cmake: Add CMakeRC module and ::rc namespace

This module allows to add binary files into UHD (e.g., for cal data
storage) in a platform-independent way.

The upstream CMakeRC.cmake is modified in the following way to allow
linkage against a shared object:

```diff
     # Generate the actual static library. Each source file is just a single file
     # with a character array compiled in containing the contents of the
     # corresponding resource file.
     add_library(${name} STATIC ${libcpp})
     set_property(TARGET ${name} PROPERTY CMRC_LIBDIR "${libdir}")
     set_property(TARGET ${name} PROPERTY CMRC_NAMESPACE "${ARG_NAMESPACE}")
     target_link_libraries(${name} PUBLIC cmrc::base)
     set_property(TARGET ${name} PROPERTY CMRC_IS_RESOURCE_LIBRARY TRUE)
+    set_property(TARGET ${name} PROPERTY POSITION_INDEPENDENT_CODE ON)
```

This forces the -fPIC flag for the static object that CMakeRC generates,
allowing to link it into a shared object file.

The version of CMakeRC used is: a7e355290, cloned from
git@github.com:vector-of-bool/cmrc.git.

2 files changed, 648 insertions, 0 deletions

diff --git a/host/cmake/Modules/CMakeRC.cmake b/host/cmake/Modules/CMakeRC.cmake
new file mode 100644
index 000000000..d1e389b93
--- /dev/null
+++ b/host/cmake/Modules/CMakeRC.cmake
@@ -0,0 +1,644 @@
+# CMakeRC is a third-party utility.
+# https://github.com/vector-of-bool/cmrc
+#
+# MIT License
+#
+# Copyright (c) 2017 vector-of-bool <vectorofbool@gmail.com>
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in all
+# copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+
+
+# This block is executed when generating an intermediate resource file, not when
+# running in CMake configure mode
+if(_CMRC_GENERATE_MODE)
+    # Read in the digits
+    file(READ "${INPUT_FILE}" bytes HEX)
+    # Format each pair into a character literal. Heuristics seem to favor doing
+    # the conversion in groups of five for fastest conversion
+    string(REGEX REPLACE "(..)(..)(..)(..)(..)" "'\\\\x\\1','\\\\x\\2','\\\\x\\3','\\\\x\\4','\\\\x\\5'," chars "${bytes}")
+    # Since we did this in groups, we have some leftovers to clean up
+    string(LENGTH "${bytes}" n_bytes2)
+    math(EXPR n_bytes "${n_bytes2} / 2")
+    math(EXPR remainder "${n_bytes} % 5") # <-- '5' is the grouping count from above
+    set(cleanup_re "$")
+    set(cleanup_sub )
+    while(remainder)
+        set(cleanup_re "(..)${cleanup_re}")
+        set(cleanup_sub "'\\\\x\\${remainder}',${cleanup_sub}")
+        math(EXPR remainder "${remainder} - 1")
+    endwhile()
+    if(NOT cleanup_re STREQUAL "$")
+        string(REGEX REPLACE "${cleanup_re}" "${cleanup_sub}" chars "${chars}")
+    endif()
+    string(CONFIGURE [[
+        namespace { const char file_array[] = { @chars@ 0 }; }
+        namespace cmrc { namespace @NAMESPACE@ { namespace res_chars {
+        extern const char* const @SYMBOL@_begin = file_array;
+        extern const char* const @SYMBOL@_end = file_array + @n_bytes@;
+        }}}
+    ]] code)
+    file(WRITE "${OUTPUT_FILE}" "${code}")
+    # Exit from the script. Nothing else needs to be processed
+    return()
+endif()
+
+set(_version 2.0.0)
+
+cmake_minimum_required(VERSION 3.3)
+include(CMakeParseArguments)
+
+if(COMMAND cmrc_add_resource_library)
+    if(NOT DEFINED _CMRC_VERSION OR NOT (_version STREQUAL _CMRC_VERSION))
+        message(WARNING "More than one CMakeRC version has been included in this project.")
