Date: Fri, 2 Dec 2016 13:10:56 -0200
From: Arnaldo Carvalho de Melo <acme@redhat.com>
To: Jiri Olsa <jolsa@redhat.com>
Cc: Peter Foley <pefoley2@pefoley.com>,
        LKML <linux-kernel@vger.kernel.org>, wangnan0@huawei.com
Subject: Re: [PATCHv3] tools build: Make fixdep parsing wait for last target
Message-ID: <20161202151056.GA5931@redhat.com>
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 <20161129143314.GC2361@redhat.com>
 <20161129143935.GA22691@krava>
 <20161129144904.GD2361@redhat.com>
 <20161201130025.GA16430@krava>
 <CAOFdcFOU5=OZU8qv2funPyV-BkS174k-xUCJ-VMxmzUxgfO0qA@mail.gmail.com>
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Em Fri, Dec 02, 2016 at 10:15:39AM +0100, Jiri Olsa escreveu:
> On Thu, Dec 01, 2016 at 04:53:23PM -0200, Arnaldo Carvalho de Melo wrote:
> > Em Thu, Dec 01, 2016 at 09:48:40AM -0800, Peter Foley escreveu:
> > > On Thu, Dec 1, 2016 at 5:00 AM, Jiri Olsa <jolsa@redhat.com> wrote:
> > > > ok, so v3 actually ;-)

> > > > the v2 was tricky for the case when fixdep is not available,
> > > > so I decided to go with Peter's fix and fixing 'fixdep' tool
> > > > to properly parse out the target in case we hit the ccache
> > > > error.. we need to be able to do it anyway

> > > > please apply this patch before Peter's so we keep clean bisect

> > Doesn't work with ccache installed, but then after reinstalling ccache to check
> > its version, I can't reproduce it anymore, go figure :-\
> > 
> > Can you guys please take a look at tmp.perf/fixdep in my tree and check that
> > the last two patches are the ones that should go upstream and that you are able
> > to build it _with_ ccache installed?
 
> yep, works for me

So I saw it again, while processing Wang's eBPF/llvm patchkit, right after
removing the build dir and starting from scratch, doing that process one more
time made it work, so it looks like a race, and look it is in a HOSTCC bit,
related?

[acme@jouet linux]$ rm -rf /tmp/build/perf/ ; mkdir -p /tmp/build/perf ; make -k O=/tmp/build/perf -C tools/perf install-bin
make: Entering directory '/home/acme/git/linux/tools/perf'
  BUILD:   Doing 'make -j4' parallel build

Auto-detecting system features:
...                         dwarf: [ on  ]
...            dwarf_getlocations: [ on  ]
...                         glibc: [ on  ]
...                          gtk2: [ on  ]
...                      libaudit: [ on  ]
...                        libbfd: [ on  ]
...                        libelf: [ on  ]
...                       libnuma: [ on  ]
...        numa_num_possible_cpus: [ on  ]
...                       libperl: [ on  ]
...                     libpython: [ on  ]
...                      libslang: [ on  ]
...                     libcrypto: [ on  ]
...                     libunwind: [ on  ]
...            libdw-dwarf-unwind: [ on  ]
...                          zlib: [ on  ]
...                          lzma: [ on  ]
...                     get_cpuid: [ on  ]
...                           bpf: [ on  ]

  GEN      /tmp/build/perf/common-cmds.h
  HOSTCC   /tmp/build/perf/fixdep.o
  HOSTLD   /tmp/build/perf/fixdep-in.o
  LINK     /tmp/build/perf/fixdep
  MKDIR    /tmp/build/perf/pmu-events/
  HOSTCC   /tmp/build/perf/pmu-events/json.o
/bin/sh: /tmp/build/perf//fixdep: Permission denied
/home/acme/git/linux/tools/build/Makefile.build:91: recipe for target '/tmp/build/perf/pmu-events/json.o' failed
make[2]: *** [/tmp/build/perf/pmu-events/json.o] Error 1
Makefile.perf:469: recipe for target '/tmp/build/perf/pmu-events/jevents-in.o' failed
make[1]: *** [/tmp/build/perf/pmu-events/jevents-in.o] Error 2
make[1]: *** Waiting for unfinished jobs....
  PERF_VERSION = 4.9.rc6.g165081a
make[1]: *** wait: No child processes.  Stop.
Makefile:108: recipe for target 'install-bin' failed
make: *** [install-bin] Error 2
make: Leaving directory '/home/acme/git/linux/tools/perf'