sudo apt install -y g++-arm-linux-gnueabihf
rustup target add armv7-unknown-linux-gnueabihf

cargo install cargo-rpm

cargo new aurora-rust-helloworld

cargo rpm init

[package]
name = "aurora-rust-helloworld"
version = "0.1.0"
authors = ["Shamil Yakupov <syakupov@croc.ru>"]
edition = "2018"
description = "Rust example for Aurora OS"
license = "MIT"

[target.armv7-unknown-linux-gnueabihf]
linker = "arm-linux-gnueabihf-gcc"

cargo rpm init
cargo rpm build -v --target=armv7-unknown-linux-gnueabihf

$ devel-su
Password:
# pkcon install-local ./aurora-rust-helloworld-0.1.0-1.armv7hl.rpm

Fatal error: nothing provides libc.so.6(GLIBC_2.32) needed by
aurora-rust-helloworld-0.1.0-1.armv7hl

$ ldd --version
ldd (GNU libc) 2.28

[target.armv7-unknown-linux-gnueabihf]
rustflags = ["-C", "link-args=-L lib"]
linker = "bin/armv7hl-meego-linux-gnueabi-ld"

cargo build --release --target=armv7-unknown-linux-gnueabihf

aurora-rust-helloworld/bin/armv7hl-meego-linux-gnueabi-ld: cannot find -lgcc_s
aurora-rust-helloworld/bin/armv7hl-meego-linux-gnueabi-ld: cannot find -lutil
aurora-rust-helloworld/bin/armv7hl-meego-linux-gnueabi-ld: cannot find -lrt
aurora-rust-helloworld/bin/armv7hl-meego-linux-gnueabi-ld: cannot find -lpthread
aurora-rust-helloworld/bin/armv7hl-meego-linux-gnueabi-ld: cannot find -lm
aurora-rust-helloworld/bin/armv7hl-meego-linux-gnueabi-ld: cannot find -ldl
aurora-rust-helloworld/bin/armv7hl-meego-linux-gnueabi-ld: cannot find -lc
aurora-rust-helloworld/bin/armv7hl-meego-linux-gnueabi-ld: cannot find -lutil

mkdir -p lib
scp nemo@192.168.2.15:/usr/lib/libgcc_s.so ./lib
scp nemo@192.168.2.15:/usr/lib/libutil.so ./lib
scp nemo@192.168.2.15:/usr/lib/librt.so ./lib
scp nemo@192.168.2.15:/usr/lib/libpthread.so ./lib
scp nemo@192.168.2.15:/usr/lib/libm.so ./lib
scp nemo@192.168.2.15:/usr/lib/libdl.so ./lib
scp nemo@192.168.2.15:/usr/lib/libc.so ./lib
scp nemo@192.168.2.15:/usr/lib/libutil.so ./lib

aurora-rust-helloworld/bin/armv7hl-meego-linux-gnueabi-ld: skipping incompatible /lib/libc.so.6 when searching for /lib/libc.so.6
aurora-rust-helloworld/bin/armv7hl-meego-linux-gnueabi-ld: cannot find /lib/libc.so.6
aurora-rust-helloworld/bin/armv7hl-meego-linux-gnueabi-ld: skipping incompatible /usr/lib/libc_nonshared.a when searching for /usr/lib/libc_nonshared.a
aurora-rust-helloworld/bin/armv7hl-meego-linux-gnueabi-ld: cannot find /usr/lib/libc_nonshared.a
aurora-rust-helloworld/bin/armv7hl-meego-linux-gnueabi-ld: cannot find /lib/ld-linux-armhf.so.3

scp nemo@192.168.2.15:/lib/libc.so.6 ./lib
scp nemo@192.168.2.15:/usr/lib/libc_nonshared.a ./lib
scp nemo@192.168.2.15:/lib/ld-linux-armhf.so.3 ./lib

/* GNU ld script
   Use the shared library, but some functions are only in
   the static library, so try that secondarily.  */
OUTPUT_FORMAT(elf32-littlearm)
GROUP ( libc.so.6 libc_nonshared.a  AS_NEEDED ( ld-linux-armhf.so.3 ) )

