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    Subject[RFC] perf tools: Including pre-generated flex files
    Hi Linus,

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

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