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packages/lang/python/python3/patches/026-bpo-34585-run-autoconf-GH-9411.patch
Jeffery To ad50eb7c0a python3: Fix float byte order detection 
This backports patches from bpo-34585[1] to fix byte order detection of
floats.

Fixing byte order detection allows the repr() of floats to be
shorter[2]. sys.float_repr_style should be 'short' instead of 'legacy'
on supported platforms.

See #11134.

[1]: https://bugs.python.org/issue34585
[2]: https://docs.python.org/3.8/whatsnew/3.1.html#other-language-changes

Signed-off-by: Jeffery To <jeffery.to@gmail.com>
2020-01-30 19:12:25 +08:00

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From b3b8cb419e496629873fa7dda82a01863f58617a Mon Sep 17 00:00:00 2001
From: Benjamin Peterson <benjamin@python.org>
Date: Tue, 18 Sep 2018 23:49:05 -0700
Subject: [PATCH] run autoconf (GH-9411)
Follow up to 2a9c3805ddedf282881ef7811a561c70b74f80b1 (bpo-34585).
---
aclocal.m4 | 1 +
configure | 146 ++++++++++++++++----------------------------------
pyconfig.h.in | 4 ++
3 files changed, 51 insertions(+), 100 deletions(-)
diff --git a/aclocal.m4 b/aclocal.m4
index 6a24d8e6b9c00..030e6877de9f7 100644
--- a/aclocal.m4
+++ b/aclocal.m4
@@ -288,4 +288,5 @@ AS_VAR_COPY([$1], [pkg_cv_][$1])
AS_VAR_IF([$1], [""], [$5], [$4])dnl
])dnl PKG_CHECK_VAR
+m4_include([m4/ax_c_float_words_bigendian.m4])
m4_include([m4/ax_check_openssl.m4])
diff --git a/configure b/configure
index 7b0c734b5e25e..38546d6ca7b40 100755
--- a/configure
+++ b/configure
@@ -13853,131 +13853,77 @@ fi
# * Check for various properties of floating point *
# **************************************************
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether C doubles are little-endian IEEE 754 binary64" >&5
-$as_echo_n "checking whether C doubles are little-endian IEEE 754 binary64... " >&6; }
-if ${ac_cv_little_endian_double+:} false; then :
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether float word ordering is bigendian" >&5
+$as_echo_n "checking whether float word ordering is bigendian... " >&6; }
+if ${ax_cv_c_float_words_bigendian+:} false; then :
$as_echo_n "(cached) " >&6
else
-if test "$cross_compiling" = yes; then :
- ac_cv_little_endian_double=no
-else
- cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+
+ax_cv_c_float_words_bigendian=unknown
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
-#include <string.h>
-int main() {
- double x = 9006104071832581.0;
- if (memcmp(&x, "\x05\x04\x03\x02\x01\xff\x3f\x43", 8) == 0)
- return 0;
- else
- return 1;
-}
-_ACEOF
-if ac_fn_c_try_run "$LINENO"; then :
- ac_cv_little_endian_double=yes
-else
- ac_cv_little_endian_double=no
-fi
-rm -f core *.core core.conftest.* gmon.out bb.out conftest$ac_exeext \
- conftest.$ac_objext conftest.beam conftest.$ac_ext
-fi
+double d = 90904234967036810337470478905505011476211692735615632014797120844053488865816695273723469097858056257517020191247487429516932130503560650002327564517570778480236724525140520121371739201496540132640109977779420565776568942592.0;
-fi
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_little_endian_double" >&5
-$as_echo "$ac_cv_little_endian_double" >&6; }
-if test "$ac_cv_little_endian_double" = yes
-then
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
-$as_echo "#define DOUBLE_IS_LITTLE_ENDIAN_IEEE754 1" >>confdefs.h
+if grep noonsees conftest.$ac_objext >/dev/null ; then
+ ax_cv_c_float_words_bigendian=yes
+fi
+if grep seesnoon conftest.$ac_objext >/dev/null ; then
+ if test "$ax_cv_c_float_words_bigendian" = unknown; then
+ ax_cv_c_float_words_bigendian=no
+ else
+ ax_cv_c_float_words_bigendian=unknown
+ fi
fi
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether C doubles are big-endian IEEE 754 binary64" >&5