+    endif()
+    # CMakeRC has already been included! Don't do anything
+    return()
+endif()
+
+set(_CMRC_VERSION "${_version}" CACHE INTERNAL "CMakeRC version. Used for checking for conflicts")
+
+set(_CMRC_SCRIPT "${CMAKE_CURRENT_LIST_FILE}" CACHE INTERNAL "Path to CMakeRC script")
+
+function(_cmrc_normalize_path var)
+    set(path "${${var}}")
+    file(TO_CMAKE_PATH "${path}" path)
+    while(path MATCHES "//")
+        string(REPLACE "//" "/" path "${path}")
+    endwhile()
+    string(REGEX REPLACE "/+$" "" path "${path}")
+    set("${var}" "${path}" PARENT_SCOPE)
+endfunction()
+
+get_filename_component(_inc_dir "${CMAKE_BINARY_DIR}/_cmrc/include" ABSOLUTE)
+set(CMRC_INCLUDE_DIR "${_inc_dir}" CACHE INTERNAL "Directory for CMakeRC include files")
+# Let's generate the primary include file
+file(MAKE_DIRECTORY "${CMRC_INCLUDE_DIR}/cmrc")
+set(hpp_content [==[
+#ifndef CMRC_CMRC_HPP_INCLUDED
+#define CMRC_CMRC_HPP_INCLUDED
+
+#include <cassert>
+#include <functional>
+#include <iterator>
+#include <list>
+#include <map>
+#include <mutex>
+#include <string>
+#include <system_error>
+#include <type_traits>
+
+namespace cmrc { namespace detail { struct dummy; } }
+
+#define CMRC_DECLARE(libid) \
+    namespace cmrc { namespace detail { \
+    struct dummy; \
+    static_assert(std::is_same<dummy, ::cmrc::detail::dummy>::value, "CMRC_DECLARE() must only appear at the global namespace"); \
+    } } \
+    namespace cmrc { namespace libid { \
+    cmrc::embedded_filesystem get_filesystem(); \
+    } } static_assert(true, "")
+
+namespace cmrc {
+
+class file {
+    const char* _begin = nullptr;
+    const char* _end = nullptr;
+
+public:
+    using iterator = const char*;
+    using const_iterator = iterator;
+    iterator begin() const noexcept { return _begin; }
+    iterator cbegin() const noexcept { return _begin; }
+    iterator end() const noexcept { return _end; }
+    iterator cend() const noexcept { return _end; }
+    std::size_t size() const { return std::distance(begin(), end()); }
+
+    file() = default;
+    file(iterator beg, iterator end) noexcept : _begin(beg), _end(end) {}
+};
+
+class directory_entry;
+
+namespace detail {
+
+class directory;
+class file_data;
+
+class file_or_directory {
+    union _data_t {
+        class file_data* file_data;
+        class directory* directory;
+    } _data;
+    bool _is_file = true;
+
+public:
+    explicit file_or_directory(file_data& f) {
+        _data.file_data = &f;
+    }
+    explicit file_or_directory(directory& d) {
+        _data.directory = &d;
+        _is_file = false;
+    }
+    bool is_file() const noexcept {
+        return _is_file;
+    }
+    bool is_directory() const noexcept {
+        return !is_file();
+    }
+    const directory& as_directory() const noexcept {
+        assert(!is_file());
+        return *_data.directory;
+    }
+    const file_data& as_file() const noexcept {
+        assert(is_file());
+        return *_data.file_data;
+    }
+};
+
+class file_data {
+public:
+    const char* begin_ptr;
+    const char* end_ptr;
+    file_data(const file_data&) = delete;
+    file_data(const char* b, const char* e) : begin_ptr(b), end_ptr(e) {}
+};
+
+inline std::pair<std::string, std::string> split_path(const std::string& path) {
+    auto first_sep = path.find("/");
+    if (first_sep == path.npos) {
+        return std::make_pair(path, "");
+    } else {
+        return std::make_pair(path.substr(0, first_sep), path.substr(first_sep + 1));
+    }
+}
+
+struct created_subdirectory {
+    class directory& directory;
+    class file_or_directory& index_entry;
+};
+
+class directory {
+    std::list<file_data> _files;
+    std::list<directory> _dirs;
+    std::map<std::string, file_or_directory> _index;
+
+    using base_iterator = std::map<std::string, file_or_directory>::const_iterator;
+
+public:
+
+    directory() = default;
+    directory(const directory&) = delete;
+
+    created_subdirectory add_subdir(std::string name) & {
+        _dirs.emplace_back();
+        auto& back = _dirs.back();
+        auto& fod = _index.emplace(name, file_or_directory{back}).first->second;
+        return created_subdirectory{back, fod};
+    }
+
+    file_or_directory* add_file(std::string name, const char* begin, const char* end) & {
+        assert(_index.find(name) == _index.end());
+        _files.emplace_back(begin, end);
+        return &_index.emplace(name, file_or_directory{_files.back()}).first->second;
+    }
+
+    const file_or_directory* get(const std::string& path) const {
+        auto pair = split_path(path);
+        auto child = _index.find(pair.first);
+        if (child == _index.end()) {
+            return nullptr;
+        }
+        auto& entry  = child->second;
+        if (pair.second.empty()) {
+            // We're at the end of the path
+            return &entry;
+        }
+
+        if (entry.is_file()) {
+            // We can't traverse into a file. Stop.
