tests: work around a ksh bug w.r.t. ${1+"$@"}

Fixes automake bug#10898.  See also the older (much older) thread:
<http://lists.gnu.org/archive/html/automake-patches/2009-12/msg00036.html>

At least the AT&T and OpenSolaris versions of the Korn shell, as well
as the /bin/sh from OpenIndiana 11, have a strange bug regarding the
expansion of ${1+"$@"}: when exactly *one empty* argument is passed to
a script run by one of this shells, inside that script ${1+"$@"} will
expand to *nothing*, rather than to to the single empty string, as
one would expect (OTOH, $# will correctly expand to 1).  This buggy
behaviour was causing a spurious failure in our testsuite (test 6 in
't/automake-cmdline.tap').  Work around it.

* t/wrap/automake.in: Here.

Signed-off-by: Stefano Lattarini <stefano.lattarini@gmail.com>

diff --git a/t/wrap/automake.in b/t/wrap/automake.in
index 14f437f..b77177c 100644 (file)
--- a/t/wrap/automake.in
+++ b/t/wrap/automake.in
@@ -27,4 +27,10 @@ fi
 
 perllibdir="@abs_top_builddir@/lib@PATH_SEPARATOR@@abs_top_srcdir@/lib"
 export perllibdir
-exec "@abs_top_builddir@/automake" "--libdir=@abs_top_srcdir@/lib" ${1+"$@"}
+# Don't trust ${1+"$@"}: it has subtle bugs in some Korn shells (for very
+# corner case only admittedly, but those have already bitten us -- see
+# automake bug#10898).
+case $# in
+  0) exec "@abs_top_builddir@/automake" "--libdir=@abs_top_srcdir@/lib";;
+  *) exec "@abs_top_builddir@/automake" "--libdir=@abs_top_srcdir@/lib" "$@";;
+esac