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Date: Fri, 8 Apr 2016 09:55:09 -0300
From: Arnaldo Carvalho de Melo <acme@kernel.org>
To: Wang Nan <wangnan0@huawei.com>
Cc: pi3orama@163.com, linux-kernel@vger.kernel.org, lizefan@huawei.com,
        Adrian Hunter <adrian.hunter@intel.com>,
        David Ahern <dsahern@gmail.com>, Jiri Olsa <jolsa@kernel.org>,
        Namhyung Kim <namhyung@kernel.org>, Ingo Molnar <mingo@kernel.org>
Subject: Re: [PATCH] perf build: Fix syscall table dependency error
Message-ID: <20160408125509.GK5945@kernel.org>
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Em Fri, Apr 08, 2016 at 06:35:25AM +0000, Wang Nan escreveu:
> Commit 42abeef7e8df ("perf tools: Build syscall table .c header from
> kernel's syscall_64.tbl") introduces archheaders dependency. It is
> added to 'prepare', but not added directly to libperf-in.o, causes
> following error:
> 
>  $ make -C ./tools/perf/ O=/tmp/xxxxx/ /tmp/xxxxx/libperf-in.o JOBS=1
>  make: Entering directory `/xx/xx/tools/perf'
>  BUILD:   Doing 'make -j1' parallel build
> 
>  Auto-detecting system features:
>  ...                         dwarf: [ on  ]
>  ...            dwarf_getlocations: [ on  ]
>  <SNIP>
>    CC       /tmp/xxxxx/util/map.o
>    CC       /tmp/xxxxx/util/pstack.o
>    CC       /tmp/xxxxx/util/session.o
>    make[3]: *** No rule to make target `/tmp/xxxxx/arch/x86/include/generated/asm/syscalls_64.c', needed by `/tmp/xxxxx/util/syscalltbl.o'.  Stop.
>    make[2]: *** [util] Error 2
>    make[1]: *** [/tmp/xxxxx/libperf-in.o] Error 2
>    make: *** [/tmp/xxxxx/libperf-in.o] Error 2
>    make: Leaving directory `/home/w00229757/kernel-hydrogen/tools/perf'
> 
> In parallel building this missing dependency causes building error.
> 
> Add 'prepare' to libperf-in's dependency.

Thanks, I'll try to merge this into the offending patch so that we don't
lose bisection, Ingo, if you hear me, please don't pull the latest tag.

- Arnaldo
 
> Signed-off-by: Wang Nan <wangnan0@huawei.com>
> Cc: Adrian Hunter <adrian.hunter@intel.com>
> Cc: David Ahern <dsahern@gmail.com>
> Cc: Jiri Olsa <jolsa@kernel.org>
> Cc: Namhyung Kim <namhyung@kernel.org>
> ---
>  tools/perf/Makefile.perf | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
> index 1469aea..bde8cba 100644
> --- a/tools/perf/Makefile.perf
> +++ b/tools/perf/Makefile.perf
> @@ -433,7 +433,7 @@ $(patsubst perf-%,%.o,$(PROGRAMS)): $(wildcard */*.h)
>  
>  LIBPERF_IN := $(OUTPUT)libperf-in.o
>  
> -$(LIBPERF_IN): fixdep FORCE
> +$(LIBPERF_IN): prepare fixdep FORCE
>  	$(Q)$(MAKE) $(build)=libperf
>  
>  $(LIB_FILE): $(LIBPERF_IN)
> -- 
> 1.8.3.4