSTALL_LIBSTDCPP || !BR2_TOOLCHAIN_HAS_THREADS \
-		|| BR2_STATIC_LIBS || !BR2_TOOLCHAIN_GCC_AT_LEAST_4_9 \
-		|| !BR2_HOST_GCC_AT_LEAST_4_9
+		|| BR2_STATIC_LIBS || !BR2_TOOLCHAIN_GCC_AT_LEAST_4_9
 	depends on BR2_PACKAGE_PROTOBUF_ARCH_SUPPORTS

package/grpc/grpc.mk +19 -8

index ee8dc38e70..8718b0e956 100644
@@ -14,8 +14,7 @@ GRPC_INSTALL_STAGING = YES
 
 # Need to use host grpc_cpp_plugin during cross compilation.
 GRPC_DEPENDENCIES = c-ares host-grpc libabseil-cpp openssl protobuf re2 zlib
-HOST_GRPC_DEPENDENCIES = host-c-ares host-libabseil-cpp host-openssl host-protobuf \
-	host-re2 host-zlib
+HOST_GRPC_DEPENDENCIES = host-protobuf
 
 # gRPC_CARES_PROVIDER=package won't work because it requires c-ares to have
 # installed a cmake config file, but buildroot uses c-ares' autotools build,

@@ -70,14 +69,26 @@ GRPC_CONF_OPTS += \
 	-DCMAKE_C_FLAGS="$(GRPC_CFLAGS)" \
 	-DCMAKE_CXX_FLAGS="$(GRPC_CXXFLAGS)"
 
+# For host-grpc, we only need the 'grpc_cpp_plugin' binary, which is needed for
+# target grpc compilation. To avoid unnecessary build steps and host
+# dependencies, supply enough options to pass the configure checks without
+# requiring other host packages, unless those needed by grpc_cpp_plugin.
 HOST_GRPC_CONF_OPTS = \
-	-DgRPC_ABSL_PROVIDER=package \
-	-D_gRPC_CARES_LIBRARIES=cares \
-	-DgRPC_CARES_PROVIDER=none \
 	-DgRPC_PROTOBUF_PROVIDER=package \
-	-DgRPC_RE2_PROVIDER=package \
-	-DgRPC_SSL_PROVIDER=package \
-	-DgRPC_ZLIB_PROVIDER=package
+	-DgRPC_ABSL_PROVIDER=none \
+	-DgRPC_CARES_PROVIDER=none \
+	-DgRPC_RE2_PROVIDER=none \
+	-DgRPC_SSL_PROVIDER=none \
+	-DgRPC_ZLIB_PROVIDER=none \
+	-DgRPC_BUILD_CODEGEN=OFF \
+	-DgRPC_BUILD_CSHARP_EXT=OFF \
+	-DgRPC_BUILD_PLUGIN_SUPPORT_ONLY=ON \
+	-DgRPC_BUILD_GRPC_CSHARP_PLUGIN=OFF \
+	-DgRPC_BUILD_GRPC_NODE_PLUGIN=OFF \
+	-DgRPC_BUILD_GRPC_OBJECTIVE_C_PLUGIN=OFF \
+	-DgRPC_BUILD_GRPC_PHP_PLUGIN=OFF \
+	-DgRPC_BUILD_GRPC_PYTHON_PLUGIN=OFF \
+	-DgRPC_BUILD_GRPC_RUBY_PLUGIN=OFF
 
 $(eval $(cmake-package))
 $(eval $(host-cmake-package))

Hello Thomas,

+Yann, Arnout, Peter, to raise their attention on this patch.

Quoted 29 lines · On Tue, 25 May 2021 20:20:44 +0200 Thomas De Schampheleire…

From: Thomas De Schampheleire <[email protected]>

Currently, grpc depends on the full host-grpc, which in turn depends on host versions of many other libraries. One of these, host-libabseil-cpp, also requires a host gcc 4.9 or larger, a dependency which is not met on CentOS 7.
But in fact, the target grpc only needs the 'grpc_cpp_plugin' binary from host-grpc. And that binary does not depend on host-libabseil-cpp or other libraries, only on host-protobuf.

