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Re: Building prog first

From: Ralf Wildenhues
Subject: Re: Building prog first
Date: Sun, 21 Mar 2010 10:32:47 +0100
User-agent: Mutt/1.5.20 (2009-12-10)

* Russell Shaw wrote on Sun, Mar 21, 2010 at 08:16:03AM CET:
> Ralf Wildenhues wrote:
> >Furthermore, please don't hard-code absolute paths like
> >  /usr/share/unicode/UnicodeData.txt
> >
> >in your makefiles.  Make them configurable by configure.  Maybe your
> >users don't have root rights on their system but have the file installed
> >below their home somewhere?
> Ok.
> I did: AC_CHECK_FILE([/usr/share/unicode/UnicodeData.txt], [], [])
> In "configure", i get:
>   if test "x$ac_cv_file__usr_share_unicode_UnicodeData_txt" = x""yes; then :
>   fi
> Shouldn't this be:
>   if test "x$ac_cv_file__usr_share_unicode_UnicodeData_txt" = "xyes"; then :
>   fi

First off, no, the two are completely equivalent.  This might not be
clear from a tutorial about shell quoting, but hey, shell quoting isn't

Then, AC_CHECK_FILE doesn't really help your user (and it kills cross
compilation, too).  If you really want to make this configurable, then
provide a switch or command line variables like

and if that is not given, search for a few known places where this can
be.  For example, on this system, there exists a file with this name in

but I cannot tell you if it has the contents you might expect.


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