Building on Gentoo linux about gyroflow

[siefkenj]

Yes, I tried the prebuilt package. I ended up installing xwayland and after that, the gyroflow starts!

[AdrianEddy]

Looks like your c++/clang is too old? I don't think it has anything to do with Qt version. Also, it says 6.5.3 in the path?
You shouldn't run cargo run, you should use just run

[siefkenj]

just run does the same thing as cargo run on linux, at least if I understand the just script properly. c++ is currently set to gcc-12.3. If I manually switch out all the references to 6.5.3 for 6.7.0, the failing command builds fine, so I don't think its an outdated toolchain issue.

I have no v6.5.3 installed on my system, so I don't know where it's pulling that number from...

[AdrianEddy]

just run is not the same as cargo run, the most important thing that it does is to set environment variables to point to correct dependencies versions (Qt, ffmpeg, OpenCV, mdk-sdk)

6.5.3 is nowhere in the sources, so it must be the qmake in your PATH that causes it. Make sure you run just run or set PATH properly

[siefkenj]

I have also been running just run with the same effect. Can you show me where just configures the env vars? I only see

[no-cd]
run *param:
    cargo run --release -- {{param}}

in _scripts/linux.just. Maybe if I can get at the configured variables, I can figure out who is missetting them...I also don't have a qmake on my system...

[AdrianEddy]

common.just is included at the beginning which sets all the variables first, it's a very important step
did you run just install-deps?

[siefkenj]

I am not on a debian-based system, so just install-deps won't work for me (no apt-get). I have all the required libraries already installed on my system, though I am now running into trouble with OpenCV...

Executing

OPENCV_CMAKE_NAME=OpenCV OPENCV_CMAKE_BIN=`which cmake` LIBCLANG_PATH=/usr/lib/llvm/17/lib64/ just run

seems to have no effect on the builds ability to find OpenCV, though if I run

OPENCV_CMAKE_NAME=OpenCV OPENCV_CMAKE_BIN=`which cmake` LIBCLANG_PATH=/usr/lib/llvm/17/lib64/ cargo run --release

it finds OpenCV just fine, though I get a linking with cc failed: exit status 1 on a hugely long call to the linker.

[siefkenj]

I've made a little bit of progress. I installed OpenCV 4.8.0 via vcpkg into gyroflow/ext and now LIBCLANG_PATH=/usr/lib/llvm/17/lib64/ just run terminates with

/usr/lib/gcc/x86_64-pc-linux-gnu/12/../../../../x86_64-pc-linux-gnu/bin/ld: cannot find -lpng

which is strange because directly running

/usr/lib/gcc/x86_64-pc-linux-gnu/12/../../../../x86_64-pc-linux-gnu/bin/ld -lpng --verbose|grep libpng

shows attempt to open /lib64/libpng.so succeeded, which means that that version of ld is definitely capable of finding libpng.

[AdrianEddy]

it would be the easiest to just replace apt calls to your system package manager and leave everything else as is and use the just script. I takes care of all the proper environment variables, the Qt version, ffmpeg version and OpenCV version. (and none of these are debian-specific)

The apt calls are very minimal, just install these packages your way and leave everything else to the just script

[siefkenj]

I'm a bit confused...must of what is done in just install-deps seems to be Debian specific, and just install-deps should not leave any residual env vars set. So, given that I have all the packages installed that just install-deps would install, running just run should set up the env vars that you're talking about, right?

If you had the time to do a screen share, I could show you, and maybe you'd understand the issue.

[AdrianEddy]

I'm a bit confused...must of what is done in just install-deps seems to be Debian specific,

These are the only debian-specific lines:

    sudo apt-get install -y p7zip-full python3-pip clang libclang-dev bison pkg-config gperf curl unzip zip git
    sudo apt-get install -y libc++-dev libva-dev libvdpau-dev libvdpau1 mesa-va-drivers ocl-icd-opencl-dev opencl-headers
    sudo apt-get install -y libpulse-dev libasound-dev libxkbcommon-dev
    sudo apt-get install -y libfontconfig1 libfreetype6

Everything else is universal

and just install-deps should not leave any residual env vars set.

It doesn't, it installs all deps to the ext folder

So, given that I have all the packages installed that just install-deps would install, running just run should set up the env vars that you're talking about, right?

Yes, but they have to be in the ext folder, not on your system

[siefkenj]

I have followed your suggestion in a fresh clone of the repo. I commented out all the sudo apt-get lines in linux.just and ran just install-deps followed by just run. Since the build system could not find libclang.so, I had to set LIBCLANG_PATH, so the command I actually ran was:

LIBCLANG_PATH="/usr/lib/llvm/16/lib64" just run

I get an error when building gyroflow:

/usr/lib/gcc/x86_64-pc-linux-gnu/13/../../../../x86_64-pc-linux-gnu/bin/ld: cannot find -lpng

I have tried both GCC v12 and v13, as well as linking to libclang.so v16 and v17.

Any ideas why it might be failing to resolve libpng (which is installed on my system, as I showed before...)

[AdrianEddy]

install libpng for your system

[siefkenj]

install libpng for your system

Like I said, libpng is installed and recognized by ld.

/usr/lib/gcc/x86_64-pc-linux-gnu/13/../../../../x86_64-pc-linux-gnu/bin/ld -lpng --verbose|grep libpng
attempt to open /lib64/libpng.so succeeded
/lib64/libpng.so

[AdrianEddy]

but you have the shared binary installed (.so). You need the static library for libpng - the libpng.a file. On debian, these packages have the -dev suffix

[siefkenj]

Thank you! Installing with static-libs got past the -lpng error :-).

There's a new one now, though...

/usr/lib/gcc/x86_64-pc-linux-gnu/12/../../../../x86_64-pc-linux-gnu/bin/ld: /home/albert/downloads/gyroflow2/target/release/build/qml-video-rs-600d545abebb22ba/out/mdk-sdk/lib/amd64//libmdk.so: undefined reference to `std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >::append(char const*, unsigned long)'

I checked and libmdk.so.0 is in that folder.

[AdrianEddy]

this error indicates some mismatch in c++ standard library, possibly because of different clang versions used? Try cargo clean and just run again

[siefkenj]

cargo clean didn't help, but it turned out I needed to install Gentoo's sys-libs/libcxx. Now there's progress! I get the message

 warning: libwayland-client.so.0, needed by /home/albert/downloads/gyroflow2/target/release/build/qml-video-rs-600d545abebb22ba/out/mdk-sdk/lib/amd64//libmdk.so, not found 

The entire reason I am trying to build this package myself is because the AppImage fails due to me no having Wayland. Is there a way to build without wayland?

[AdrianEddy]

This looks like a warning, are you sure it's that message that's stopping your build? Wayland shouldn't required. Also, did you try the prebuilt .tar.gz package from the website?

[siefkenj]

I'm going to try to produce a Gentoo ebuild for gyrflow. Hopefully this thread can be useful to some others.

Do you think I should recreate the steps in the just install-deps steps, or can install-deps be made to separate out the apt-get commands from the others?

[AdrianEddy]

it'd be better to add an if to the debian specific lines and add gentoo-specific lines there