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    SubjectRe: [RFC PATCH] Add a 'minimal tree install' target

    On Thu, Sep 13, 2007 at 09:19:38PM +0200, Sam Ravnborg wrote:
    > >
    > > sed -n "s/^ALTARCH[[:space:]]:=[[:space:]]\(.*$\)\+/\1/p"
    > >
    > > (i'm sure there is a better way though)
    > Oleg (added to mail) - you are quite confident in sed et al.
    > Let us know if there is a simpler way.
    > (We want to pick i386 from include/asm-x86_64/Kbuild
    > and similar for the architectures that uses ARCHDEF).

    That particular one-line `ALTARCH := i386' of course can be matched
    simpler, because there's only *one* (as written above) whitespace and no
    make's assignment variations, like (?=,=). I wonder, if there can be more
    options, than i386 and more occurrences of `ALTARCH' actually :) Also,
    make can have lead whitespace on line start, as well as near assignment
    sign, if that matters.

    So, to match *one* line with *one* `ALTARCH' followed by `i386'

    sed -n '/ALTARCH/{/i386/{p ; q}}'

    is fine by me. If there are dis-assignments, so to speak, or comments
    with i386 this will not work obviously. But it's fast and must work
    with variety of make syntax. Check is "for non empty output".

    Also, please take a look on man isspace(). It matches much more
    characters, than necessary for ordinary syntax whitespace. Using
    [:blank:] (i.e. tab and space, with no options) is OK. Last thing: i'm not
    sure, what that `+' is. I stick to BRE in sed, as it should be, so just
    don't know what it does.

    Hope that helps.
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      Last update: 2007-09-13 22:05    [W:0.021 / U:159.572 seconds]
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