On 02/28/2012 05:51 PM, Eric Blake wrote: > [adding autoconf] > > On 02/28/2012 09:42 AM, Stefano Lattarini wrote: > >>> Ah, likely the famous ksh bug with "$@" and empty arguments: >>> >>> <http://lists.gnu.org/archive/html/automake-patches/2009-12/msg00037.html> > >> See automake bug#10898. >> >> At least the AT&T and OpenSolaris versions of the Korn shell have a >> strange bug regarding the expression ${1+"$@"}: when exactly *one* >> empty argument is passed to a shell function, inside that function >> the expression ${1+"$@"} will expand to *nothing*, rather than to >> to the single empty string, as one would expect. This was causing >> a spurious failure in our testsuite when a shell suffering of this >> bug was used to run the test cases. > > Yuck - this sounds like it should be documented in the autoconf manual. > Is it only shell functions that are affected, but global use of > ${1+"$@"} is still safe? > I can't be sure anymore -- the only affected shell I've ever encountered was Debian's /bin/ksh (from the Debian package 'ksh' - "The real, AT&T version of the Korn shell"), and the bugs has been fixed in it meanwhile: $ /bin/ksh -c 'foo () { for i in ${1+"$@"}; do echo ":$i:"; done; }; foo ""' :: Sorry, Stefano _______________________________________________ Autoconf mailing list Autoconf@xxxxxxx https://lists.gnu.org/mailman/listinfo/autoconf
