Commit 3cba6b1 ("Use _Float16 for half conversions if available") added
support for using half-width float support in the compiler to perform
encoding operations, using the FLT16_MANT_DIG macro to check for
support on the given target.
However, on x86 GCC only supports this when SSE2 is enabled[1]. Unlike
clang and the other architectures where support for this is conditional,
GCC *does* define those macros even without SSE2 support, causing a
build failure:
In file included from cborencoder_float.c:29:
cborinternal_p.h: In function ‘encode_half’:
cborinternal_p.h:56:5: error: invalid conversion to type ‘_Float16’ without option ‘-msse2’
56 | _Float16 f = (_Float16)x;
| ^~~~~~~~
cborinternal_p.h: In function ‘decode_half’:
cborinternal_p.h:65:5: error: invalid conversion from type ‘_Float16’ without option ‘-msse2’
65 | return (float)f;
|
Work around this by additionally checking for this specific condition.
[1] https://gcc.gnu.org/onlinedocs/gcc/Half-Precision.html
Signed-off-by: Florian Larysch <fl@n621.de>
