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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - ld.lld doesn't permit read-only relocations (-z text) as default compared to ld.bfd and ld.gold"
href="https://bugs.llvm.org/show_bug.cgi?id=49810">49810</a>
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<th>Summary</th>
<td>ld.lld doesn't permit read-only relocations (-z text) as default compared to ld.bfd and ld.gold
</td>
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<th>Product</th>
<td>lld
</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>ELF
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>axel.y.rivera@intel.com
</td>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org, smithp352@googlemail.com
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<pre>I noticed that lld doesn't allow to relocate read-only sections by default (-z
text), while ld.bfd and ld.gold does (-z notext). This behavior was mentioned
in the following changes: <a href="https://reviews.llvm.org/D30530">https://reviews.llvm.org/D30530</a> . This is the example
from the same code review but modified for 32bits.
test2> cat simple.s
foo:
.long foo
test2> llvm-mc -filetype=obj -triple=i386-pc-linux simple.s -o simple.o
test2> ld.lld -m elf_i386 simple.o -o simple -shared
ld.lld: error: can't create dynamic relocation R_386_32 against local symbol in
readonly segment; recompile object files with -fPIC or pass '-Wl,-z,notext' to
allow text relocations in the output
<span class="quote">>>> defined in simple.o
>>> referenced by simple.o:(.text+0x0)</span >
But it links successfully for ld.bfd and ld.gold:
test2> ld.bfd -m elf_i386 simple.o -o simple -shared
test2> ld.gold -m elf_i386 simple.o -o simple -shared
If I add -z text to ld.bfd and ld.gold then I get the same failure:
test2> ld.bfd -z text -m elf_i386 simple.o -o simple -shared
ld.bfd: simple.o: warning: relocation in read-only section `.text'
ld.bfd: read-only segment has dynamic relocations.
test2> ld.gold -z text -m elf_i386 simple.o -o simple -shared
ld.gold: error: read-only segment has dynamic relocations
As mentioned in the test case, I can use -z notext and link in lld:
test2> ld.lld -z notext -m elf_i386 simple.o -o simple -shared
Is there a reason why lld doesn't permit the relocation for read-only sections
by default compared to bfd and gold?</pre>
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