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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Crash given weak symbol in C, normal symbol in inline assembly"
href="https://bugs.llvm.org/show_bug.cgi?id=43187">43187</a>
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<th>Summary</th>
<td>Crash given weak symbol in C, normal symbol in inline assembly
</td>
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<th>Product</th>
<td>libraries
</td>
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<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>Backend: X86
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>jonathanchesterfield@gmail.com
</td>
</tr>
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<th>CC</th>
<td>craig.topper@gmail.com, llvm-bugs@lists.llvm.org, llvm-dev@redking.me.uk, spatel+llvm@rotateright.com
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<p>
<div>
<pre>For example,
__attribute__((weak)) int x = 4;
__asm__(".type x,@object\n"
".data\n"
".p2align 2\n"
"x:\n"
".long 42\n");
=> fatal error: error in backend: symbol 'x' is already defined
or, equivalently:
module asm ".type x,@object"
module asm ".data"
module asm ".p2align 2"
module asm "x:"
module asm ".long 42"
@x = weak dso_local global i32 4, align 4
=> same error
Expected behaviour is for x to have the initial value 42, replacing the weak
symbol. Observed behaviour is the fatal error.
Using non-inline assembly works as expected. Symbol overridden, no error.
Weak on either (or both) symbol(s) shows the same behaviour.
Non-reduced case has inline assembly in one translation unit and the weak
symbol in another. Compiling each separately to an elf and linking works fine,
llvm-link then llc fails as above.</pre>
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