+            return nullptr;
+        }
+        // Keep going down
+        return entry.as_directory().get(pair.second);
+    }
+
+    class iterator {
+        base_iterator _base_iter;
+        base_iterator _end_iter;
+    public:
+        using value_type = directory_entry;
+        using difference_type = std::ptrdiff_t;
+        using pointer = const value_type*;
+        using reference = const value_type&;
+        using iterator_category = std::input_iterator_tag;
+
+        iterator() = default;
+        explicit iterator(base_iterator iter, base_iterator end) : _base_iter(iter), _end_iter(end) {}
+
+        iterator begin() const noexcept {
+            return *this;
+        }
+
+        iterator end() const noexcept {
+            return iterator(_end_iter, _end_iter);
+        }
+
+        inline value_type operator*() const noexcept;
+
+        bool operator==(const iterator& rhs) const noexcept {
+            return _base_iter == rhs._base_iter;
+        }
+
+        bool operator!=(const iterator& rhs) const noexcept {
+            return !(*this == rhs);
+        }
+
+        iterator operator++() noexcept {
+            auto cp = *this;
+            ++_base_iter;
+            return cp;
+        }
+
+        iterator& operator++(int) noexcept {
+            ++_base_iter;
+            return *this;
+        }
+    };
+
+    using const_iterator = iterator;
+
+    iterator begin() const noexcept {
+        return iterator(_index.begin(), _index.end());
+    }
+
+    iterator end() const noexcept {
+        return iterator();
+    }
+};
+
+inline std::string normalize_path(std::string path) {
+    while (path.find("/") == 0) {
+        path.erase(path.begin());
+    }
+    while (!path.empty() && (path.rfind("/") == path.size() - 1)) {
+        path.pop_back();
+    }
+    auto off = path.npos;
+    while ((off = path.find("//")) != path.npos) {
+        path.erase(path.begin() + off);
+    }
+    return path;
+}
+
+using index_type = std::map<std::string, const cmrc::detail::file_or_directory*>;
+
+} // detail
+
+class directory_entry {
+    std::string _fname;
+    const detail::file_or_directory* _item;
+
+public:
+    directory_entry() = delete;
+    explicit directory_entry(std::string filename, const detail::file_or_directory& item)
+        : _fname(filename)
+        , _item(&item)
+    {}
+
+    const std::string& filename() const & {
+        return _fname;
+    }
+    std::string filename() const && {
+        return std::move(_fname);
+    }
+
+    bool is_file() const {
+        return _item->is_file();
+    }
+
+    bool is_directory() const {
+        return _item->is_directory();
+    }
+};
+
+directory_entry detail::directory::iterator::operator*() const noexcept {
+    assert(begin() != end());
+    return directory_entry(_base_iter->first, _base_iter->second);
+}
+
+using directory_iterator = detail::directory::iterator;
+
+class embedded_filesystem {
+    // Never-null:
+    const cmrc::detail::index_type* _index;
+    const detail::file_or_directory* _get(std::string path) const {
+        path = detail::normalize_path(path);
+        auto found = _index->find(path);
+        if (found == _index->end()) {
+            return nullptr;
+        } else {
+            return found->second;
+        }
+    }
+
+public:
+    explicit embedded_filesystem(const detail::index_type& index)
+        : _index(&index)
+    {}
+
+    file open(const std::string& path) const {
+        auto entry_ptr = _get(path);
+        if (!entry_ptr || !entry_ptr->is_file()) {
+            throw std::system_error(make_error_code(std::errc::no_such_file_or_directory), path);
+        }
+        auto& dat = entry_ptr->as_file();
+        return file{dat.begin_ptr, dat.end_ptr};
+    }
+
+    bool is_file(const std::string& path) const noexcept {
+        auto entry_ptr = _get(path);
+        return entry_ptr && entry_ptr->is_file();
+    }
+
+    bool is_directory(const std::string& path) const noexcept {
+        auto entry_ptr = _get(path);
+        return entry_ptr && entry_ptr->is_directory();
+    }
+
+    bool exists(const std::string& path) const noexcept {
+        return !!_get(path);
+    }
+
