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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Unhelpful diagnostics upon unknown function-like macro invocation"
href="https://llvm.org/bugs/show_bug.cgi?id=23431">23431</a>
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<th>Summary</th>
<td>Unhelpful diagnostics upon unknown function-like macro invocation
</td>
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<th>Product</th>
<td>clang
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
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<th>OS</th>
<td>Linux
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>C++
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>stephan.bergmann.secondary@googlemail.com
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<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
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<p>
<div>
<pre><span class="quote">> $ cat test.cc
> void f() { M("" << ""); }</span >
>
<span class="quote">> $ clang++ -fsyntax-only test.cc
> test.cc:1:17: error: invalid operands to binary expression ('const char *' and 'const char *')
> void f() { M("" << ""); }
> ~~ ^ ~~
> 1 error generated.</span >
doesn't mention at all that M is unknown, and if M is e.g. defined as
#define M(x) std::cout << x
then the provided diagnostics is kind of a red herring. (Happens in practice,
cf. e.g.,
<<a href="http://cgit.freedesktop.org/libreoffice/core/commit/?id=c47f7dfb3045b7b029859ea1fac80143b996945b">http://cgit.freedesktop.org/libreoffice/core/commit/?id=c47f7dfb3045b7b029859ea1fac80143b996945b</a>>.)</pre>
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