tests: add a C++ example recipe

This simple C++ project supports compilation with cmake and with meson.
It's supposed to be used with oe-selftest for the devtool ide plugin.

Signed-off-by: Adrian Freihofer <[email protected]>

meta-selftest/recipes-test/cpp/.gitignore

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+build*

meta-selftest/recipes-test/cpp/cmake-example.bb

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+#
+# Copyright OpenEmbedded Contributors
+#
+# SPDX-License-Identifier: MIT
+#
+
+SUMMARY = "A C++ example compiled with cmake."
+
+inherit cmake
+
+require cpp-example.inc
+
+SRC_URI += "\
+    file://CMakeLists.txt \
+"
+
+FILES:${PN}-ptest += "${bindir}/test-cmake-example"

meta-selftest/recipes-test/cpp/cmake-example/run-ptest

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+#!/bin/sh
+#
+# Copyright OpenEmbedded Contributors
+#
+# SPDX-License-Identifier: MIT
+#
+
+test-cmake-example
+
+# Note: run-ptests exits with exit value from test-cmake-example

meta-selftest/recipes-test/cpp/cpp-example.inc

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+#
+# Copyright OpenEmbedded Contributors
+#
+# SPDX-License-Identifier: MIT
+#
+
+LICENSE = "MIT"
+LIC_FILES_CHKSUM = "file://${COMMON_LICENSE_DIR}/MIT;md5=0835ade698e0bcf8506ecda2f7b4f302"
+
+inherit ptest
+
+DEPENDS += "json-c"
+
+PV = "1.0"
+
+S = "${WORKDIR}"
+
+SRC_URI = "\
+    file://cpp-example.cpp \
+    file://cpp-example-lib.hpp \
+    file://cpp-example-lib.cpp \
+    file://test-cpp-example.cpp \
+    file://run-ptest \
+"

meta-selftest/recipes-test/cpp/files/CMakeLists.txt

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+#
+# Copyright OpenEmbedded Contributors
+#
+# SPDX-License-Identifier: MIT
+#
+
+cmake_minimum_required(VERSION 3.22)
+
+project(cmake-example
+  VERSION 1.0.0
+  LANGUAGES CXX
+)
+
+option(BUILD_SHARED_LIBS "Build using shared libraries" ON)
+
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD_REQUIRED On)
+set(CMAKE_CXX_EXTENSIONS Off)
+
+include(GNUInstallDirs)
+
+# Find json-c
+# find_package(PkgConfig REQUIRED)
+# pkg_check_modules(JSONC REQUIRED json-c)
+find_package(json-c)
+
+# A simple library linking json-c library found by pkgconfig
+add_library(cmake-example-lib cpp-example-lib.cpp cpp-example-lib.hpp)
+set_target_properties(cmake-example-lib PROPERTIES 
+    VERSION ${PROJECT_VERSION}
+    SOVERSION ${PROJECT_VERSION_MAJOR}
+)
+target_link_libraries(cmake-example-lib PRIVATE json-c::json-c)
+# target_link_libraries(cmake-example-lib ${JSONC_LIBRARIES})
+# target_include_directories(cmake-example-lib PUBLIC ${JSONC_INCLUDE_DIRS})
+# target_compile_options(cmake-example-lib PUBLIC ${JSONC_CFLAGS_OTHER})
+install(TARGETS cmake-example-lib
+    INCLUDES DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+    ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
+    LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
+)
+
+# A simple executable linking the library
+add_executable(cmake-example cpp-example.cpp)
+target_link_libraries(cmake-example PRIVATE cmake-example-lib)
+
+install(TARGETS cmake-example
+    RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
+)
+
+# A simple test executable for testing the library
+add_executable(test-cmake-example test-cpp-example.cpp)
+target_link_libraries(test-cmake-example PRIVATE cmake-example-lib)
+
+install(TARGETS test-cmake-example
+    RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
+)
+
+include(CTest)
+add_test(NAME test-cmake-example COMMAND test-cmake-example)

