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<body><span class="vcard"><a class="email" href="mailto:jonathan.sauer@gmx.de" title="jonathan.sauer@gmx.de">jonathan.sauer@gmx.de</a>
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<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED WORKSFORME - clang: Re-declaration of a local variable inside a for-loop is allowed"
href="http://llvm.org/bugs/show_bug.cgi?id=18787">bug 18787</a>
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<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>What</th>
<th>Removed</th>
<th>Added</th>
</tr>
<tr>
<td style="text-align:right;">Status</td>
<td>NEW
</td>
<td>RESOLVED
</td>
</tr>
<tr>
<td style="text-align:right;">CC</td>
<td>
</td>
<td>jonathan.sauer@gmx.de
</td>
</tr>
<tr>
<td style="text-align:right;">Resolution</td>
<td>---
</td>
<td>WORKSFORME
</td>
</tr></table>
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<div>
<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED WORKSFORME - clang: Re-declaration of a local variable inside a for-loop is allowed"
href="http://llvm.org/bugs/show_bug.cgi?id=18787#c4">Comment # 4</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED WORKSFORME - clang: Re-declaration of a local variable inside a for-loop is allowed"
href="http://llvm.org/bugs/show_bug.cgi?id=18787">bug 18787</a>
from <span class="vcard"><a class="email" href="mailto:jonathan.sauer@gmx.de" title="jonathan.sauer@gmx.de">jonathan.sauer@gmx.de</a>
</span></b>
<pre>gcc 4.2.1 doesn't complain when specifying C99 as the standard (-std=c99). In
C89 (-std=c89) it (correctly) complains about "redeclaration of ‘i’ with no
linkage", because in C89 the definitions in the first clause of a for statement
are in the surrounding scope instead of the loop body's scope.
clang also complains when using C89:
% ~/LLVM/build/Release+Asserts/bin/clang -std=c89 clang.c
clang.c:5:14: error: redefinition of 'i'
for (int i = 0; i < 100; ++i) { }
^
clang.c:3:9: note: previous definition is here
int i;
^
1 error generated.
I guess gcc and clang use different C standards as default, which is why you
got the differing results.</pre>
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