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<base href="http://bugzilla.gdcproject.org/">
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Wrong gcc5 __builtin_OPNAME_overflow signatures."
href="http://bugzilla.gdcproject.org/show_bug.cgi?id=206">206</a>
</td>
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<th>Summary</th>
<td>Wrong gcc5 __builtin_OPNAME_overflow signatures.
</td>
</tr>
<tr>
<th>Product</th>
<td>GDC
</td>
</tr>
<tr>
<th>Version</th>
<td>development
</td>
</tr>
<tr>
<th>Hardware</th>
<td>All
</td>
</tr>
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<th>OS</th>
<td>All
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>Normal
</td>
</tr>
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<th>Component</th>
<td>gdc
</td>
</tr>
<tr>
<th>Assignee</th>
<td>ibuclaw@gdcproject.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>art.08.09@gmail.com
</td>
</tr></table>
<p>
<div>
<pre>For example:
<span class="quote">> import gcc.builtins;
> pragma(msg, typeof(__builtin_add_overflow));</span >
->
pure nothrow @nogc @safe extern (C) bool()
Which makes them unusable from D.
---------------------------------------------
void bug() {
int r;
__builtin_add_overflow(1, 2, &r);
}
---------------------------------------------
->
error: function gcc.builtins.__builtin_add_overflow () is not callable using
argument types (int, int, int*)
They do work if the type is overridden; ie this hack works:
@trusted bool overflow(string OP, A, B, R)(A a, B b, R* r) {
import gcc.builtins;
auto baofp = cast(typeof(&overflow))&mixin("__builtin_"~OP~"_overflow");
return (*baofp)(a, b, r);
}
if (overflow!"add"(a, b, &r))
error();</pre>
</div>
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