[CMake] Cmake : undefined reference to `udev_device_get_devnode'

[Nikita Barawade]

Hi Nils,


Got It !


As per your suggestion, linked libudev to LLAPI target and rebuilt both LLAPI lib and App . No errors now .

Thank you !


/Cmake/LLAPI/build$ ldd Source/libLLAPI.so
    linux-vdso.so.1 =>  (0x00007ffccff9c000)
    libudev.so.1 => /lib/x86_64-linux-gnu/libudev.so.1 (0x00007fb8d2235000)
    librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007fb8d202d000)
    libstdc++.so.6 => /usr/lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007fb8d1d29000)
    libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007fb8d1b13000)
    libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007fb8d174e000)
    libcgmanager.so.0 => /lib/x86_64-linux-gnu/libcgmanager.so.0 (0x00007fb8d1533000)
    libnih.so.1 => /lib/x86_64-linux-gnu/libnih.so.1 (0x00007fb8d131b000)
    libnih-dbus.so.1 => /lib/x86_64-linux-gnu/libnih-dbus.so.1 (0x00007fb8d1111000)
    libdbus-1.so.3 => /lib/x86_64-linux-gnu/libdbus-1.so.3 (0x00007fb8d0ecc000)
    /lib64/ld-linux-x86-64.so.2 (0x00007fb8d2b6f000)
    libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007fb8d0cae000)
    libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007fb8d09a8000)



Regards,
Nikita Barawade
Engineer | PES



________________________________
From: Nils Gladitz <nilsgladitz at gmail.com>
Sent: 20 November 2015 06:34 PM
To: Nikita Barawade; cmake at cmake.org
Subject: Re: [CMake] Cmake : undefined reference to `udev_device_get_devnode'

On 11/20/2015 01:39 PM, Nikita Barawade wrote:

../../../LLAPI/build/Source/libLLAPI.so: undefined reference to `udev_device_get_devnode'


Before this, while building a library libLLAPI.so I got error " fatal error: libudev.h: No such file or directory" .

It worked fine after installing libudev-dev .


These errors indicate that libLLAPI.so uses function from libudev but probably does not actually link to the library.
Assuming it is missing you will need an appropriate target_link_libraries() call for your LLAPI target so that it links to libudev.

Nils
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