nanobind: add new recipe

recipes/nanobind/all/conandata.yml

@@ -0,0 +1,4 @@
+sources:
+  "1.6.1":
+    url: "https://github.com/wjakob/nanobind/archive/refs/tags/v1.6.1.tar.gz"
+    sha256: "6acf2cfef781b8b7d82a8c298c1bfe7ccb4dd0de06626b69ed1c99a71a93e78d"

recipes/nanobind/all/conanfile.py

@@ -0,0 +1,152 @@
+import os
+
+from conan import ConanFile
+from conan.errors import ConanInvalidConfiguration
+from conan.tools.build import check_min_cppstd
+from conan.tools.cmake import CMake, CMakeToolchain, cmake_layout, CMakeDeps
+from conan.tools.files import get, copy, rm, replace_in_file, save, rename
+from conan.tools.scm import Version
+
+required_conan_version = ">=1.53.0"
+
+
+class PackageConan(ConanFile):
+    name = "nanobind"
+    description = "Tiny and efficient C++/Python bindings"
+    license = "BSD-3-Clause"
+    url = "https://github.com/conan-io/conan-center-index"
+    homepage = "https://github.com/wjakob/nanobind"
+    topics = ("python", "bindings", "pybind11")
+
+    package_type = "library"
+    settings = "os", "arch", "compiler", "build_type"
+    options = {
+        "shared": [True, False],
+        "fPIC": [True, False],
+        "stable_abi": [True, False],
+        "domain": [None, "ANY"],
+    }
+    default_options = {
+        "shared": False,
+        "fPIC": True,
+        "stable_abi": False,  # FIXME: should be True by default
+        "domain": None,
+    }
+
+    @property
+    def _min_cppstd(self):
+        return 17
+
+    @property
+    def _compilers_minimum_version(self):
+        return {
+            "gcc": "7",
+            "clang": "5",
+            "apple-clang": "10",
+            "msvc": "192",
+            "Visual Studio": "15",
+        }
+
+    def config_options(self):
+        if self.settings.os == "Windows":
+            del self.options.fPIC
+
+    def configure(self):
+        if self.options.shared:
+            self.options.rm_safe("fPIC")
+
+    def layout(self):
+        cmake_layout(self, src_folder="src")
+
+    def requirements(self):
+        self.requires("tsl-robin-map/1.2.1")
+        # FIXME: add cpython dependency
+        # self.requires("cpython/3.12.0")
+
+    def validate(self):
+        if self.settings.compiler.cppstd:
+            check_min_cppstd(self, self._min_cppstd)
+        minimum_version = self._compilers_minimum_version.get(str(self.settings.compiler), False)
+        if minimum_version and Version(self.settings.compiler.version) < minimum_version:
+            raise ConanInvalidConfiguration(
+                f"{self.ref} requires C++{self._min_cppstd}, which your compiler does not support."
+            )
+        # FIXME: need to check that we are using CPython 3.12+ for self.options.stable_abi
+
+    def source(self):
+        get(self, **self.conan_data["sources"][self.version], strip_root=True)
+
+    def generate(self):
+        tc = CMakeToolchain(self)
+        tc.cache_variables["NB_TEST"] = False
+        tc.generate()
+        deps = CMakeDeps(self)
+        deps.generate()
+
+    @property
+    def _libname(self):
+        libname = "nanobind"
+        if not self.options.shared:
+            libname += "-static"
+        if self.options.stable_abi:
+            libname += "-abi3"
+        if self.options.domain and self.options.shared:
+            libname += f"-{self.options.domain}"
+        return libname
+
+    def build(self):
+        self._patch_sources()
+        cmake = CMake(self)
+        cmake.configure()
+        cmake.build(target=self._libname)
+
+    def _patch_sources(self):
+        cmakelists = os.path.join(self.source_folder, "CMakeLists.txt")
+        nb_config = os.path.join(self.source_folder, "cmake", "nanobind-config.cmake")
+        # tsl-robin-map has been unvendored, skip a check for its presence
+        replace_in_file(self, cmakelists, "if (NOT IS_DIRECTORY", "if (FALSE AND NOT IS_DIRECTORY")
+        # Force building of nanobind lib
+        save(self, cmakelists, f"\nnanobind_build_library({self._libname})", append=True)
+        # Link against tsl-robin-map and install the lib and headers
+        replace_in_file(
+            self,
+            nb_config,
+            "target_include_directories(${TARGET_NAME} PRIVATE\n    ${NB_DIR}/ext/robin_map/include)\n",
+            (
+                "find_package(tsl-robin-map REQUIRED CONFIG)\n"
+                "target_link_libraries(${TARGET_NAME} PRIVATE tsl::robin_map)\n"
+                "include(GNUInstallDirs)\n"
+                "install(TARGETS ${TARGET_NAME})\n"
+                "install(DIRECTORY ${NB_DIR}/include/ DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})\n"
+            ),
+        )
+        # No need to build the lib inside nanobind_add_module() call
+        replace_in_file(self, nb_config, "nanobind_build_library(${libname})\n", "")
+        # Link against previously built nanobind and Python
+        # FIXME: the CPython include dirs should be added by Conan automatically
+        replace_in_file(
+            self,
+            nb_config,
+            "target_link_libraries(${name} PRIVATE ${libname})\n",
+            (
+                "target_link_libraries(${name} PRIVATE nanobind::nanobind)\n"
+                "target_include_directories(${name} PUBLIC ${Python_INCLUDE_DIRS})\n"
+            ),
+        )
+
+    def package(self):
+        copy(self, "LICENSE", dst=os.path.join(self.package_folder, "licenses"), src=self.source_folder)
+        cmake = CMake(self)
+        cmake.install()
+        copy(self, "nanobind-config.cmake",
+             src=os.path.join(self.source_folder, "cmake"),
+             dst=os.path.join(self.package_folder, "lib", "cmake"))
+        rename(self,
+               os.path.join(self.package_folder, "lib", "cmake", "nanobind-config.cmake"),
+               os.path.join(self.package_folder, "lib", "cmake", "nanobind-conan-config.cmake"))
+        rm(self, "*.pdb", self.package_folder, recursive=True)
+
+    def package_info(self):
+        self.cpp_info.libs = [self._libname]
+        self.cpp_info.builddirs = [os.path.join(self.package_folder, "lib", "cmake")]
+        self.cpp_info.set_property("cmake_build_modules", [os.path.join("lib", "cmake", "nanobind-conan-config.cmake")])

