Cmake CROSS COMPILE problem [PLEASE HELP, URGENT] #yocto #toolchain #sdk

Cmake CROSS COMPILE problem [PLEASE HELP, URGENT] #yocto #toolchain #sdk

[Bel Hadj Salem Talel]

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Hi All,

I'm in serious task here and I need to cross compile a Cmake project.
I need to send an SDK to a client with steps to cross compile the project.
This project is compiling successfully via a Yocto recipe that inherits cmake.
I extracted an SDK from the main image adding TOOLCHAIN_HOST_TASK_append=" nativesdk-cmake" to add the Toolchain cmake file which is located under: /home/talel/Documents/sensesdk/sysroots/x86_64-pokysdk-linux/usr/share/cmake/OEToolchainConfig.cmake :
Here is its content:

*set( CMAKE_SYSTEM_NAME Linux )*
*set( CMAKE_C_FLAGS $ENV{CFLAGS} CACHE STRING "" FORCE )*
*set( CMAKE_CXX_FLAGS $ENV{CXXFLAGS}  CACHE STRING "" FORCE )*
*set( CMAKE_ASM_FLAGS ${CMAKE_C_FLAGS} CACHE STRING "" FORCE )*
*set( CMAKE_LDFLAGS_FLAGS ${CMAKE_CXX_FLAGS} CACHE STRING "" FORCE )*
*set( CMAKE_SYSROOT $ENV{OECORE_TARGET_SYSROOT} )*
*set( CMAKE_FIND_ROOT_PATH $ENV{OECORE_TARGET_SYSROOT} )*
*set( CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER )*
*set( CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY )*
*set( CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY )*
*set( CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY )*
*set(CMAKE_FIND_LIBRARY_CUSTOM_LIB_SUFFIX "$ENV{OE_CMAKE_FIND_LIBRARY_CUSTOM_LIB_SUFFIX}")*
*# Set CMAKE_SYSTEM_PROCESSOR from the sysroot name (assuming processor-distro-os).*
*if ($ENV{SDKTARGETSYSROOT} MATCHES "/sysroots/([a-zA-Z0-9_-]+)-.+-.+")*
*set(CMAKE_SYSTEM_PROCESSOR ${CMAKE_MATCH_1})*
*endif()*
*# Include the toolchain configuration subscripts*
*file( GLOB toolchain_config_files "${CMAKE_TOOLCHAIN_FILE}.d/*.cmake" )*
*foreach(config ${toolchain_config_files})*
*include(${config})*
*endforeach()*

The project is working with gRPC and Protobuf. There is a .cmake files that are responsible for searching for gRPC and Protobuf libs

Here is what I tried after sourcing the SDK environment:
1) A simple "cmake .." with no options:

*Setting build type to 'RelWithDebInfo' as none was specified.*
*-- Toolchain file defaulted to '/home/talel/Documents/sensesdk/sysroots/x86_64-pokysdk-linux/usr/share/cmake/OEToolchainConfig.cmake'*
*-- The C compiler identification is GNU 7.3.0*
*-- The CXX compiler identification is GNU 7.3.0*
*-- Check for working C compiler: /home/talel/Documents/sensesdk/sysroots/x86_64-pokysdk-linux/usr/bin/aarch64-poky-linux/aarch64-poky-linux-gcc*
*-- Check for working C compiler: /home/talel/Documents/sensesdk/sysroots/x86_64-pokysdk-linux/usr/bin/aarch64-poky-linux/aarch64-poky-linux-gcc -- works*
*-- Detecting C compiler ABI info*
*-- Detecting C compiler ABI info - done*
*-- Detecting C compile features*
*-- Detecting C compile features - done*
*-- Check for working CXX compiler: /home/talel/Documents/sensesdk/sysroots/x86_64-pokysdk-linux/usr/bin/aarch64-poky-linux/aarch64-poky-linux-g++*
*-- Check for working CXX compiler: /home/talel/Documents/sensesdk/sysroots/x86_64-pokysdk-linux/usr/bin/aarch64-poky-linux/aarch64-poky-linux-g++ -- works*
*-- Detecting CXX compiler ABI info*
*-- Detecting CXX compiler ABI info - done*
*-- Detecting CXX compile features*
*-- Detecting CXX compile features - done*
*CMake Warning at /home/talel/Documents/sensesdk/sysroots/x86_64-pokysdk-linux/usr/share/cmake-3.16/Modules/FindProtobuf.cmake:499 (message):*
*Protobuf compiler version 3.12.3 doesn't match library version 3.11.4*
*Call Stack (most recent call first):*
*CMakeLists.txt:23 (find_package)*
*-- Found Protobuf: /home/talel/Documents/sensesdk/sysroots/aarch64-poky-linux/usr/lib/libprotobuf.so;-lpthread (found version "3.11.4")*
*-- Could NOT find gRPC (missing: GRPC_CPP_PLUGIN)*
*-- Configuring done*
*-- Generating done*
*-- Build files have been written to: /home/talel/Desktop/sense_software_2/build*

protobuf is found, but not gRPC, now when I make:
*make[2]: *** No rule to make target 'GRPC_CPP_PLUGIN-NOTFOUND', needed by 'protos/sense_api_settings.grpc.pb.cc'.  Stop.*
*CMakeFiles/Makefile2:734: recipe for target 'protos/CMakeFiles/sense_api_settings_grpc.dir/all' failed*
*make[1]: *** [protos/CMakeFiles/sense_api_settings_grpc.dir/all] Error 2*
*Makefile:129: recipe for target 'all' failed*
*make: *** [all] Error 2

