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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Add warning if array initializer contains less elements than declared"
href="https://llvm.org/bugs/show_bug.cgi?id=25599">25599</a>
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<th>Summary</th>
<td>Add warning if array initializer contains less elements than declared
</td>
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<th>Product</th>
<td>new-bugs
</td>
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<th>Version</th>
<td>unspecified
</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
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>new bugs
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>samjnaa@gmail.com
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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<th>Classification</th>
<td>Unclassified
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<p>
<div>
<pre>Consider this small program arr.c:
#include <stdio.h>
const int len = 3;
const char * arr[len] = {"a", "b", "c"};
int main() { for (int i = 0; i < len; ++i) printf("%c ", arr[i][0]);
putchar('\n'); }
If I include excess elements in the array:
const char * arr[len] = {"a", "b", "c", "d"};
Clang warns me though it is harmless:
$ clang -o arr arr.c && ./arr
arr.c:3:41: warning: excess elements in array initializer
const char * arr[len] = {"a", "b", "c", "d"};
^~~
1 warning generated.
a b c
But if there are less elements:
const char * arr[len] = {"a", "b"};
Clang doesn't warn me and it segfaults:
$ clang -o arr arr.c && ./arr
Segmentation fault (core dumped)
I realize it is the fault of the programmer to deref the pointer without
checking its validity, but the point of a warning is to be helpful, and so I
request that Clang may produce a warning in such cases.
Thanks.</pre>
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