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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - clang rejects valid code that uses _Atomic"
href="https://bugs.llvm.org/show_bug.cgi?id=49398">49398</a>
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<th>Summary</th>
<td>clang rejects valid code that uses _Atomic
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<th>Product</th>
<td>clang
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<th>Version</th>
<td>trunk
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<th>Hardware</th>
<td>PC
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<th>OS</th>
<td>Linux
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>normal
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>C
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>alastair.donaldson@imperial.ac.uk
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<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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<pre>Created <span class=""><a href="attachment.cgi?id=24582" name="attach_24582" title="Valid C program that clang rejects">attachment 24582</a> <a href="attachment.cgi?id=24582&action=edit" title="Valid C program that clang rejects">[details]</a></span>
Valid C program that clang rejects
Command (where ex.c is the attached file):
clang -std=c17 -c ex.c
LLVM revision from which clang was built:
493f1407927cdf6db2e08f150ed9f9b8abe4ac45
Expected behaviour: the program should compile successfully.
Actual behaviour: clang gives this error:
ex.c:3:7: error: initializing 'int' with an expression of incompatible type
'_Atomic(int)'
The program is successfully compiled by gcc 9.3.0.
The program in the attached file is:
void foo() {
_Atomic int x;
int y = (x = 2);
}
which I believe is valid: it's fine to initialize a non-atomic int using an
atomic int.
If the declaration of y is changed to:
int y = x;
then the program compiles successfully.</pre>
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