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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Add default include path and link libraries."
href="https://bugs.llvm.org/show_bug.cgi?id=43108">43108</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Add default include path and link libraries.
</td>
</tr>
<tr>
<th>Product</th>
<td>parallel STL
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</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>New
</td>
</tr>
<tr>
<th>Assignee</th>
<td>ldionne@apple.com
</td>
</tr>
<tr>
<th>Reporter</th>
<td>alexej.h@xiphos.de
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=22424" name="attach_22424" title="Build instructions for the LLVM toolchain.">attachment 22424</a> <a href="attachment.cgi?id=22424&action=edit" title="Build instructions for the LLVM toolchain.">[details]</a></span>
Build instructions for the LLVM toolchain.
When using a complete LLVM toolkit with ParallelSTL and TBB backend, you have
to add the include directory (always) and tbb library (when std::execution::par
is used) manually.
Since it is part of the standard library now, the include path should not be
added manually.
The '-ltbb' part is debatable and I totally understand why it can be a bad idea
to do it automatically.
Here is a minimal complete viable example:
// main.cpp
#include <algorithm>
#include <execution>
#include <iostream>
#include <mutex>
#include <vector>
int main() {
std::mutex mutex;
std::vector<int> v = { 0, 1, 2, 3, 4 };
std::for_each(std::execution::par, v.begin(), v.end(), [&](auto i) {
std::lock_guard lock(mutex);
std::cout << i << std::endl;
});
}
When compiled with 'clang++ main.cpp', the error is:
In file included from main.cpp:2:
In file included from /opt/llvm/bin/../include/c++/v1/algorithm:643:
/opt/llvm/bin/../include/c++/v1/memory:5594:13: fatal error: '__pstl_memory'
file not found
# include <__pstl_memory>
^~~~~~~~~~~~~~~
1 error generated.
When compiled with 'clang++ -I/opt/llvm/include main.cpp', the error is:
ld.lld: error: undefined symbol:
tbb::interface7::internal::isolate_within_arena(tbb::interface7::internal::delegate_base&,
long)
...
It only works when compiled with 'clang++ -I/opt/llvm/include main.cpp -ltbb'.
Build instructions for the LLVM toolchain (git commit 918246788) used to test
it in WSL (Ubuntu 18.04.3 LTS) are attached to this bug report.</pre>
</div>
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