Deprecation warnings with latest curl version

[zpervan]

I have started to use the curlcpp as part of my private project. As I'd like to make this always an exercise/learning experience, I have linked curlcpp with the, currently, latest curl (7.87.0) library from their GitHub page. This is generating a decent amount of deprecation warnings. It's not crashing anything, but maybe this is something to have a look.

Environment:

• Ubuntu 22.04
• GCC 11.3.0
• Build system: Bazel 5.4.0
• Curlcpp 2.1

Log:

INFO: From Compiling src/curl_form.cpp:
external/curlcpplib/src/curl_form.cpp: In destructor 'curl::curl_form::~curl_form()':
external/curlcpplib/src/curl_form.cpp:24:22: warning: 'void curl_formfree(curl_httppost*)' is deprecated: since 7.56.0. Use curl_mime_free() [-Wdeprecated-declarations]
   24 |         curl_formfree(this->form_post);
      |         ~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~
In file included from external/curlcpplib/include/curl_form.h:29,
                 from external/curlcpplib/src/curl_form.cpp:7:
external/curlcpplib/backends/curl-7.87.0/include/curl/curl.h:2606:1: note: declared here
 2606 | curl_formfree(struct curl_httppost *form);
      | ^~~~~~~~~~~~~
external/curlcpplib/src/curl_form.cpp: In member function 'curl::curl_form& curl::curl_form::operator=(const curl::curl_form&)':
external/curlcpplib/src/curl_form.cpp:35:18: warning: 'void curl_formfree(curl_httppost*)' is deprecated: since 7.56.0. Use curl_mime_free() [-Wdeprecated-declarations]
   35 |     curl_formfree(this->form_post);
      |     ~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~
In file included from external/curlcpplib/include/curl_form.h:29,
                 from external/curlcpplib/src/curl_form.cpp:7:
external/curlcpplib/backends/curl-7.87.0/include/curl/curl.h:2606:1: note: declared here
 2606 | curl_formfree(struct curl_httppost *form);
      | ^~~~~~~~~~~~~
external/curlcpplib/src/curl_form.cpp: In member function 'void curl::curl_form::add(const curl::curl_pair<CURLformoption, std::__cxx11::basic_string<char> >&, const curl::curl_pair<CURLformoption, std::__cxx11::basic_string<char> >&)':
external/curlcpplib/src/curl_form.cpp:57:21: warning: 'CURLFORMcode curl_formadd(curl_httppost**, curl_httppost**, ...)' is deprecated: since 7.56.0. Use curl_mime_init() [-Wdeprecated-declarations]
   57 |     if (curl_formadd(&this->form_post,&this->last_ptr,
      |         ~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   58 |                     form_name.first(),form_name.second(),
      |                     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   59 |                     form_content.first(),form_content.second(),
      |                     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   60 |                     CURLFORM_END) != 0) {
      |                     ~~~~~~~~~~~~~
In file included from external/curlcpplib/include/curl_form.h:29,
                 from external/curlcpplib/src/curl_form.cpp:7:
external/curlcpplib/backends/curl-7.87.0/include/curl/curl.h:2570:1: note: declared here
 2570 | curl_formadd(struct curl_httppost **httppost,
      | ^~~~~~~~~~~~
external/curlcpplib/src/curl_form.cpp: In member function 'void curl::curl_form::add(const curl::curl_pair<CURLformoption, std::__cxx11::basic_string<char> >&, const curl::curl_pair<CURLformoption, std::__cxx11::basic_string<char> >&, const curl::curl_pair<CURLformoption, std::__cxx11::basic_string<char> >&)':
external/curlcpplib/src/curl_form.cpp:71:21: warning: 'CURLFORMcode curl_formadd(curl_httppost**, curl_httppost**, ...)' is deprecated: since 7.56.0. Use curl_mime_init() [-Wdeprecated-declarations]
   71 |     if (curl_formadd(&this->form_post,&this->last_ptr,
      |         ~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   72 |                     form_name.first(),form_name.second(),
      |                     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   73 |                     form_content.first(),form_content.second(),
      |                     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   74 |                     content_type.first(),content_type.second(),
      |                     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   75 |                     CURLFORM_END) != 0) {
      |                     ~~~~~~~~~~~~~
In file included from external/curlcpplib/include/curl_form.h:29,
