Re: libtool/config.status issue on IRIX

[Bob Friesenhahn]

On Thu, 1 Jan 2004, Joe Orton wrote:

> Following up on the issue reported by Bob Friesenhahn here:
>
> http://mail.gnu.org/archive/html/libtool/2003-11/msg00131.html
>
> The suspect eval line in config.status has lost some of the necessary
> backslashes:

It seems that this qoting rules is being applied:

     command  substitution.  If  the  command  substitution  lies
     within a pair of double  quotes  ("  ...`  ...`  ...  "),  a
     backslash  used  to  escape  a  double  quote  (\")  will be
     removed; otherwise, it will be left intact.

This is part of the Solaris description for how text enclosed by "" is
treated, not part of the << quoting description.  Apparently IRIX and
AIX apply the same rules for "here" text.

It seems that changing \" to just " for the parts within the
enclosing quotes yields the desired results for both environments.

Bob

>
> IRIX config.status:
> ...
>   # Now quote all the things that may contain metacharacters while being
>   # careful not to overquote the AC_SUBSTed values.  We take copies of the
>   # variables and quote the copies for generation of the libtool script.
>   for var in SED SHELL echo AR AR_FLAGS LTCC EGREP RANLIB LN_S NM ...
>
> ....
>     *)
>       eval "lt_$var=\\"\`\$echo "X\$$var" | \$Xsed -e 
> "\$sed_quote_subst"\`\\""
>       ;;
>     esac
>   done
>
> where the same fragment from a config.status created on Linux looks
> like:
>
>     *)
>       eval "lt_$var=\\\"\`\$echo \"X\$$var\" | \$Xsed -e 
> \"\$sed_quote_subst\"\`\\\""
>       ;;
>     esac
>   done
>
> configure selects ksh on this platform (at least using autoconf HEAD).
>
> a minimal repro case for the different quoting, comparing sh with ksh:
>
> whisk 45% uname -a
> IRIX whisk 6.2 03131015 IP22
> whisk 46% cat frag.sh
> #! /bin/sh
> cat >foo.out <<_ACEOF
> eval "lt_\$var=\\\\\"\\\`\\\$echo \"X\\\$\$var\" | \\\$Xsed -e 
> \"\\\$sed_quote_subst\"\\\`\\\\\""
> _ACEOF
> cat foo.out
> whisk 47% sh ./frag.sh
> eval "lt_$var=\\\"\`\$echo \"X\$$var\" | \$Xsed -e 
> \"\$sed_quote_subst\"\`\\\""
> whisk 48% ksh ./frag.sh
> eval "lt_$var=\\"\`\$echo "X\$$var" | \$Xsed -e "\$sed_quote_subst"\`\\""
>
>
>
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======================================
Bob Friesenhahn
address@hidden
http://www.simplesystems.org/users/bfriesen