Messages in this thread Patch in this message | | | From | Jiri Olsa <> | Subject | [PATCH 2/2] perf tools: Fix python extension build for gcc 8 | Date | Mon, 19 Mar 2018 09:29:02 +0100 |
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From: root <root@riddick.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@kernel.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
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