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<body><span class="vcard"><a class="email" href="mailto:richard-llvm@metafoo.co.uk" title="Richard Smith <richard-llvm@metafoo.co.uk>"> <span class="fn">Richard Smith</span></a>
</span> changed
<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - clang fails to compile rstudio-0.98.1103/src/cpp/session/modules/SessionHTMLPreview.cpp against libc++"
href="https://llvm.org/bugs/show_bug.cgi?id=23307">bug 23307</a>
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<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>What</th>
<th>Removed</th>
<th>Added</th>
</tr>
<tr>
<td style="text-align:right;">Status</td>
<td>NEW
</td>
<td>RESOLVED
</td>
</tr>
<tr>
<td style="text-align:right;">CC</td>
<td>
</td>
<td>richard-llvm@metafoo.co.uk
</td>
</tr>
<tr>
<td style="text-align:right;">Resolution</td>
<td>---
</td>
<td>INVALID
</td>
</tr></table>
<p>
<div>
<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - clang fails to compile rstudio-0.98.1103/src/cpp/session/modules/SessionHTMLPreview.cpp against libc++"
href="https://llvm.org/bugs/show_bug.cgi?id=23307#c4">Comment # 4</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - clang fails to compile rstudio-0.98.1103/src/cpp/session/modules/SessionHTMLPreview.cpp against libc++"
href="https://llvm.org/bugs/show_bug.cgi?id=23307">bug 23307</a>
from <span class="vcard"><a class="email" href="mailto:richard-llvm@metafoo.co.uk" title="Richard Smith <richard-llvm@metafoo.co.uk>"> <span class="fn">Richard Smith</span></a>
</span></b>
<pre>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).</pre>
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