ast.c: end_col_offset may be used uninitialized in this function

[vstinner]

BPO	35878
Nosy	@vstinner, @ilevkivskyi, @emilyemorehouse
PRs	bpo-35878: Fix compiler warnings about end_col_offset and end_lineno #11735 bpo-35878: Fix compiler warnings about end_col_offset and end_lineno #11735 bpo-35878: Fix compiler warnings about end_col_offset and end_lineno #11735

^{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 2019-02-10.15:40:20.022>
created_at = <Date 2019-02-01.11:22:41.487>
labels = ['interpreter-core', 'build', '3.8']
title = 'ast.c: end_col_offset may be used uninitialized in this function'
updated_at = <Date 2019-02-11.11:31:47.842>
user = 'https://github.com/vstinner'

bugs.python.org fields:

activity = <Date 2019-02-11.11:31:47.842>
actor = 'vstinner'
assignee = 'none'
closed = True
closed_date = <Date 2019-02-10.15:40:20.022>
closer = 'levkivskyi'
components = ['Interpreter Core']
creation = <Date 2019-02-01.11:22:41.487>
creator = 'vstinner'
dependencies = []
files = []
hgrepos = []
issue_num = 35878
keywords = ['patch', 'patch', 'patch']
message_count = 2.0
messages = ['334670', '335208']
nosy_count = 3.0
nosy_names = ['vstinner', 'levkivskyi', 'emilyemorehouse']
pr_nums = ['11735', '11735', '11735']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'compile error'
url = 'https://bugs.python.org/issue35878'
versions = ['Python 3.8']

[vstinner]

https://buildbot.python.org/all/#builders/103/builds/2023

There are many "end_col_offset may be used uninitialized in this function" warnings. Example:

In file included from Python/ast.c:7:0:
Python/ast.c: In function ‘ast_for_funcdef_impl’:
./Include/Python-ast.h:484:66: warning: ‘end_col_offset’ may be used uninitialized in this function [-Wmaybe-uninitialized]
 #define FunctionDef(a0, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10) _Py_FunctionDef(a0, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10)
                                                                  ^~~~~~~~~~~~~~~
Python/ast.c:1738:21: note: ‘end_col_offset’ was declared here
     int end_lineno, end_col_offset;
                     ^~~~~~~~~~~~~~

[vstinner]

Ivan Levkivskyi fixed the warning with commit 181835d.

I created bpo-35963 Python/symtable.c: warning: enumeration value ‘FunctionType_kind’ not handled in switch [-Wswitch]" for a remaining warning.