linux-kernel - [PATCH 2/2] perf tools: Fix python extension build for gcc 8

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20180319082902.4518-2-jolsa@kernel.org>
Date:   Mon, 19 Mar 2018 09:29:02 +0100
From:   Jiri Olsa <jolsa@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        David Ahern <dsahern@...il.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>
Subject: [PATCH 2/2] perf tools: Fix python extension build for gcc 8

From: root <root@...dick.tpb.lab.eng.brq.redhat.com>

The gcc 8 won't compile python extension code with
following errors (one example):

  python.c:830:15: error: cast between incompatible  function types from              \
  ‘PyObject * (*)(struct pyrf_evsel *, PyObject *, PyObject *)’                       \
  uct _object * (*)(struct pyrf_evsel *, struct _object *, struct _object *)’} to     \
  ‘PyObject * (*)(PyObject *, PyObject *)’ {aka ‘struct _object * (*)(struct _objeuct \
  _object *)’} [-Werror=cast-function-type]
     .ml_meth  = (PyCFunction)pyrf_evsel__open,

The problem with PyMethodDef::ml_meth callback is that
its type is determined based on PyMethodDef::ml_flags
value, which we set as METH_VARARGS | METH_KEYWORDS.

That indicates that the callback is expecting extra PyObject* arg,
and is actually PyCFunctionWithKeywords type, but the base
PyMethodDef::ml_meth type stays PyCFunction.

Previous gccs did not find this, gcc8 now does. Fixing
this by silencing this warning for python.c build.

Link: http://lkml.kernel.org/n/tip-gyl1jq6b27e9ad0wm9x4v1vr@git.kernel.org
Signed-off-by: Jiri Olsa <jolsa@...nel.org>
---
 tools/perf/util/setup.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/util/setup.py b/tools/perf/util/setup.py
index 6891635b50c3..1a3fac37112d 100644
--- a/tools/perf/util/setup.py
+++ b/tools/perf/util/setup.py
@@ -27,7 +27,7 @@ class install_lib(_install_lib):
 
 cflags = getenv('CFLAGS', '').split()
 # switch off several checks (need to be at the end of cflags list)
-cflags += ['-fno-strict-aliasing', '-Wno-write-strings', '-Wno-unused-parameter' ]
+cflags += ['-fno-strict-aliasing', '-Wno-write-strings', '-Wno-unused-parameter', '-Wno-cast-function-type' ]
 
 src_perf  = getenv('srctree') + '/tools/perf'
 build_lib = getenv('PYTHON_EXTBUILD_LIB')
-- 
2.13.6