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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - fatal error: error in backend: 'main' label emitted multiple times to assembly file"
href="https://bugs.llvm.org/show_bug.cgi?id=46332">46332</a>
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<th>Summary</th>
<td>fatal error: error in backend: 'main' label emitted multiple times to assembly file
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>7.0
</td>
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<th>Hardware</th>
<td>Other
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>enhancement
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>C
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
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<th>Reporter</th>
<td>rspoerri@yuhsbstudents.org
</td>
</tr>
<tr>
<th>CC</th>
<td>blitzrakete@gmail.com, dgregor@apple.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<pre>I was doing some evil things in C, and I wrote the following code:
asm("main:");
int main() {
return 0;
}
I compiled it:
$ clang-7 -pthread -lm -o main main.c
fatal error: error in backend: 'main' label emitted multiple
times to assembly file
clang-7: error: clang frontend command failed with exit code 70 (use -v to see
invocation)
clang version 7.0.0 (<a href="mailto:git@github.com">git@github.com</a>:apple/swift-clang.git
5c9d04dc0697297a47b5edb0c1a581b306a42bdb) (<a href="mailto:git@github.com">git@github.com</a>:apple/swift-llvm.git
34250a6eef79ee8a83c5cfb4deb1583176dcbb63)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/bin
clang-7: note: diagnostic msg: PLEASE submit a bug report to
<a href="https://bugs.llvm.org/">https://bugs.llvm.org/</a> and include the crash backtrace, preprocessed source,
and associated run script.
clang-7: note: diagnostic msg:
********************
PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang-7: note: diagnostic msg: /tmp/main-e9d39a.c
clang-7: note: diagnostic msg: /tmp/main-e9d39a.sh
clang-7: note: diagnostic msg:
********************
compiler exit status 70
However, when I did:
asm("x:x:");
int main() {
return 0;
}
I got a normal, external error:
$ clang-7 -pthread -lm -o main main.c
<inline asm>:1:3: error: invalid symbol redefinition
x:x:
^
1 error generated.
compiler exit status 1</pre>
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