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:

Thanks for noticing this difference and pointing it out!  I could
easily have gone a day without noticing that the code being executed
was different between the working OS and the "broken" OS.  The
question now is what is the portable fix?  What is the effect if the
backslashes are unquoted?

I am curious to know which OS is correct according to POSIX.

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