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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/65861] libstdc++ is silently generating wrong code when its
 std::search is given an input iterator
Date: Mon, 06 Dec 2021 10:42:21 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D65861

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2021-12-06
             Status|RESOLVED                    |NEW
         Resolution|FIXED                       |---

--- Comment #11 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #10)
> GCC 10+ started to reject the code just the same as CLANG does.

Clang doesn't reject it, libc++ does. Clang with libstdc++ accepts it, and =
so
does GCC trunk (you just need some more headers for recent versions):

#include <string>
#include <streambuf>
#include <istream>
#include <iterator>
#include <algorithm>
void f(std::istream &s, std::string x) {
      std::istreambuf_iterator<char> eod;
      std::search(std::istreambuf_iterator<char>(s),
                  eod,
                  x.begin(),
                  x.end());
}

Reopened.=