<div dir="ltr"><div class="gmail_default"><font color="#555555">Linker should merge input .MIPS.options sections into the single output .MIPS.options section. Now it works if '-r' is not specified. It's interesting that both bfd and gold linkers have a bug. In case of '-r' option they just concatenate input .MIPS.options sections one by one.</font></div><div class="gmail_extra"><br></div><div class="gmail_extra"><div class="gmail_default" style="font-family:'courier new',monospace">By the way now LLD does not support '-r' for MIPS by this and some other more important reasons.</div><br></div><div class="gmail_extra"><div class="gmail_default" style="font-family:'courier new',monospace">Simon</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, May 25, 2016 at 6:51 PM, Rui Ueyama <span dir="ltr"><<a href="mailto:ruiu@google.com" target="_blank">ruiu@google.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;border-left-color:rgb(204,204,204);padding-left:1ex"><div dir="ltr">It crashes because a .MIPS.options input section has no output section. Simon, do you know what is the best way to handle that type of section for -r? Should we just copy .MIPS.options to output? What if there are two or more .MIPS.options input sections from multiple input object files?<br></div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, May 25, 2016 at 8:35 AM, via llvm-bugs <span dir="ltr"><<a href="mailto:llvm-bugs@lists.llvm.org" target="_blank">llvm-bugs@lists.llvm.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;border-left-color:rgb(204,204,204);padding-left:1ex">
<div><table border="1" cellspacing="0" cellpadding="8">
<tbody><tr>
<th>Bug ID</th>
<td><a title="NEW --- - lld segfault on relocatable link of test/ELF/Inputs/no-augmentation.o" href="https://llvm.org/bugs/show_bug.cgi?id=27878" target="_blank">27878</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>lld segfault on relocatable link of test/ELF/Inputs/no-augmentation.o
</td>
</tr>
<tr>
<th>Product</th>
<td>lld
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>FreeBSD
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>All Bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td><a href="mailto:unassignedbugs@nondot.org" target="_blank">unassignedbugs@nondot.org</a>
</td>
</tr>
<tr>
<th>Reporter</th>
<td><a href="mailto:emaste@freebsd.org" target="_blank">emaste@freebsd.org</a>
</td>
</tr>
<tr>
<th>CC</th>
<td><a href="mailto:llvm-bugs@lists.llvm.org" target="_blank">llvm-bugs@lists.llvm.org</a>
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></tbody></table>
<p>
</p><div>
<pre>Discovered while creating the test added in r270706.
% build-nodebug/bin/lldb build-debug/bin/ld.lld -- -r
tools/lld/test/ELF/Inputs/no-augmentation.o
(lldb) target create "build-debug/bin/ld.lld"
Current executable set to 'build-debug/bin/ld.lld' (x86_64).
(lldb) settings set -- target.run-args "-r"
"tools/lld/test/ELF/Inputs/no-augmentation.o"
(lldb) run
Process 60069 launching
Process 60069 launched: '/tank/emaste/src/llvm/build-debug/bin/ld.lld' (x86_64)
Process 60069 stopped
* thread #1: tid = 101148, 0x0000000000650bb2
ld.lld`lld::elf::SymbolTableSection<llvm::object::ELFType<(llvm::support::endianness)0,
true> >::writeLocalSymbols(this=0x0000000806858160, Buf=<no value available>) +
1090 at OutputSections.cpp:1332, stop reason = signal SIGSEGV: invalid address
(fault address: 0x8)
frame #0: 0x0000000000650bb2
ld.lld`lld::elf::SymbolTableSection<llvm::object::ELFType<(llvm::support::endianness)0,
true> >::writeLocalSymbols(this=0x0000000806858160, Buf=<no value available>) +
1090 at OutputSections.cpp:1332
1329 ESym->st_value = Body.Value;
1330 } else {
1331 const OutputSectionBase<ELFT> *OutSec = Section->OutSec;
-> 1332 ESym->st_shndx = OutSec->SectionIndex;
1333 ESym->st_value = OutSec->getVA() + Section->getOffset(Body);
1334 }
1335 ESym->st_name = P.second;
(lldb) bt
* thread #1: tid = 101148, 0x0000000000650bb2
ld.lld`lld::elf::SymbolTableSection<llvm::object::ELFType<(llvm::support::endianness)0,
true> >::writeLocalSymbols(this=0x0000000806858160, Buf=<no value available>) +
1090 at OutputSections.cpp:1332, stop reason = signal SIGSEGV: invalid address
(fault address: 0x8)
* frame #0: 0x0000000000650bb2
ld.lld`lld::elf::SymbolTableSection<llvm::object::ELFType<(llvm::support::endianness)0,
true> >::writeLocalSymbols(this=0x0000000806858160, Buf=<no value available>) +
1090 at OutputSections.cpp:1332
frame #1: 0x0000000000650750
ld.lld`lld::elf::SymbolTableSection<llvm::object::ELFType<(llvm::support::endianness)0,
true> >::writeTo(this=0x0000000806858160, Buf="") + 96 at
OutputSections.cpp:1310
frame #2: 0x0000000000778a51 ld.lld`(anonymous
namespace)::Writer<llvm::object::ELFType<(this=0x00007fffffffbfa0)0, true>
<span>>::writeSections() + 673 at Writer.cpp:1352</span>
frame #3: 0x00000000007725ee ld.lld`(anonymous
namespace)::Writer<llvm::object::ELFType<(this=0x00007fffffffbfa0)0, true>
<span>>::run() + 318 at Writer.cpp:233</span>
frame #4: 0x00000000007cd618 ld.lld`void
lld::elf::writeResult<llvm::object::ELFType<(llvm::support::endianness)0, true>
<span>>(Symtab=0x00007fffffffd680)0, true> >*) + 7208 at Writer.cpp:201</span>
frame #5: 0x00000000005538b7 ld.lld`void
lld::elf::LinkerDriver::link<llvm::object::ELFType<(llvm::support::endianness)0,
true> >(this=0x00007fffffffe168, Args=0x00007fffffffdc90) + 3175 at
Driver.cpp:521
frame #6: 0x00000000005451ad
ld.lld`lld::elf::LinkerDriver::main(this=0x00007fffffffe168,
ArgsArr=ArrayRef<const char *> @ 0x00007fffffffdec8) + 1709 at Driver.cpp:281
frame #7: 0x0000000000544a96 ld.lld`lld::elf::link(Args=ArrayRef<const char
*> @ 0x00007fffffffe3c0, Error=0x00000000048929e8) + 182 at Driver.cpp:49
frame #8: 0x0000000000452077 ld.lld`main(Argc=3, Argv=0x00007fffffffe500) +
231 at lld.cpp:106
frame #9: 0x0000000000451eaf ld.lld`_start(ap=<unavailable>,
cleanup=<unavailable>) + 367 at crt1.c:78 [opt]
(lldb)</pre>
</div>
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<br></blockquote></div><br></div>
</blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature">Simon Atanasyan</div>
</div></div>