Example project for cross-compilation and C++ development for Raspberry Pi
Home Page: https://tttapa.github.io/Pages/Raspberry-Pi/C++-Development-RPiOS/index.html
Example project for cross-compilation and C++ development for Raspberry Pi.
Full user guide: Ubuntu to Raspberry Pi OS Cross C++ Development
Toolchains: tttapa/docker-arm-cross-toolchain
Hi !
Thanks a lot for your work, it helped me a lot to finally get into cross compile world.
I need to add a library (GLog) into my project but I'm struggling to make it work.
In the CMakeLists.txt of Glog, I added :
# Cross-compilation system information
set(CMAKE_SYSTEM_NAME Linux)
set(CMAKE_SYSTEM_PROCESSOR arm)
# The sysroot contains all the libraries we might need to link against and
# possibly headers we need for compilation
set(CMAKE_SYSROOT /var/lib/schroot/chroots/schroot-name-armhf)
set(CMAKE_FIND_ROOT_PATH ${CMAKE_SYSROOT})
set(CMAKE_LIBRARY_ARCHITECTURE arm-linux-gnueabihf)
set(CMAKE_STAGING_PREFIX $ENV{HOME}/RPi-dev/staging-armv6-rpi)
# Set the compilers for C, C++ and Fortran
set(RPI_GCC_TRIPLE "armv6-rpi-linux-gnueabihf")
set(CMAKE_C_COMPILER ${RPI_GCC_TRIPLE}-gcc CACHE FILEPATH "C compiler")
set(CMAKE_CXX_COMPILER ${RPI_GCC_TRIPLE}-g++ CACHE FILEPATH "C++ compiler")
set(CMAKE_Fortran_COMPILER ${RPI_GCC_TRIPLE}-gfortran CACHE FILEPATH "Fortran compiler")
# Set the architecture-specific compiler flags
set(ARCH_FLAGS "-mcpu=arm1176jzf-s")
set(CMAKE_C_FLAGS_INIT ${ARCH_FLAGS})
set(CMAKE_CXX_FLAGS_INIT ${ARCH_FLAGS})
set(CMAKE_Fortran_FLAGS_INIT ${ARCH_FLAGS})
# Don't look for programs in the sysroot (these are ARM programs, they won't run
# on the build machine)
set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
# Only look for libraries, headers and packages in the sysroot, don't look on
# the build machine
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(CPACK_DEBIAN_PACKAGE_ARCHITECTURE armhf)It got Build without any error, but when I add just a little 'find_package (glog REQUIRED)' in the CMakeLists.txt of my Project, I get:
CMake Error at CMakeLists.txt:11 (find_package):By not providing "Findglog.cmake" in CMAKE_MODULE_PATH this project has
asked CMake to find a package configuration file provided by "glog", but
CMake did not find one.
Could not find a package configuration file provided by "glog" with any of
the following names:
glogConfig.cmake
glog-config.cmake
Add the installation prefix of "glog" to CMAKE_PREFIX_PATH or set
"glog_DIR" to a directory containing one of the above files. If "glog"
provides a separate development package or SDK, be sure it has been
installed.
Any clue ?
Best regards
Hi!
I want to include within my project a ZMQ messaging library. There is a base library available (libzmq3-dev) in apt, but it requires a wrapper around it (cppzmq - https://github.com/zeromq/cppzmq). How can I build and install this library in the chroot?
