document minimum sqlite version

[carlwgeorge]

BPO	29098
Nosy	@berkerpeksag, @carlwgeorge
Dependencies	bpo-29355: sqlite3: remove sqlite3_stmt_readonly()

^{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 2017-02-26.16:14:06.976>
created_at = <Date 2016-12-28.22:08:50.718>
labels = ['type-feature', '3.7', 'docs']
title = 'document minimum sqlite version'
updated_at = <Date 2017-02-26.16:14:06.975>
user = 'https://github.com/carlwgeorge'

bugs.python.org fields:

activity = <Date 2017-02-26.16:14:06.975>
actor = 'berker.peksag'
assignee = 'docs@python'
closed = True
closed_date = <Date 2017-02-26.16:14:06.976>
closer = 'berker.peksag'
components = ['Documentation']
creation = <Date 2016-12-28.22:08:50.718>
creator = 'carlwgeorge'
dependencies = ['29355']
files = []
hgrepos = []
issue_num = 29098
keywords = []
message_count = 2.0
messages = ['284202', '288601']
nosy_count = 3.0
nosy_names = ['docs@python', 'berker.peksag', 'carlwgeorge']
pr_nums = []
priority = 'normal'
resolution = 'out of date'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue29098'
versions = ['Python 3.6', 'Python 3.7']

[carlwgeorge]

While attempting to build a Python 3.6 RPM for RHEL/CentOS 6, I noticed the following warning.

*** WARNING: renaming "_sqlite3" since importing it failed: build/lib.linux-i686-3.6-pydebug/_sqlite3.cpython-36dm-i386-linux-gnu.so: undefined symbol: sqlite3_stmt_readonly

I was able to locate changeset 284676cf2ac8 (bpo-10740) which introduced the usage of the sqlite3_stmt_readonly interface. That interface wasn't added to sqlite until 3.7.4 (http://www.sqlite.org/releaselog/3_7_4.html). My RPM build failed because RHEL/CentOS 6 only has sqlite 3.6.20. I understand that Python can't support old libraries forever, but can this minimum sqlite version be noted somewhere in the documentation?

[berkerpeksag]

Thanks for the report, Carl! The patch for bpo-28518 has been lifted the requirement for sqlite3_stmt_readonly() so you can now use and compile Python 3.6.1 without a warning at compile time.