New submission from Xavier de Gaye:
Building Python with clang and ccache produces about 200 'parentheses-equality'
warnings with the message:
warning: equality comparison with extraneous parentheses
[-Wparentheses-equality]
It seems that clang does not recognize that these extraneous parentheses are
valid [1] after a macro expansion because the preprocessing is done as a
separate stage by ccache.
[1] For example:
With the macros:
#define Py_TYPE(ob) (((PyObject*)(ob))->ob_type)
#define PyLong_CheckExact(op) (Py_TYPE(op) == &PyLong_Type)
The statement:
if (PyLong_CheckExact(v))
is expanded to:
if (((((PyObject*)(v))->ob_type) == &PyLong_Type))
and produces the warning with ccache.
----------
components: Devguide
files: clang_ccache.patch
keywords: patch
messages: 267881
nosy: eric.araujo, ezio.melotti, ncoghlan, willingc, xdegaye
priority: normal
severity: normal
stage: patch review
status: open
title: 'parentheses-equality' warnings when building with clang and ccache
type: enhancement
Added file: http://bugs.python.org/file43309/clang_ccache.patch
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue27270>
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