meta-selftest/recipes-test/cpp/files/cpp-example-lib.cpp

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+/*
+* Copyright OpenEmbedded Contributors
+*
+* SPDX-License-Identifier: MIT
+*/
+
+#include <string>
+#include <json-c/json.h>
+#include "cpp-example-lib.hpp"
+
+const std::string& CppExample::get_string() {
+    return test_string;
+}
+
+const char* CppExample::get_json_c_version() {
+    return json_c_version();
+}

meta-selftest/recipes-test/cpp/files/cpp-example-lib.hpp

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+/*
+* Copyright OpenEmbedded Contributors
+*
+* SPDX-License-Identifier: MIT
+*/
+
+#pragma once
+
+#include <string>
+
+struct CppExample {
+    inline static const std::string test_string = "cpp-example-lib Magic: 123456789";
+
+    const std::string& get_string();
+    const char* get_json_c_version();
+};

meta-selftest/recipes-test/cpp/files/cpp-example.cpp

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+/*
+* Copyright OpenEmbedded Contributors
+*
+* SPDX-License-Identifier: MIT
+*/
+
+#include "cpp-example-lib.hpp"
+
+#include <iostream>
+
+int main() {
+    auto cpp_example = CppExample();
+    std::cout << "C++ example linking " << cpp_example.get_string() << std::endl;
+    std::cout << "Linking json-c version " << cpp_example.get_json_c_version() << std::endl;
+    return 0;
+}

meta-selftest/recipes-test/cpp/files/meson.build

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+#
+# Copyright OpenEmbedded Contributors
+#
+# SPDX-License-Identifier: MIT
+#
+
+project('meson-example', 'cpp',
+    version: '1.0.0',
+    default_options: ['cpp_std=c++17']
+    )
+
+
+jsoncdep = dependency('json-c')
+
+mesonexlib = shared_library('mesonexlib',
+    'cpp-example-lib.cpp', 'cpp-example-lib.hpp',
+	version: meson.project_version(),
+	soversion: meson.project_version().split('.')[0],
+    dependencies : jsoncdep,
+    install : true
+    )
+
+executable('mesonex',
+    'cpp-example.cpp',
+    link_with : mesonexlib,
+    install : true
+    )
+
+test_mesonex = executable('test-mesonex',
+    'test-cpp-example.cpp',
+    link_with : mesonexlib,
+    install : true
+)
+test('meson example test', test_mesonex)

meta-selftest/recipes-test/cpp/files/test-cpp-example.cpp

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+/*
+* Copyright OpenEmbedded Contributors
+*
+* SPDX-License-Identifier: MIT
+*/
+
+#include "cpp-example-lib.hpp"
+
+#include <iostream>
+
+int main() {
+    auto cpp_example = CppExample();
+    auto ret_string = cpp_example.get_string();
+    if(0 == ret_string.compare(CppExample::test_string)) {
+        std::cout << "PASS: " << ret_string << " = " << CppExample::test_string << std::endl;
+    } else {
+        std::cout << "FAIL: " << ret_string << " != " << CppExample::test_string << std::endl;
+    }
+}

meta-selftest/recipes-test/cpp/meson-example.bb

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+#
+# Copyright OpenEmbedded Contributors
+#
+# SPDX-License-Identifier: MIT
+#
+
+SUMMARY = "A C++ example compiled with meson."
+
+inherit pkgconfig meson
+
+require cpp-example.inc
+
+SRC_URI += "\
+    file://meson.build \
+"
+
+FILES:${PN}-ptest += "${bindir}/test-mesonex"

meta-selftest/recipes-test/cpp/meson-example/run-ptest

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+#!/bin/sh
+#
+# Copyright OpenEmbedded Contributors
+#
+# SPDX-License-Identifier: MIT
+#
+
+test-mesonex
+
+# Note: run-ptests exits with exit value from test-mesonex