[issue15495] enable type truncation warnings for gcc builds
Martin Panter
report at bugs.python.org
Thu Aug 11 08:52:34 EDT 2016
Martin Panter added the comment:
Issue 23545 has a patch with some comments from me about adding other warnings via “autoconf foo”, so you could copy from that if you want.
The few warnings that I glanced at do not look troublesome. But maybe it is worth working around them to see other warnings; I dunno. Adding explicit casts can sometimes hide other bugs. Anyway, here is a random selection of some warnings:
Modules/sha256module.c:198:44: warning: conversion to ‘SHA_INT32 {aka unsigned int}’ from ‘long unsigned int’ may alter its value [-Wconversion]
RND(S[0],S[1],S[2],S[3],S[4],S[5],S[6],S[7],48,0x19a4c116);
^
Modules/sha256module.c:145:11: note: in definition of macro ‘RND’
t0 = h + Sigma1(e) + Ch(e, f, g) + ki + W[i]; \
^
Modules/resource.c:19:60: warning: conversion to ‘double’ from ‘__suseconds_t {aka long int}’ may alter its value [-Wconversion]
#define doubletime(TV) ((double)(TV).tv_sec + (TV).tv_usec * 0.000001)
^
./Include/tupleobject.h:62:75: note: in definition of macro ‘PyTuple_SET_ITEM’
#define PyTuple_SET_ITEM(op, i, v) (((PyTupleObject *)(op))->ob_item[i] = v)
^
Modules/resource.c:82:5: note: in expansion of macro ‘PyStructSequence_SET_ITEM’
PyStructSequence_SET_ITEM(result, 0,
^~~~~~~~~~~~~~~~~~~~~~~~~
Modules/resource.c:83:40: note: in expansion of macro ‘doubletime’
PyFloat_FromDouble(doubletime(ru.ru_utime)));
^~~~~~~~~~
Modules/cjkcodecs/cjkcodecs.h:155:27: warning: conversion to ‘unsigned char’ from ‘int’ may alter its value [-Wconversion]
do { ((*outbuf)[1]) = (c); } while (0)
^
Modules/cjkcodecs/_codecs_kr.c:58:13: note: in expansion of macro ‘OUTBYTE2’
OUTBYTE2((code & 0xFF) | 0x80);
^~~~~~~~
Modules/_ctypes/cfield.c:439:15: warning: conversion to ‘short int’ from ‘int’ may alter its value [-Wconversion]
v >>= (sizeof(v)*8 - NUM_BITS(size)); \
^
Modules/_ctypes/cfield.c:594:5: note: in expansion of macro ‘GET_BITFIELD’
GET_BITFIELD(val, size);
^~~~~~~~~~~~
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nosy: +martin.panter
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<http://bugs.python.org/issue15495>
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