我的源代码树是
cpp
├── bin
├── CMakeLists.txt
├── src
├── headers
├── Makefile
├── TestConfig.h
├── TestConfig.h.in
├── README.txt
├── third_party
├── x_build
└── xtoolchain.cmake
我正在使用crosstool-ng。
编辑：其他信息（可能对其他人有帮助）：我使用http://xecdesign.com/qemu-emulating-raspberry-pi-the-easy-way/的引用通过QEMU引导RPI（重要的是将img文件的大小调整为8GB）。
qemu-img resize 2014-01-07-wheezy-raspbian.img +6G
sudo fdisk /dev/mmcblk0
- use "parted" or 'd' options to delete the 2nd partition and then recreate it but with a larger size. (don't worry, the data will remain). 1st partition is vfat.
- reboot to activate the partition changes.
- use "sudo resize2fs /dev/mmclk0p2" (or /dev/sda2 if symlink set in udev rules) to enlarge the root file system.
- use e2fsck -f /dev/mmcblk0p2 to perform a file system check.
使用lib<package>-dev安装了所有apt-get和其他库。然后关闭QEMU
mkdir -p /tmp/rasp
sudo mount /home/test/raspberrypi/2014-01-07-wheezy-raspbian.img /tmp/rasp/ -o offset=$((122880*512))
cd $HOME/raspberrypi
sudo cp -ar /tmp/rasp ./rootfs
sudo chown -R $USER:$USER rootfs/home/pi
cd $HOME/raspberrypi/rootfs
# also small hack around: error "Never use <bits/predefs.h> directly; include <stdc-predef.h> instead."
sudo cp /home/test/raspberrypi/rootfs/usr/include/features.h /home/test/raspberrypi/rootfs/usr/include/features.h-
sudo cp /home/test/local/x-tools/arm-unknown-linux-gnueabi/arm-unknown-linux-gnueabi/sysroot/usr/include/features.h /home/test/raspberrypi/rootfs/usr/include
sudo umount /tmp/rasp
我还设置了目标文件系统/home/test/raspberrypi/rootfs（这包含已经安装的交叉编译所需的所有库）
xtoolchain.cmake如下所示
# ========================= CROSS COMPILATION INITIALIZATION BEGIN =======================
# this one is important
SET(CMAKE_SYSTEM_NAME Linux)
#this one not so much
SET(CMAKE_SYSTEM_VERSION 1)
# specify the cross compiler
SET(CMAKE_C_COMPILER
$ENV{HOME}/local/x-tools/arm-unknown-linux-gnueabi/bin/arm-unknown-linux-gnueabi-gcc)
SET(CMAKE_CXX_COMPILER
$ENV{HOME}/local/x-tools/arm-unknown-linux-gnueabi/bin/arm-unknown-linux-gnueabi-g++)
# where is the target environment
#SET(CMAKE_FIND_ROOT_PATH
#/home/test/local/x-tools/arm-unknown-linux-gnueabi /home/test/raspberrypi/rootfs)
SET(CMAKE_FIND_ROOT_PATH $ENV{HOME}/raspberrypi/rootfs)
# search for programs in the build host directories
SET(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
# for libraries and headers in the target directories
SET(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
SET(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
#include_directories ("/home/test/local/raspidev/include")
# ========================= CROSS COMPILATION INITIALIZATION END =========================
CMakeLists.txt（这是在父目录中的CMakeLists.txt，你可以从文件结构中看到）src目录中的部分看起来像
cmake_minimum_required(VERSION 2.8)
...
...
...