+    directory_iterator iterate_directory(const std::string& path) const {
+        auto entry_ptr = _get(path);
+        if (!entry_ptr) {
+            throw std::system_error(make_error_code(std::errc::no_such_file_or_directory), path);
+        }
+        if (!entry_ptr->is_directory()) {
+            throw std::system_error(make_error_code(std::errc::not_a_directory), path);
+        }
+        return entry_ptr->as_directory().begin();
+    }
+};
+
+}
+
+#endif // CMRC_CMRC_HPP_INCLUDED
+]==])
+
+set(cmrc_hpp "${CMRC_INCLUDE_DIR}/cmrc/cmrc.hpp" CACHE INTERNAL "")
+set(_generate 1)
+if(EXISTS "${cmrc_hpp}")
+    file(READ "${cmrc_hpp}" _current)
+    if(_current STREQUAL hpp_content)
+        set(_generate 0)
+    endif()
+endif()
+file(GENERATE OUTPUT "${cmrc_hpp}" CONTENT "${hpp_content}" CONDITION ${_generate})
+
+add_library(cmrc-base INTERFACE)
+target_include_directories(cmrc-base INTERFACE "${CMRC_INCLUDE_DIR}")
+# Signal a basic C++11 feature to require C++11.
+target_compile_features(cmrc-base INTERFACE cxx_nullptr)
+set_property(TARGET cmrc-base PROPERTY INTERFACE_CXX_EXTENSIONS OFF)
+add_library(cmrc::base ALIAS cmrc-base)
+
+function(cmrc_add_resource_library name)
+    set(args ALIAS NAMESPACE)
+    cmake_parse_arguments(ARG "" "${args}" "" "${ARGN}")
+    # Generate the identifier for the resource library's namespace
+    set(ns_re "[a-zA-Z_][a-zA-Z0-9_]*")
+    if(NOT DEFINED ARG_NAMESPACE)
+        # Check that the library name is also a valid namespace
+        if(NOT name MATCHES "${ns_re}")
+            message(SEND_ERROR "Library name is not a valid namespace. Specify the NAMESPACE argument")
+        endif()
+        set(ARG_NAMESPACE "${name}")
+    else()
+        if(NOT ARG_NAMESPACE MATCHES "${ns_re}")
+            message(SEND_ERROR "NAMESPACE for ${name} is not a valid C++ namespace identifier (${ARG_NAMESPACE})")
+        endif()
+    endif()
+    set(libname "${name}")
+    # Generate a library with the compiled in character arrays.
+    string(CONFIGURE [=[
+        #include <cmrc/cmrc.hpp>
+        #include <map>
+        #include <utility>
+
+        namespace cmrc {
+        namespace @ARG_NAMESPACE@ {
+
+        namespace res_chars {
+        // These are the files which are available in this resource library
+        $<JOIN:$<TARGET_PROPERTY:@libname@,CMRC_EXTERN_DECLS>,
+        >
+        }
+
+        namespace {
+
+        const cmrc::detail::index_type&
+        get_root_index() {
+            static cmrc::detail::directory root_directory_;
+            static cmrc::detail::file_or_directory root_directory_fod{root_directory_};
+            static cmrc::detail::index_type root_index;
+            root_index.emplace("", &root_directory_fod);
+            struct dir_inl {
+                class cmrc::detail::directory& directory;
+            };
+            dir_inl root_directory_dir{root_directory_};
+            (void)root_directory_dir;
+            $<JOIN:$<TARGET_PROPERTY:@libname@,CMRC_MAKE_DIRS>,
+            >
+            $<JOIN:$<TARGET_PROPERTY:@libname@,CMRC_MAKE_FILES>,
+            >
+            return root_index;
+        }
+
+        }
+
+        cmrc::embedded_filesystem get_filesystem() {
+            static auto& index = get_root_index();
+            return cmrc::embedded_filesystem{index};
+        }
+
+        } // @ARG_NAMESPACE@
+        } // cmrc
+    ]=] cpp_content @ONLY)
+    get_filename_component(libdir "${CMAKE_CURRENT_BINARY_DIR}/__cmrc_${name}" ABSOLUTE)
+    get_filename_component(lib_tmp_cpp "${libdir}/lib_.cpp" ABSOLUTE)
+    string(REPLACE "\n        " "\n" cpp_content "${cpp_content}")
+    file(GENERATE OUTPUT "${lib_tmp_cpp}" CONTENT "${cpp_content}")
+    get_filename_component(libcpp "${libdir}/lib.cpp" ABSOLUTE)
+    add_custom_command(OUTPUT "${libcpp}"
+        DEPENDS "${lib_tmp_cpp}" "${cmrc_hpp}"
+        COMMAND ${CMAKE_COMMAND} -E copy_if_different "${lib_tmp_cpp}" "${libcpp}"
+        COMMENT "Generating ${name} resource loader"
+        )
+    # Generate the actual static library. Each source file is just a single file
+    # with a character array compiled in containing the contents of the
+    # corresponding resource file.