                 from external/curlcpplib/src/curl_form.cpp:7:
external/curlcpplib/backends/curl-7.87.0/include/curl/curl.h:2570:1: note: declared here
 2570 | curl_formadd(struct curl_httppost **httppost,
      | ^~~~~~~~~~~~
external/curlcpplib/src/curl_form.cpp: In member function 'void curl::curl_form::add(const curl::curl_pair<CURLformoption, std::__cxx11::basic_string<char> >&, const curl::curl_pair<CURLformoption, std::__cxx11::basic_string<char> >&, const curl::curl_pair<CURLformoption, int>&)':
external/curlcpplib/src/curl_form.cpp:85:21: warning: 'CURLFORMcode curl_formadd(curl_httppost**, curl_httppost**, ...)' is deprecated: since 7.56.0. Use curl_mime_init() [-Wdeprecated-declarations]
   85 |     if (curl_formadd(&this->form_post,&this->last_ptr,
      |         ~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   86 |                     form_name.first(),form_name.second(),
      |                     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   87 |                     form_content.first(),form_content.second(),
      |                     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   88 |                     content_length.first(),content_length.second(),
      |                     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   89 |                     CURLFORM_END) != 0) {
      |                     ~~~~~~~~~~~~~
In file included from external/curlcpplib/include/curl_form.h:29,
                 from external/curlcpplib/src/curl_form.cpp:7:
external/curlcpplib/backends/curl-7.87.0/include/curl/curl.h:2570:1: note: declared here
 2570 | curl_formadd(struct curl_httppost **httppost,
      | ^~~~~~~~~~~~
external/curlcpplib/src/curl_form.cpp: In member function 'void curl::curl_form::add(const curl::curl_pair<CURLformoption, std::__cxx11::basic_string<char> >&, const curl::curl_pair<CURLformoption, int>&, const curl::curl_pair<CURLformoption, std::__cxx11::basic_string<char> >&)':
external/curlcpplib/src/curl_form.cpp:100:21: warning: 'CURLFORMcode curl_formadd(curl_httppost**, curl_httppost**, ...)' is deprecated: since 7.56.0. Use curl_mime_init() [-Wdeprecated-declarations]
  100 |     if (curl_formadd(&this->form_post,&this->last_ptr,
      |         ~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  101 |                     form_name.first(),form_name.second(),
      |                     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  102 |                     form_content.first(),form_content.second(),
      |                     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  103 |                     name_length.first(),name_length.second(),
      |                     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  104 |                     CURLFORM_END) != 0) {
      |                     ~~~~~~~~~~~~~
In file included from external/curlcpplib/include/curl_form.h:29,
                 from external/curlcpplib/src/curl_form.cpp:7:
external/curlcpplib/backends/curl-7.87.0/include/curl/curl.h:2570:1: note: declared here
 2570 | curl_formadd(struct curl_httppost **httppost,
      | ^~~~~~~~~~~~
external/curlcpplib/src/curl_form.cpp: In member function 'void curl::curl_form::add(const curl::curl_pair<CURLformoption, std::__cxx11::basic_string<char> >&, const curl::curl_pair<CURLformoption, std::__cxx11::basic_string<char> >&, const curl::curl_pair<CURLformoption, int>&, const curl::curl_pair<CURLformoption, std::__cxx11::basic_string<char> >&)':
external/curlcpplib/src/curl_form.cpp:116:21: warning: 'CURLFORMcode curl_formadd(curl_httppost**, curl_httppost**, ...)' is deprecated: since 7.56.0. Use curl_mime_init() [-Wdeprecated-declarations]
  116 |     if (curl_formadd(&this->form_post,&this->last_ptr,
      |         ~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  117 |                     form_name.first(),form_name.second(),
      |                     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  118 |                     form_content.first(),form_content.second(),
      |                     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  119 |                     content_length.first(),content_length.second(),
      |                     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  120 |                     content_type.first(),content_type.second(),
