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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [X32] Wrong exception table generation"
href="https://bugs.llvm.org/show_bug.cgi?id=50148">50148</a>
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<th>Summary</th>
<td>[X32] Wrong exception table generation
</td>
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<th>Product</th>
<td>libraries
</td>
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<th>Version</th>
<td>trunk
</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>Backend: X86
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<th>Assignee</th>
<td>harald@gigawatt.nl
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<th>Reporter</th>
<td>harald@gigawatt.nl
</td>
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<th>CC</th>
<td>craig.topper@gmail.com, llvm-bugs@lists.llvm.org, llvm-dev@redking.me.uk, pengfei.wang@intel.com, spatel+llvm@rotateright.com
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<p>
<div>
<pre>$ clang++ --version
clang version 11.1.0
Target: x86_64-unknown-linux-gnux32
Thread model: posix
InstalledDir: /usr/bin
$ cat test.ii
class E {};
void f();
void g() throw(E) { f(); }
$ clang++ -mx32 -c -O2 test.ii
$ objdump -rj .gcc_except_table test.o
test.o: file format elf32-x86-64
RELOCATION RECORDS FOR [.gcc_except_table]:
OFFSET TYPE VALUE
00000010 R_X86_64_32 _ZTI1E
$ clang++ -mx32 -c -O2 -fPIC test.ii
$ objdump -rj .gcc_except_table test.o
test.o: file format elf32-x86-64
RELOCATION RECORDS FOR [.gcc_except_table]:
OFFSET TYPE VALUE
00000010 R_X86_64_PC64 .data
With -fPIC we suddenly have a 64-bit relocation. That's wrong and causes a
linker error later on.
The above is tested with LLVM 11 with various cherry-picked patches from LLVM
12, but this is still an issue on LLVM 12 and trunk as well. Reporting to make
sure I don't forget about it, assigning to myself.</pre>
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