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Thread: Problem with libusb in macOS high Sierra

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    Default Problem with libusb in macOS high Sierra

    hi, I add libusb through "external library" and add the file libusb.h to the project folder and when I run one of the examples (listdevs.c) of this library I get the following problem. I understand it's a compatibility problem. Does anyone know how to fix this problem?

    ld: warning: ignoring file /Users/eduardo/My Cloud/Programas/dataMonitor 10 copy/libusb-1.0-2.22/MinGW64/static//libusb-1.0.a, file was built for archive which is not the architecture being linked (x86_64): /Users/eduardo/My Cloud/Programas/dataMonitor 10 copy/libusb-1.0-2.22/MinGW64/static//libusb-1.0.a
    Undefined symbols for architecture x86_64:
    "_libusb_get_bus_number", referenced from:
    configureGraph:rint_devs(libusb_device**) in configuregraph.o
    "_libusb_get_device_address", referenced from:
    configureGraph:rint_devs(libusb_device**) in configuregraph.o
    "_libusb_get_device_descriptor", referenced from:
    configureGraph:rint_devs(libusb_device**) in configuregraph.o
    "_libusb_get_port_numbers", referenced from:
    configureGraph:rint_devs(libusb_device**) in configuregraph.o
    ld: symbol(s) not found for architecture x86_64
    clang: error: linker command failed with exit code 1 (use -v to see invocation)
    make: *** [dataMonitor.app/Contents/MacOS/dataMonitor] Error 1
    22:35:33: The process "/usr/bin/make" exited with code 2.
    Error while building/deploying project dataMonitor (kit: Desktop Qt 5.11.1 clang 64bit)
    When executing step "Make"


    Does anyone know if there is a generic driver in macOS like the Microsoft winUSB for Qt?
    thanks for help me
    Last edited by Eduardo Huerta; 8th January 2019 at 05:38.

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    Default Re: Problem with libusb in macOS high Sierra

    Does anyone know how to fix this problem?
    You probably either need to get a 64-bit version of a compiled libusb-1.0.a or built it yourself from the source code using the same compiler tool chain you are using for your app.

    Changing to a different library won't help if it is built for the wrong architecture.
    <=== The Great Pumpkin says ===>
    Please use CODE tags when posting source code so it is more readable. Click "Go Advanced" and then the "#" icon to insert the tags. Paste your code between them.

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    Default Re: Problem with libusb in macOS high Sierra

    Compile the libusb source code with my program and show an error similar to the previous one.
    Thanks
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    Default Re: Problem with libusb in macOS high Sierra

    Are your libraries being linked into your executable in the correct order? Unlike Microsoft C++, linux linkers usually require libraries to be linked in order of dependence. That is, if library A requires symbols that are defined in library B, then library A must be listed first, followed by library B. If you have them listed in reverse order, then the symbols needed by library A will not be loaded from library B and you will get an undefined symbol error.
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    Default Re: Problem with libusb in macOS high Sierra

    Quote Originally Posted by Eduardo Huerta View Post
    Compile the libusb source code with my program and show an error similar to the previous one.
    Still looks like you have a library built for something other than 64-bit x86. Is the old one still present on your machine?

    Seems odd...I am no Mac person, but I did not think that there was such a beast as a 32-bit OS X... and therefore little call for non-64-bit libraries.

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