+    add_library(${name} STATIC ${libcpp})
+    set_property(TARGET ${name} PROPERTY CMRC_LIBDIR "${libdir}")
+    set_property(TARGET ${name} PROPERTY CMRC_NAMESPACE "${ARG_NAMESPACE}")
+    target_link_libraries(${name} PUBLIC cmrc::base)
+    set_property(TARGET ${name} PROPERTY CMRC_IS_RESOURCE_LIBRARY TRUE)
+    set_property(TARGET ${name} PROPERTY POSITION_INDEPENDENT_CODE ON)
+    if(ARG_ALIAS)
+        add_library("${ARG_ALIAS}" ALIAS ${name})
+    endif()
+    cmrc_add_resources(${name} ${ARG_UNPARSED_ARGUMENTS})
+endfunction()
+
+function(_cmrc_register_dirs name dirpath)
+    if(dirpath STREQUAL "")
+        return()
+    endif()
+    # Skip this dir if we have already registered it
+    get_target_property(registered "${name}" _CMRC_REGISTERED_DIRS)
+    if(dirpath IN_LIST registered)
+        return()
+    endif()
+    # Register the parent directory first
+    get_filename_component(parent "${dirpath}" DIRECTORY)
+    if(NOT parent STREQUAL "")
+        _cmrc_register_dirs("${name}" "${parent}")
+    endif()
+    # Now generate the registration
+    set_property(TARGET "${name}" APPEND PROPERTY _CMRC_REGISTERED_DIRS "${dirpath}")
+    _cm_encode_fpath(sym "${dirpath}")
+    if(parent STREQUAL "")
+        set(parent_sym root_directory)
+    else()
+        _cm_encode_fpath(parent_sym "${parent}")
+    endif()
+    get_filename_component(leaf "${dirpath}" NAME)
+    set_property(
+        TARGET "${name}"
+        APPEND PROPERTY CMRC_MAKE_DIRS
+        "static auto ${sym}_dir = ${parent_sym}_dir.directory.add_subdir(\"${leaf}\")\;"
+        "root_index.emplace(\"${dirpath}\", &${sym}_dir.index_entry)\;"
+        )
+endfunction()
+
+function(cmrc_add_resources name)
+    get_target_property(is_reslib ${name} CMRC_IS_RESOURCE_LIBRARY)
+    if(NOT TARGET ${name} OR NOT is_reslib)
+        message(SEND_ERROR "cmrc_add_resources called on target '${name}' which is not an existing resource library")
+        return()
+    endif()
+
+    set(options)
+    set(args WHENCE PREFIX)
+    set(list_args)
+    cmake_parse_arguments(ARG "${options}" "${args}" "${list_args}" "${ARGN}")
+
+    if(NOT ARG_WHENCE)
+        set(ARG_WHENCE ${CMAKE_CURRENT_SOURCE_DIR})
+    endif()
+    _cmrc_normalize_path(ARG_WHENCE)
+    get_filename_component(ARG_WHENCE "${ARG_WHENCE}" ABSOLUTE)
+
+    # Generate the identifier for the resource library's namespace
+    get_target_property(lib_ns "${name}" CMRC_NAMESPACE)
+
+    get_target_property(libdir ${name} CMRC_LIBDIR)
+    get_target_property(target_dir ${name} SOURCE_DIR)
+    file(RELATIVE_PATH reldir "${target_dir}" "${CMAKE_CURRENT_SOURCE_DIR}")
+    if(reldir MATCHES "^\\.\\.")
