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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Clang compiled with mingw-w64 emits available_externally for IsWindowsXPOrGreater()"
href="https://bugs.llvm.org/show_bug.cgi?id=39182">39182</a>
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<th>Summary</th>
<td>Clang compiled with mingw-w64 emits available_externally for IsWindowsXPOrGreater()
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>7.0
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Windows NT
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>LLVM Codegen
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>6yearold@gmail.com
</td>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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<p>
<div>
<pre>I've compiled release_70 branch with recent mingw-w64 toolchain (GCC 8.2.0) and
using produced Clang to compile following program:
#include <VersionHelpers.h>
#include <stdio.h>
int main(int argc, char* argv[])
{
IsWindowsXPOrGreater();
printf("OK\n");
return 0;
}
It fails on linking stage with "undefined reference to IsWindowsXPOrGreater".
When I use clang.exe from the official installer, it works fine.
I examined -S -emit-llvm output and found that my clang emits
define available_externally dso_local i32 @IsWindowsXPOrGreater {
...
}
while official clang emits
define linkonce_odr dso_local i32 @IsWindowsXPOrGreater {
...
}
Am I missing something, or it is a bug in Clang?
For reference, here is VersionHelpers.h source:
<a href="https://github.com/mirror/mingw-w64/blob/master/mingw-w64-headers/include/versionhelpers.h">https://github.com/mirror/mingw-w64/blob/master/mingw-w64-headers/include/versionhelpers.h</a></pre>
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