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c++ - 跨平台 Poco 库链接问题

问题描述

我使用特殊的 arm 工具链文件和构建脚本在 Ubuntu amd 平台上使用 cmake 编译了 Poco：

#!/bin/sh

cd cmake_build
cmake \
    -G "Unix Makefiles" \
    -DCMAKE_BUILD_TYPE=Debug \
    -DCMAKE_TOOLCHAIN_FILE=~/RPi/Toolchain-RaspberryPi.cmake \
    -DCMAKE_INSTALL_PREFIX=~/RPi/rootfs/usr/local \
    ..

make -j4

工具链文件：

SET(CMAKE_SYSTEM_NAME Linux)
SET(CMAKE_SYSTEM_VERSION 1)

# Specify the cross compiler
SET(CMAKE_C_COMPILER $ENV{HOME}/RPi/tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian-x64/bin/arm-linux-gnueabihf-gcc)
SET(CMAKE_CXX_COMPILER $ENV{HOME}/RPi/tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian-x64/bin/arm-linux-gnueabihf-g++)

# Where is the target environment
SET(CMAKE_FIND_ROOT_PATH $ENV{HOME}/RPi/rootfs)
SET(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} --sysroot=${CMAKE_FIND_ROOT_PATH}")
SET(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} --sysroot=${CMAKE_FIND_ROOT_PATH}")
SET(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} --sysroot=${CMAKE_FIND_ROOT_PATH}")

# Search for programs only in the build host directories
SET(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)

# Search for libraries and headers only in the target directories
SET(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
SET(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)

我将 poco 安装make install到预配置文件夹：~/RPi/rootfs/usr/local/.

我将所有 Poco 文件复制到 Raspberry 文件系统 - lib, lib/cmake, include.

我有跟随cmake的小测试项目：

cmake_minimum_required (VERSION 3.7)

# Name of the project
project(raspi_ld_test)
message("BUILD ENVIRONMENT SET TO -${BUILD_ENV}-")

if (${BUILD_ENV} STREQUAL "UBUNTU")
  set(POCO_PATH "~/RPi/rootfs/usr/local")
elseif(${BUILD_ENV} STREQUAL "RASPI")
  set(POCO_PATH "/usr/local")
else()
  message(FATAL_ERROR "Undefined environment")
endif()

find_package(Poco REQUIRED Foundation Util HINTS ${POCO_PATH} NO_CMAKE_FIND_ROOT_PATH)
find_package(Threads REQUIRED)

# Alert the user if we do not find it
if(NOT WPI_LIB)
    message(FATAL_ERROR "wiringPi library not found")
endif()

# Add the local ‘include’ directory and the wiringPi directory to grab headers
include_directories("${POCO_PATH}/include")

set(CMAKE_CXX_STANDARD 14)
set(CMAKE_CXX_STANDARD_REQUIRED on)

# Add all the *.cpp files in our source directory to our executable output
file(
  GLOB_RECURSE 
  SOURCES 
  "src/*.cpp"
)

add_executable(raspi_ld_test ${SOURCES})

link_directories(${POCO_PATH}/lib)

# Link the pre-compiled wiringPi library to the executable we just declared 
target_link_libraries(
  raspi_ld_test
  ${CMAKE_THREAD_LIBS_INIT}
  Poco::Foundation
)

我只有一个 src/main.cpp：

#include "Poco/BasicEvent.h"
#include "Poco/Delegate.h"
#include <iostream>

using Poco::BasicEvent;
using Poco::Delegate;

class Source
{
public:
    BasicEvent<int> theEvent;

    void fireEvent(int n)
    {
        theEvent(this, n);
    }
};

class Target
{
public:
    void onEvent(const void* pSender, int& arg)
    {
        std::cout << "onEvent: " << arg << std::endl;
    }
};

int main(int argc, char** argv)
{
    Source source;
    Target target;

    source.theEvent += Delegate<Target, int>(
        &target, &Target::onEvent);

    source.fireEvent(42);

    source.theEvent -= Delegate<Target, int>(
        &target, &Target::onEvent);

    return 0;
}

现在，我可以在 Ubuntu 上成功编译项目了。如果我将 raspi_ld_test 复制到 Raspberry，我可以成功运行它。但！我无法在 Raspberry 上构建项目，出现以下错误：

CMakeFiles/raspi_ld_test.dir/src/main.cpp.o: 在函数 Poco::MutexImpl::lockImpl()': /usr/local/include/Poco/Mutex_POSIX.h:60: undefined reference to Poco::SystemException::SystemException(std::__cxx11::basic_string, std::allocator > const&, int)' CMakeFiles/raspi_ld_test.dir/src/ main.cpp.o: 在函数 Poco::MutexImpl::unlockImpl()': /usr/local/include/Poco/Mutex_POSIX.h:79: undefined reference to Poco::SystemException::SystemException(std::__cxx11::basic_string, std::allocator > const&, int)' collect2: 错误： ld 返回 1 退出状态 CMakeFiles/raspi_ld_test.dir/build .make:99: 目标 'raspi_ld_test' 的配方失败 make[2]: * [raspi_ld_test] 错误 1 ​​CMakeFiles/Makefile2:67: 目标'CMakeFiles/raspi_ld_test.dir/all' 的配方失败 make[1]: * [CMakeFiles /raspi_ld_test.dir/all] 错误 2 Makefile:83: 目标“all”的配方失败 make: *** [all] 错误 2

