clang compiler warnings on Travis

[tiran]

BPO	32948
Nosy	@tiran, @iritkatriel

^{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 2021-06-22.22:06:11.116>
created_at = <Date 2018-02-25.13:28:39.310>
labels = ['extension-modules', 'build']
title = 'clang compiler warnings on Travis'
updated_at = <Date 2021-06-22.22:06:11.115>
user = 'https://github.com/tiran'

bugs.python.org fields:

activity = <Date 2021-06-22.22:06:11.115>
actor = 'iritkatriel'
assignee = 'none'
closed = True
closed_date = <Date 2021-06-22.22:06:11.116>
closer = 'iritkatriel'
components = ['Extension Modules']
creation = <Date 2018-02-25.13:28:39.310>
creator = 'christian.heimes'
dependencies = []
files = []
hgrepos = []
issue_num = 32948
keywords = []
message_count = 2.0
messages = ['312810', '396368']
nosy_count = 2.0
nosy_names = ['christian.heimes', 'iritkatriel']
pr_nums = []
priority = 'low'
resolution = 'out of date'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'compile error'
url = 'https://bugs.python.org/issue32948'
versions = ['Python 2.7']

[tiran]

I'm seeing a bunch of compile errors on 2.7 branch, https://travis-ci.org/python/cpython/jobs/345906584

/home/travis/build/python/cpython/Modules/_heapqmodule.c:600:21: warning: illegal character encoding in string literal [-Winvalid-source-encoding]
[explanation by Fran<E7>ois Pinard]\n\
                    ^~~~
Include/Python.h:174:60: note: expanded from macro 'PyDoc_STRVAR'
#define PyDoc_STRVAR(name,str) PyDoc_VAR(name) = PyDoc_STR(str)
                                                           ^
Include/Python.h:176:24: note: expanded from macro 'PyDoc_STR'
#define PyDoc_STR(str) str
                       ^
1 warning generated.

clang -pthread -fno-strict-aliasing -OPT:Olimit=0 -g -O2 -g -O0 -Wall -Wstrict-prototypes -I. -IInclude -I./Include -DPy_BUILD_CORE -c ./Modules/pwdmodule.c -o Modules/pwdmodule.o
./Modules/posixmodule.c:363:13: warning: comparison of constant 9223372036854775807 with expression of type 'uid_t' (aka 'unsigned int') is always true [-Wtautological-constant-out-of-range-compare]
if (uid <= LONG_MAX)
~~~ ^ ~~~~~~~~
./Modules/posixmodule.c:371:13: warning: comparison of constant 9223372036854775807 with expression of type 'gid_t' (aka 'unsigned int') is always true [-Wtautological-constant-out-of-range-compare]
if (gid <= LONG_MAX)
~~~ ^ ~~~~~~~~
clang -pthread -fno-strict-aliasing -OPT:Olimit=0 -g -O2 -g -O0 -Wall -Wstrict-prototypes -I. -IInclude -I./Include -DPy_BUILD_CORE -c ./Modules/_sre.c -o Modules/_sre.o
clang -pthread -fno-strict-aliasing -OPT:Olimit=0 -g -O2 -g -O0 -Wall -Wstrict-prototypes -I. -IInclude -I./Include -DPy_BUILD_CORE -c ./Modules/_codecsmodule.c -o Modules/_codecsmodule.o
./Modules/pwdmodule.c:115:17: warning: comparison of unsigned expression < 0 is always false [-Wtautological-compare]
if (uid < 0)
~~~ ^ ~
1 warning generated.

/home/travis/build/python/cpython/Modules/grpmodule.c:102:17: warning: comparison of unsigned expression < 0 is always false [-Wtautological-compare]
if (gid < 0)
~~~ ^ ~
1 warning generated.

/cpython/Modules/nismodule.c -o build/temp.linux-x86_64-2.7-pydebug/home/travis/build/python/cpython/Modules/nismodule.o
/home/travis/build/python/cpython/Modules/nismodule.c:404:15: warning: 
      explicitly assigning value of variable of type 'nismaplist *' (aka
      'struct nismaplist *') to itself [-Wself-assign]
    for (maps = maps; maps; maps = maps->next) {
         ~~~~ ^ ~~~~
1 warning generated.

/cpython/Modules/_cursesmodule.c -o build/temp.linux-x86_64-2.7-pydebug/home/travis/build/python/cpython/Modules/_cursesmodule.o
/home/travis/build/python/cpython/Modules/_cursesmodule.c:1082:15: warning: 
      implicit conversion from 'chtype' (aka 'unsigned long') to 'int' changes
      value from 18446744073709551615 to -1 [-Wconstant-conversion]
        rtn = mvwinch(self->win,y,x);
            ~ ^~~~~~~~~~~~~~~~~~~~~~
/usr/include/curses.h:1247:58: note: expanded from macro 'mvwinch'
  ...(wmove((win),(y),(x)) == ERR ? NCURSES_CAST(chtype, ERR) : winch(win))
                                    ^~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/curses.h:222:34: note: expanded from macro 'NCURSES_CAST'
#define NCURSES_CAST(type,value) (type)(value)
                                 ^~~~~~~~~~~~~
1 warning generated.

[iritkatriel]

2.7-specific issue.