linux-kernel - Re: [PATCH] perf record: fix link time error with sample_reg

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Date:	Wed, 2 Sep 2015 12:46:48 +0300
From:	Adrian Hunter <adrian.hunter@...el.com>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	linux-kernel@...r.kernel.org, acme@...hat.com,
	peterz@...radead.org, mingo@...e.hu, ak@...ux.intel.com,
	jolsa@...hat.com, namhyung@...nel.org, kan.liang@...el.com,
	dsahern@...il.com
Subject: Re: [PATCH] perf record: fix link time error with sample_reg_masks on
 non x86

On 01/09/15 12:30, Stephane Eranian wrote:
> This patch makes perf compile on non x86 platforms by defining
> a weak symbol for sample_reg_masks[] in util/perf_regs.c.
> 
> The patch also moves the REG() and REG_END() macros into the
> util/per_regs.h header file. The macros are renamed to
> SMPL_REG/SMPL_REG_END to avoid clashes with other header files.
> 
> Signed-off-by: Stephane Eranian <eranian@...gle.com>

Doesn't seem to work on powerpc, presumably because util/perf_regs.c is not built?

$ make  CROSS_COMPILE=powerpc-linux-gnu- ARCH=powerpc -C tools/perf >/dev/null
config/Makefile:245: No libelf found, disables 'probe' tool, please install elfutils-libelf-devel/libelf-dev
config/Makefile:329: Disabling post unwind, no support found.
config/Makefile:370: No libaudit.h found, disables 'trace' tool, please install audit-libs-devel or libaudit-dev
config/Makefile:385: slang not found, disables TUI support. Please install slang-devel or libslang-dev
config/Makefile:399: GTK2 not found, disables GTK2 support. Please install gtk2-devel or libgtk2.0-dev
config/Makefile:427: Missing perl devel files. Disabling perl scripting support, please install perl-ExtUtils-Embed/libperl-dev
config/Makefile:470: No 'Python.h' (for Python 2.x support) was found: disables Python support - please install python-devel/python-dev
config/Makefile:560: No liblzma found, disables xz kernel module decompression, please install xz-devel/liblzma-dev
config/Makefile:573: No numa.h found, disables 'perf bench numa mem' benchmark, please install numactl-devel/libnuma-devel/libnuma-dev
  PERF_VERSION = 4.2.g02f9f7
libperf.a(libperf-in.o): In function `parse_regs':
/mnt/ssd/ahunter/git/linux-perf/tools/perf/util/parse-regs-options.c:28: undefined reference to `sample_reg_masks'
/mnt/ssd/ahunter/git/linux-perf/tools/perf/util/parse-regs-options.c:28: undefined reference to `sample_reg_masks'
/mnt/ssd/ahunter/git/linux-perf/tools/perf/util/parse-regs-options.c:45: undefined reference to `sample_reg_masks'
/mnt/ssd/ahunter/git/linux-perf/tools/perf/util/parse-regs-options.c:38: undefined reference to `sample_reg_masks'
/mnt/ssd/ahunter/git/linux-perf/tools/perf/util/parse-regs-options.c:38: undefined reference to `sample_reg_masks'
collect2: error: ld returned 1 exit status
make[1]: *** [perf] Error 1
make: *** [all] Error 2

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