在交叉编译时，我应该怎么处理C ++库？ [英] What must I do with C++ libraries on cross compilation?

问题描述

这是我的编译器部分我的配置：

Here is my compiler part of my config:

IF(UNIX)
    ## Compiler flags

    # specify the cross compiler
    SET(CMAKE_C_COMPILER   /home/username/projects/buildroot/output/host/usr/bin/arm-linux-gcc)
    SET(CMAKE_CXX_COMPILER /home/username/projects/buildroot/output/host/usr/bin/arm-linux-g++)

    if(CMAKE_COMPILER_IS_GNUCXX)
        set(CMAKE_CXX_FLAGS "-O3")
        set(CMAKE_EXE_LINKER_FLAGS "-lsqlite3 -lrt -lpthread")
    endif()

    target_link_libraries(complex
      ${Boost_FILESYSTEM_LIBRARY}
      ${Boost_SYSTEM_LIBRARY})
ENDIF(UNIX)

有3个问题：-lsqlite3 -lrt -lpthread

There are 3 problems : -lsqlite3 -lrt -lpthread

我必须如何使它们适合我的架构，并在这里指定？

How must I to make them for my architecture and specify here? How to set (using set?) the path of compiled libraries after I will get them recompiled for my architecture somehow?

推荐答案

如果设置（使用set？）编译库的路径，你想做交叉编译与CMake你真的应该使用一个工具链文件。有关介绍，请参见 CMake Wiki 。为了使用第三方库（即不包括在交叉编译工具链中），您还需要对它们进行交叉编译。

If you want to do cross-compilation with CMake you really should use a toolchain file for that. See the CMake Wiki for an introduction. In order to use third-party libraries (i.e. not included by the cross-compilation toolchain) you need to cross-compile them too.

编辑：由于您使用buildroot工具链，您可以使用已经包含的CMake工具链文件。调用CMake时，只需传递 -DCMAKE_TOOLCHAIN_FILE = / home / username / projects / buildroot / output / toolchainfile.cmake 无需在您的 CMakeLists.txt CMAKE_C_COMPILER 和 CMAKE_CXX_COMPILER >文件。此外，设置 CMAKE_CXX_FLAGS 和 CMAKE_EXE_LINKER_FLAGS 被认为是非常糟糕的做法。

Edit: Since you are using the buildroot toolchain, you can use the already included CMake toolchain file. Just pass -DCMAKE_TOOLCHAIN_FILE=/home/username/projects/buildroot/output/toolchainfile.cmake when invoking CMake. No need to set CMAKE_C_COMPILER and CMAKE_CXX_COMPILER in your CMakeLists.txt file. Also, setting CMAKE_CXX_FLAGS and CMAKE_EXE_LINKER_FLAGS is considered to be very bad practice.

据推测，在构建buildroot工具链时，您已经构建了sqlite3，因此您可以像任何其他库一样使用它。 Ie：

Presumably you have built sqlite3 while building the buildroot toolchain, so you can use it just like any other library. I.e:

find_path(SQLITE3_INCLUDE_DIR sqlite3.h)
find_library(SQLITE3_LIBRARY sqlite3)
if(NOT SQLITE3_INCLUDE_DIR)
  message(SEND_ERROR "Failed to find sqlite3.h")
endif()
if(NOT SQLITE3_LIBRARY)
  message(SEND_ERROR "Failed to find the sqlite3 library")
endif()

find_package(Threads REQUIRED)

# ...

target_link_libraries(complex
  ${Boost_FILESYSTEM_LIBRARY}
  ${Boost_SYSTEM_LIBRARY}
  ${SQLITE3_LIBRARY}
  ${CMAKE_THREAD_LIBS_INIT}
  rt)

最后，不要将 CMAKE_CXX_FLAGS 设置为 -O3 。在配置项目时，用户应该传递 -DCMAKE_BUILD_TYPE = Release 。

Lastly, do not set CMAKE_CXX_FLAGS to -O3. The user should pass -DCMAKE_BUILD_TYPE=Release when configuring the project instead.

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