Web lists-archives.com

GCC-6.4 sys/select.h build failures with std=c++14

I tried compiling a very simple program with curl using -std=c++14 under
64-bit cygwin with gcc 6.4.0. When compiling with just g++ main.cpp -lcurl
everything is fine, however if I try to use c++14 as the dialect (g++
main.cpp -lcurl -std=c++14) familiar problems creep up

In file included from /usr/include/curl/curl.h:2547:0,
                 from main.cpp:10:
/usr/include/curl/multi.h:155:40: error: ‘fd_set’ has not been declared
                                        fd_set *read_fd_set,
/usr/include/curl/multi.h:156:40: error: ‘fd_set’ has not been declared
                                        fd_set *write_fd_set,
/usr/include/curl/multi.h:157:40: error: ‘fd_set’ has not been declared
                                        fd_set *exc_fd_set,

This is resolved by manually including <sys/select.h> before including

This was discussed in the curl project in the past (
https://github.com/curl/curl/issues/749) where it was determined that it
was caused by a cygwin bug which was addressed in

If anyone has thoughts, I'd greatly appreciate it. Compiling the following
is sufficient to reproduce.

#include <iostream>
#include <curl/curl.h>

using namespace std;

int main() {

CURL *curl = curl_easy_init();
if(curl) {
  CURLcode res;
  curl_easy_setopt(curl, CURLOPT_URL, "http://example.com";);
  res = curl_easy_perform(curl);


Problem reports:       http://cygwin.com/problems.html
FAQ:                   http://cygwin.com/faq/
Documentation:         http://cygwin.com/docs.html
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple