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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 - __attribute__((optnone)) not respected for included lambda"
href="https://bugs.llvm.org/show_bug.cgi?id=41343">41343</a>
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<th>Summary</th>
<td>__attribute__((optnone)) not respected for included lambda
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</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>
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<th>Component</th>
<td>C++
</td>
</tr>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>christian.weber@nokia.com
</td>
</tr>
<tr>
<th>CC</th>
<td>blitzrakete@gmail.com, dgregor@apple.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<p>
<div>
<pre>Test program test.cpp:
template <typename T>
class Test
{
public:
Test(){init();}
template <typename U>
int doThis(){return 10;};
template <typename U>
int doThat(){return 10;};
private:
void init() __attribute__((optnone));
};
template <typename T>
void Test<T>::init()
{
[&](){this->template doThis<int>();}();
this->template doThat<int>();
};
int main()
{
Test<bool> test;
}
clang -O3 test.cpp -c -o test.o
nm -C test.o
0000000000000000 T main
0000000000000000 W Test<bool>::init()
0000000000000000 W int Test<bool>::doThat<int>()
0000000000000000 W Test<bool>::init()::{lambda()#1}::operator()() const
I expect to see int Test<bool>::doThis<int>() in object file also.
Note: g++ 6.3.1a is not optimizing away the lambda function if
__attribute__((optnone))__ is replaced by __attribute__((optimize(0))) :
g++ -O3 test.cpp -c -o test_g++.o
nm -C test_g++.o
0000000000000000 T main
0000000000000000 W Test<bool>::init()
0000000000000000 t int Test<bool>::doThat<int>() [clone .isra.1]
0000000000000000 t int Test<bool>::doThis<int>() [clone .isra.0]
0000000000000000 W Test<bool>::init()::{lambda()#1}::operator()() const</pre>
</div>
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