On 12/23/2011 12:07 AM, Stefano Lattarini wrote: > Hello autoconfers. > > While testing automake on Solaris 10, I've come across another "funny" > misbehaviour of /bin/sh: it trips up on here-documents that contains a > command substitution *and* are fed to a shell function: > And here is a patch to document the issue. Ok for master?
Regards, Stefano
>From 764bdd9a85979571ce19810fec4e1297e53d959b Mon Sep 17 00:00:00 2001 Message-Id: <764bdd9a85979571ce19810fec4e1297e53d959b.1324741666.git.stefano.lattar...@gmail.com> From: Stefano Lattarini <stefano.lattar...@gmail.com> Date: Sat, 24 Dec 2011 16:43:36 +0100 Subject: [PATCH] docs: issue with shell functions and here-documents on Solaris * doc/autoconf.texi (Here-Documents): Using a command substitution in a here-documents being fed to a shell function is unportable. Problem revealed by the automake testsuite: <http://lists.gnu.org/archive/html/automake-patches/2011-12/msg00149.html> --- ChangeLog | 8 ++++++++ doc/autoconf.texi | 13 +++++++++++++ 2 files changed, 21 insertions(+), 0 deletions(-) diff --git a/ChangeLog b/ChangeLog index 0f67f89..ea874f8 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,3 +1,11 @@ +2011-12-24 Stefano Lattarini <stefano.lattar...@gmail.com> + + docs: issue with shell functions and here-documents on Solaris + * doc/autoconf.texi (Here-Documents): Using a command substitution + in a here-documents being fed to a shell function is unportable. + Problem revealed by the automake testsuite: + <http://lists.gnu.org/archive/html/automake-patches/2011-12/msg00149.html> + 2011-12-07 Paul Eggert <egg...@cs.ucla.edu> AC_LANG_BOOL_COMPILE_TRY(C): port to g++ with warnings diff --git a/doc/autoconf.texi b/doc/autoconf.texi index d7d2231..dc938da 100644 --- a/doc/autoconf.texi +++ b/doc/autoconf.texi @@ -15239,6 +15239,19 @@ bash-2.04$ @kbd{cat <<EOF @end group @end example +Using command substitutions in a here-document that is fed to a shell +function is not portable. For example, with Solaris 10 @command{/bin/sh}: + +@example +$ @kbd{kitty () @{ cat; @}} +$ @kbd{kitty <<EOF +> `echo ok` +> EOF} +/tmp/sh199886: cannot open +$ @kbd{echo $?} +1 +@end example + Some shells mishandle large here-documents: for example, Solaris 10 @command{dtksh} and the UnixWare 7.1.1 Posix shell, which are derived from Korn shell version M-12/28/93d, mishandle braced variable -- 1.7.7.3
