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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - sqrt not considered constexpr"
href="https://bugs.llvm.org/show_bug.cgi?id=40216">40216</a>
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<th>Summary</th>
<td>sqrt not considered constexpr
</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>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>C++
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
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<th>Reporter</th>
<td>shachar@shemesh.biz
</td>
</tr>
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<th>CC</th>
<td>blitzrakete@gmail.com, dgregor@apple.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<pre>The following program:
#include <cmath>
static constexpr double GoldenRatio = (1 + sqrt(5.0)) / 2;
Compiles fine on g++. Clang++ does not compile it:
test.cpp:3:25: error: constexpr variable 'GoldenRatio' must be initialized by a
constant expression
static constexpr double GoldenRatio = (1 + sqrt(5.0)) / 2;
^ ~~~~~~~~~~~~~~~~~~~
test.cpp:3:44: note: non-constexpr function 'sqrt' cannot be used in a constant
expression
static constexpr double GoldenRatio = (1 + sqrt(5.0)) / 2;
^
/usr/include/x86_64-linux-gnu/bits/mathcalls.h:143:13: note: declared here
__MATHCALL (sqrt,, (_Mdouble_ __x));
^
1 error generated.
$ clang++ --version
clang version 7.0.0-3 (tags/RELEASE_700/final)
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin
Ran on Ubuntu 18.10
Preventing compilation of practicomp: <a href="https://github.com/practical/practicomp">https://github.com/practical/practicomp</a>.</pre>
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