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<base href="http://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - llvm build with -flto installs libclang_rt.* archives that contain bitcode"
href="http://llvm.org/bugs/show_bug.cgi?id=18279">18279</a>
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<th>Summary</th>
<td>llvm build with -flto installs libclang_rt.* archives that contain bitcode
</td>
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<th>Product</th>
<td>compiler-rt
</td>
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<th>Version</th>
<td>unspecified
</td>
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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>normal
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>compiler-rt
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>octoploid@yandex.com
</td>
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
</td>
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<p>
<div>
<pre>When llvm is build with -flto installs libclang_rt.* archives that contain
bitcode.
For example:
markus@x4 ~ % clang -fsanitize=undefined -O2 -g un.c
/usr/lib64/gcc/x86_64-pc-linux-gnu/4.9.0/../../../../x86_64-pc-linux-gnu/bin/ld:
error: /usr/local/bin/../lib/clang/3.4/lib/linux/libclang_rt.san-x86_64.a:
member at 812 is not an ELF object
/usr/lib64/gcc/x86_64-pc-linux-gnu/4.9.0/../../../../x86_64-pc-linux-gnu/bin/ld:
error: /usr/local/bin/../lib/clang/3.4/lib/linux/libclang_rt.san-x86_64.a:
member at 44656 is not an ELF object
...
un.c:3: error: undefined reference to '__ubsan_handle_shift_out_of_bounds'
clang-3.4: error: linker command failed with exit code 1 (use -v to see
invocation)
(-flto works fine, because it enables the linker plugin:)
markus@x4 ~ % clang -flto -fsanitize=undefined -O2 -g un.c
markus@x4 ~ %
(enabling the linker plugin by hang also works:)
markus@x4 ~ % clang -Wl,-plugin /usr/local/bin/../lib/LLVMgold.so
-Wl,-plugin-opt=mcpu=x86-64 -fsanitize=undefined -O2 -g un.c
markus@x4 ~ %
One solution would be to always disable -flto for compiler-rt during the build.
Another one to enable the linker plugin by default for -flto builds in general.</pre>
</div>
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