Question

首先：自一周以来，我已经阅读了所有相似的标题并在寻找。这个问题不是重复的，我非常挑剔。

基本上，我试图用docker使用clang作为树莓派3的交叉编译器来编译一个简单的helloWorld c ++程序。

我正在使用VM Ubuntu 18.04

编译器铛8 当我使用clang在docker中交叉编译代码时：

严重错误：“ bits / c ++ config.h”没有此类文件或目录...

这是CMakeLists.txt文件

cmake_minimum_required(VERSION 3.7.2)

set(CMAKE_SYSTEM_NAME Linux)
set(CMAKE_SYSTEM_PROCESSOR arm)

set(triple arm-linux-gnueabihf)

set(CMAKE_C_COMPILER clang)
set(CMAKE_C_COMPILER_TARGET ${triple})
set(CMAKE_CXX_COMPILER clang++)
set(CMAKE_CXX_COMPILER_TARGET ${triple})
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++17")

set(DCMAKE_CROSSCOMPILING=True)
set(DLLVM_DEFAULT_TARGET_TRIPLE=arm-linux-gnueabihf)
set(DLLVM_TARGET_ARCH=ARM)
set(DLLVM_TARGETS_TO_BUILD=ARM)

#executing...
project (arm_cross)
add_executable(hello hello.cpp )

我希望在调用make之后获得arm的可执行文件

Answer 1

我从未与docker打交道。但是半年前，我还遇到了在Mac OS上交叉编译树莓代码的问题。无论如何，我使用clang作为工具链，最后我成功了。

关键是为clang提供良好的目标rootfs。我只是通过sshfs挂载了真正的树莓。

另一件事是我没有将编译器设置放入CMakeLists.txt中，而是提供了带有工具链文件的cmake。

我的cmake工具链文件：

SET(CMAKE_SYSTEM_VERSION 1)
set(CMAKE_SYSTEM_NAME Linux)
set(CMAKE_SYSTEM_PROCESSOR arm)

# Custom toolchain-specific definitions for your project
set(PLATFORM_ARM "1")
set(PLATFORM_COMPILE_DEFS "COMPILE_GLES")

# There we go!
# Below, we specify toolchain itself!

SET(TARGET_TRIPLE arm-linux-gnueabihf)

# Specify your target rootfs mount point on your compiler host machine
SET(TARGET_ROOTFS /Volumes/rootfs-${TARGET_TRIPLE})

# Specify clang paths
SET(LLVM_DIR /Users/stepan/projects/shared/toolchains/llvm-7.0.darwin-release-x86_64/install)
SET(CLANG ${LLVM_DIR}/bin/clang)
SET(CLANGXX ${LLVM_DIR}/bin/clang++)

# Specify compiler (which is clang)
SET(CMAKE_C_COMPILER   ${CLANG})
SET(CMAKE_CXX_COMPILER ${CLANGXX})

# Specify binutils

SET (CMAKE_AR      "${LLVM_DIR}/bin/llvm-ar" CACHE FILEPATH "Archiver")
SET (CMAKE_LINKER  "${LLVM_DIR}/bin/llvm-ld" CACHE FILEPATH "Linker")
SET (CMAKE_NM      "${LLVM_DIR}/bin/llvm-nm" CACHE FILEPATH "NM")
SET (CMAKE_OBJDUMP "${LLVM_DIR}/bin/llvm-objdump" CACHE FILEPATH "Objdump")
SET (CMAKE_RANLIB  "${LLVM_DIR}/bin/llvm-ranlib" CACHE FILEPATH "ranlib")

# You may use legacy binutils though.
#SET(BINUTILS /usr/local/Cellar/arm-linux-gnueabihf-binutils/2.31.1)
#SET (CMAKE_AR      "${BINUTILS}/bin/${TARGET_TRIPLE}-ar" CACHE FILEPATH "Archiver")
#SET (CMAKE_LINKER  "${BINUTILS}/bin/${TARGET_TRIPLE}-ld" CACHE FILEPATH "Linker")
#SET (CMAKE_NM      "${BINUTILS}/bin/${TARGET_TRIPLE}-nm" CACHE FILEPATH "NM")
#SET (CMAKE_OBJDUMP "${BINUTILS}/bin/${TARGET_TRIPLE}-objdump" CACHE FILEPATH "Objdump")
#SET (CMAKE_RANLIB  "${BINUTILS}/bin/${TARGET_TRIPLE}-ranlib" CACHE FILEPATH "ranlib")

# Specify sysroot (almost same as rootfs)
SET(CMAKE_SYSROOT ${TARGET_ROOTFS})
SET(CMAKE_FIND_ROOT_PATH ${TARGET_ROOTFS})

# Specify lookup methods for cmake
set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)

# Sometimes you also need this:
# set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)

# Specify raspberry triple
set(CROSS_FLAGS "--target=${TARGET_TRIPLE}")

# Specify other raspberry related flags
set(RASP_FLAGS "-D__STDC_CONSTANT_MACROS -D__STDC_LIMIT_MACROS")

# Gather and distribute flags specified at prev steps.
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${CROSS_FLAGS} ${RASP_FLAGS}")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${CROSS_FLAGS} ${RASP_FLAGS}")

# Use clang linker. Why?
# Well, you may install custom arm-linux-gnueabihf binutils,
# but then, you also need to recompile clang, with customized triple;
# otherwise clang will try to use host 'ld' for linking,
# so... use clang linker.
set(CMAKE_EXE_LINKER_FLAGS ${CMAKE_EXE_LINKER_FLAGS} -fuse-ld=lld)

我的详细说明是here。

希望这会有所帮助。我还将这个问题分为两个步骤： 1.用clang编译它。 2.将编译设置集成到Docker。

祝你好运！

Answer 2

解决方案如下我所做的首先备份/ usr / include，然后将/ usr / arm / include文件上移。最后运行您的32位arm应用程序。可以通过简单的shell脚本自动执行此步骤。

如何使用clang获得标准库C ++进行交叉编译

2 个答案: