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<base href="https://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - libc++ defines getline(istream, string) in <istream> instead of <string>"
href="https://llvm.org/bugs/show_bug.cgi?id=25232">25232</a>
</td>
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<tr>
<th>Summary</th>
<td>libc++ defines getline(istream, string) in <istream> instead of <string>
</td>
</tr>
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<th>Product</th>
<td>libc++
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>All
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>All Bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>nicolasweber@gmx.de
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, mclow.lists@gmail.com
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>This doesn't link:
$ cat test.cc
#include <iosfwd>
#include <string>
std::string f(std::istream& is) {
std::string s;
std::getline(is, s);
return s;
}
$ clang++ -shared test.cc -o libfoo.so
Undefined symbols for architecture x86_64:
"std::__1::basic_istream<char, std::__1::char_traits<char> >&
std::__1::getline<char, std::__1::char_traits<char>, std::__1::allocator<char>
<span class="quote">>(std::__1::basic_istream<char, std::__1::char_traits<char> >&,</span >
std::__1::basic_string<char, std::__1::char_traits<char>,
std::__1::allocator<char> >&)", referenced from:
f(std::__1::basic_istream<char, std::__1::char_traits<char> >&) in
test-935a1a.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
<a href="http://en.cppreference.com/w/cpp/string/basic_string/getline">http://en.cppreference.com/w/cpp/string/basic_string/getline</a> says that this
function should be in <string>. In libc++, it's declared in <string> but
defined in <istream>. If I add an `#include <istream>` to the file above, it
links fine.
<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - Define std::getline in <string>, not <istream>"
href="show_bug.cgi?id=10390">Bug 10390</a> added the declarations to <string>, but it seems that the definition
should be there too?
(I kind of feel that I filed this before and that someone explained to me why
this things are arguably correct as they are now, but I can't find anything
like that.)</pre>
</div>
</p>
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