linux-kernel - Re: [PATCH v2] Fix objtool with clang

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Date:   Mon, 28 Nov 2016 13:00:24 -0200
From:   Arnaldo Carvalho de Melo <acme@...hat.com>
To:     Peter Foley <pefoley2@...oley.com>
Cc:     Jiri Olsa <jolsa@...hat.com>, linux-kernel@...r.kernel.org,
        wangnan0@...wei.com
Subject: Re: [PATCH v2] Fix objtool with clang

Em Mon, Nov 28, 2016 at 12:39:28PM +0100, Jiri Olsa escreveu:
> On Sun, Nov 27, 2016 at 09:43:46PM -0500, Peter Foley wrote:
> > Clang doesn't support multiple arguments being passed to -Wp, so split
> > them.
> > 
> > Fixes this error:
> > HOSTCC   tools/objtool/fixdep.o
> > cat: tools/objtool/.fixdep.o.d: No such file or directory
> > 
> > v2:
> > rebased onto perf/core branch.
> > 
> > Signed-off-by: Peter Foley <pefoley2@...oley.com>
> 
> Acked-by: Jiri Olsa <jolsa@...nel.org>

After I applied this I started getting this:

  CC       /tmp/build/perf/tests/sw-clock.o
/tmp/build/perf/.plugin_jbd2.o.cmd:3: *** empty variable name.  Stop.
Makefile:192: recipe for target '/tmp/build/perf/plugin_jbd2-in.o' failed
make[2]: *** [/tmp/build/perf/plugin_jbd2-in.o] Error 2
Makefile.perf:591: recipe for target '/tmp/build/perf/libtraceevent-dynamic-list' failed
make[1]: *** [/tmp/build/perf/libtraceevent-dynamic-list] Error 2
make[1]: *** Waiting for unfinished jobs....
  CC       /tmp/build/perf/tests/mmap-thread-lookup.o

If I remove the O= build dir and restart, I get it again:

[acme@...et 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
<SNIP>

  CC       /tmp/build/perf/util/pmu-bison.o
/tmp/build/perf/.plugin_jbd2.o.cmd:3: *** empty variable name.  Stop.
Makefile:192: recipe for target '/tmp/build/perf/plugin_jbd2-in.o' failed
make[2]: *** [/tmp/build/perf/plugin_jbd2-in.o] Error 2
Makefile.perf:591: recipe for target '/tmp/build/perf/libtraceevent-dynamic-list' failed
make[1]: *** [/tmp/build/perf/libtraceevent-dynamic-list] Error 2
make[1]: *** Waiting for unfinished jobs....
  CC       /tmp/build/perf/util/parse-events.o
  CC       /tmp/build/perf/util/parse-events-flex.o

Trying to nuke my ccache dir:

Doesn't help:

[acme@...et linux]$ rm -rf ~/.ccache/
[acme@...et linux]$ m
make: Entering directory '/home/acme/git/linux/tools/perf'
  BUILD:   Doing 'make -j4' parallel build
/tmp/build/perf/jvmti/.jvmti_agent.o.cmd:3: *** empty variable name.  Stop.
Makefile.perf:566: recipe for target '/tmp/build/perf/jvmti/jvmti-in.o' failed
make[1]: *** [/tmp/build/perf/jvmti/jvmti-in.o] Error 2
make[1]: *** Waiting for unfinished jobs....
/tmp/build/perf/pmu-events/.jevents.o.cmd:3: *** empty variable name.  Stop.
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
Makefile:108: recipe for target 'install-bin' failed
make: *** [install-bin] Error 2
make: Leaving directory '/home/acme/git/linux/tools/perf'

 Performance counter stats for 'make -k O=/tmp/build/perf -C tools/perf install-bin':

     5,406,254,581      cycles:u                                                    
     8,259,935,345      instructions:u            #    1.53  insn per cycle         

       2.150027964 seconds time elapsed

[acme@...et linux]$