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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 - Linker doesn't find _GLOBAL_OFFSET_TABLE_"
href="https://bugs.llvm.org/show_bug.cgi?id=39634">39634</a>
</td>
</tr>
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<th>Summary</th>
<td>Linker doesn't find _GLOBAL_OFFSET_TABLE_
</td>
</tr>
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<th>Product</th>
<td>lld
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Windows NT
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>ELF
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>ck@remobjects.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, peter.smith@linaro.org
</td>
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<p>
<div>
<pre>this bitcode:
------------------------------------------------
; ModuleID = 'prfail.bc'
source_filename = "prfail.c"
target datalayout = "e-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64"
target triple = "armv7-unknown-linux-gnueabihf"
@llvm.used = appending global [3 x i8*] [
i8* bitcast (void()* @__elements_entry_point_helper to i8*),
i8* bitcast (void()* @__elements_init to i8*),
i8* bitcast (void()* @__elements_fini to i8*)
], section "llvm.metadata"
; Function Attrs: noinline nounwind optnone
define dso_local void @_start() #0 {
call void asm sideeffect ".l4a:\0Aldr r0, .l1\0Aldr r0, [r0,
r4]\0Aldr r3, .l2\0Aldr r3, [r3, r4]\0Aldr r12, .l3\0Aldr r12,
[r12, r4]\0A.l1:\0A .long __elements_entry_point_helper(GOT)\0A.l2:\0A
.long __elements_init(GOT)\0A.l3:\0A .long __elements_fini(GOT)\0A.l4:\0A
.long _GLOBAL_OFFSET_TABLE_-(.l4a+8)\0A", ""()
ret void
}
define void @__elements_entry_point_helper() #0 {
ret void
}
define void @__elements_init() #0 {
ret void
}
define void @__elements_fini() #0 {
ret void
}
attributes #0 = { noinline nounwind optnone }
------------------------------------------------
error:
lld: error: undefined symbol: _GLOBAL_OFFSET_TABLE_
<span class="quote">>>> referenced by prfail.c
>>> lto.tmp:(_start)</span >
this fails:
opt prfail.ll -O2 -o pr.o
lld -flavor gnu "-dynamic-linker" "/lib/ld-linux-armhf.so.3" "-o" "a.out" pr.o
this works:
llc -O2 prfail.ll -filetype=obj -o pr.o
lld -flavor gnu "-dynamic-linker" "/lib/ld-linux-armhf.so.3" "-o" "a.out" pr.o
even though both should act the same (the only real difference is that 1 is
bitcode).
(There's a second issue that if llvm.used isn't there, it fails to find the 3
methods __elements_init,__elements_fini too __elements_entry_point_helper)</pre>
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