[boost-predef] Add Modular Boost Predef recipe

recipes/boost-predef/all/conandata.yml

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+sources:
+  "1.83.0":
+    url:
+      - "https://github.com/boostorg/predef/archive/refs/tags/boost-1.83.0.tar.gz"
+    sha256: "c0d8a35f9258846f9daa511c0de052fcce0c88dbe1e697f3047118c31fa13854"

recipes/boost-predef/all/conanfile.py

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+from conan import ConanFile
+from conan.errors import ConanInvalidConfiguration
+from conan.tools.build import check_min_cppstd
+from conan.tools.files import (
+    apply_conandata_patches, copy, export_conandata_patches,
+    get, mkdir, rename, rm, rmdir
+)
+from conan.tools.layout import basic_layout
+from conan.tools.scm import Version
+
+import glob
+import os
+
+required_conan_version = ">=1.53.0"
+
+class BoostPredefConan(ConanFile):
+    name = "boost-predef"
+    description = "This library defines a set of compiler, architecture, operating system, library, and other version numbers from the information it can gather of C, C++, Objective C, and Objective C++ predefined macros or those defined in generally available headers."
+    url = "https://github.com/boostorg/predef"
+    homepage = "https://www.boost.org"
+    license = "BSL-1.0"
+    topics = ("libraries", "cpp")
+
+    settings = "os", "arch", "compiler", "build_type"
+    options = {}
+    default_options = {}
+
+    short_paths = True
+    no_copy_source = True
+
+    @property
+    def _min_cppstd(self):
+        return 11
+
+    def export_sources(self):
+        export_conandata_patches(self)
+
+    def config_options(self):
+        pass
+
+    def configure(self):
+        pass
+
+    def layout(self):
+        basic_layout(self, src_folder="src")
+
+    def validate(self):
+        if self.settings.compiler.get_safe("cppstd"):
+            check_min_cppstd(self, self._min_cppstd)
+
+    def requirements(self):
+        pass
+
+    def package_id(self):
+        self.info.clear()
+
+    def build_requirements(self):
+        pass
+
+    def source(self):
+        get(self, **self.conan_data["sources"][self.version],
+            destination=self.source_folder, strip_root=True)
+        apply_conandata_patches(self)
+
+    def build(self):
+        apply_conandata_patches(self)
+
+    def package(self):
+        copy(
+            self,
+            "*",
+            os.path.join(self.source_folder, "include"),
+            os.path.join(self.package_folder, "include"),
+        )
+
+    def package_info(self):
+        # Folders not used for header-only
+        self.cpp_info.bindirs = []
+        self.cpp_info.libdirs = []
+
+        self.env_info.BOOST_ROOT = self.package_folder
+
+        self.cpp_info.set_property("cmake_file_name", "Boost")
+        self.cpp_info.filenames["cmake_find_package"] = "Boost"
+        self.cpp_info.filenames["cmake_find_package_multi"] = "Boost"
+        self.cpp_info.names["cmake_find_package"] = "Boost"
+        self.cpp_info.names["cmake_find_package_multi"] = "Boost"
+
+        # - Use 'predef' component for all includes + defines
+
+        self.cpp_info.components["predef"].libs = []
+        self.cpp_info.components["predef"].libdirs = []
+        self.cpp_info.components["predef"].set_property("cmake_target_name", "Boost::predef")
+        self.cpp_info.components["predef"].names["cmake_find_package"] = "predef"
+        self.cpp_info.components["predef"].names["cmake_find_package_multi"] = "predef"
+        self.cpp_info.components["predef"].names["pkg_config"] = "boost"
+
+        # # Boost::boost is an alias of Boost::predef
+        # self.cpp_info.components["_boost_cmake"].requires = ["predef"]
+        # self.cpp_info.components["_boost_cmake"].set_property("cmake_target_name", "Boost::boost")
+        # self.cpp_info.components["_boost_cmake"].names["cmake_find_package"] = "boost"
+        # self.cpp_info.components["_boost_cmake"].names["cmake_find_package_multi"] = "boost"
+
+        # if self.options.header_only:
+        # self.cpp_info.components["_boost_cmake"].libdirs = []

