* Jason Sewall wrote on Sun, Apr 25, 2010 at 07:16:25PM CEST:
> Ralf Wildenhues <Ralf.Wildenhues <at> gmx.de> writes:
> > $ac_top_srcdir, as documented in "info Autoconf 'Configuration Actions'".
> > Since configure is always run the top build directory, it should suffice
> > to use $srcdir though.
>
> Well, perhaps I understand less of autoconf than I thought I did. I
> tried to put GIT_VERSION=`$(ac_top_srcdir)/GIT-VERSION-GEN`
configure is a shell script. In a shell script, $(...) denotes command
substitution. So in order to evaluate $ac_top_srcdir at configure run
time, you would need to write
GIT_VERSION=`$ac_top_srcdir/GIT-VERSION-GEN`
You can use ${var} notation which is the same between shell and make.
> GIT_VERSION=`./GIT-VERSION-GEN`
> AC_SUBST(GIT_VERSION)
> AH_TEMPLATE([GIT_VERSION],
> [Git revision of this build])
>
> in my configure.ac file. It seems like AC_CONFIG_COMMAND runs too
> late for the variables to be put in config.h, is that right?
Yes.
Cheers,
Ralf
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