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<base href="https://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - __ARM_NEON not defined for cross compiling"
href="https://llvm.org/bugs/show_bug.cgi?id=22936">22936</a>
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<th>Summary</th>
<td>__ARM_NEON not defined for cross compiling
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>3.6
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Frontend
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>yyc1992@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>It seems that `__ARM_NEON` is not defined by clang even when `-mfpu=neon` and
the correct target is used. This generate error when including `<arm_neon.h>`
but if I define `__ARM_NEON` manually, the program compiles and generate
correct code.
Native compiling on ARM seems to be fine.
Comparing to arm-linux-gnueabihf-gcc and native ARM clang, it seems that at
least `__ARM_NEON__` is also missing.
Cross compiling clang
```
% clang --target=arm-linux-gnueabihf -mfpu=neon -dM -E - < /dev/null | grep -i
neon
```
GCC
```
% arm-linux-gnueabihf-gcc -mfpu=neon -dM -E - < /dev/null | grep -i neon
#define __ARM_NEON_FP 4
#define __ARM_NEON__ 1
#define __ARM_NEON 1
```
Native clang
```
$ clang -dM -E - < /dev/null | grep -i neon
#define __ARM_NEON 1
#define __ARM_NEON__ 1
```
Example code (taken from stackoverflow)
```
#include <arm_neon.h>
void
runTest(const float vector[], float result[])
{
float32x4_t vA = vld1q_f32(vector);
vA = vmulq_f32(vA, vA);
vst1q_f32(result, vA);
}
```
A single line `#include <arm_neon.h>` is also enough to trigger the issue.
System:
clang 3.6.0 (and 3.5.0) from official ArchLinux x86_64 repo.</pre>
</div>
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