+        message(SEND_ERROR "Cannot call cmrc_add_resources in a parent directory from the resource library target")
+        return()
+    endif()
+
+    foreach(input IN LISTS ARG_UNPARSED_ARGUMENTS)
+        _cmrc_normalize_path(input)
+        get_filename_component(abs_in "${input}" ABSOLUTE)
+        # Generate a filename based on the input filename that we can put in
+        # the intermediate directory.
+        file(RELATIVE_PATH relpath "${ARG_WHENCE}" "${abs_in}")
+        if(relpath MATCHES "^\\.\\.")
+            # For now we just error on files that exist outside of the soure dir.
+            message(SEND_ERROR "Cannot add file '${input}': File must be in a subdirectory of ${ARG_WHENCE}")
+            continue()
+        endif()
+        if(DEFINED ARG_PREFIX)
+            _cmrc_normalize_path(ARG_PREFIX)
+        endif()
+        if(ARG_PREFIX AND NOT ARG_PREFIX MATCHES "/$")
+            set(ARG_PREFIX "${ARG_PREFIX}/")
+        endif()
+        get_filename_component(dirpath "${ARG_PREFIX}${relpath}" DIRECTORY)
+        _cmrc_register_dirs("${name}" "${dirpath}")
+        get_filename_component(abs_out "${libdir}/intermediate/${relpath}.cpp" ABSOLUTE)
+        # Generate a symbol name relpath the file's character array
+        _cm_encode_fpath(sym "${relpath}")
+        # Get the symbol name for the parent directory
+        if(dirpath STREQUAL "")
+            set(parent_sym root_directory)
+        else()
+            _cm_encode_fpath(parent_sym "${dirpath}")
+        endif()
+        # Generate the rule for the intermediate source file
+        _cmrc_generate_intermediate_cpp(${lib_ns} ${sym} "${abs_out}" "${abs_in}")
+        target_sources(${name} PRIVATE "${abs_out}")
+        set_property(TARGET ${name} APPEND PROPERTY CMRC_EXTERN_DECLS
+            "// Pointers to ${input}"
+            "extern const char* const ${sym}_begin\;"
+            "extern const char* const ${sym}_end\;"
+            )
+        get_filename_component(leaf "${relpath}" NAME)
+        set_property(
+            TARGET ${name}
+            APPEND PROPERTY CMRC_MAKE_FILES
+            "root_index.emplace("
+            "    \"${ARG_PREFIX}${relpath}\","
+            "    ${parent_sym}_dir.directory.add_file("
+            "        \"${leaf}\","
+            "        res_chars::${sym}_begin,"
+            "        res_chars::${sym}_end"
+            "    )"
+            ")\;"
+            )
+    endforeach()
+endfunction()
+
+function(_cmrc_generate_intermediate_cpp lib_ns symbol outfile infile)
+    add_custom_command(
+        # This is the file we will generate
+        OUTPUT "${outfile}"
+        # These are the primary files that affect the output
+        DEPENDS "${infile}" "${_CMRC_SCRIPT}"
+        COMMAND
+            "${CMAKE_COMMAND}"
+                -D_CMRC_GENERATE_MODE=TRUE
+                -DNAMESPACE=${lib_ns}
+                -DSYMBOL=${symbol}
+                "-DINPUT_FILE=${infile}"
+                "-DOUTPUT_FILE=${outfile}"
+                -P "${_CMRC_SCRIPT}"
+        COMMENT "Generating intermediate file for ${infile}"
+    )
+endfunction()
+
+function(_cm_encode_fpath var fpath)
+    string(MAKE_C_IDENTIFIER "${fpath}" ident)
+    string(MD5 hash "${fpath}")
+    string(SUBSTRING "${hash}" 0 4 hash)
+    set(${var} f_${hash}_${ident} PARENT_SCOPE)
+endfunction()
diff --git a/host/cmake/debian/copyright b/host/cmake/debian/copyright
index 9a661d4ce..a4027a4cf 100644
--- a/host/cmake/debian/copyright
+++ b/host/cmake/debian/copyright
@@ -51,6 +51,10 @@ Files: host/cmake/Modules/FindUSB1.cmake
 Copyright: Copyright (c) 2006, 2008  Laurent Montel, <montel@kde.org>
 License: Kitware-BSD
 
+Files: host/cmake/Modules/CMakeRC.cmake
+Copyright: Copyright (c) 2017 vector-of-bool <vectorofbool@gmail.com>
+License: MIT
+
 Files: firmware/fx2/*
 Copyright: 2003,2004,2006,2007 Free Software Foundation, Inc.
 License: GPL-3+