Re: Using $program_transform_name from ‘configure’

[Bob Friesenhahn]

On Wed, 23 Apr 2014, Ludovic Courtès wrote:

> Hello,
>
> $program_transform_name is apparently meant to be used in makefiles
> only, as suggested in the manual and in this comment from ‘configure’:
>
> --8<---------------cut here---------------start------------->8---
> # Double any \ or $.
> # By default was `s,x,x', remove it if useless.
> ac_script='s/[\\$]/&&/g;s/;s,x,x,$//'
> program_transform_name=`$as_echo "$program_transform_name" | sed "$ac_script"`
> --8<---------------cut here---------------end--------------->8---
>
> The doubled $ and \ make it impossible to use it directly within
> configure.ac.
>
> What’s the recommended way to use it in configure.ac?

This is what I do in GraphicsMagick:


#
# program_transform_name is formed for use in a Makefile, so create a
# modified version for use in a shell script.
configure_transform_name=`echo ${program_transform_name} | sed 's,\\$\\$,$,'`
GMDelegateDefault=`echo gm | sed ${configure_transform_name}`

As far as I am aware, it has never caused a problem.

Bob
--
Bob Friesenhahn
address@hidden, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/