cross compiling causes library conflicts

asked 2017-10-31 07:48:39 -0600

Tosch gravatar image

Hi all!

I'm a total ROS beginner and want to compile a tutorial sample for an aarch64 target. Compiling the sample for x86_64 is working fine. In the ROS wiki I found how to start with a cross compiling project. So I created a rostoolchain.cmake like


set(CMAKE_C_COMPILER /usr/bin/aarch64-linux-gnu-gcc)
set(CMAKE_CXX_COMPILER /usr/bin/aarch64-linux-gnu-g++)
set(CMAKE_FIND_ROOT_PATH /opt/ros/kinetic /usr/aarch64-linux-gnu)


set(CMAKE_LIBRARY_PATH /usr/lib/aarch64-linux-gnu /usr/aarch64-linux-gnu/lib)
set(CMAKE_IGNORE_PATH /usr/lib/x86_64-linux-gnu/ /usr/lib/x86_64-linux-gnu/lib/)

Starting compilation first creates a warning:

CMake Warning at rostest/CMakeLists.txt:45 (add_executable):
Cannot generate a safe runtime search path for target talker because files
in some directories may conflict with libraries in implicit directories:
runtime library [] in /usr/aarch64-linux-gnu/lib may be hidden by files in:
Some of these libraries may not be found correctly.

A little bit later I get an error:

/usr/lib/x86_64-linux-gnu/ error adding symbols: File in wrong format

Obviously the aarch64 library file cannot be found although it is available. It seems that the linker is always trying to link the standard x86_64 library even if the CMAKE_IGNORE_PATH is set. Can anyone tell me how to exclude the standard library?

Any help is appreciated. Thanks.

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If you are -accidentally- seeing wrong libs, maybe you didn't configure your cross-compiling environment correctly. What I'm trying to say is, having all libs for different architectures in the same environment isn't the best practice. I'd suggest using docker or maybe a chroot environment that doesn't have access to your 64bit libs. These ways can save you a lot of time in the future.

Orhan gravatar image Orhan  ( 2019-10-17 16:47:32 -0600 )edit