fromTarget

pub fn fromTarget(target: *const Target) Query {
    var result: Query = .{
        .cpu_arch = target.cpu.arch,
        .cpu_model = .{ .explicit = target.cpu.model },
        .os_tag = target.os.tag,
        .os_version_min = undefined,
        .os_version_max = undefined,
        .abi = target.abi,
        .glibc_version = if (target.abi.isGnu()) target.os.versionRange().gnuLibCVersion() else null,
        .android_api_level = if (target.abi.isAndroid()) target.os.version_range.linux.android else null,
    };
    result.updateOsVersionRange(target.os);

    const all_features = target.cpu.arch.allFeaturesList();
    var cpu_model_set = target.cpu.model.features;
    cpu_model_set.populateDependencies(all_features);
    {
        // The "add" set is the full set with the CPU Model set removed.
        const add_set = &result.cpu_features_add;
        add_set.* = target.cpu.features;
        add_set.removeFeatureSet(cpu_model_set);
    }
    {
        // The "sub" set is the features that are on in CPU Model set and off in the full set.
        const sub_set = &result.cpu_features_sub;
        sub_set.* = cpu_model_set;
        sub_set.removeFeatureSet(target.cpu.features);
    }
    return result;
}