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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - static __thread T* ptr(0); error: initializer for thread-local variable must be a constant expression (while T* ptr = 0 will work)"
href="http://llvm.org/bugs/show_bug.cgi?id=21690">21690</a>
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<th>Summary</th>
<td>static __thread T* ptr(0); error: initializer for thread-local variable must be a constant expression (while T* ptr = 0 will work)
</td>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Frontend
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>david.abdurachmanov@gmail.com
</td>
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
</td>
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<p>
<div>
<pre>I bumped Clang to pre-3.6 (65d8b4c4998b3a0c20934ea72ede72ef4838a004, r222081,
~15 Nov). Have not checked the trunk version.
$ cat test.cc
template <typename T>
void dummy() {
static __thread T* ptr(0);
}
$ clang++ -std=c++11 test.cc
test.cc:3:25: error: initializer for thread-local variable must be a constant
expression
static __thread T* ptr(0);
^~~
test.cc:3:22: note: use 'thread_local' to allow this
static __thread T* ptr(0);
^
1 error generated.
The following will work:
static __thread T* ptr;
static __thread T* ptr = 0;
static __thread T* ptr = nullptr;
static thread_local T* ptr(nullptr);
The following will not work:
static __thread T* ptr{0};
static __thread T* ptr(0);
It works with c-like initialization, but not with constructor initialization or
uniform initialization.
We are assigning initial value of pointer (nullptr), isn't nullptr/0 are
constant expression here?</pre>
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