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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - clang -fms-extensions accepts a wrong code"
href="https://bugs.llvm.org/show_bug.cgi?id=42176">42176</a>
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<th>Summary</th>
<td>clang -fms-extensions accepts a wrong code
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<th>Product</th>
<td>clang
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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
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>enhancement
</td>
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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>zhonghao@pku.org.cn
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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>My clang is clang version 9.0.0 (trunk 362565) (llvm/trunk 362564), and my code
is:
typedef struct a {} A;
void f() {
if (__builtin_alignof(A))
;
}
When compiling with clang++ -c -fms-extensions, it accepts the above code, but
clang++ rejects the code with other parameters. For example, with only -c, the
message is as follow:
4: error: unexpected type name 'A': expected expression
if (__builtin_alignof(A))
^
1 error generated.
Here, I tried g++, it also rejects the code:
: error: ‘__builtin_alignof’ was not declared in this scope; did you mean
‘__builtin_asinhf’?
4 | if (__builtin_alignof(A))
| ^~~~~~~~~~~~~~~~~
| __builtin_asinhf
So, with -fms-extensions, clang++ accepts wrong code?</pre>
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