Desktop file
============
ERROR [/usr/share/applications/aurora-rust-helloworld.desktop] File is missing - cannot validate .desktop file
Paths
=====
WARNING [/usr/share/aurora-rust-helloworld] Directory not found
ERROR [/usr/share/applications/aurora-rust-helloworld.desktop] File not found
WARNING [/usr/share/icons/hicolor/86x86/apps/aurora-rust-helloworld.png] File not found
WARNING [/usr/share/icons/hicolor/108x108/apps/aurora-rust-helloworld.png] File not found
WARNING [/usr/share/icons/hicolor/128x128/apps/aurora-rust-helloworld.png] File not found
WARNING [/usr/share/icons/hicolor/172x172/apps/aurora-rust-helloworld.png] File not found
ERROR [/usr/share/icons/hicolor/[0-9x]{5,9}/apps/aurora-rust-helloworld.png] No icons found! RPM must contain at least one icon, see: https://community.omprussia.ru/doc/software_development/guidelines/rpm_requirements
Libraries
=========
ERROR [/usr/bin/aurora-rust-helloworld] Cannot link to shared library: libutil.so.1
Symbols
=======
ERROR [/usr/bin/aurora-rust-helloworld] Binary does not link to 9__libc_start_main@GLIBC_2.4.
Requires
========
ERROR [libutil.so.1] Cannot require shared library: 'libutil.so.1'

[Desktop Entry]
Type=Application
X-Nemo-Application-Type=silica-qt5
Icon=aurora-rust-helloworld
Exec=aurora-rust-helloworld
Name=Rust Hello-World

.PHONY: all clean install prepare release rpm
all:
  @cargo build --target=armv7-unknown-linux-gnueabihf
clean:
  @rm -rvf target
install:
  @scp ./target/armv7-unknown-linux-gnueabihf/release/aurora-rust-helloworld nemo@192.168.2.15:/home/nemo/
  @scp ./target/armv7-unknown-linux-gnueabihf/release/rpmbuild/RPMS/armv7hl/*.rpm nemo@192.168.2.15:/home/nemo/
prepare:
  @rustup target add armv7-unknown-linux-gnueabihf
  @cargo install cargo-rpm
release:
  @cargo build --release --target=armv7-unknown-linux-gnueabihf
rpm:
  @mkdir -p ./target/armv7-unknown-linux-gnueabihf/release/rpmbuild/SOURCES
  @cp -vf .rpm/aurora-rust-helloworld.desktop ./target/armv7-unknown-linux-gnueabihf/release/rpmbuild/SOURCES
  @cp -rvf .rpm/icons ./target/armv7-unknown-linux-gnueabihf/release/rpmbuild/SOURCES
  @cargo rpm build -v --target=armv7-unknown-linux-gnueabihf

%define __spec_install_post %{nil}
%define __os_install_post %{_dbpath}/brp-compress
%define debug_package %{nil}
Name: aurora-rust-helloworld
Summary: Rust example for Aurora OS
Version: @@VERSION@@
Release: @@RELEASE@@%{?dist}
License: MIT
Group: Applications/System
Source0: %{name}-%{version}.tar.gz
Source1: %{name}.desktop
Source2: icons
BuildRoot: %{_tmppath}/%{name}-%{version}-%{release}-root
%description
%{summary}
%prep
%setup -q
%install
rm -rf %{buildroot}
mkdir -p %{buildroot}
cp -a * %{buildroot}
mkdir -p %{buildroot}%{_datadir}/applications
cp -a %{SOURCE1} %{buildroot}%{_datadir}/applications
mkdir -p %{buildroot}%{_datadir}/icons/hicolor/86x86/apps
mkdir -p %{buildroot}%{_datadir}/icons/hicolor/108x108/apps
mkdir -p %{buildroot}%{_datadir}/icons/hicolor/128x128/apps
mkdir -p %{buildroot}%{_datadir}/icons/hicolor/172x172/apps
cp -a %{SOURCE2}/86x86/%{name}.png %{buildroot}%{_datadir}/icons/hicolor/86x86/apps
cp -a %{SOURCE2}/108x108/%{name}.png %{buildroot}%{_datadir}/icons/hicolor/108x108/apps
cp -a %{SOURCE2}/128x128/%{name}.png %{buildroot}%{_datadir}/icons/hicolor/128x128/apps
cp -a %{SOURCE2}/172x172/%{name}.png %{buildroot}%{_datadir}/icons/hicolor/172x172/apps
%clean
rm -rf %{buildroot}
%files
%defattr(-,root,root,-)
%{_bindir}/*
%{_datadir}/applications/%{name}.desktop
%{_datadir}/icons/hicolor/*/apps/%{name}.png