Given the above, simplify the grpc/host-grpc situation.
- Add a patch to the (host-)grpc CMakeLists.txt file to add an option to only build grpc_cpp_plugin.
- Update grpc.mk and Config.in to remove the unnecessary dependencies, and change the host-grpc configure options to make cmake happy.

The advantages of these changes are:
- making grpc available to older hosts with gcc < 4.8, like CentOS 7
- significantly reducing the build time of host-grpc and its dependencies

The patch was proposed upstream but not accepted with below rationale. Perhaps input from others can help in persuading upstream in a future attempt.

'What you're doing sounds like quite a narrow use case. But we simply cannot provide a cmake option for every possible scenario in the world. Introducing a new cmake option isn't for free and requires careful design and maintenance.'

Quoted 5 lines

Nevertheless, given the benefits in terms of build time and dependency reduction, it makes sense to apply this patch in spite of the disadvantage of a local non-upstreamed patch.

Signed-off-by Thomas De Schampheleire <[email protected]>

So I had a look at this, and indeed, upstream has not been very supportive. The patch on CMakeLists.txt that you have is not too crazy, but it would certainly be a bit annoying to maintain forever (even though for some packages, like python3, we do have many more patches than that).

I have thought of enabling the download of the git submodules for just the host variant, and use the make target that builds just the native tool that is needed. However, using the git submodules just for the host variant doesn't work: the tarball has to be the same between host and target. An option would be to have a separate package, for just the host variant. A bit meh.

Perhaps we should just take your patch in fact? :-)

Yann, Peter, Arnout, any opinion on this?

Best regards,

Thomas

Quoted 310 lines

---

v2: fix typo in Config.in comment (Baruch Siach)

  .../grpc/0004-host-grpc-only-cpp-plugin.patch | 223 ++++++++++++++++++
  package/grpc/Config.in                        |   6 +-
  package/grpc/grpc.mk                          |  27 ++-
  3 files changed, 244 insertions(+), 12 deletions(-)

create mode 100644 package/grpc/0004-host-grpc-only-cpp-plugin.patch

package/grpc/0004-host-grpc-only-cpp-plugin.patch new file +223 -0

new file mode 100644
index 0000000000..43fad7e3d6
@@ -0,0 +1,223 @@
+From a1922eadfc87da3dd221ff631f94ddd4a8ee7049 Mon Sep 17 00:00:00 2001
+From: Thomas De Schampheleire <[email protected]>
+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 <[email protected]>
+---
+ 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
+

package/grpc/Config.in +2 -4

index d1bf0d078d..ad3ddbcf19 100644
@@ -4,7 +4,6 @@ config BR2_PACKAGE_GRPC
  	depends on BR2_TOOLCHAIN_HAS_THREADS # protobuf, re2
  	depends on BR2_PACKAGE_PROTOBUF_ARCH_SUPPORTS # protobuf
  	depends on BR2_TOOLCHAIN_GCC_AT_LEAST_4_9 # protobuf, re2, libabseil-cpp
-	depends on BR2_HOST_GCC_AT_LEAST_4_9 # host-libabseil-cpp
  	depends on !BR2_STATIC_LIBS # protobuf, libabseil-cpp
  	depends on BR2_TOOLCHAIN_HAS_SYNC_4 || BR2_TOOLCHAIN_HAS_ATOMIC
  	depends on BR2_PACKAGE_LIBABSEIL_CPP_ARCH_SUPPORTS