#Change 1 to 0 to disable logging
add_definitions(-DENABLE_LOG=1)
set(CMAKE_PREFIX_PATH $ENV{HOME}/raspberrypi/rootfs/)
set(CMAKE_LIBRARY_PATH $ENV{HOME}/raspberrypi/rootfs/lib:$ENV{HOME}/raspberrypi/rootfs/usr/lib:$ENV{HOME}/raspberrypi/rootfs/usr/local/lib)
set(CMAKE_MODULE_PATH $ENV{HOME}/raspberrypi/rootfs/usr/share/cmake-2.8/Modules)
#rdynamic is for stack unwinding on crash
set(CMAKE_CXX_FLAGS "-W -O3 -g -Wall -std=c++0x -rdynamic -D_AIBTRACE ${CMAKE_CXX_FLAGS}")
set_target_properties(${TARGET} PROPERTIES COMPILE_FLAGS ${CMAKE_CXX_FLAGS})
include_directories ("${PROJECT_SOURCE_DIR}/headers")
#add_subdirectory (headers)
...
...
...
# ======================== SQLITE3 =================================
pkg_check_modules(SQLITE3 REQUIRED sqlite3)
include_directories(${SQLITE3_INCLUDE_DIRS})
...
... (...And other libraries)
我在x_build目录中进行了源代码构建。如下
cmake -DCMAKE_TOOLCHAIN_FILE=/home/test/xcompile/cpp/xtoolchain.cmake ../
奇怪的是，它似乎是与主机库相关联而不是目标库。 make VERBOSE=1显示了这个
它会引发所有库的链接器错误（这些库肯定存在于目标系统rootfs上）
/home/test/local/x-tools/arm-unknown-linux-gnueabi/lib/gcc/arm-unknown-linux-gnueabi/4.7.3/../../../../arm-unknown-linux-gnueabi/bin/ld: cannot find -lgmodule-2.0
/home/test/local/x-tools/arm-unknown-linux-gnueabi/lib/gcc/arm-unknown-linux-gnueabi/4.7.3/../../../../arm-unknown-linux-gnueabi/bin/ld: cannot find -lgthread-2.0
/home/test/local/x-tools/arm-unknown-linux-gnueabi/lib/gcc/arm-unknown-linux-gnueabi/4.7.3/../../../../arm-unknown-linux-gnueabi/bin/ld: cannot find -lxml2
/home/test/local/x-tools/arm-unknown-linux-gnueabi/lib/gcc/arm-unknown-linux-gnueabi/4.7.3/../../../../arm-unknown-linux-gnueabi/bin/ld: cannot find -lglib-2.0
/home/test/local/x-tools/arm-unknown-linux-gnueabi/lib/gcc/arm-unknown-linux-gnueabi/4.7.3/../../../../arm-unknown-linux-gnueabi/bin/ld: cannot find -lsqlite3
/home/test/local/x-tools/arm-unknown-linux-gnueabi/lib/gcc/arm-unknown-linux-gnueabi/4.7.3/../../../../arm-unknown-linux-gnueabi/bin/ld: cannot find -ldbus-1
collect2: error: ld returned 1 exit status
我有点失落。
编辑：
根据CMakeLists.txt
set (SOURCES
file1.cc
file2.cc
main.cc
)
