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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Feature request: do not assume size of struct with flexible array member"
href="https://bugs.llvm.org/show_bug.cgi?id=37242">37242</a>
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<th>Summary</th>
<td>Feature request: do not assume size of struct with flexible array member
</td>
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<th>Product</th>
<td>clang
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<th>Version</th>
<td>unspecified
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<th>Hardware</th>
<td>Other
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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
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>Frontend
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>vicencb@gmail.com
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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<pre>Hi
It would be nice to have a new option in clang (e.g.: -Wno-assume-size) that
reports a warning each time it needs to assume the size of a variable of
unknown size.
For example, the following code
struct strc { int a; int b[]; };
struct strc array_of_var_unknown_size[10];
struct strc *ptr1_to_var_unknown_size = array_of_var_unknown_size + 1;
struct strc *ptr2_to_var_unknown_size = array_of_var_unknown_size + 3;
unsigned diff = ptr2_to_var_unknown_size - ptr1_to_var_unknown_size;
should generate 4 of such warnings.
This would be useful for catching errors when dealing with structs which
contain a flexible array member.
Regards,
Vicente.</pre>
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