On 7/19/21 6:17 AM, andre.nahrw...@dlr.de wrote: > Hello, > > I have built RTEMS 5 and its tools for the Xilinx Zynq Zedboard and installed > the BSP and tools at a certain position on my machine. > The tools are added to the PATH variable and RTEMS_BSPS is also available in > the environment. > > Now we need to build a library for the use with RTEMS via CMake. > For this we wanted to use the toolchain files. > Does anybody know how to correctly setup such a toolchain file using the > RTEMS compiler? > > We managed to get a toolchain file working which at least built the library. > But when we wanted to link to this library during compilation of a RTEMS > application we got a bunch of errors due to undefined references to standard > library functions. > Does anybody has a clue where this might origin from?
As it happens, I went through this exercise recently with libevent. The main obstacle for me was that the CMake try_compile() command actually tries to link an executable. With RTEMS 5 this can't be done generically without also adding '-lrtemsdefaultconfig'. eg. > string(APPEND CMAKE_EXE_LINKER_FLAGS_INIT " -lrtemsdefaultconfig") Also, if you use networking you might want to add. > set(CMAKE_REQUIRED_LIBRARIES "-lbsd") for eg. CheckFunctionExists.cmake to work correctly. The (fairly complex) result of this all can be found here: https://github.com/mdavidsaver/pvxs/tree/master/bundle The essential parts are: - cmake/RTEMS.cmake@ Template toolchain file. (expand using definitions from RTEMS makefiles) - cmake/Platform/ Hooks into the CMake startup process. The exact interplay between Platform/ and toolchain file is... quite involved. Also not well documented. The best I've found is: https://github.com/Kitware/CMake/blob/f86d8009c6a4482c81221114a2b04b375564cc94/Source/cmGlobalGenerator.cxx#L461-L504 > Building a RTEMS application which does not use the own library works fine. > > Our toolchain file looks like this: > > # CMake toolchain file for ARM > # The compiler is based on > # The RTEMS_BSPS environment variable is expected to be set. > set(ARCH arm) > set(CMAKE_SYSTEM_NAME RTEMS5) > > set(CMAKE_CXX_FLAGS "" CACHE STRING "ARM RTEMS5 gcc additional compiler > flags" FORCE) > > set(RTEMS_TOOLS_PATH $ENV{RTEMS_BSPS}/../../tools/bin) > > set(CMAKE_C_COMPILER ${RTEMS_TOOLS_PATH}/arm-rtems5-gcc CACHE PATH "ARM > RTEMS5 gcc" FORCE) > set(CMAKE_CXX_COMPILER ${RTEMS_TOOLS_PATH}/arm-rtems5-gcc CACHE PATH "ARM > RTEMS5 gcc" FORCE) > set(CMAKE_CXX_COMPILER_AR ${RTEMS_TOOLS_PATH}/arm-rtems5-gcc-ar CACHE PATH > "ARM RTEMS5 ar" FORCE) > set(CMAKE_CXX_COMPILER_RANLIB ${RTEMS_TOOLS_PATH}/arm-rtems5-gcc-ranlib CACHE > PATH "ARM RTEMS5 gcc ranlib" FORCE) > set(CMAKE_RANLIB ${RTEMS_TOOLS_PATH}/arm-rtems5-ranlib CACHE PATH "ARM RTEMS5 > ranlib" FORCE) > set(CMAKE_READELF ${RTEMS_TOOLS_PATH}/arm-rtems5-readelf CACHE PATH "ARM > RTEMS5 readelf" FORCE) > set(CMAKE_STRIP ${RTEMS_TOOLS_PATH}/arm-rtems5-strip CACHE PATH "ARM RTEMS5 > strip" FORCE) > set(CMAKE_ADDR2LINE ${RTEMS_TOOLS_PATH}/arm-rtems5-addr2line CACHE PATH "ARM > RTEMS5 addr2line" FORCE) > set(CMAKE_LINKER ${RTEMS_TOOLS_PATH}/arm-rtems5-ld CACHE PATH "ARM RTEMS5 ld" > FORCE) > set(CMAKE_NM ${RTEMS_TOOLS_PATH}/arm-rtems5-nm CACHE PATH "ARM RTEMS5 nm" > FORCE) > set(CMAKE_OBJCOPY ${RTEMS_TOOLS_PATH}/arm-rtems5-objcopy CACHE PATH "ARM > RTEMS5 objcopy" FORCE) > set(CMAKE_OBJDUMP ${RTEMS_TOOLS_PATH}/arm-rtems5-objdump CACHE PATH "ARM > RTEMS5 objdump" FORCE) > > set(CMAKE_TARGET_CONFIG_POSTFIX .rtems5_gcc_arm) > > Best regards > Andre Nahrwold > -------------------------- > Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR) > German Aerospace Center > Institute for Software Technolog | SRV-OSS BS | Lilienthalpl. 7 | 38108 > Braunschweig | Geb. 112C Raum 001 > M.Sc. Andre Nahrwold | Telephone +49 531 295-3834 | andre.nahrw...@dlr.de > DLR.de > > _______________________________________________ > users mailing list > users@rtems.org > http://lists.rtems.org/mailman/listinfo/users > _______________________________________________ users mailing list users@rtems.org http://lists.rtems.org/mailman/listinfo/users
