[liburing] create a new port

[luncliff]

What does your PR fix?

There was no port request for this library. But I think some Linux people are interested in it.

https://github.com/axboe/liburing (It requires kernel version 5.1+.)

Which triplets are supported/not supported? Have you updated the CI baseline?

Targets Linux triplets.

• x64-linux

Wish other contributors who use Linux with ARM processor can check this works for those triplets.
Seems like CC/CXX/BUILD_ARCH customization is required.

• arm-linux
• arm64-linux

Does your PR follow the maintainer guide?

Checked.

I saw Docker images target Linux Kernel 4.x in late 2019.
Considering to check the kernel version in the portfile and warn it.

[NancyLi1013]

Is there anything else that needs to be done for this PR @luncliff?

[luncliff]

Sorry for the pause, Nancy. I asked my friend for trying this, but not getting any feedback. I checked symbols with `nm` but not sure the port works correctly. Let me check some uring samples in GitHub in the upcoming weekend.

…

On Thu, May 13, 2021 at 11:27 AM NancyLi1013 ***@***.***> wrote: Is there anything else that needs to be done for this PR @luncliff <https://github.com/luncliff>? — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#17623 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ADLSYE6SNMNNEHZFKTTOX33TNM2JRANCNFSM437F3JPA> .

[luncliff]

I tested build/link of this port with both VCPKG_LIBRARY_LINKAGE static/dynamic.
Should be like below.

user@host:build-dbg$ ldd ./test_suite 
        linux-vdso.so.1 (0x00007fff1a14f000)
        liburing.so.2 => /.../vcpkg/installed/x64-linux/debug/lib/pkgconfig/../../lib/liburing.so.2 (0x00007ffbe4c1e000)
        libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007ffbe4be5000)
        libstdc++.so.6 => /lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007ffbe4a04000)
        libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007ffbe48b5000)
        libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007ffbe489a000)
        libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007ffbe46a8000)
        /lib64/ld-linux-x86-64.so.2 (0x00007ffbe4d7e000)

Plus, I added usage for CMake FindPkgConfig module.
There was no existing references for FindPkgConfig integration so I wrote it.
Any suggestion for it will be welcomed. :D

user@host:vcpkg$ ./vcpkg install liburing
...
Building package liburing[core]:x64-linux... done
Installing package liburing[core]:x64-linux...
Installing package liburing[core]:x64-linux... done
Elapsed time for package liburing:x64-linux: 8.618 s

Total elapsed time: 8.954 s

The package liburing can be imported via CMake FindPkgConfig module:

    include(FindPkgConfig)
    pkg_check_modules(URING liburing>=2.0)

    target_include_directories(main PRIVATE ${URING_INCLUDE_DIRS})
    target_link_libraries(main PRIVATE ${URING_LINK_LIBRARIES})

If you are using CMake v3.13 or higher:

    target_link_directories(main PRIVATE ${URING_LIBRARY_DIRS})

[JackBoosY]

Did you test the usage?

[luncliff]

@JackBoosY Yeap. with #17623 (comment)

[NancyLi1013]

LGTM now, thanks for your adding this new port @luncliff.

[strega-nil-ms]

@luncliff could you make the versions changes? I apparently can't push to your branch...

[luncliff]

@luncliff could you make the versions changes? I apparently can't push to your branch...

Of course! Thanks for the check and commit. :)
I will update the part and check import steps again.

[luncliff]

@strega-nil-ms please ping me when it's reviewed. :)