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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Const is not compile-time constant"
href="https://bugs.llvm.org/show_bug.cgi?id=44406">44406</a>
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<th>Summary</th>
<td>Const is not compile-time constant
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>unspecified
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<th>Hardware</th>
<td>All
</td>
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<th>OS</th>
<td>All
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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>C
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>mcccs@gmx.com
</td>
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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>const int a = 32;
typedef struct {
char c[a];
} d;
GCC: error: variably modified 'c' at file scope
CompCert: error: size of array is not a compile-time constant
Clang -Wextra: *compiles*
Clang -pedantic: warning: variable length array folded to constant array as an
extension [-Wgnu-folding-constant]
The problem? This is not a GNU extension. Either the warning is wrong or the
code that shouldn't compile compiles.
Weirdly, MSVC has the same behavior as Clang but does not issue a warning.
Once it is confirmed, I'll file an Apple bug report, because an Xcode header,
Security.framework/Headers/Authorization.h suffers from this issue and can only
be compiled with Clang (so when this bug is patched don't tell me that I broke
Apple's code :) )</pre>
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