Using code compiled in OpenSUSE on a microcontroller running Gentoo Linux

This is a discussion on Using code compiled in OpenSUSE on a microcontroller running Gentoo Linux within the Linux Programming forums, part of the Platform Specific Boards category; I want to use code the I compiled on a desktop running OpenSUSE linux, and port it over to a ...

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    Using code compiled in OpenSUSE on a microcontroller running Gentoo Linux

    I want to use code the I compiled on a desktop running OpenSUSE linux, and port it over to a microcontroller running Gentoo Linux. The primary means of sending data between the desktop and the microcontroller is to remove the microcontroller's memory card and insert it into a usb card reader connected to my desktop.

    Through the USB card reader, I have access to all the files, including all root folder files, that are part of the microcontroller's linux operating system. I can essentially install any program, package, library or module to this operating system as if it were my desktop computer.

    The problem is the system discrepancy, if I do install any packages to the microcontroller memory, those packages will be compiled in a openSUSE operating system, but ultimately used by a Gentoo Linux operating system. I have no idea what kinds of problems this might cause.

    Any advice on how to approach this issue would be greatly appreciated.

    Thanks for the help.

  2. #2
    Frequently Quite Prolix dwks's Avatar
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    Can you take the source code and compile it on the Gentoo system? That would be the most straightforward way to do things.

    What are the kernel versions on the two systems? (Type uname -r.) Are they both running on 32-bit Intel CPUs, for example? If so, you could try it. There might be other issues, though, like incompatible versions of libc or something.

    You can tell GCC to target different platforms, assuming you have access to the source code. I don't know how, since I've never needed to.
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    Is the microcontroller an x86-based processor? Or something like ARM or MIPS?

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    I am using a PC104 stack for the microcontroller. Apparently they come in all kinds of configurations so I am not sure what processor architecture it is using. I will have to look it up or perhaps even disassemble the stack to get. Although the uppoermost chip on the stack is the firewire controller and that uses a 32-bit PCI bus, which leads me to assume the CPU module would also use a 32-bit chip.

    The Desktop uses an Intel Pentium 4, and is a 32-bit architecture. The Kernel is 2.6.18.8-0.5-default.

    The PC104 stack Kernel is 2.6.14-gentoo-r5.

    As far as compiling on a Gentoo system, I don't have access to any systems with it installed. I could install Gentoo on my desktop, but the operating system is a major project to set up, and it is nearly impossible for me to get any assistance in using it. Most people who I managed to contact for assistance with Gentoo Linux simple told me to install another version of Linux. Its emerge function is completely arcane and I have absolutely no understanding of it, yet that is what I need to get programs like gcc to work on it. So I would prefer not to have to deal with any more Gentoo Linux than I need to.
    Last edited by Phanixis; 10-17-2007 at 03:49 PM.

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    Emerge is anything but arcane. But this is not a place to advertise Gentoo.

    In fact, I rather think that Gentoo is a poor choice for such an inaccessible system as you're building. Why do you need Gentoo just to get GCC to work?
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    I don't need Gentoo to get gcc to work. I have gcc installed on OpenSUSE linux on the desktop, with a working copy of gcc and the program I compiled in gcc. I want to move said program to the microcontroller, which runs Gentoo Linux for no other reason than is what it came with.

    Now, the program is already a fully compiled stand alone application when I send it to the microcontroller. So I just send it over using the USB card reader and try to run it. However, the microcontroller claims it is missing libraries that it needs to run the program.

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    You could try adding -static on the gcc line that produces the final binary (e.g. gcc -o myprog myprog.o blah.o -lsomething -static).

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    Interesting, it is giving me a cannot find -lcxcore error when compiling. That is the same error I was getting when I attempted to run the program on the PC104. This might work(as soon as a find this lcxcore).

    Thanks for the help.

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    Well, -static means "link everything into the binary" or, put a different way, "don't use shared libraries". Of course, if "libcxcore.a" doesn't exist, then you can't link against it....

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    Apparantly, cxcore is part of openCV. There are several files named cxcore on my machine, but none name libcxcore. Either my install of openCV is incomplete or the make file is not properly obtaining the files.

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    Quote Originally Posted by Phanixis View Post
    Apparantly, cxcore is part of openCV. There are several files named cxcore on my machine, but none name libcxcore. Either my install of openCV is incomplete or the make file is not properly obtaining the files.
    You probably need to install somethng like OpenCV-devel or such.

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    That might be the case. My makefile is currently searching for the necessary files in a strange filepath that currently doesn't exist on my machine:

    /usr/lib/gcc/i586-suse-linux/4.1.2/../../../../i586-suse-linux/bin/ld: cannot find -lcxcore

    Mind you, I have no idea why it is searching that particular path, the line in make that produces this error is:

    -g++ -o (all my .o files) -lcxcore

    And nowhere in the make file do I tell it to look up the above filepath. The one I provided make with is "/usr/local/include/opencv". I have no idea were the program got the idea to search that rather long filepath for cxcore.

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    Captain Crash brewbuck's Avatar
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    Quote Originally Posted by Phanixis View Post
    /usr/lib/gcc/i586-suse-linux/4.1.2/../../../../i586-suse-linux/bin/ld: cannot find -lcxcore

    Mind you, I have no idea why it is searching that particular path
    You have a version-specific installation of binutils. Not typical, but nothing wrong with it, either. It's not looking for a library there. That's where the "ld" binary is -- read the message more closely.

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    Ok, I found out that when I statically compile the code, I apparently need to statically compile all the libraries it is using. I statically compiled the openCV libraries on my computer and reinstalled them, and I was able to get rid of the errors. Problem is that now it is telling me it can't find various gtk functions on compiling, which means I might have to statically recompile that as well.

    Thanks for the help. Hopefully I will get this to work eventually.

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    Quote Originally Posted by Phanixis View Post
    Ok, I found out that when I statically compile the code, I apparently need to statically compile all the libraries it is using.
    That shouldn't be the case... Can you give any more details on what you've tried? Recompiling GTK is going to really suck.

    EDIT: Do you mean "link it statically?" In that case, yes, all the libraries need to be static, but I would strongly recommend against linking it statically in the first place. If you can't dynamically link with cxcore, that's a separate issue we should investigate.

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