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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - static_assert does not respect new-lines"
href="https://llvm.org/bugs/show_bug.cgi?id=26225">26225</a>
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<th>Summary</th>
<td>static_assert does not respect new-lines
</td>
</tr>
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<th>Product</th>
<td>new-bugs
</td>
</tr>
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<th>Version</th>
<td>unspecified
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>All
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>new bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
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</tr>
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<th>Reporter</th>
<td>metaprogrammingtheworld@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>This may or may not be considered a bug -- when a static_assert message
contains a '\n' character, the text "\n" is currently printed as opposed to an
actual new line. This is more unfortunate than it might seem because spacing
and new lines in static_assert messages can greatly improve the readability of
user-provided error messages.
Notably, GCC prints an actual new line when the new-line character is
encountered.
Example:
////////////////////
static_assert(false,
"\n****************************************\n"
"Error: The third macro argument that was "
"provided to FOO is invalid (it was not parenthesized). Saw:\n"
"std::array<int, 5>\n"
"Did you mean:\n"
"(std::array<int, 5>)"
"\n****************************************\n");
int main() {}
////////////////////
In GCC, this nicely prints:
1 : error: static assertion failed:
****************************************
Error: The third macro argument that was provided to FOO is invalid (it was not
parenthesized). Saw:
std::array<int, 5>
Did you mean:
(std::array<int, 5>)
****************************************
While in Clang, this prints:
1 : error: static_assert failed
"\n****************************************\nError: The third macro argument
that was provided to FOO is invalid (it was not parenthesized).
Saw:\nstd::array<int, 5>\nDid you mean:\n(std::array<int,
5>)\n****************************************\n"</pre>
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</p>
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