Re: [PATCH] tools build: replace $(CC) -E with $(CPP) for pre-processing

From	Masahiro Yamada <yamada.masahiro@socionext.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH] tools build: replace $(CC) -E with $(CPP) for pre-processing
Date	2016-12-24 07:30 +0100
Message-ID	<sRO09-3a6-5@gated-at.bofh.it> (permalink)
References	<sRpXP-2a2-1@gated-at.bofh.it> <sRvTz-674-23@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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Hi Jiri,

2016-12-23 19:59 GMT+09:00 Jiri Olsa <jolsa@redhat.com>:
> On Fri, Dec 23, 2016 at 01:46:42PM +0900, Masahiro Yamada wrote:
>> The top-level Makefile defines:
>>
>>   CPP             = $(CC) -E
>
> hum, so that'd work for running from top level, but I guess
> it fails for compiling from other places..? like tools/perf

I thought users are supposed to build tools from the top-level, but
seems it is not necessarily true
according to your statement.

I am not quite sure how CC, AS, etc. are set-up, then.
Perhaps, relying on Make-builtin variables?

$ make --print-data-base | grep CPP

showed me the default of CPP is

CPP = $(CC) -E

I guess you are more familiar to the tools-build area,
so I follow your decision.

-- 
Best Regards
Masahiro Yamada

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[PATCH] tools build: replace $(CC) -E with $(CPP) for pre-processing Masahiro Yamada <yamada.masahiro@socionext.com> - 2016-12-23 05:50 +0100
  Re: [PATCH] tools build: replace $(CC) -E with $(CPP) for  pre-processing Jiri Olsa <jolsa@redhat.com> - 2016-12-23 12:10 +0100
    Re: [PATCH] tools build: replace $(CC) -E with $(CPP) for pre-processing Masahiro Yamada <yamada.masahiro@socionext.com> - 2016-12-24 07:30 +0100

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