linux-kernel - Re: [PATCH] perf tools: Fix build error on zfree()

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Date:	Mon, 13 Jan 2014 15:00:22 -0300
From:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Namhyung Kim <namhyung.kim@....com>
Subject: Re: [PATCH] perf tools: Fix build error on zfree()

Em Thu, Jan 09, 2014 at 11:07:59PM +0900, Namhyung Kim escreveu:
> It failed to build perf on my ubuntu 10.04 box (gcc 4.4.3):
> 
>     CC       util/strlist.o
>   cc1: warnings being treated as errors
>   util/strlist.c: In function ‘str_node__delete’:
>   util/strlist.c:42: error: dereferencing type-punned pointer will break strict-aliasing rules
>   util/strlist.c:42: error: dereferencing type-punned pointer will break strict-aliasing rules
>     CC       util/strfilter.o
>   make: *** [util/strlist.o] Error 1
> 
>     CC       util/srcline.o
>   cc1: warnings being treated as errors
>   util/srcline.c: In function ‘addr2line_init’:
>   util/srcline.c:132: error: dereferencing type-punned pointer will break strict-aliasing rules
>   util/srcline.c:132: error: dereferencing type-punned pointer will break strict-aliasing rules
>   util/srcline.c: In function ‘addr2line_cleanup’:
>   util/srcline.c:143: error: dereferencing type-punned pointer will break strict-aliasing rules
>   util/srcline.c:143: error: dereferencing type-punned pointer will break strict-aliasing rules
>   make: *** [util/srcline.o] Error 1
> 
> It seems it only allows to remove 'const' qualifier.

Humm, I just tried building it here on:

acme@...ntu13:~/git/linux$ uname -a
Linux ubuntu13 3.11.0-12-generic #19-Ubuntu SMP Wed Oct 9 16:20:46 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
acme@...ntu13:~/git/linux$ cat /etc/debian_version 
wheezy/sid
acme@...ntu13:~/git/linux$

acme@...ntu13:~/git/linux$ make O=/tmp/build/perf -C tools/perf install
make: Entering directory `/home/acme/git/linux/tools/perf'
  BUILD:   Doing 'make -j4' parallel build

Auto-detecting system features:
...                     backtrace: [ on  ]
...                         dwarf: [ OFF ]
...                fortify-source: [ on  ]
...                         glibc: [ on  ]
...                          gtk2: [ OFF ]
...                  gtk2-infobar: [ OFF ]
...                      libaudit: [ OFF ]
...                        libbfd: [ OFF ]
...                        libelf: [ OFF ]
...             libelf-getphdrnum: [ OFF ]
...                   libelf-mmap: [ OFF ]
...                       libnuma: [ OFF ]
...                       libperl: [ OFF ]
...                     libpython: [ OFF ]
...             libpython-version: [ OFF ]
...                      libslang: [ OFF ]
...                     libunwind: [ OFF ]
...                       on-exit: [ on  ]
...            stackprotector-all: [ on  ]
...                       timerfd: [ on  ]

config/Makefile:276: No libelf found, disables 'probe' tool, please install elfutils-libelf-devel/libelf-dev
config/Makefile:327: No libunwind found, disabling post unwind support. Please install libunwind-dev[el] >= 1.1
config/Makefile:350: No libaudit.h found, disables 'trace' tool, please install audit-libs-devel or libaudit-dev
config/Makefile:364: slang not found, disables TUI support. Please install slang-devel or libslang-dev
config/Makefile:377: GTK2 not found, disables GTK2 support. Please install gtk2-devel or libgtk2.0-dev
config/Makefile:438: The path '/usr/bin/python-config' is not executable.
config/Makefile:442: No python-config tool was found
config/Makefile:442: Python support will not be built
config/Makefile:532: No numa.h found, disables 'perf bench numa mem' benchmark, please install numactl-devel/libnuma-devel/libnuma-dev
  MKDIR    /tmp/build/perf/arch
<SNIP>
  CC       /tmp/build/perf/util/strlist.o
<SNIP>
  CC       /tmp/build/perf/util/parse-events.o
  CC       /tmp/build/perf/util/parse-events-flex.o
  AR       /tmp/build/perf/libperf.a
  LINK     /tmp/build/perf/perf
  INSTALL  binaries
  INSTALL  libexec
  INSTALL  perf-archive
  INSTALL  perf_completion-script
  INSTALL  tests
make: Leaving directory `/home/acme/git/linux/tools/perf'
acme@...ntu13:~/git/linux$ 

Works just fine, can you provide more details about your system? Is it 32-bit?

I'm installing more devel packages to this just installed 64-bit VM system and
will install another VM with a 32-bit Ubuntu with the same version as you.

- Arnaldo
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