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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - __cpp_lib_experimental_detect feature test macro not defined despite detection idiom API support"
href="https://bugs.llvm.org/show_bug.cgi?id=49173">49173</a>
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<th>Summary</th>
<td>__cpp_lib_experimental_detect feature test macro not defined despite detection idiom API support
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<th>Product</th>
<td>clang
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<th>Version</th>
<td>trunk
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<th>Hardware</th>
<td>PC
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>normal
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>-New Bugs
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>joeloser93@gmail.com
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<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
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<pre>It seems `__cpp_lib_experimental_detect` feature test macro is not defined in
Clang, despite support for detection idiom API as of November 2016
(<a href="https://lists.llvm.org/pipermail/cfe-commits/Week-of-Mon-20161121/178052.html">https://lists.llvm.org/pipermail/cfe-commits/Week-of-Mon-20161121/178052.html</a>)
Here is a simple Wandbox example
(<a href="https://wandbox.org/permlink/zZy9wvmFk1x4hLLj">https://wandbox.org/permlink/zZy9wvmFk1x4hLLj</a>) that shows the issue. Note that
GCC does define the feature test macro appropriately.</pre>
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