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| author | Jérôme Pouiller <jezz@sysmic.org> | 2016-11-09 10:25:08 +0100 |
|---|---|---|
| committer | Thomas Petazzoni <thomas.petazzoni@free-electrons.com> | 2016-11-09 22:03:54 +0100 |
| commit | 7be691623a27087cc89c169e21466a0e66a75eb4 (patch) | |
| tree | 2b508d658c1a0c95ce3c7bd17324549111e4ea5a | |
| parent | 2a6001f17aba3f405f1aa95b3d95a553761d9b03 (diff) | |
| download | buildroot-7be691623a27087cc89c169e21466a0e66a75eb4.tar.gz buildroot-7be691623a27087cc89c169e21466a0e66a75eb4.zip | |
python3: fix double format detection
Python is not able to detect if compiler double representation is
compliant with IEE754:
checking whether C doubles are little-endian IEEE 754 binary64... no
checking whether C doubles are big-endian IEEE 754 binary64... no
checking whether C doubles are ARM mixed-endian IEEE 754 binary64... no
Accordingly 'legacy' mode isused. It is possible to check this at
runtime by check if 'sys.float_repr_style' contains 'short' or
'legacy'. Calculus correctness is not garanteed with 'legacy'.
Problem is better described here:
http://stackoverflow.com/questions/29920294/what-causes-pythons-float-repr-style-to-use-legacy
https://bugs.python.org/issue7117
However, all gcc architecture use a representation compliant with
IEE754. So, we can enable it unconditionnaly.
Signed-off-by: Jérôme Pouiller <jezz@sysmic.org>
[Thomas: rework condition to not use strip, as suggested by Baruch.]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
| -rw-r--r-- | package/python3/python3.mk | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/package/python3/python3.mk b/package/python3/python3.mk index b3f31c0aa0..f355ae9e6c 100644 --- a/package/python3/python3.mk +++ b/package/python3/python3.mk @@ -126,6 +126,13 @@ PYTHON3_CONF_ENV += \ ac_cv_working_tzset=yes \ ac_cv_prog_HAS_HG=/bin/false +# GCC is always compliant with IEEE754 +ifeq ($(BR2_ENDIAN),"LITTLE") +PYTHON3_CONF_ENV += ac_cv_little_endian_double=yes +else +PYTHON3_CONF_ENV += ac_cv_big_endian_double=yes +endif + # uClibc is known to have a broken wcsftime() implementation, so tell # Python 3 to fall back to strftime() instead. ifeq ($(BR2_TOOLCHAIN_USES_UCLIBC),y) |
