[magnum] Add recipe

recipes/magnum/all/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.1)
+project(cmake_wrapper)
+
+include(conanbuildinfo.cmake)
+conan_basic_setup()
+
+add_subdirectory("source_subfolder")

recipes/magnum/all/cmake/conan-magnum-vars.cmake

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+
+# Here we are reproducing the variables and call performed by the FindMagnum.cmake provided by the library
+
+# Read flags from configuration
+file(READ "${CMAKE_CURRENT_LIST_DIR}/../../include/Magnum/configure.h" _magnumConfigure)
+string(REGEX REPLACE ";" "\\\\;" _magnumConfigure "${_magnumConfigure}")
+string(REGEX REPLACE "\n" ";" _magnumConfigure "${_magnumConfigure}")
+set(_magnumFlags
+    BUILD_DEPRECATED
+    BUILD_STATIC
+    BUILD_STATIC_UNIQUE_GLOBALS
+    TARGET_GL
+    TARGET_GLES
+    TARGET_GLES2
+    TARGET_GLES3
+    TARGET_DESKTOP_GLES
+    TARGET_WEBGL
+    TARGET_HEADLESS
+    TARGET_VK)
+foreach(_magnumFlag ${_magnumFlags})
+    list(FIND _magnumConfigure "#define MAGNUM_${_magnumFlag}" _magnum_${_magnumFlag})
+    if(NOT _magnum_${_magnumFlag} EQUAL -1)
+        set(MAGNUM_${_magnumFlag} 1)
+    endif()
+endforeach()

recipes/magnum/all/conandata.yml

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+sources:
+  "2020.06":
+    url: "https://github.com/mosra/magnum/archive/refs/tags/v2020.06.tar.gz"
+    sha256: "98dfe802e56614e4e6bf750d9b693de46a5ed0c6eb479b0268f1a20bf34268bf"

recipes/magnum/all/test_package/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.1)
+project(test_package)
+
+include(${CMAKE_BINARY_DIR}/conanbuildinfo.cmake)
+conan_basic_setup(TARGETS)
+
+find_package(Magnum REQUIRED)
+
+add_executable(${PROJECT_NAME} test_package.cpp)
+target_link_libraries(${PROJECT_NAME} Magnum::Magnum)
+
+set_target_properties(${PROJECT_NAME}
+    PROPERTIES
+        CXX_STANDARD 11
+        CXX_STANDARD_REQUIRED ON
+        CXX_EXTENSIONS OFF
+)

recipes/magnum/all/test_package/conanfile.py

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+from conans import ConanFile, CMake, tools
+import os
+
+
+class TestPackageConan(ConanFile):
+    settings = "os", "compiler", "build_type", "arch"
+    generators = "cmake", "cmake_find_package"
+
+    def build(self):
+        cmake = CMake(self)
+        cmake.configure()
+        cmake.build()
+
+    def test(self):
+        if not tools.cross_building(self):
+            bin_path = os.path.join("bin", "test_package")
+            self.run(bin_path, run_environment=True)

recipes/magnum/all/test_package/test_package.cpp

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+#include <iostream>
+#include "Magnum/Math/Vector.h"
+#include "Magnum/Math/StrictWeakOrdering.h"
+
+
+// TODO: We should test here using Windowless applications
+
+int main() {
+    const Magnum::Math::Vector<2, Magnum::Float> v2a{1.0f, 2.0f};
+    const Magnum::Math::Vector<2, Magnum::Float> v2b{2.0f, 3.0f};
+    const Magnum::Math::Vector<2, Magnum::Float> v2c{1.0f, 3.0f};
+
+    Magnum::Math::StrictWeakOrdering o;
+    if (o(v2a, v2b)) {
+        std::cout << "Magnum working\n";
+    }
+    return 0;
+}

recipes/magnum/config.yml

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+versions:
+  "2020.06":
+    folder: all