@@ -20,10 +19,9 @@ config BR2_PACKAGE_GRPC
 
  	  http://github.com/grpc/grpc
 
-comment "grpc needs a toolchain w/ C++, threads, dynamic library, gcc >= 4.9, host gcc >= 4.9"
+comment "grpc needs a toolchain w/ C++, threads, dynamic library, gcc >= 4.9"
  	depends on BR2_PACKAGE_LIBABSEIL_CPP_ARCH_SUPPORTS
  	depends on BR2_TOOLCHAIN_HAS_SYNC_4 || BR2_TOOLCHAIN_HAS_ATOMIC
  	depends on !BR2_INSTALL_LIBSTDCPP || !BR2_TOOLCHAIN_HAS_THREADS \
-		|| BR2_STATIC_LIBS || !BR2_TOOLCHAIN_GCC_AT_LEAST_4_9 \
-		|| !BR2_HOST_GCC_AT_LEAST_4_9
+		|| BR2_STATIC_LIBS || !BR2_TOOLCHAIN_GCC_AT_LEAST_4_9
  	depends on BR2_PACKAGE_PROTOBUF_ARCH_SUPPORTS

package/grpc/grpc.mk +19 -8

index ee8dc38e70..8718b0e956 100644
@@ -14,8 +14,7 @@ GRPC_INSTALL_STAGING = YES
 
  # Need to use host grpc_cpp_plugin during cross compilation.
  GRPC_DEPENDENCIES = c-ares host-grpc libabseil-cpp openssl protobuf re2 zlib
-HOST_GRPC_DEPENDENCIES = host-c-ares host-libabseil-cpp host-openssl host-protobuf \
-	host-re2 host-zlib
+HOST_GRPC_DEPENDENCIES = host-protobuf
 
  # gRPC_CARES_PROVIDER=package won't work because it requires c-ares to have
  # installed a cmake config file, but buildroot uses c-ares' autotools build,

@@ -70,14 +69,26 @@ GRPC_CONF_OPTS += \
  	-DCMAKE_C_FLAGS="$(GRPC_CFLAGS)" \
  	-DCMAKE_CXX_FLAGS="$(GRPC_CXXFLAGS)"
 
+# For host-grpc, we only need the 'grpc_cpp_plugin' binary, which is needed for
+# target grpc compilation. To avoid unnecessary build steps and host
+# dependencies, supply enough options to pass the configure checks without
+# requiring other host packages, unless those needed by grpc_cpp_plugin.
  HOST_GRPC_CONF_OPTS = \
-	-DgRPC_ABSL_PROVIDER=package \
-	-D_gRPC_CARES_LIBRARIES=cares \
-	-DgRPC_CARES_PROVIDER=none \
  	-DgRPC_PROTOBUF_PROVIDER=package \
-	-DgRPC_RE2_PROVIDER=package \
-	-DgRPC_SSL_PROVIDER=package \
-	-DgRPC_ZLIB_PROVIDER=package
+	-DgRPC_ABSL_PROVIDER=none \
+	-DgRPC_CARES_PROVIDER=none \
+	-DgRPC_RE2_PROVIDER=none \
+	-DgRPC_SSL_PROVIDER=none \
+	-DgRPC_ZLIB_PROVIDER=none \
+	-DgRPC_BUILD_CODEGEN=OFF \
+	-DgRPC_BUILD_CSHARP_EXT=OFF \
+	-DgRPC_BUILD_PLUGIN_SUPPORT_ONLY=ON \
+	-DgRPC_BUILD_GRPC_CSHARP_PLUGIN=OFF \
+	-DgRPC_BUILD_GRPC_NODE_PLUGIN=OFF \
+	-DgRPC_BUILD_GRPC_OBJECTIVE_C_PLUGIN=OFF \
+	-DgRPC_BUILD_GRPC_PHP_PLUGIN=OFF \
+	-DgRPC_BUILD_GRPC_PYTHON_PLUGIN=OFF \
+	-DgRPC_BUILD_GRPC_RUBY_PLUGIN=OFF
 

package/grpc/grpc.mk GRPC_CONF_OPTS += \ · line 94

Quoted 2 lines

package/grpc/grpc.mk +0 -0

  $(eval $(cmake-package))
  $(eval $(host-cmake-package))

Hello Thomas,

+Yann, Arnout, Peter, to raise their attention on this patch.

