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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Symbol assignments within output sections are not relative to enclosing section"
href="https://bugs.llvm.org/show_bug.cgi?id=41169">41169</a>
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<th>Summary</th>
<td>Symbol assignments within output sections are not relative to enclosing section
</td>
</tr>
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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>enhancement
</td>
</tr>
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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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</tr>
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<th>Reporter</th>
<td>pkmx.tw@gmail.com
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org, peter.smith@linaro.org
</td>
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<p>
<div>
<pre>To reproduce:
$ cat > test.ld <<EOF
SECTIONS {
.foo 0x10000 : {
. = 4;
foo = .;
}
}
EOF
$ clang -xc - -o empty.o < /dev/null
$ ld.lld empty.o -Ttest.ld
ld.lld: error: test.ld:3: unable to move location counter backward for: .foo
ld.lld: error: section .foo at 0x10000 of size 0xFFFFFFFFFFFF0004 exceeds
available address space
It works with ld.bfd:
$ ld.bfd empty.o -Ttest.ld
$ readelf -s a.out | grep foo
4: 0000000000010004 0 NOTYPE GLOBAL DEFAULT 1 foo
---------------------------------
ld.bfd treats numbers in an output section as relative to the beginning of the
section
(<a href="https://sourceware.org/binutils/docs/ld/Expression-Section.html#Expression-Section">https://sourceware.org/binutils/docs/ld/Expression-Section.html#Expression-Section</a>),
so the assignment `. = 4` actually moves dot to 0x10004.
In lld, `. = 4` tries to move dot backwards to absolute address 4, which is not
allowed within an output section.</pre>
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