conanfile.py

from conans import ConanFile, tools, CMake
import os

required_conan_version = ">=1.43.0"


class ZlibConan(ConanFile):
    name = "zlib"
    url = "https://github.com/conan-io/conan-center-index"
    homepage = "https://zlib.net"
    license = "Zlib"
    description = ("A Massively Spiffy Yet Delicately Unobtrusive Compression Library "
                   "(Also Free, Not to Mention Unencumbered by Patents)")
    topics = ("zlib", "compression")

    settings = "os", "arch", "compiler", "build_type"
    options = {
        "shared": [True, False],
        "fPIC": [True, False],
    }
    default_options = {
        "shared": False,
        "fPIC": True,
    }

    generators = "cmake"

    @property
    def _source_subfolder(self):
        return "source_subfolder"

    @property
    def _build_subfolder(self):
        return "build_subfolder"

    def export_sources(self):
        self.copy("CMakeLists.txt")
        for patch in self.conan_data.get("patches", {}).get(self.version, []):
            self.copy(patch["patch_file"])

    def config_options(self):
        if self.settings.os == "Windows":
            del self.options.fPIC

    def configure(self):
        if self.options.shared:
            del self.options.fPIC
        del self.settings.compiler.libcxx
        del self.settings.compiler.cppstd

    def source(self):
        tools.get(**self.conan_data["sources"][self.version], destination=self._source_subfolder, strip_root=True)

    def _patch_sources(self):
        for patch in self.conan_data.get("patches", {}).get(self.version, []):
            tools.patch(**patch)

        with tools.chdir(self._source_subfolder):
            # https://github.com/madler/zlib/issues/268
            tools.replace_in_file('gzguts.h',
                                  '#if defined(_WIN32) || defined(__CYGWIN__)',
                                  '#if defined(_WIN32) || defined(__MINGW32__)')

            is_apple_clang12 = self.settings.compiler == "apple-clang" and tools.Version(self.settings.compiler.version) >= "12.0"
            if not is_apple_clang12:
                for filename in ['zconf.h', 'zconf.h.cmakein', 'zconf.h.in']:
                    tools.replace_in_file(filename,
                                          '#ifdef HAVE_UNISTD_H    '
                                          '/* may be set to #if 1 by ./configure */',
                                          '#if defined(HAVE_UNISTD_H) && (1-HAVE_UNISTD_H-1 != 0)')
                    tools.replace_in_file(filename,
                                          '#ifdef HAVE_STDARG_H    '
                                          '/* may be set to #if 1 by ./configure */',
                                          '#if defined(HAVE_STDARG_H) && (1-HAVE_STDARG_H-1 != 0)')

    def build(self):
        self._patch_sources()
        make_target = "zlib" if self.options.shared else "zlibstatic"
        cmake = CMake(self)
        cmake.configure(build_folder=self._build_subfolder)
        cmake.build(target=make_target)

    def _rename_libraries(self):
        if self.settings.os == "Windows":
            lib_path = os.path.join(self.package_folder, "lib")
            suffix = "d" if self.settings.build_type == "Debug" else ""

            if self.options.shared:
                if self.settings.compiler == "Visual Studio" and suffix:
                    current_lib = os.path.join(lib_path, "zlib%s.lib" % suffix)
                    tools.rename(current_lib, os.path.join(lib_path, "zlib.lib"))
            else:
                if self.settings.compiler == "Visual Studio":
                    current_lib = os.path.join(lib_path, "zlibstatic%s.lib" % suffix)
                    tools.rename(current_lib, os.path.join(lib_path, "zlib.lib"))
                elif self.settings.compiler in ("clang", "gcc", ):
                    if not self.settings.os.subsystem:
                        current_lib = os.path.join(lib_path, "libzlibstatic.a")
                        tools.rename(current_lib, os.path.join(lib_path, "libzlib.a"))

    def _extract_license(self):
        with tools.chdir(os.path.join(self.source_folder, self._source_subfolder)):
            tmp = tools.load("zlib.h")
            license_contents = tmp[2:tmp.find("*/", 1)]
            tools.save("LICENSE", license_contents)

    def package(self):
        self._extract_license()
        self.copy("LICENSE", src=self._source_subfolder, dst="licenses")

        # Copy headers
        for header in ["*zlib.h", "*zconf.h"]:
            self.copy(pattern=header, dst="include", src=self._source_subfolder, keep_path=False)
            self.copy(pattern=header, dst="include", src=self._build_subfolder, keep_path=False)

        # Copying static and dynamic libs
        if self.options.shared:
            self.copy(pattern="*.dylib*", dst="lib", src=self._build_subfolder, keep_path=False, symlinks=True)
            self.copy(pattern="*.so*", dst="lib", src=self._build_subfolder, keep_path=False, symlinks=True)
            self.copy(pattern="*.dll", dst="bin", src=self._build_subfolder, keep_path=False)
            self.copy(pattern="*.dll.a", dst="lib", src=self._build_subfolder, keep_path=False)
        else:
            self.copy(pattern="*.a", dst="lib", src=self._build_subfolder, keep_path=False)
        self.copy(pattern="*.lib", dst="lib", src=self._build_subfolder, keep_path=False)

        self._rename_libraries()

    def package_info(self):
        self.cpp_info.set_property("cmake_file_name", "ZLIB")
        self.cpp_info.set_property("cmake_target_name", "ZLIB::ZLIB")
        self.cpp_info.set_property("cmake_find_mode", "both")
        self.cpp_info.libs.append("zlib" if self.settings.os == "Windows" and not self.settings.os.subsystem else "z")

        self.cpp_info.names["cmake_find_package"] = "ZLIB"
        self.cpp_info.names["cmake_find_package_multi"] = "ZLIB"