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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Predefined __FLT16_MANT_DIG__ defined on targets that don't support _Float16"
href="https://bugs.llvm.org/show_bug.cgi?id=40559">40559</a>
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<th>Summary</th>
<td>Predefined __FLT16_MANT_DIG__ defined on targets that don't support _Float16
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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
</td>
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<th>Severity</th>
<td>enhancement
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>Frontend
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>nemanja.i.ibm@gmail.com
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
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<p>
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<pre>The Target Info has a query for whether the target supports the _Float16 type.
However, we are not considering that query and predefining __FLT16_MANT_DIG__
unconditionally since rC313152.
This can get us in trouble for some type_traits-like compilations.
Specifically, on PPC:
$ cat predef.c
#ifdef __FLT16_MANT_DIG__
_Float16 t;
#endif
int main(void) { return 5; }
$ clang predef.c -S
predef.c:2:1: error: _Float16 is not supported on this target
_Float16 t;
^
1 error generated.</pre>
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