[DO-976] libpng recipe (!5)

Co-authored-by: aleksandr.vodyanov <aleksandr.vodyanov@avroid.tech>
Reviewed-on: https://git.avroid.tech/Conan/conan_build/pulls/5

recipes/libpng/all/test_package/CMakeLists.txt

@@ -0,0 +1,7 @@
+cmake_minimum_required(VERSION 3.15)
+project(test_package LANGUAGES C)
+
+find_package(PNG REQUIRED)
+
+add_executable(${PROJECT_NAME} test_package.c)
+target_link_libraries(${PROJECT_NAME} PRIVATE PNG::PNG)

recipes/libpng/all/test_package/conanfile.py

@@ -0,0 +1,26 @@
+from conan import ConanFile
+from conan.tools.build import can_run
+from conan.tools.cmake import CMake, cmake_layout
+import os
+
+
+class TestPackageConan(ConanFile):
+    settings = "os", "arch", "compiler", "build_type"
+    generators = "CMakeToolchain", "CMakeDeps", "VirtualRunEnv"
+    test_type = "explicit"
+
+    def layout(self):
+        cmake_layout(self)
+
+    def requirements(self):
+        self.requires(self.tested_reference_str)
+
+    def build(self):
+        cmake = CMake(self)
+        cmake.configure()
+        cmake.build()
+
+    def test(self):
+        if can_run(self):
+            bin_path = os.path.join(self.cpp.build.bindirs[0], "test_package")
+            self.run(bin_path, env="conanrun")

recipes/libpng/all/test_package/test_package.c

@@ -0,0 +1,16 @@
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include "png.h"
+
+
+int main(void) {
+    png_structp png_ptr;
+    png_infop info_ptr;
+
+    fprintf(stderr, "   Compiled with libpng %s; using libpng %s.\n", PNG_LIBPNG_VER_STRING, png_libpng_ver);
+    png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
+    info_ptr = png_create_info_struct(png_ptr);
+
+    return EXIT_SUCCESS;
+}