tests: simpler workaround for shells losing the exit status in exit trap

Now that we can assume our tests are run by a decent POSIX shell, we
can simplify our workaround aimed at having the exit status propagated
correctly to the code in the exit trap.  Unfortunately, we cannot
dispense with such a workaround altogether, because it's still required
by some shells we need to support (at least Solaris 10 /bin/ksh and
/usr/xpg4/bin/sh).

For more information about the need of that workaround, see the entry
about 'trap' in the section "Limitations of Shell Builtins" in the
Autoconf manual:
<http://www.gnu.org/software/autoconf/manual/autoconf.html#trap>

The new workaround has been tested successfully with the following
shells:

  - Bash 4.1
  - Bash 3.2
  - Bash 3.0
  - Bash 2.05b
  - dash 0.5.5.1
  - dash 0.5.2
  - AT&T Ksh 93u (from official Debian package)
  - MirBSD Korn Shell 40.2 (from official Debian package)
  - Solaris 9, 10 and 11 /bin/ksh
  - Solaris 9, 10 and 11 /usr/xpg4/bin/sh
  - NetBSD 5.1 /bin/sh
  - NetBSD 5.1 /bin/ksh

* t/ax/test-init.sh (Exit): Rename ...
(_am_exit): ... like this.
(exit): New alias for '_am_exit'.  We cannot simply redefine 'exit'
as a shell function, because some shells (dash 0.5.5.1, Solaris 10
/bin/ksh and /usr/xpg4/bin/sh) do not allow it.
(_am_exit, trap): Add extra escaping for 'exit' calls, to ensure we
really invoke the 'exit' builtin and not our alias with the same
name.
* configure.ac: Check that the shell selected to run our testsuite
supports aliases named like shell builtins.
* t/REAMDE: Adjust.
* All tests: Adjust, by simply using 'exit' instead of 'Exit'.
* t/self-check-explicit-skips.sh: Adjust: the first usage of 'exit'
after it has been redefined as an alias must be on a new line w.r.t.
that where the alias is defined, in order for the redefinition to be
honored.
* syntax-checks.mk (sc_tests_Exit_not_exit): Delete.
(sc_tests_exit_not_Exit): New.
(syntax_check_rules): Adjust.
(sc_tests_automake_fails): Simplify the recipe a little.
* Several tests: Remove now useless spurious quoting once required
to placate the 'sc_tests_Exit_not_exit' maintainer check.
* gen-testsuite-part: Likewise.  Also, avoid uses of 'Exit' in the
generated scripts.

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

1 files changed, 4 insertions, 4 deletions

diff --git a/t/tap-doc2.sh b/t/tap-doc2.sh
index 0607112d3..f874ff853 100755
--- a/t/tap-doc2.sh
+++ b/t/tap-doc2.sh
@@ -19,7 +19,7 @@
 # with the Automake test harness".
 
 am_create_testdir=empty
-. ./defs || Exit 1
+. ./defs || exit 1
 
 cat > Makefile.am <<'END'
 TEST_LOG_DRIVER = env AM_TAP_AWK='$(AWK)' $(SHELL) \
@@ -73,7 +73,7 @@ mkdir build-aux
 cp "$am_scriptdir"/tap-driver.sh build-aux \
   || framework_failure_ "fetching the perl TAP driver"
 
-(export AUTOMAKE ACLOCAL AUTOCONF && $AUTORECONF -vi) || Exit 1
+(export AUTOMAKE ACLOCAL AUTOCONF && $AUTORECONF -vi) || exit 1
 
 ./configure --help # Sanity check.
 ./configure || skip_ "configure failed"
@@ -83,7 +83,7 @@ case $MAKE in *\ -j*) skip_ "can't work easily with concurrent make";; esac
 # Prevent Sun Distributed Make from trying to run in parallel.
 DMAKE_MODE=serial; export DMAKE_MODE
 
-$MAKE check >stdout && { cat stdout; Exit 1; }
+$MAKE check >stdout && { cat stdout; exit 1; }
 cat stdout
 
 cat > exp <<'END'
@@ -109,7 +109,7 @@ grep '^Please report to bug-automake@gnu\.org$' stdout
 env \
   TESTS='foo.test baz.test' \
   TEST_LOG_DRIVER_FLAGS='--comments --ignore-exit' \
-  $MAKE -e check >stdout || { cat stdout; Exit 1; }
+  $MAKE -e check >stdout || { cat stdout; exit 1; }
 
 cat > exp <<'END'
 PASS: foo.test 1 - Swallows fly