gitlab-ci: Expand CI job for building with a C++ compiler

This tests out if libweston can be built with a C++ compiler and catch
potential issues which we don't normally see.

We re-use one of the builds, the full-x86-64 one, and build this new
front-end alongside it.

Signed-off-by: Marius Vlad <marius.vlad@collabora.com>

.gitlab-ci.yml

@@ -260,12 +260,15 @@ aarch64-debian-container_prep:
   timeout: 15m
   variables:
     BUILDDIR: $CI_PROJECT_DIR/build-weston-$CI_JOB_NAME
+    BUILDDIR_WESTINY: $CI_PROJECT_DIR/build-westiny-$CI_JOB_NAME
     PREFIX: $CI_PROJECT_DIR/prefix-weston-$CI_JOB_NAME
+    PREFIX_WESTINY: $CI_PROJECT_DIR/prefix-westiny-$CI_JOB_NAME
   before_script:
   - export PATH=~/.local/bin:$PATH
   - export XDG_RUNTIME_DIR="$(mktemp -p $(pwd) -d xdg-runtime-XXXXXX)"
   - export TESTS_RES_PATH="$BUILDDIR/tests-res.txt"
   - mkdir "$BUILDDIR" "$PREFIX"
+  - mkdir "$BUILDDIR_WESTINY" "$PREFIX_WESTINY"
 
 .build-with-clang:
   variables:
@@ -286,6 +289,17 @@ aarch64-debian-container_prep:
   - meson --prefix="$PREFIX" --wrap-mode=nofallback -Db_sanitize=address ${MESON_OPTIONS} ${MESON_TOOLCHAIN_OPTIONS} ${MESON_DIST_OPTIONS} ..
   - ninja -k0 -j${FDO_CI_CONCURRENT:-4}
   - ninja install
+  - |
+    if [ "$CI_JOB_NAME" == "x86_64-debian-full-build" ]; then
+      cd "$BUILDDIR_WESTINY"
+      export NPREFIX=$CI_PROJECT_DIR/prefix-weston-$CI_JOB_NAME
+      export PKG_CONFIG_PATH=$NPREFIX/lib/pkgconfig/:$NPREFIX/share/pkgconfig/:$NPREFIX/lib/x86_64-linux-gnu/pkgconfig:$PKG_CONFIG_PATH
+      meson setup --prefix="$PREFIX_WESTINY" --wrap-mode=nofallback ../westinyplus/
+      ninja -k0 -j${FDO_CI_CONCURRENT:-4}
+      ninja install
+      ninja clean
+      cd -
+    fi
   - test -n "${QEMU_SMP}" || QEMU_SMP=${FDO_CI_CONCURRENT:-4}
   - virtme-run --rw --pwd --kimg /weston-virtme/${KERNEL_IMAGE} --kopt quiet --kopt log_buf_len=2M --script-sh ../.gitlab-ci/virtme-scripts/run-weston-tests.sh --qemu-opts -m 4096 -smp ${QEMU_SMP}
   - TEST_RES=$(cat $TESTS_RES_PATH)

westinyplus/meson.build

@@ -0,0 +1,40 @@
+project('westinyplus',
+  'c', 'cpp',
+  version: '0.0.90',
+  default_options: [
+    'warning_level=3',
+    'cpp_std=c++20',
+    'werror=true',
+  ],
+  meson_version: '>= 1.0.0',
+  license: 'MIT/Expat',
+)
+
+cxx = meson.get_compiler('cpp')
+
+add_project_arguments(
+  cxx.get_supported_arguments([
+    '-Wno-unused-parameter',
+    '-Wno-pedantic',
+    '-Wno-deprecated-declarations'
+  ]),
+  language: 'cpp'
+)
+
+add_project_arguments([
+    '-DPACKAGE_STRING="westinyplus @0@"'.format(meson.project_version()),
+    '-D_GNU_SOURCE',
+    '-D_ALL_SOURCE',
+  ],
+  language: [ 'cpp', 'c' ],
+)
+
+exe_westinyplus = executable(
+    'westinyplus',
+    sources: [ 'src/main.cpp' ],
+    dependencies: [ dependency('wayland-server'),
+    dependency('weston'),
+    dependency('libweston-14') ],
+    include_directories : include_directories('.'),
+    install: false
+)

westinyplus/src/main.cpp

@@ -0,0 +1,31 @@
+/*
+ * Copyright © 2024 Collabora, Ltd.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial
+ * portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT.  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include "main.h"
+
+int main(int argc, char *argv[])
+{
+	return 0;
+}

westinyplus/src/main.h

@@ -0,0 +1,46 @@
+/*
+ * Copyright © 2024 Collabora, Ltd.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial
+ * portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT.  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#pragma once
+
+#include <weston.h>
+#include <libweston/libweston.h>
+#include <libweston/weston-log.h>
+#include <libweston/desktop.h>
+#include <libweston/config-parser.h>
+#include <libweston/shell-utils.h>
+#include <libweston/zalloc.h>
+#include <libweston/matrix.h>
+#include <libweston/xwayland-api.h>
+
+#include <libweston/backend-drm.h>
+#include <libweston/backend-headless.h>
+#include <libweston/backend-x11.h>
+#include <libweston/backend-wayland.h>
+
+#include <libweston/backend-rdp.h>
+#include <libweston/backend-vnc.h>
+#include <libweston/backend-pipewire.h>
+#include <libweston/windowed-output-api.h>