recipes/boost-predef/all/test_package/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.15)
+project(test_package LANGUAGES CXX)
+
+if(UNIX AND NOT APPLE)
+    # use RPATH instead of RUNPATH so that
+    # transitive dependencies can be located
+    add_link_options("LINKER:--disable-new-dtags")
+endif()
+
+include(CTest)
+enable_testing()
+
+find_package(Boost REQUIRED)
+add_executable(main_exe main.cpp)
+target_link_libraries(main_exe PRIVATE Boost::predef)
+add_test(NAME boost_boost COMMAND main_exe)

recipes/boost-predef/all/test_package/conanfile.py

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+from conan import ConanFile
+from conan.errors import ConanException
+from conan.tools.build import can_run
+from conan.tools.cmake import CMake, CMakeToolchain, cmake_layout
+from conan.tools.files import chdir
+
+
+class TestPackageConan(ConanFile):
+    settings = "os", "arch", "compiler", "build_type"
+    generators = "CMakeDeps", "VirtualBuildEnv", "VirtualRunEnv"
+    test_type = "explicit"
+
+    def layout(self):
+        cmake_layout(self)
+
+    def requirements(self):
+        self.requires(self.tested_reference_str)
+
+    def generate(self):
+        tc = CMakeToolchain(self)
+        tc.generate()
+
+    def build(self):
+        cmake = CMake(self)
+        cmake.configure()
+        cmake.build()
+
+    def test(self):
+        if not can_run(self):
+            return
+        with chdir(self, self.folders.build_folder):
+            # When boost and its dependencies are built as shared libraries,
+            # the test executables need to locate them. Typically the
+            # `conanrun` env should be enough, but this may cause problems on macOS
+            # where the CMake installation has dependencies on Apple-provided
+            # system libraries that are incompatible with Conan-provided ones.
+            # When `conanrun` is enabled, DYLD_LIBRARY_PATH will also apply
+            # to ctest itself. Given that CMake already embeds RPATHs by default,
+            # we can bypass this by using the `conanbuild` environment on
+            # non-Windows platforms, while still retaining the correct behaviour.
+            env = "conanrun" if self.settings.os == "Windows" else "conanbuild"
+            self.run(f"ctest --output-on-failure -C {self.settings.build_type}", env=env)

recipes/boost-predef/all/test_package/main.cpp

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+#include <boost/predef.h>
+#include <iostream>
+
+int main(int argc, const char * const argv[]) {
+        std::cout << "C++ Standard version: " << BOOST_LANG_STDCPP << "\n";
+    return 0;
+}

recipes/boost-predef/all/test_v1_package/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.1)
+project(test_v1_package)
+
+enable_testing()
+
+include(${CMAKE_BINARY_DIR}/conanbuildinfo.cmake)
+conan_basic_setup(TARGETS)
+
+add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/../test_package
+                 ${CMAKE_CURRENT_BINARY_DIR}/test_package)

recipes/boost-predef/all/test_v1_package/conanfile.py

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+from conans import ConanFile, CMake, tools
+from conans.errors import ConanException
+import os
+
+
+class TestPackageConan(ConanFile):
+    settings = "os", "arch", "compiler", "build_type"
+    generators = "cmake", "cmake_find_package"
+
+    def build(self):
+        # FIXME: tools.vcvars added for clang-cl. Remove once conan supports clang-cl properly. (https://github.com/conan-io/conan-center-index/pull/1453)
+        with tools.vcvars(self.settings) if (self.settings.os == "Windows" and self.settings.compiler == "clang") else tools.no_op():
+            cmake = CMake(self)
+            cmake.configure()
+            # Disable parallel builds because c3i (=conan-center's test/build infrastructure) seems to choke here
+            cmake.parallel = False
+            cmake.build()
+
+    def test(self):
+        if tools.cross_building(self):
+            return
+        self.run(f"ctest --output-on-failure -C {self.settings.build_type}", run_environment=True)
+

recipes/boost-predef/config.yml

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+versions:
+  "1.83.0":
+    folder: all