Quoted 29 lines · On Tue, 25 May 2021 20:20:44 +0200 Thomas De Schampheleire…

From: Thomas De Schampheleire <[email protected]>

Currently, grpc depends on the full host-grpc, which in turn depends on host versions of many other libraries. One of these, host-libabseil-cpp, also requires a host gcc 4.9 or larger, a dependency which is not met on CentOS 7.
But in fact, the target grpc only needs the 'grpc_cpp_plugin' binary from host-grpc. And that binary does not depend on host-libabseil-cpp or other libraries, only on host-protobuf.

Given the above, simplify the grpc/host-grpc situation.
- Add a patch to the (host-)grpc CMakeLists.txt file to add an option to only build grpc_cpp_plugin.
- Update grpc.mk and Config.in to remove the unnecessary dependencies, and change the host-grpc configure options to make cmake happy.

The advantages of these changes are:
- making grpc available to older hosts with gcc < 4.8, like CentOS 7
- significantly reducing the build time of host-grpc and its dependencies

The patch was proposed upstream but not accepted with below rationale. Perhaps input from others can help in persuading upstream in a future attempt.

'What you're doing sounds like quite a narrow use case. But we simply cannot provide a cmake option for every possible scenario in the world. Introducing a new cmake option isn't for free and requires careful design and maintenance.'

Quoted 5 lines

Nevertheless, given the benefits in terms of build time and dependency reduction, it makes sense to apply this patch in spite of the disadvantage of a local non-upstreamed patch.

Signed-off-by Thomas De Schampheleire <[email protected]>

So I had a look at this, and indeed, upstream has not been very supportive. The patch on CMakeLists.txt that you have is not too crazy, but it would certainly be a bit annoying to maintain forever (even though for some packages, like python3, we do have many more patches than that).

I have thought of enabling the download of the git submodules for just the host variant, and use the make target that builds just the native tool that is needed. However, using the git submodules just for the host variant doesn't work: the tarball has to be the same between host and target. An option would be to have a separate package, for just the host variant. A bit meh.

Perhaps we should just take your patch in fact? :-)

Yann, Peter, Arnout, any opinion on this?

Best regards,

Thomas

Quoted 310 lines

---

v2: fix typo in Config.in comment (Baruch Siach)

  .../grpc/0004-host-grpc-only-cpp-plugin.patch | 223 ++++++++++++++++++
  package/grpc/Config.in                        |   6 +-
  package/grpc/grpc.mk                          |  27 ++-
  3 files changed, 244 insertions(+), 12 deletions(-)

create mode 100644 package/grpc/0004-host-grpc-only-cpp-plugin.patch

package/grpc/0004-host-grpc-only-cpp-plugin.patch new file +223 -0

new file mode 100644
index 0000000000..43fad7e3d6
@@ -0,0 +1,223 @@
+From a1922eadfc87da3dd221ff631f94ddd4a8ee7049 Mon Sep 17 00:00:00 2001
+From: Thomas De Schampheleire <[email protected]>
+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 <[email protected]>
+---
+ 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
+

package/grpc/Config.in +2 -4

index d1bf0d078d..ad3ddbcf19 100644
@@ -4,7 +4,6 @@ config BR2_PACKAGE_GRPC
  	depends on BR2_TOOLCHAIN_HAS_THREADS # protobuf, re2
  	depends on BR2_PACKAGE_PROTOBUF_ARCH_SUPPORTS # protobuf
  	depends on BR2_TOOLCHAIN_GCC_AT_LEAST_4_9 # protobuf, re2, libabseil-cpp
-	depends on BR2_HOST_GCC_AT_LEAST_4_9 # host-libabseil-cpp
  	depends on !BR2_STATIC_LIBS # protobuf, libabseil-cpp
  	depends on BR2_TOOLCHAIN_HAS_SYNC_4 || BR2_TOOLCHAIN_HAS_ATOMIC
  	depends on BR2_PACKAGE_LIBABSEIL_CPP_ARCH_SUPPORTS