-$as_echo_n "checking whether C doubles are big-endian IEEE 754 binary64... " >&6; }
-if ${ac_cv_big_endian_double+:} false; then :
- $as_echo_n "(cached) " >&6
-else
-
-if test "$cross_compiling" = yes; then :
- ac_cv_big_endian_double=no
-else
- cat confdefs.h - <<_ACEOF >conftest.$ac_ext
-/* end confdefs.h. */
-
-#include <string.h>
-int main() {
- double x = 9006104071832581.0;
- if (memcmp(&x, "\x43\x3f\xff\x01\x02\x03\x04\x05", 8) == 0)
- return 0;
- else
- return 1;
-}
-_ACEOF
-if ac_fn_c_try_run "$LINENO"; then :
- ac_cv_big_endian_double=yes
-else
- ac_cv_big_endian_double=no
fi
-rm -f core *.core core.conftest.* gmon.out bb.out conftest$ac_exeext \
- conftest.$ac_objext conftest.beam conftest.$ac_ext
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ax_cv_c_float_words_bigendian" >&5
+$as_echo "$ax_cv_c_float_words_bigendian" >&6; }
-fi
+case $ax_cv_c_float_words_bigendian in
+ yes)
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_big_endian_double" >&5
-$as_echo "$ac_cv_big_endian_double" >&6; }
-if test "$ac_cv_big_endian_double" = yes
-then
+$as_echo "#define FLOAT_WORDS_BIGENDIAN 1" >>confdefs.h
+ ;;
+ no)
+ ;;
+ *)
+ as_fn_error $? "
-$as_echo "#define DOUBLE_IS_BIG_ENDIAN_IEEE754 1" >>confdefs.h
+Unknown float word ordering. You need to manually preset
+ax_cv_c_float_words_bigendian=no (or yes) according to your system.
-fi
+ " "$LINENO" 5 ;;
+esac
-# Some ARM platforms use a mixed-endian representation for doubles.
-# While Python doesn't currently have full support for these platforms
-# (see e.g., issue 1762561), we can at least make sure that float <-> string
-# conversions work.
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether C doubles are ARM mixed-endian IEEE 754 binary64" >&5
-$as_echo_n "checking whether C doubles are ARM mixed-endian IEEE 754 binary64... " >&6; }
-if ${ac_cv_mixed_endian_double+:} false; then :
- $as_echo_n "(cached) " >&6
-else
-if test "$cross_compiling" = yes; then :
- ac_cv_mixed_endian_double=no
-else
- cat confdefs.h - <<_ACEOF >conftest.$ac_ext
-/* end confdefs.h. */
+if test "$ax_cv_c_float_words_bigendian" = "yes"
+then
-#include <string.h>
-int main() {
- double x = 9006104071832581.0;
- if (memcmp(&x, "\x01\xff\x3f\x43\x05\x04\x03\x02", 8) == 0)
- return 0;
- else
- return 1;
-}
+$as_echo "#define DOUBLE_IS_BIG_ENDIAN_IEEE754 1" >>confdefs.h
-_ACEOF
-if ac_fn_c_try_run "$LINENO"; then :
- ac_cv_mixed_endian_double=yes
-else
- ac_cv_mixed_endian_double=no
-fi
-rm -f core *.core core.conftest.* gmon.out bb.out conftest$ac_exeext \
- conftest.$ac_objext conftest.beam conftest.$ac_ext
-fi
+elif test "$ax_cv_c_float_words_bigendian" = "no"
+then
-fi
+$as_echo "#define DOUBLE_IS_LITTLE_ENDIAN_IEEE754 1" >>confdefs.h
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_mixed_endian_double" >&5
-$as_echo "$ac_cv_mixed_endian_double" >&6; }
-if test "$ac_cv_mixed_endian_double" = yes
-then
+else
+ # Some ARM platforms use a mixed-endian representation for doubles.
+ # While Python doesn't currently have full support for these platforms
+ # (see e.g., issue 1762561), we can at least make sure that float <-> string
+ # conversions work.
+ # FLOAT_WORDS_BIGENDIAN doesnt actually detect this case, but if it's not big
+ # or little, then it must be this?
$as_echo "#define DOUBLE_IS_ARM_MIXED_ENDIAN_IEEE754 1" >>confdefs.h
diff --git a/pyconfig.h.in b/pyconfig.h.in
index 360f79994fafe..41e0479cad2e3 100644
--- a/pyconfig.h.in
+++ b/pyconfig.h.in
@@ -30,6 +30,10 @@
/* Define if --enable-ipv6 is specified */
#undef ENABLE_IPV6
+/* Define to 1 if your system stores words within floats with the most
+ significant word first */
+#undef FLOAT_WORDS_BIGENDIAN
+
/* Define if flock needs to be linked with bsd library. */
#undef FLOCK_NEEDS_LIBBSD
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