AC_LIBOBJ replacement of fileblocks

[rpetrov]

BPO	17603
Nosy	@vadmium
Files	0014-MINGW-AC_LIBOBJ-replacement-of-fileblocks.patch avoid-fileblocks.patch

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2016-03-17.06:23:07.738>
created_at = <Date 2013-03-31.20:13:39.386>
labels = ['build']
title = 'AC_LIBOBJ replacement of fileblocks'
updated_at = <Date 2016-03-17.06:23:07.723>
user = 'https://bugs.python.org/rpetrov'

bugs.python.org fields:

activity = <Date 2016-03-17.06:23:07.723>
actor = 'martin.panter'
assignee = 'none'
closed = True
closed_date = <Date 2016-03-17.06:23:07.738>
closer = 'martin.panter'
components = ['Build']
creation = <Date 2013-03-31.20:13:39.386>
creator = 'rpetrov'
dependencies = []
files = ['29636', '42123']
hgrepos = []
issue_num = 17603
keywords = ['patch']
message_count = 4.0
messages = ['185665', '261534', '261883', '261887']
nosy_count = 3.0
nosy_names = ['rpetrov', 'python-dev', 'martin.panter']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = None
status = 'closed'
superseder = None
type = 'compile error'
url = 'https://bugs.python.org/issue17603'
versions = ['Python 2.7', 'Python 3.5', 'Python 3.6']

[rpetrov]

split of bpo-3871 - actually this is not mingw* specific - it is for all platforms without fileblocks

[vadmium]

IMO this is a fault of the autowhatever configuration stuff, not just an enhancement. If configure.ac determines that there is no st_blocks field, it tries to link against a non-existant fileblocks.o file:

./mingw/Makefile:220:LIBOBJS= ${LIBOBJDIR}fileblocks$U.o
i486-mingw32-gcc: error: Python/fileblocks.o: No such file or directory

I am not really an autoconf or whatever expert, but it seems if you use a lower-level bit of configure.ac code it avoids the problem; see avoid-fileblocks.patch.

[python-dev]

New changeset acbeb33dc76a by Martin Panter in branch '2.7':
Issue bpo-17603: Check for st_blocks field without requiring fileblocks.o
https://hg.python.org/cpython/rev/acbeb33dc76a

New changeset 0774398c3433 by Martin Panter in branch '3.5':
Issue bpo-17603: Check for st_blocks field without requiring fileblocks.o
https://hg.python.org/cpython/rev/0774398c3433

New changeset 628bd1ebfa22 by Martin Panter in branch 'default':
Issue bpo-17603: Merge configure.ac fix from 3.5
https://hg.python.org/cpython/rev/628bd1ebfa22

[vadmium]

I assume that should have fixed the problem, but I have only tested it in roundabout ways, so it would be good to get confirmation if it helps e.g. the original Ming GW problem.