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<base href="https://llvm.org/bugs/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - --start-lib/--end-lib broken with LTO"
href="https://llvm.org/bugs/show_bug.cgi?id=26674">26674</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>--start-lib/--end-lib broken with LTO
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</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>Linker
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>eugeni.stepanov@gmail.com
</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>$ cat bin.cc
int main() {}
$ cat 1.cc
__attribute__((constructor(0))) void ctor() {}
$ ./bin/clang++ -flto bin.cc -c
$ ./bin/clang++ -flto 1.cc -c
$ ./bin/clang++ -fuse-ld=gold -flto bin.o -Wl,--start-lib 1.o -Wl,--end-lib
/tmp/lto-llvm-2af7ce.o(.init_array.0+0x0): error: undefined reference to
'ctor()'
clang-3.9: error: linker command failed with exit code 1 (use -v to see
invocation)
With -Wl,-plugin-opt,save-temps the merged IR (before link time optimizations)
looks like this:
[...]
@llvm.global_ctors = appending global [1 x { i32, void ()*, i8* }] [{ i32, void
()*, i8* } { i32 0, void ()* @_Z4ctorv, i8* null }]
; Function Attrs: norecurse nounwind uwtable
define i32 @main() #0 {
entry:
ret i32 0
}
; Function Attrs: nounwind uwtable
declare void @_Z4ctorv() #1
[...]
$ /usr/bin/ld.gold --version
GNU gold (GNU Binutils for Ubuntu 2.24) 1.11</pre>
</div>
</p>
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