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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - FLT16_MAX is defined but _Float16 is not supported: confused"
href="https://bugs.llvm.org/show_bug.cgi?id=52532">52532</a>
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<th>Summary</th>
<td>FLT16_MAX is defined but _Float16 is not supported: confused
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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
</td>
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<th>OS</th>
<td>Linux
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<th>Status</th>
<td>NEW
</td>
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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>pavel.morozkin@gmail.com
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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>Notes:
1. This may not be a bug. Just want to draw attention to it.
2. This may not be a bug in clang itself, but rather in the system / C standard
library headers. Feel free to move it.
This code:
#define __STDC_WANT_IEC_60559_TYPES_EXT__
#include <float.h>
#ifdef FLT16_MAX
_Float16 f16;
#endif
compiled with [1]:
clang -std=c11 -Wall -Wextra
leads to:
t0.c:4:1: error: _Float16 is not supported on this target
which is confusing because FLT16_MAX is defined.
Per IEC 60559 interchange and extended types [2] it seems that if FLT16_MAX is
defined, then _Float16 is supported. Otherwise, how to correctly determine at
compile time that _Float16 is supported?
Thanks for the attention.
[1] Version: clang trunk on linux on x86_64
[2] <a href="http://www.open-std.org/jtc1/sc22/wg14/www/docs/n2601.pdf">http://www.open-std.org/jtc1/sc22/wg14/www/docs/n2601.pdf</a></pre>
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