gnats/669: Re: gnats/669: missing @XXX@ keyword substitutions in do_subst

[bug-gnats]

The following reply was made to PR gnats/669; it has been noted by GNATS.

From: Stephane Chazelas <address@hidden>
To: address@hidden
Cc: 
Subject: Re: gnats/669: missing @XXX@ keyword substitutions in do_subst
Date: Wed, 9 Aug 2006 18:45:59 +0100

 Actually, one can't do that this way reliably.
 
 for instance the 
 
 s,@ECHO_C@,$(ECHO_C),g
 
 doesn't work because it is expanded to
 
 s,@ECHO_C@,\c,g
 
 which should have been:
 
 s,@ECHO_C@,\\c,g
 
 The substitution done by autoconf take care of that by escaping
 the ",", "\" and "&" characters. It's not easy to do that
 portably with the Makefile approach.
 
 Is there any reason why the substitutions are done at the make
 time instead of at the configure time by the autoconf dedicated
 routine?
 
 regards,
 Stephane