# Similarly, why not concise files grouping that will be reused ;)?
set (COMMONS_LIBS
${OpenCV_LIBS}
pthread
${GLIBMM_LIBRARIES}
${GTKMM_LIBRARIES}
#${GSTMM_LIBRARIES}
${GSTREAMER_LIBRARIES}
${SQLITE3_LIBRARIES}
#${DBUS_GLIB_LIBRARY}
${DBUS_LIBRARIES}
${DBUS_GLIB_LIBRARIES}
${OPENSSL_LIBRARIES}
)
add_executable (
${EXE_DAEMON}
${SOURCES}
)
target_link_libraries(
${EXE_DAEMON}
$COMMONS_LIBS}
)
install (TARGETS
${EXE_DAEMON}
DESTINATION bin)
答案 0 :(得分：2)
我在CMakeLists.txt中添加了以下内容，然后在下面进行了一些更改并使其正常工作！
include($ENV{HOME}/raspberrypi/rootfs/usr/share/cmake-2.8/Modules/FindPkgConfig.cmake)
set(CMAKE_PREFIX_PATH $ENV{HOME}/raspberrypi/rootfs/)
set(SYSROOT $ENV{HOME}/raspberrypi/rootfs/)
set (PKG_CONFIG_SYSROOT_DIR ${SYSROOT})
set(PKG_CONFIG_PATH ${SYSROOT}/usr/lib/pkgconfig:${SYSROOT}/usr/local/lib/pkgconfig:${SYSROOT}/usr/lib/arm-linux-gnueabihf/pkgconfig:${SYSROOT}/usr/share/pkgconfig)
#Change 1 to 0 to disable logging
add_definitions(-DENABLE_LOG=1)
find_program(PKG_CONFIG_EXECUTABLE NAMES pkg-config PATHS /usr/bin DOC "pkg-config executable" NO_CMAKE_FIND_ROOT_PATH)
set (CMAKE_CXX_FLAGS "-W -O3 -g -Wall -std=c++0x -rdynamic -D_TRACE ${CMAKE_CXX_FLAGS}" CACHE STRING "" FORCE)
#rdynamic is for stack unwinding on crash
set(CMAKE_PREFIX_PATH $ENV{HOME}/raspberrypi/rootfs/)
set(CMAKE_LIBRARY_PATH $ENV{HOME}/raspberrypi/rootfs/lib:$ENV{HOME}/raspberrypi/rootfs/usr/lib:$ENV{HOME}/raspberrypi/rootfs/usr/local/lib)
set(CMAKE_MODULE_PATH $ENV{HOME}/raspberrypi/rootfs/usr/share/cmake-2.8/Modules)
include_directories(SYSTEM
$ENV{HOME}/raspberrypi/rootfs/usr/include/arm-linux-gnueabihf
$ENV{HOME}/raspberrypi/rootfs/usr/include
$ENV{HOME}/raspberrypi/rootfs/usr/local/include
)
add_definitions(
-march=armv6zk
-mfpu=vfp
-mfloat-abi=hard
)
link_directories(
$ENV{HOME}/raspberrypi/rootfs/lib/arm-linux-gnueabihf
$ENV{HOME}/raspberrypi/rootfs/lib
$ENV{HOME}/raspberrypi/rootfs/usr/lib/arm-linux-gnueabihf
$ENV{HOME}/raspberrypi/rootfs/usr/lib
$ENV{HOME}/raspberrypi/rootfs/usr/local/lib
)
set_target_properties(${TARGET} PROPERTIES COMPILE_FLAGS ${CMAKE_CXX_FLAGS})
然后做了以下
sudo vim /home/test/raspberrypi/rootfs/usr/lib/arm-linux-gnueabihf/libpthread.so
编辑
OUTPUT_FORMAT(elf32-littlearm)
GROUP ( /lib/arm-linux-gnueabihf/libpthread.so.0 /usr/lib/arm-linux-gnueabihf/libpthread_nonshared.a )
到
OUTPUT_FORMAT(elf32-littlearm)
GROUP ( libpthread.so.0 libpthread_nonshared.a )
类似地，
sudo vim /home/test/raspberrypi/rootfs/usr/lib/arm-linux-gnueabihf/libc.so
编辑
OUTPUT_FORMAT(elf32-littlearm)
GROUP ( /lib/arm-linux-gnueabihf/libc.so.6 /usr/lib/arm-linux-gnueabihf/libc_nonshared.a AS_NEEDED ( /lib/arm-linux-gnueabihf/ld-linux-armhf.so.3 ) )
到
OUTPUT_FORMAT(elf32-littlearm)
GROUP ( libc.so.6 libc_nonshared.a AS_NEEDED ( ld-linux-armhf.so.3 ) )
最后，我将-lpcre库添加到了COMMON_LIBS
编译成功。然后我通过QEMU启动了raspberrypi并使用scp scp daemon pi@<ip address>:~将生成的二进制文件传输到PI模拟器并运行它。 Tadaa！它工作正常！