[Bug 231293] devel/qt5-core: fails to build on armv7 after 5.11 update

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=231293

mikael.urankar at gmail.com changed:

           What    |Removed                     |Added
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                 CC|                            |mikael.urankar at gmail.com

--- Comment #3 from mikael.urankar at gmail.com ---
(In reply to Jan Beich from comment #1)

(__ARM_FP & 2) refers to half precision support [1]


gcc6 and gcc7 doesn't define __ARM_FP16_FORMAT_IEEE
gcc7 -dM -E - < /dev/null | grep __ARM_FP16_FORMAT_IEEE

but clang does:
cc -dM -E - < /dev/null | grep __ARM_FP16_FORMAT_IEEE
#define __ARM_FP16_FORMAT_IEEE 1


from [2]:
The __fp16 type denotes half-precision (16-bit) floating-point.
The recommended way to test for this hardware support is to test bit 1 in
__ARM_FP
and
If 16-bit floating-point is available, one of __ARM_FP16_FORMAT_IEEE and
__ARM_FP16_FORMAT_ALTERNATIVE will be defined to indicate the format in use

could it be a clang bug?


[1]
http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0774g/chr1383660321827.html
[2]
http://infocenter.arm.com/help/topic/com.arm.doc.ihi0053c/IHI0053C_acle_2_0.pdf

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