Re: followup to previous question

[Paul D. Smith]

%% Regarding followup to previous question; you wrote:

  rpjd> there's a top-level VERSION file, whose contents will be something
  rpjd> like "3.2.2".  so, for now, i can use:

  rpjd> SRCDIR = [top of source tree]
  rpjd> FULL_VERSION := $(shell cat ${SRCDIR}/VERSION)
  rpjd> $(warning Full version is ${FULL_VERSION}.)

  rpjd> MAJOR_VERSION := $(shell expr ${FULL_VERSION} : "\([0-9]*\)")
  rpjd> $(warning version is ${MAJOR_VERSION}.)

  rpjd> even though the above works, i'm just betting there's a more natural
  rpjd> way to do either of:

  rpjd> 1) get the contents of a one-line text file
  rpjd> 2) extract the leading fully-numeric substring of a string

  rpjd> am i right?  or is the above pretty much it?

That's about it as far as getting the contents.  You can get the major
version much more easily, though:

    MAJOR_VERSION := $(firstword $(subst ., ,$(FULL_VERSION)))

If the VERSION file had a make-like syntax, like:

    FULL_VERSION = 3.2.2

then you could, of course, just include it.

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