@@ -20,10 +19,9 @@ config BR2_PACKAGE_GRPC
 
  	  http://github.com/grpc/grpc
 
-comment "grpc needs a toolchain w/ C++, threads, dynamic library, gcc >= 4.9, host gcc >= 4.9"
+comment "grpc needs a toolchain w/ C++, threads, dynamic library, gcc >= 4.9"
  	depends on BR2_PACKAGE_LIBABSEIL_CPP_ARCH_SUPPORTS
  	depends on BR2_TOOLCHAIN_HAS_SYNC_4 || BR2_TOOLCHAIN_HAS_ATOMIC
  	depends on !BR2_INSTALL_LIBSTDCPP || !BR2_TOOLCHAIN_HAS_THREADS \
-		|| BR2_STATIC_LIBS || !BR2_TOOLCHAIN_GCC_AT_LEAST_4_9 \
-		|| !BR2_HOST_GCC_AT_LEAST_4_9
+		|| BR2_STATIC_LIBS || !BR2_TOOLCHAIN_GCC_AT_LEAST_4_9
  	depends on BR2_PACKAGE_PROTOBUF_ARCH_SUPPORTS

package/grpc/grpc.mk +19 -8

index ee8dc38e70..8718b0e956 100644
@@ -14,8 +14,7 @@ GRPC_INSTALL_STAGING = YES
 
  # Need to use host grpc_cpp_plugin during cross compilation.
  GRPC_DEPENDENCIES = c-ares host-grpc libabseil-cpp openssl protobuf re2 zlib
-HOST_GRPC_DEPENDENCIES = host-c-ares host-libabseil-cpp host-openssl host-protobuf \
-	host-re2 host-zlib
+HOST_GRPC_DEPENDENCIES = host-protobuf
 
  # gRPC_CARES_PROVIDER=package won't work because it requires c-ares to have
  # installed a cmake config file, but buildroot uses c-ares' autotools build,

@@ -70,14 +69,26 @@ GRPC_CONF_OPTS += \
  	-DCMAKE_C_FLAGS="$(GRPC_CFLAGS)" \
  	-DCMAKE_CXX_FLAGS="$(GRPC_CXXFLAGS)"
 
+# For host-grpc, we only need the 'grpc_cpp_plugin' binary, which is needed for
+# target grpc compilation. To avoid unnecessary build steps and host
+# dependencies, supply enough options to pass the configure checks without
+# requiring other host packages, unless those needed by grpc_cpp_plugin.
  HOST_GRPC_CONF_OPTS = \
-	-DgRPC_ABSL_PROVIDER=package \
-	-D_gRPC_CARES_LIBRARIES=cares \
-	-DgRPC_CARES_PROVIDER=none \
  	-DgRPC_PROTOBUF_PROVIDER=package \
-	-DgRPC_RE2_PROVIDER=package \
-	-DgRPC_SSL_PROVIDER=package \
-	-DgRPC_ZLIB_PROVIDER=package
+	-DgRPC_ABSL_PROVIDER=none \
+	-DgRPC_CARES_PROVIDER=none \
+	-DgRPC_RE2_PROVIDER=none \
+	-DgRPC_SSL_PROVIDER=none \
+	-DgRPC_ZLIB_PROVIDER=none \
+	-DgRPC_BUILD_CODEGEN=OFF \
+	-DgRPC_BUILD_CSHARP_EXT=OFF \
+	-DgRPC_BUILD_PLUGIN_SUPPORT_ONLY=ON \
+	-DgRPC_BUILD_GRPC_CSHARP_PLUGIN=OFF \
+	-DgRPC_BUILD_GRPC_NODE_PLUGIN=OFF \
+	-DgRPC_BUILD_GRPC_OBJECTIVE_C_PLUGIN=OFF \
+	-DgRPC_BUILD_GRPC_PHP_PLUGIN=OFF \
+	-DgRPC_BUILD_GRPC_PYTHON_PLUGIN=OFF \
+	-DgRPC_BUILD_GRPC_RUBY_PLUGIN=OFF
 

package/grpc/grpc.mk GRPC_CONF_OPTS += \ · line 94

Quoted 2 lines

package/grpc/grpc.mk +0 -0

  $(eval $(cmake-package))
  $(eval $(host-cmake-package))