我看到库链接成功：

pi@raspberrypi:/usr/local/lib $ ldd libPocoFoundationd.so
    linux-vdso.so.1 (0x7ef90000)
    /usr/lib/arm-linux-gnueabihf/libarmmem.so (0x76bfe000)
    libpthread.so.0 => /lib/arm-linux-gnueabihf/libpthread.so.0 (0x76bd5000)
    libdl.so.2 => /lib/arm-linux-gnueabihf/libdl.so.2 (0x76bc2000)
    librt.so.1 => /lib/arm-linux-gnueabihf/librt.so.1 (0x76bab000)
    libstdc++.so.6 => /usr/lib/arm-linux-gnueabihf/libstdc++.so.6 (0x76a63000)
    libm.so.6 => /lib/arm-linux-gnueabihf/libm.so.6 (0x769e4000)
    libgcc_s.so.1 => /lib/arm-linux-gnueabihf/libgcc_s.so.1 (0x769b7000)
    libc.so.6 => /lib/arm-linux-gnueabihf/libc.so.6 (0x76878000)
    /lib/ld-linux-armhf.so.3 (0x76f03000)

更新

这是在 amd 上编译并复制到 arm 可执行文件的 ldd 输出：

pi@raspberrypi:~/raspi_ld_test/build $ ldd raspi_ld_test 
    linux-vdso.so.1 (0x7efd0000)
    /usr/lib/arm-linux-gnueabihf/libarmmem.so (0x76f0f000)
    libwiringPi.so => /usr/lib/libwiringPi.so (0x76ef1000)
    libPocoUtild.so.60 => /usr/local/lib/libPocoUtild.so.60 (0x76e35000)
    libpthread.so.0 => /lib/arm-linux-gnueabihf/libpthread.so.0 (0x76e0c000)
    libPocoXMLd.so.60 => /usr/local/lib/libPocoXMLd.so.60 (0x76d1f000)
    libPocoJSONd.so.60 => /usr/local/lib/libPocoJSONd.so.60 (0x76c8b000)
    libPocoFoundationd.so.60 => /usr/local/lib/libPocoFoundationd.so.60 (0x7699c000)
    libdl.so.2 => /lib/arm-linux-gnueabihf/libdl.so.2 (0x76989000)
    librt.so.1 => /lib/arm-linux-gnueabihf/librt.so.1 (0x76972000)
    libstdc++.so.6 => /usr/lib/arm-linux-gnueabihf/libstdc++.so.6 (0x7682a000)
    libm.so.6 => /lib/arm-linux-gnueabihf/libm.so.6 (0x767ab000)
    libgcc_s.so.1 => /lib/arm-linux-gnueabihf/libgcc_s.so.1 (0x7677e000)
    libc.so.6 => /lib/arm-linux-gnueabihf/libc.so.6 (0x7663f000)
    libcrypt.so.1 => /lib/arm-linux-gnueabihf/libcrypt.so.1 (0x76600000)
    /lib/ld-linux-armhf.so.3 (0x76f25000)

这是运行的输出：

pi@raspberrypi:~/raspi_ld_test/build $ ./raspi_ld_test 
onEvent: 42

问题是：在 amd 上为 arm 编译的 Poco 库怎么可能有利于 arm 上的运行时链接，但不适合 arm 上的构建时链接，以及我需要做什么才能在 arm 上构建项目？

更新

因此，正如我从评论中看到的那样，使用不同版本的 g++ 在 amd 上使用 arm 工具链编译的库是不可能在 arm 上编译项目的......
我有以下版本：

Ubuntu 上的 ARM 工具链：

olga@olga-MS-7758:~/raspi_ld_test$ ~/RPi/tools/arm-bcm2708/arm-linux-gnueabihf/bin/arm-linux-gnueabihf-g++ --version
arm-linux-gnueabihf-g++ (crosstool-NG crosstool-ng-1.22.0-88-g8460611) 4.9.3
Copyright (C) 2015 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Raspbian 上的 ARM 工具链：

pi@raspberrypi:~/Poco/cmake $ g++ --version
g++ (Raspbian 6.3.0-18+rpi1+deb9u1) 6.3.0 20170516
Copyright (C) 2016 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

所以我需要搜索为 Ubuntu 编译的 BCM (raspberry) 6.3 g++？

标签： c++cmakepoco

解决方案

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