I used Your guide to create a cross-compiling environment to cross-compile to my RPi 4B. My project requires threads. I've added following lines to my CMakeLists.txt file:
set(CMAKE_THREAD_PREFER_PTHREAD TRUE)
set(THREADS_PREFER_PTHREAD_FLAG TRUE)
find_package(Threads REQUIRED)
target_link_libraries(projectRobot PiPCA9685 zmq Threads::Threads)
While configuring the project, CMake spits out an error, that it can't find the Threads package
-- Check if compiler accepts -pthread
-- Check if compiler accepts -pthread - no
-- Looking for pthread_create in pthreads
-- Looking for pthread_create in pthreads - not found
-- Looking for pthread_create in pthread
-- Looking for pthread_create in pthread - not found
CMake Error at /snap/clion/222/bin/cmake/linux/x64/share/cmake-3.24/Modules/FindPackageHandleStandardArgs.cmake:230 (message):
Could NOT find Threads (missing: Threads_FOUND)
Call Stack (most recent call first):
/snap/clion/222/bin/cmake/linux/x64/share/cmake-3.24/Modules/FindPackageHandleStandardArgs.cmake:594 (_FPHSA_FAILURE_MESSAGE)
/snap/clion/222/bin/cmake/linux/x64/share/cmake-3.24/Modules/FindThreads.cmake:230 (FIND_PACKAGE_HANDLE_STANDARD_ARGS)
CMakeLists.txt:16 (find_package)
-- Configuring incomplete, errors occurred!
I'm using an armv8 toolchain file that looks as follows
# https://cmake.org/cmake/help/book/mastering-cmake/chapter/Cross%20Compiling%20With%20CMake.html
# Cross-compilation system information
set(CMAKE_SYSTEM_NAME Linux)
set(CMAKE_SYSTEM_PROCESSOR arm)
# The sysroot contains all the libraries we might need to link against and
# possibly headers we need for compilation
set(CMAKE_SYSROOT /var/lib/schroot/chroots/rpizero-bullseye-armhf)
set(CMAKE_FIND_ROOT_PATH ${CMAKE_SYSROOT})
set(CMAKE_LIBRARY_ARCHITECTURE arm-linux-gnueabihf)
set(CMAKE_STAGING_PREFIX $ENV{HOME}/RPi-dev/staging-armv8-rpi)
# Set the compilers for C, C++ and Fortran
set(RPI_GCC_TRIPLE "armv8-rpi3-linux-gnueabihf")
set(CMAKE_C_COMPILER ${RPI_GCC_TRIPLE}-gcc CACHE FILEPATH "C compiler")
set(CMAKE_CXX_COMPILER ${RPI_GCC_TRIPLE}-g++ CACHE FILEPATH "C++ compiler")
set(CMAKE_Fortran_COMPILER ${RPI_GCC_TRIPLE}-gfortran CACHE FILEPATH "Fortran compiler")
# Set the architecture-specific compiler flags
set(ARCH_FLAGS "-mcpu=arm1176jzf-s")
set(CMAKE_C_FLAGS_INIT ${ARCH_FLAGS})
set(CMAKE_CXX_FLAGS_INIT ${ARCH_FLAGS})
set(CMAKE_Fortran_FLAGS_INIT ${ARCH_FLAGS})
# Don't look for programs in the sysroot (these are ARM programs, they won't run
# on the build machine)
set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
# Only look for libraries, headers and packages in the sysroot, don't look on
# the build machine
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(CPACK_DEBIAN_PACKAGE_ARCHITECTURE armhf)
Looking around in rootfs of rpizero-bullseye-armhf I can see that pthread lib is available at /var/lib/schroot/chroots/rpizero-bullseye-armhf/lib/arm-linux-gnueabihf
rwxr-xr-x 1 root root 137364 mar 30 2022 libpthread-2.31.so
-rw-r--r-- 1 root root 2383710 mar 30 2022 libpthread.a
lrwxrwxrwx 1 root root 40 mar 30 2022 libpthread.so -> /lib/arm-linux-gnueabihf/libpthread.so.0
lrwxrwxrwx 1 root root 18 mar 30 2022 libpthread.so.0 -> libpthread-2.31.so
Reinstalling the package libpthread-stubs0-dev with sudo sbuild-apt rpizero-bullseye-armhf apt-get reinstall libpthread-stubs0-dev brings no effect.
Is there a way for CMake to detect the Threads library?
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