make rpm

/* GNU ld script
   Dummy script to avoid dependency on libutil.so */
ASSERT(1, "Unreachable")

scp nemo@192.168.2.15:/usr/lib/crt1.o ./lib

[target.armv7-unknown-linux-gnueabihf]
rustflags = ["-C", "link-args=-L lib lib/crt1.o"]
linker = "bin/armv7hl-meego-linux-gnueabi-ld"

undefined reference to `__libc_csu_fini'
undefined reference to `__libc_csu_init'

#[no_mangle]
pub extern "C" fn __libc_csu_init() {}
#[no_mangle]
pub extern "C" fn __libc_csu_fini() {}
fn main() {
    println!("Hello, world!");
}

$ aurora-rust-helloworld
-bash: /usr/bin/aurora-rust-helloworld: /usr/lib/ld.so.1: bad ELF
interpreter: No such file or directory

$ ldd /usr/bin/aurora-rust-helloworld
  linux-vdso.so.1 (0xbeff4000)
  libgcc_s.so.1 => /lib/libgcc_s.so.1 (0xa707f000)
  librt.so.1 => /lib/librt.so.1 (0xa7069000)
  libpthread.so.0 => /lib/libpthread.so.0 (0xa7042000)
  libm.so.6 => /lib/libm.so.6 (0xa6fc6000)
  libdl.so.2 => /lib/libdl.so.2 (0xa6fb3000)
  libc.so.6 => /lib/libc.so.6 (0xa6e95000)
  /usr/lib/ld.so.1 => /lib/ld-linux-armhf.so.3 (0xa70e7000)

[target.armv7-unknown-linux-gnueabihf]
rustflags = ["-C", "link-args=-L lib lib/crt1.o --dynamic-linker /lib/ld-linux-armhf.so.3"]
linker = "bin/armv7hl-meego-linux-gnueabi-ld"

$ aurora-rust-helloworld
Hello, world!

scp nemo@192.168.2.15:/usr/lib/libstdc++.so ./lib
scp nemo@192.168.2.15:/usr/lib/libQt5Core.so.5 ./lib/libQt5Core.so
scp nemo@192.168.2.15:/usr/lib/libQt5Gui.so.5 ./lib/libQt5Gui.so
scp nemo@192.168.2.15:/usr/lib/libQt5Qml.so.5 ./lib/libQt5Qml.so
scp nemo@192.168.2.15:/usr/lib/libQt5Quick.so.5 ./lib/libQt5Quick.so
scp nemo@192.168.2.15:/usr/lib/libGLESv2.so.2 ./lib
scp nemo@192.168.2.15:/usr/lib/libpng16.so.16 ./lib
scp nemo@192.168.2.15:/usr/lib/libz.so.1 ./lib
scp nemo@192.168.2.15:/usr/lib/libicui18n.so.63 ./lib
scp nemo@192.168.2.15:/usr/lib/libicuuc.so.63 ./lib
scp nemo@192.168.2.15:/usr/lib/libpcre16.so.0 ./lib
scp nemo@192.168.2.15:/usr/lib/libglib-2.0.so.0 ./lib
scp nemo@192.168.2.15:/usr/lib/libsystemd.so.0 ./lib
scp nemo@192.168.2.15:/usr/lib/libQt5Network.so.5 ./lib
scp nemo@192.168.2.15:/lib/libresolv.so.2 ./lib
scp nemo@192.168.2.15:/usr/lib/libhybris-common.so.1 ./lib
scp nemo@192.168.2.15:/usr/lib/libicudata.so.63 ./lib
scp nemo@192.168.2.15:/usr/lib/libpcre.so.1 ./lib
scp nemo@192.168.2.15:/usr/lib/libselinux.so.1 ./lib
scp nemo@192.168.2.15:/usr/lib/liblzma.so.5 ./lib
scp nemo@192.168.2.15:/usr/lib/libgcrypt.so.11 ./lib
scp nemo@192.168.2.15:/usr/lib/libgpg-error.so.0 ./lib
scp nemo@192.168.2.15:/usr/lib/libcap.so.2 ./lib
scp nemo@192.168.2.15:/usr/lib/libsailfishapp.so.1 ./lib/libsailfishapp.so
scp nemo@192.168.2.15:/usr/lib/libmdeclarativecache5.so.0 ./lib
scp nemo@192.168.2.15:/usr/lib/libmlite5.so.0 ./lib
scp nemo@192.168.2.15:/usr/lib/libdconf.so.1 ./lib
scp nemo@192.168.2.15:/usr/lib/libgobject-2.0.so.0 ./lib
scp nemo@192.168.2.15:/usr/lib/libQt5DBus.so.5 ./lib
scp nemo@192.168.2.15:/usr/lib/libdconf.so.1 ./lib
scp nemo@192.168.2.15:/usr/lib/libffi.so.6 ./lib
scp nemo@192.168.2.15:/usr/lib/libdbus-1.so.3 ./lib
scp nemo@192.168.2.15:/usr/lib/libgio-2.0.so.0 ./lib
scp nemo@192.168.2.15:/usr/lib/libgmodule-2.0.so.0 ./lib