      |                     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  121 |                     CURLFORM_END) != 0) {
      |                     ~~~~~~~~~~~~~
In file included from external/curlcpplib/include/curl_form.h:29,
                 from external/curlcpplib/src/curl_form.cpp:7:
external/curlcpplib/backends/curl-7.87.0/include/curl/curl.h:2570:1: note: declared here
 2570 | curl_formadd(struct curl_httppost **httppost,
      | ^~~~~~~~~~~~
external/curlcpplib/src/curl_form.cpp: In member function 'void curl::curl_form::add(const curl::curl_pair<CURLformoption, std::__cxx11::basic_string<char> >&, const curl::curl_pair<CURLformoption, std::__cxx11::basic_string<char> >&, const curl::curl_pair<CURLformoption, char*>&, const curl::curl_pair<CURLformoption, long int>&)':
external/curlcpplib/src/curl_form.cpp:133:21: warning: 'CURLFORMcode curl_formadd(curl_httppost**, curl_httppost**, ...)' is deprecated: since 7.56.0. Use curl_mime_init() [-Wdeprecated-declarations]
  133 |     if (curl_formadd(&this->form_post,&this->last_ptr,
      |         ~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  134 |                     form_name.first(),form_name.second(),
      |                     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  135 |                     form_bufname.first(),form_bufname.second(),
      |                     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  136 |                     form_content.first(),form_content.second(),
      |                     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  137 |                     content_length.first(),content_length.second(),
      |                     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  138 |                     CURLFORM_END) != 0) {
      |                     ~~~~~~~~~~~~~
In file included from external/curlcpplib/include/curl_form.h:29,
                 from external/curlcpplib/src/curl_form.cpp:7:
external/curlcpplib/backends/curl-7.87.0/include/curl/curl.h:2570:1: note: declared here
 2570 | curl_formadd(struct curl_httppost **httppost,
      | ^~~~~~~~~~~~
external/curlcpplib/src/curl_form.cpp: In member function 'void curl::curl_form::add(const curl::curl_pair<CURLformoption, std::__cxx11::basic_string<char> >&, const std::vector<std::__cxx11::basic_string<char> >&)':
external/curlcpplib/src/curl_form.cpp:154:31: warning: 'CURLFORM_FILE' is deprecated: since 7.56.0. Use curl_mime_filedata() [-Wdeprecated-declarations]
  154 |         new_files[i].option = CURLFORM_FILE;
      |                               ^~~~~~~~~~~~~
In file included from external/curlcpplib/include/curl_form.h:29,
                 from external/curlcpplib/src/curl_form.cpp:7:
external/curlcpplib/backends/curl-7.87.0/include/curl/curl.h:2504:3: note: declared here
 2504 |   CURLFORM_FILE            CURL_DEPRECATED(7.56.0, "Use curl_mime_filedata()"),
      |   ^~~~~~~~~~~~~
external/curlcpplib/src/curl_form.cpp:160:21: warning: 'CURLFORM_ARRAY' is deprecated: since 7.56.0.  [-Wdeprecated-declarations]
  160 |                     CURLFORM_ARRAY,new_files,
      |                     ^~~~~~~~~~~~~~
In file included from external/curlcpplib/include/curl_form.h:29,
                 from external/curlcpplib/src/curl_form.cpp:7:
external/curlcpplib/backends/curl-7.87.0/include/curl/curl.h:2502:3: note: declared here
 2502 |   CURLFORM_ARRAY           CURL_DEPRECATED(7.56.0, ""),
      |   ^~~~~~~~~~~~~~
external/curlcpplib/src/curl_form.cpp:158:21: warning: 'CURLFORMcode curl_formadd(curl_httppost**, curl_httppost**, ...)' is deprecated: since 7.56.0. Use curl_mime_init() [-Wdeprecated-declarations]
  158 |     if (curl_formadd(&this->form_post,&this->last_ptr,
      |         ~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  159 |                     form_name.first(),form_name.second(),
      |                     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  160 |                     CURLFORM_ARRAY,new_files,
      |                     ~~~~~~~~~~~~~~~~~~~~~~~~~
  161 |                     CURLFORM_END) != 0) {
      |                     ~~~~~~~~~~~~~
In file included from external/curlcpplib/include/curl_form.h:29,
                 from external/curlcpplib/src/curl_form.cpp:7:
external/curlcpplib/backends/curl-7.87.0/include/curl/curl.h:2570:1: note: declared here
 2570 | curl_formadd(struct curl_httppost **httppost,
      | ^~~~~~~~~~~~