linux-kernel - [RFC] perf tools: Including pre-generated flex files

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Date:	Tue, 27 Mar 2012 15:15:47 -0300
From:	Arnaldo Carvalho de Melo <acme@...radead.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Jiri Olsa <jolsa@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [RFC] perf tools: Including pre-generated flex files

Hi Linus,

	We now use lex and bison for the events and PMU parser:

[acme@...dy linux]$ wc -l tools/perf/util/*.[yl]
  126 tools/perf/util/parse-events.l
  229 tools/perf/util/parse-events.y
   43 tools/perf/util/pmu.l
   93 tools/perf/util/pmu.y
  491 total

	Jiri and Peter agreed on having pre-generated files:

[acme@...dy linux]$ wc -l tools/perf/util/*-{bison,flex}.[ch]
  1917 tools/perf/util/parse-events-bison.c
    81 tools/perf/util/parse-events-bison.h
  1663 tools/perf/util/pmu-bison.c
    73 tools/perf/util/pmu-bison.h
  2272 tools/perf/util/parse-events-flex.c
   316 tools/perf/util/parse-events-flex.h
  1821 tools/perf/util/pmu-flex.c
   316 tools/perf/util/pmu-flex.h
  8459 total

so that we don't require even more tools to build the kernel, following
the precedent of:

[acme@...dy linux]$ wc -l scripts/*/*.[ch]_shipped
  1976 scripts/dtc/dtc-lexer.lex.c_shipped
  1946 scripts/dtc/dtc-parser.tab.c_shipped
    86 scripts/dtc/dtc-parser.tab.h_shipped
   220 scripts/genksyms/keywords.hash.c_shipped
  2245 scripts/genksyms/lex.lex.c_shipped
  2399 scripts/genksyms/parse.tab.c_shipped
    95 scripts/genksyms/parse.tab.h_shipped
   286 scripts/kconfig/zconf.hash.c_shipped
  2420 scripts/kconfig/zconf.lex.c_shipped
  2504 scripts/kconfig/zconf.tab.c_shipped
 14177 total
[acme@...dy linux]$

	But Ingo argues that flex and bison are just a yum/whatever
install away, so we shouldn't clutter the kernel git history with things
we can generate at build time.

	What is your take on this?

- Arnaldo
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