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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Link time error when using multiple builtin functions"
href="https://bugs.freedesktop.org/show_bug.cgi?id=99154">99154</a>
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<th>Summary</th>
<td>Link time error when using multiple builtin functions
</td>
</tr>
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<th>Product</th>
<td>Mesa
</td>
</tr>
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<th>Version</th>
<td>git
</td>
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<th>Hardware</th>
<td>Other
</td>
</tr>
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<th>OS</th>
<td>All
</td>
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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>medium
</td>
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<th>Component</th>
<td>glsl-compiler
</td>
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<th>Assignee</th>
<td>mesa-dev@lists.freedesktop.org
</td>
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<th>Reporter</th>
<td>niels_ole@salscheider-online.de
</td>
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<th>QA Contact</th>
<td>intel-3d-bugs@lists.freedesktop.org
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<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=128570" name="attach_128570" title="Simple test case">attachment 128570</a> <a href="attachment.cgi?id=128570&action=edit" title="Simple test case">[details]</a></span>
Simple test case
When using multiple builtin functions, linking of a shader can fail if
temporary variables of the GLSL compiler collide.
builtin_builder::binop creates variables named "x" and "y" for the parameters
of builtin functions. Later, ir_call::generate_inline inlines the call to the
builtins. It clones the variables (without changing the name) and assigns the
function inputs to them.
This can cause a collision of variable names, e. g. when using multiple builtin
functions with parameters of different types. The attached test case can be
used to reproduce the problem.
I can work around the problem by adding a sequence number and possibly a prefix
to the variable names but I am not sure if that is the correct solution.
Thanks to imirkin and robclark for helping me to figure this out on IRC.</pre>
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