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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 --- - IR linking and COMDAT constraints"
href="https://llvm.org/bugs/show_bug.cgi?id=24847">24847</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>IR linking and COMDAT constraints
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>3.7
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Windows NT
</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>russell.wallace@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>Created <span class=""><a href="attachment.cgi?id=14888" name="attach_14888" title="The linked .ll file">attachment 14888</a> <a href="attachment.cgi?id=14888&action=edit" title="The linked .ll file">[details]</a></span>
The linked .ll file
When I use clang on Windows to compile a program using regular expressions to
intermediate code, then run the result through llvm-link and finally try to
generate an executable, I get an error.
All of these ingredients are necessary; it works if the program doesn't use
regular expressions, and it works if I compile it directly instead of going via
intermediate code.
The use of the exact llvm-link binary, however, is not a necessary ingredient;
I get the same result with a linking program of my own that uses the same
libraries as llvm-link.
Minimal test case:
C:\test>type test.cpp
#include <regex>
int main() {
std::cmatch m;
regex_match("a", m, std::regex("a"));
return 0;
}
C:\test>clang-cl -Xclang -emit-llvm -c -fms-compatibility-version=19 test.cpp
C:\test>move test.obj test.ll
Overwrite C:\test\test.ll? (Yes/No/All): y
1 file(s) moved.
C:\test>llvm-link test.ll -o=a.ll
C:\test>clang-cl -Wno-override-module a.ll
a-e22d14.obj : fatal error LNK1243: invalid or corrupt file: COMDAT section
0x373 associated with following section 0x389
clang-cl.exe: error: linker command failed with exit code 1243 (use -v to see
invocation)</pre>
</div>
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