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<base href="https://llvm.org/bugs/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - LLD fails to link an obj using versioned symbols"
href="https://llvm.org/bugs/show_bug.cgi?id=31261">31261</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>LLD fails to link an obj using versioned symbols
</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>Linux
</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>ELF
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>mail+llvm@tzik.jp
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>LLD fails to handle a .symver hack done in gRPC.
<a href="https://chromium.googlesource.com/external/github.com/grpc/grpc/+/master/src/core/lib/support/wrap_memcpy.c">https://chromium.googlesource.com/external/github.com/grpc/grpc/+/master/src/core/lib/support/wrap_memcpy.c</a>
Here is a repro case:
----
$ cat > failcase.s <<EOF
.text
<a href="mailto:memcpy@GLIBC_2.2.5">memcpy@GLIBC_2.2.5</a> = memcpy
.globl main
.p2align 4, 0x90
.type main,@function
main:
callq» memcpy
retq
EOF
$ clang -fuse-ld=lld failcase.s
symbol <a href="mailto:memcpy@GLIBC_2.2.5">memcpy@GLIBC_2.2.5</a> has undefined version GLIBC_2.2.5
----
Or, in C.
----
$ cat > failcase.c <<EOF
__asm__(".symver memcpy,<a href="mailto:memcpy@GLIBC_2.2.5">memcpy@GLIBC_2.2.5</a>");
void* memcpy(void* dest, const void* src, unsigned long size);
void* foo(void* dest, const void* src, unsigned long size) {
return memcpy(dest, src, size);
}
int main(int argc, const char** argv) {
return 0;
}
EOF
$ clang -fuse-ld=lld failcase.c
symbol <a href="mailto:memcpy@GLIBC_2.2.5">memcpy@GLIBC_2.2.5</a> has undefined version GLIBC_2.2.5
----</pre>
</div>
</p>
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