configure: the testsuite shell must support 'test -e' and 'test ! -e'

* configure.ac: Require that the shell that is to be selected to run
the testsuite understands "set -e" and "set ! -e".

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

diff --git a/configure.ac b/configure.ac
index 2b5b057..55346d0 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -334,6 +334,11 @@ AC_DEFUN([_AM_CHECK_CANDIDATE_SHELL],
       [rm -f conftest-alias.sh],
       [rm -f conftest-alias.sh; am_score=1; break])
 
+    _AM_CHECK_SHELL_FEATURE([$1],
+      [supports "test -e"],
+      [test -e configure && test -e . && test ! -e nonesuch],
+      [], [am_score=1; break])
+
     break
   done])