* I searched for a solution and I added the *-DCMAKE_PREFIX_PATH=/home/talel/Documents/sensesdk/sysroots/aarch64-poky-linux/usr* option to my SDK rootfs
Here is the result of cmake..:

*-- Check for working C compiler: /home/talel/Documents/sensesdk/sysroots/x86_64-pokysdk-linux/usr/bin/aarch64-poky-linux/aarch64-poky-linux-gcc -- broken*
*CMake Error at /home/talel/Documents/sensesdk/sysroots/x86_64-pokysdk-linux/usr/share/cmake-3.16/Modules/CMakeTestCCompiler.cmake:60 (message):*
*The C compiler*
*"/home/talel/Documents/sensesdk/sysroots/x86_64-pokysdk-linux/usr/bin/aarch64-poky-linux/aarch64-poky-linux-gcc"*
*is not able to compile a simple test program.*
*It fails with the following output:*
*Change Dir: /home/talel/Desktop/sense_software_2/build/CMakeFiles/CMakeTmp*
*Run Build Command(s):/home/talel/Documents/sensesdk/sysroots/aarch64-poky-linux/usr/bin/make cmTC_2a27c/fast && /home/talel/Documents/sensesdk/sysroots/aarch64-poky-linux/usr/bin/make: 1: /home/talel/Documents/sensesdk/sysroots/aarch64-poky-linux/usr/bin/make: Syntax error: word unexpected (expecting ")")*

I tried to add C and CXX options : *-DCMAKE_C_COMPILER_WORKS=1 -DCMAKE_CXX_COMPILER_WORKS=1* :
Now it shows this:

*/home/talel/Documents/sensesdk/sysroots/aarch64-poky-linux/usr/bin/protoc: 1: /home/talel/Documents/sensesdk/sysroots/aarch64-poky-linux/usr/bin/protoc: ELF\x02\x01\x01\x02�\x01\x14\x12@2@8: not found*
*/home/talel/Documents/sensesdk/sysroots/aarch64-poky-linux/usr/bin/protoc: 2: /home/talel/Documents/sensesdk/sysroots/aarch64-poky-linux/usr/bin/protoc: Syntax error: ")" unexpected*
*CMake Warning at /home/talel/Documents/sensesdk/sysroots/x86_64-pokysdk-linux/usr/share/cmake-3.16/Modules/FindProtobuf.cmake:499 (message):*
*Protobuf compiler version doesn't match library version 3.11.4*

and now when I make same error ; syntax error in protobuf

Here is the main CMakeLists:
cmake_minimum_required (VERSION 3.5)

set (ex_ver "01" )

# Set a default build type if none was specified
if ( NOT CMAKE_BUILD_TYPE AND NOT CMAKE_CONFIGURATION_TYPES)
message ( "Setting build type to 'RelWithDebInfo' as none was specified." )
set (CMAKE_BUILD_TYPE RelWithDebInfo CACHE STRING "Choose the type of build." FORCE)
# Set the possible values of build type for cmake-gui
set_property ( CACHE CMAKE_BUILD_TYPE PROPERTY STRINGS "Debug" "Release"
"MinSizeRel" "RelWithDebInfo" )
endif ()

project (ex VERSION ${ ex_ver })

# set the C++ standard to C++ 11
set (CMAKE_CXX_STANDARD 11)

list (APPEND CMAKE_MODULE_PATH ${PROJECT_SOURCE_DIR}/cmake)

include (CompileProtos)
set (protobuf_MODULE_COMPATIBLE TRUE )
find_package (Protobuf REQUIRED)
#find_package(gRPC REQUIRED)

set (_PROTOBUF_LIBPROTOBUF protobuf::libprotobuf)
if (CMAKE_CROSSCOMPILING)
find_program (_PROTOBUF_PROTOC protoc)
find_program (_gRPC_CPP_PLUGIN grpc_cpp_plugin)
else ()
set (_PROTOBUF_PROTOC $<TARGET_FILE:protobuf::protoc>)
endif ()
#message(STATUS "Using protobuf ${protobuf_VERSION}")

# Find gRPC installation
# Looks for gRPCConfig.cmake file installed by gRPC's cmake installation.
find_package (GRPC REQUIRED)

set (_GRPC_GRPCPP_REFLECTION gRPC::grpc++_reflection)
if (CMAKE_CROSSCOMPILING)
find_program (_GRPC_CPP_PLUGIN_EXECUTABLE grpc_cpp_plugin)
else ()
set (_GRPC_CPP_PLUGIN_EXECUTABLE $<TARGET_FILE:gRPC::grpc_cpp_plugin>)
endif ()

# uncomment for PC
#find_package(fmt REQUIRED)
#add_compile_definitions(SPDLOG_FMT_EXTERNAL)

#Add sub-directories
add_subdirectory (protos)
add_subdirectory (systemd)
add_subdirectory (certs)
add_subdirectory (services)
add_subdirectory (lib)
add_subdirectory (tools)
add_subdirectory (core)

Help me please on this. It is really urgent, I tried a lot.
Thanks, Talel

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Re: Cmake CROSS COMPILE problem [PLEASE HELP, URGENT] #sdk #yocto #toolchain

[jijonath11]

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I am also facing the same issue while compiling grpc.

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