recipes/nanobind/all/test_package/CMakeLists.txt

@@ -0,0 +1,10 @@
+cmake_minimum_required(VERSION 3.15)
+project(test_package CXX)
+
+find_package(Python 3.8
+  REQUIRED COMPONENTS Interpreter Development.Module
+  OPTIONAL_COMPONENTS Development.SABIModule)
+
+find_package(nanobind CONFIG REQUIRED)
+
+nanobind_add_module(test_package STABLE_ABI NB_STATIC test_package.cpp)

recipes/nanobind/all/test_package/conanfile.py

@@ -0,0 +1,35 @@
+import importlib
+import sys
+
+from conan import ConanFile
+from conan.tools.build import can_run
+from conan.tools.cmake import cmake_layout, CMake
+
+
+class TestPackageConan(ConanFile):
+    settings = "os", "arch", "compiler", "build_type"
+    generators = "CMakeDeps", "CMakeToolchain", "VirtualRunEnv"
+    test_type = "explicit"
+
+    def requirements(self):
+        self.requires(self.tested_reference_str)
+
+    def layout(self):
+        cmake_layout(self)
+
+    def build(self):
+        cmake = CMake(self)
+        cmake.configure()
+        cmake.build()
+
+    def _test_nanobind_module(self):
+        sys.path.append(self.build_folder)
+        # Cannot use 'import test_package' due to pylint
+        test_package = importlib.import_module("test_package")
+        assert test_package.add(2, 3) == 5
+        self.output.info("test_package.add(2, 3) ran successfully")
+        sys.path.pop()
+
+    def test(self):
+        if can_run(self):
+            self._test_nanobind_module()

recipes/nanobind/all/test_package/test_package.cpp

@@ -0,0 +1,8 @@
+#include <nanobind/nanobind.h>
+
+namespace nb = nanobind;
+using namespace nb::literals;
+
+NB_MODULE(test_package, m) {
+    m.def("add", [](int a, int b) { return a + b; }, "a"_a, "b"_a);
+}

recipes/nanobind/config.yml

@@ -0,0 +1,3 @@
+versions:
+  "1.6.1":
+    folder: all