From 24892b151a8f2012a5bfd9e3ae46ba379be133c7 Mon Sep 17 00:00:00 2001
From: alesapin <alesapin@gmail.com>
Date: Fri, 17 May 2024 22:52:25 +0200
Subject: [PATCH] Try to fix grpc for aarch64 crosscompilation

(cherry picked from commit f3fbf532e0d4d7616f51a9c3d5087cf7b2e6d7d5)
---
 cmake/target.cmake                |  5 +--
 contrib/grpc-cmake/CMakeLists.txt | 56 +++++++++++++++++++++++++++++++
 contrib/grpc-cmake/grpc.cmake     |  4 +++
 3 files changed, 61 insertions(+), 4 deletions(-)

diff --git a/cmake/target.cmake b/cmake/target.cmake
index fb911ace7b5..d4a40602b21 100644
--- a/cmake/target.cmake
+++ b/cmake/target.cmake
@@ -41,10 +41,7 @@ if (CMAKE_CROSSCOMPILING)
         set (ENABLE_ICU OFF CACHE INTERNAL "")
         set (ENABLE_FASTOPS OFF CACHE INTERNAL "")
     elseif (OS_LINUX OR OS_ANDROID)
-        if (ARCH_AARCH64)
-            # FIXME: broken dependencies
-            set (ENABLE_GRPC OFF CACHE INTERNAL "")
-        elseif (ARCH_PPC64LE)
+        if (ARCH_PPC64LE)
             set (ENABLE_GRPC OFF CACHE INTERNAL "")
         elseif (ARCH_RISCV64)
             # RISC-V support is preliminary
diff --git a/contrib/grpc-cmake/CMakeLists.txt b/contrib/grpc-cmake/CMakeLists.txt
index b8b5f5580c4..e7cf42cc87f 100644
--- a/contrib/grpc-cmake/CMakeLists.txt
+++ b/contrib/grpc-cmake/CMakeLists.txt
@@ -31,3 +31,59 @@ add_library(_ch_contrib_grpc INTERFACE)
 target_link_libraries(_ch_contrib_grpc INTERFACE ${gRPC_LIBRARIES})
 target_include_directories(_ch_contrib_grpc SYSTEM INTERFACE ${gRPC_INCLUDE_DIRS})
 add_library(ch_contrib::grpc ALIAS _ch_contrib_grpc)
+
+# Here we are trying to build a binary tool grpc_cpp_plugin in case of cross-compilation.
+# We need this file only during compilation process itself so we need it for our "host"
+# platform, not "target" platform.
+# If we are doing normal compilation this file will be produced in grpc.cmake.
+#
+# All code inside this block looks so weird because cmake fundametally doesn't
+# support different toolchains for different targets. So we just running it
+# in "bash script" fashion with different (actually without, i.e. default) toolchain.
+#
+# FIXME Sorry, I don't know cmake.
+if (NOT CMAKE_HOST_SYSTEM_NAME STREQUAL CMAKE_SYSTEM_NAME
+    OR NOT CMAKE_HOST_SYSTEM_PROCESSOR STREQUAL CMAKE_SYSTEM_PROCESSOR)
+
+    set (GRPC_CPP_PLUGIN_BUILD_DIR "${_gRPC_BINARY_DIR}/build")
+
+    execute_process(
+      COMMAND mkdir -p ${GRPC_CPP_PLUGIN_BUILD_DIR}
+      COMMAND_ECHO STDOUT
+    )
+
+    set(abseil_source_dir "${ClickHouse_SOURCE_DIR}/contrib/abseil-cpp")
+    set(protobuf_source_dir "${ClickHouse_SOURCE_DIR}/contrib/google-protobuf")
+    set(re2_source_dir "${ClickHouse_SOURCE_DIR}/contrib/re2")
+    set(ssl_source_dir "${ClickHouse_SOURCE_DIR}/contrib/openssl")
+    set(zlib_source_dir "${ClickHouse_SOURCE_DIR}/contrib/zlib-ng")
+    # For some reason config exists only in this directory
+    set(zlib_config_source_dir "${ClickHouse_BINARY_DIR}/contrib/zlib-ng-cmake")
+    set(cares_source_dir "${ClickHouse_SOURCE_DIR}/contrib/c-ares")
+    execute_process(
+        COMMAND ${CMAKE_COMMAND}
+            "-G${CMAKE_GENERATOR}"
+            "-DCMAKE_MAKE_PROGRAM=${CMAKE_MAKE_PROGRAM}"
+            "-DCMAKE_C_COMPILER=${CMAKE_C_COMPILER}"
+            "-DCMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER}"
+            "-DABSL_ROOT_DIR=${abseil_source_dir}"
+            "-DCMAKE_CXX_STANDARD_INCLUDE_DIRECTORIES=${zlib_config_source_dir}"
+            "-DgRPC_INSTALL=0"
+            "-DABSL_ENABLE_INSTALL=1"
+            "-DPROTOBUF_ROOT_DIR=${protobuf_source_dir}"
+            "-DRE2_ROOT_DIR=${re2_source_dir}"
+            "-DCARES_ROOT_DIR=${cares_source_dir}"
+            "-DBORINGSSL_ROOT_DIR=${ssl_source_dir}"
+            "-DZLIB_ROOT_DIR=${zlib_source_dir}"
+            "${_gRPC_SOURCE_DIR}"
+        WORKING_DIRECTORY "${GRPC_CPP_PLUGIN_BUILD_DIR}"
+        COMMAND_ECHO STDOUT)
+
+    execute_process(
+        COMMAND ${CMAKE_COMMAND} --build "${GRPC_CPP_PLUGIN_BUILD_DIR}"
+        COMMAND_ECHO STDOUT)
+
+    add_executable(grpc_cpp_plugin IMPORTED GLOBAL)
+    set_target_properties (grpc_cpp_plugin PROPERTIES IMPORTED_LOCATION "${GRPC_CPP_PLUGIN_BUILD_DIR}/grpc_cpp_plugin")
+    add_dependencies(grpc_cpp_plugin "${GRPC_CPP_PLUGIN_BUILD_DIR}/grpc_cpp_plugin")
+endif()
diff --git a/contrib/grpc-cmake/grpc.cmake b/contrib/grpc-cmake/grpc.cmake
index c2488539211..39645938f14 100644
--- a/contrib/grpc-cmake/grpc.cmake
+++ b/contrib/grpc-cmake/grpc.cmake
@@ -1829,6 +1829,8 @@ target_link_libraries(grpc_plugin_support
   ${_gRPC_PROTOBUF_PROTOC_LIBRARIES}
 )
 
+if (CMAKE_HOST_SYSTEM_NAME STREQUAL CMAKE_SYSTEM_NAME
+    AND CMAKE_HOST_SYSTEM_PROCESSOR STREQUAL CMAKE_SYSTEM_PROCESSOR)
 
 add_executable(grpc_cpp_plugin
   ${_gRPC_SOURCE_DIR}/src/compiler/cpp_plugin.cc
@@ -1852,3 +1854,5 @@ target_link_libraries(grpc_cpp_plugin
   ${_gRPC_ALLTARGETS_LIBRARIES}
   grpc_plugin_support
 )
+
+endif()