fn main() {
    let include_path = "include";
    let qt_include_path = "include/qt5";
    let sailfish_include_path = "include/sailfishapp";
    let library_path = "lib";
    let mut config = cpp_build::Config::new();
    config
        .include(include_path)
        .include(qt_include_path)
        .include(sailfish_include_path)
        .opt_level(2)
        .flag("-std=gnu++1y")
        .flag("-mfloat-abi=hard")
        .flag("-mfpu=neon")
        .flag("-mthumb")
        .build("src/main.rs");
    println!("cargo:rustc-link-search={}", library_path);
    println!("cargo:rustc-link-lib=sailfishapp");
    println!("cargo:rustc-link-lib=Qt5Gui");
    println!("cargo:rustc-link-lib=Qt5Core");
    println!("cargo:rustc-link-lib=Qt5Quick");
    println!("cargo:rustc-link-lib=Qt5Qml");
}

[package]
# ...
build = "build.rs"
[dependencies]
cpp = "0.5.6"
[build-dependencies]
cpp_build = "0.5.6"
#...

#[macro_use]
extern crate cpp;
mod qbytearray;
mod qstring;
mod qurl;
mod sailfishapp;
use sailfishapp::SailfishApp;
#[no_mangle]
pub extern "C" fn __libc_csu_init() {}
#[no_mangle]
pub extern "C" fn __libc_csu_fini() {}
fn main() {
    let mut app = SailfishApp::new();
    app.set_source("main.qml".into());
    app.show();
    app.exec();
}

use crate::qstring::QString;
cpp! {{
    #include <sailfishapp.h>
    #include <QtCore/QDebug>
    #include <QtGui/QGuiApplication>
    #include <QtQuick/QQuickView>
    #include <QtQml/QQmlEngine>
    #include <memory>
    struct SailfishAppHolder {
        std::unique_ptr<QGuiApplication> app;
        std::unique_ptr<QQuickView> view;
        SailfishAppHolder() {
            qDebug() << "SailfishAppHolder::SailfishAppHolder()";
            int argc = 1;
            char *argv[] = { "aurora-rust-gui" };
            app.reset(SailfishApp::application(argc, argv));
            view.reset(SailfishApp::createView());
            view->engine()->addImportPath("/usr/share/aurora-rust-gui/qml");
        }
    };
}}
cpp_class!(
    pub unsafe struct SailfishApp as "SailfishAppHolder"
);
impl SailfishApp {
    /// Creates a new SailfishApp.
    pub fn new() -> Self {
        cpp!(unsafe [] -> SailfishApp as "SailfishAppHolder" {
            qDebug() << "SailfishApp::new()";
            return SailfishAppHolder();
        })
    }
    /// Sets the main QML (see QQuickView::setSource for details).
    pub fn set_source(&mut self, url: QString) {
        cpp!(unsafe [self as "SailfishAppHolder *", url as "QString"] {
            const auto full_url = QString("/usr/share/aurora-rust-gui/qml/%1").arg(url);
            qDebug() << "SailfishApp::set_source()" << full_url;
            self->view->setSource(full_url);
        });
    }
    /// Shows the main view.
    pub fn show(&self) {
        cpp!(unsafe [self as "SailfishAppHolder *"] {
            qDebug() << "SailfishApp::show()";
            self->view->showFullScreen();
        })
    }
    /// Launches the application.
    pub fn exec(&self) {
        cpp!(unsafe [self as "SailfishAppHolder *"] {
            qDebug() << "SailfishApp::exec()";
            self->app->exec();
        })
    }
}

