[PATCH] perf tools: Fix python extension build

[Jiri Olsa <jolsa@redhat.com>]

On Fri, Feb 26, 2016 at 11:59:03PM +0100, Jiri Olsa wrote:
> On Fri, Feb 26, 2016 at 05:49:02PM -0500, Josh Boyer wrote:
> 
> SNIP
> 
> > > ./python_ext_build/tmp/home/jolsa/kernel/linux-perf/tools/perf/util/evsel.o
> > > ./python_ext_build/tmp/home/jolsa/kernel/linux-perf/tools/perf/util/trace-event.o
> > > ./python_ext_build/tmp/home/jolsa/kernel/linux-perf/tools/perf/util/xyarray.o
> > > ./python_ext_build/tmp/home/jolsa/kernel/linux-perf/tools/perf/util/python.o
> > > ./python_ext_build/tmp/home/jolsa/kernel/linux-perf/tools/perf/util/ctype.o
> > > ./python_ext_build/tmp/home/jolsa/kernel/linux-perf/tools/perf/util/cgroup.o
> > > ./python_ext_build/tmp/home/jolsa/kernel/linux-perf/tools/perf/util/rblist.o
> > > ./python_ext_build/tmp/home/jolsa/kernel/linux-perf/tools/perf/util/string.o
> > > ./python_ext_build/tmp/home/jolsa/kernel/linux-perf/tools/lib
> > > ./python_ext_build/tmp/home/jolsa/kernel/linux-perf/tools/lib/hweight.o
> > > ./python_ext_build/tmp/home/jolsa/kernel/linux-perf/tools/lib/rbtree.o
> > > ./python_ext_build/tmp/home/jolsa/kernel/linux-perf/tools/lib/bitmap.o
> > > ./python_ext_build/tmp/home/jolsa/kernel/linux-perf/tools/lib/find_bit.o
> > >
> > > not sure we want to come up with some 'nicer' solution
> > 
> > I don't think anything under python_ext_build/tmp/ actually matters in
> > any significant way.  As long as this doesn't negatively impact
> > something via side-effect, it's probably good enough.
> 
> right, and it's probably generic sollution too
> 
> > 
> > Will you write up a full patch?
> 
> yep, will post it tomorrow
> 
> jirka

sending full patch

jirka


---
The util/python-ext-sources file contains sources files
for python extension relative to $(srctree)/tools/perf,

Such a file path $(FILE).c is handed over to the python
extension build system, which builts final object in
$(PYTHON_EXTBUILD)/tmp/$(FILE).o path.

After build is done all files from $(PYTHON_EXTBUILD)lib/
are carried as the result binaries.

Above system fails when we add source file relative to
../lib, which we do for:

  ../lib/bitmap.c
  ../lib/find_bit.c
  ../lib/hweight.c
  ../lib/rbtree.c

All above objects will be built like:

  $(PYTHON_EXTBUILD)/tmp/../lib/bitmap.c
  $(PYTHON_EXTBUILD)/tmp/../lib/find_bit.c
  $(PYTHON_EXTBUILD)/tmp/../lib/hweight.c
  $(PYTHON_EXTBUILD)/tmp/../lib/rbtree.c

which accidentally happens to be final library path:
  $(PYTHON_EXTBUILD)/lib/

Changing setup.py to pass full paths of source files
to Extension build class and thus keep all built objects
under $(PYTHON_EXTBUILD)tmp directory.

Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Reported-by: Josh Boyer <jwboyer@fedoraproject.org>
Link: http://lkml.kernel.org/n/tip-z14ivktbyblnz9ivuo0zau8l@git.kernel.org
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
 tools/perf/util/setup.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tools/perf/util/setup.py b/tools/perf/util/setup.py
index 1833103768cb..c8680984d2d6 100644
--- a/tools/perf/util/setup.py
+++ b/tools/perf/util/setup.py
@@ -22,6 +22,7 @@ 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' ]
 
+src_perf  = getenv('srctree') + '/tools/perf'
 build_lib = getenv('PYTHON_EXTBUILD_LIB')
 build_tmp = getenv('PYTHON_EXTBUILD_TMP')
 libtraceevent = getenv('LIBTRACEEVENT')
@@ -30,6 +31,9 @@ libapikfs = getenv('LIBAPI')
 ext_sources = [f.strip() for f in file('util/python-ext-sources')
 				if len(f.strip()) > 0 and f[0] != '#']
 
+# use full paths with source files
+ext_sources = map(lambda x: '%s/%s' % (src_perf, x) , ext_sources)
+
 perf = Extension('perf',
 		  sources = ext_sources,
 		  include_dirs = ['util/include'],
-- 
2.4.3