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<body><span class="vcard"><a class="email" href="mailto:richard-llvm@metafoo.co.uk" title="Richard Smith <richard-llvm@metafoo.co.uk>"> <span class="fn">Richard Smith</span></a>
</span> changed
<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - Clang-cl: Preprocessor concatenate strings failure with colons"
href="https://llvm.org/bugs/show_bug.cgi?id=30588">bug 30588</a>
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<th>What</th>
<th>Removed</th>
<th>Added</th>
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<td style="text-align:right;">Status</td>
<td>NEW
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<td>RESOLVED
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<td style="text-align:right;">CC</td>
<td>
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<td>richard-llvm@metafoo.co.uk
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<td style="text-align:right;">Resolution</td>
<td>---
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<td>INVALID
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<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - Clang-cl: Preprocessor concatenate strings failure with colons"
href="https://llvm.org/bugs/show_bug.cgi?id=30588#c1">Comment # 1</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - Clang-cl: Preprocessor concatenate strings failure with colons"
href="https://llvm.org/bugs/show_bug.cgi?id=30588">bug 30588</a>
from <span class="vcard"><a class="email" href="mailto:richard-llvm@metafoo.co.uk" title="Richard Smith <richard-llvm@metafoo.co.uk>"> <span class="fn">Richard Smith</span></a>
</span></b>
<pre>Your code is incorrect. The token paste would form the invalid token
"A::B""::""C"; the MS preprocessor has a bug where it accepts such invalid
token pastes.
You have a couple of options here:
1) You can fix your code by removing the ##s:
#define M(O,P) #O ## "::" ## #P
2) You can pass -Wno-invalid-token-paste to Clang to disable the error; we will
then give the same incorrect result as MSVC.</pre>
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