[LLVMbugs] [Bug 23307] clang fails to compile rstudio-0.98.1103/src/cpp/session/modules/SessionHTMLPreview.cpp against libc++

[bugzilla-daemon at llvm.org]

https://llvm.org/bugs/show_bug.cgi?id=23307

Richard Smith <richard-llvm at metafoo.co.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |richard-llvm at metafoo.co.uk
         Resolution|---                         |INVALID

--- Comment #4 from Richard Smith <richard-llvm at metafoo.co.uk> ---
Reduced self-contained testcase:

#include <string>
#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());
}

Fails with libc++, passes with libstdc++, fails with libstdc++ and
-D_GLIBCXX_CONCEPT_CHECKS (which makes it actually check that std::search is
not being abused in this way).

FWIW, libstdc++ is silently generating wrong code when its std::search is given
an input iterator (it assumes it can save the iterator position and backtrack).

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