// ...
#ifdef QT_QML_DEBUG
#include <QtQuick>
#endif
#include <QtCore/QtGlobal>  // Было `#include <QtGlobal>`
#include <QtCore/QUrl>      // Было `#include <QUrl>`
class QGuiApplication;
class QQuickView;
class QString;
// ...

import QtQuick 2.6
import Sailfish.Silica 1.0
ApplicationWindow {
    cover: Qt.resolvedUrl("cover.qml")
    initialPage: Page {
        allowedOrientations: Orientation.LandscapeMask
        Label {
            anchors.centerIn: parent
            text: "Hello, Aurora!"
        }
    }
}

import QtQuick 2.6
import Sailfish.Silica 1.0
CoverBackground {
    Rectangle {
        id: background
        anchors.fill: parent
        color: "blue"
        Label {
            id: label
            anchors.centerIn: parent
            text: "Rust GUI"
            color: "white"
        }
    }
    CoverActionList {
        id: coverAction
        CoverAction {
            iconSource: "image://theme/icon-cover-cancel"
            onTriggered: Qt.quit()
        }
    }
}

# ...
Source3: qml
# ...
%install
# ...
mkdir -p %{buildroot}%{_datadir}/%{name}
cp -ra %{SOURCE3} %{buildroot}%{_datadir}/%{name}/qml
%clean
rm -rf %{buildroot}
%files
# ...
%{_datadir}/%{name}/qml

# ...
rpm:
  # ...
  @cp -rvf qml ./target/armv7-unknown-linux-gnueabihf/release/rpmbuild/SOURCES
# ...

make clean
make release
make rpm

$ devel-su
Password:
# pkcon install-local ./aurora-rust-gui-0.1.0-1.armv7hl.rpm
Installing files
Testing changes
Finished
Installing files
Starting
Resolving dependencies
Installing packages
Downloading packages
Installing packages
Finished
Downloaded    aurora-rust-gui-0.1.0-1.armv7hl (PK_TMP_DIR)
    Rust GUI example for Aurora OS
Installed     aurora-rust-gui-0.1.0-1.armv7hl (PK_TMP_DIR)
    Rust GUI example for Aurora OS
# exit
$ aurora-rust-gui
[D] __cpp_closure_14219197022164792912_impl:33 - SailfishApp::new()
[D] SailfishAppHolder::SailfishAppHolder:15 - SailfishAppHolder::SailfishAppHolder()
[D] unknown:0 - Using Wayland-EGL
library "libpq_cust_base.so" not found
[D] __cpp_closure_16802020016530731597:42 - SailfishApp::set_source() "/usr/share/aurora-rust-gui/qml/main.qml"
[W] unknown:0 - Could not find any zN.M subdirs!
[W] unknown:0 - Theme dir "/usr/share/themes/sailfish-default/meegotouch/z1.0/" does not exist
[W] unknown:0 - Theme dir "/usr/share/themes/sailfish-default/meegotouch/" does not exist
[D] onCompleted:432 - Warning: specifying an object instance for initialPage is sub-optimal - prefer to use a Component
[D] __cpp_closure_12585295123509486988:50 - SailfishApp::show()
[D] __cpp_closure_15029454612933909268:59 - SailfishApp::exec()

[target.armv7-unknown-linux-gnueabihf]
rustflags = ["-C", "link-args=-L lib lib/crt1.o -rpath lib --dynamic-linker /lib/ld-linux-armhf.so.3 -export-dynamic"]
linker = "bin/armv7hl-meego-linux-gnueabi-ld"