coverage: compile rules used "-c -o" also with losing compilers

If the 'subdir-objects' option is used, Automake-generated rules for
C compilation pass both the "-c" and "-o" options to the C compiler,
*unconditionally*.  There are some compilers that choke on such an
usage, but the AM_PROG_CC_C_O macro takes care of them (it does so by
redefining $CC to use the Automake-provided 'compile' wrapper script
automatically, if a losing compiler is detected at configure runtime).

Unfortunately, in case the 'subdir-objects' option is specified in a
Makefile.am, but all the source files resided anyway in the top-level
directory (relative to the Makefile.am), Automake do *not* complain
if AM_PROG_CC_C_O wasn't invoked in 'configure.ac' -- all the while
still passing "-c -o" to the compiler invocations.  This could cause
compilation failures with losing compilers if the user forget to call
AM_PROG_CC_C_O in 'configure.ac' (and Automake would not warn him of
the issue).

Expose this bug in the testsuite.

Issue identified by Nick Bowler in the discussion on automake bug#13378:
<http://debbugs.gnu.org/cgi/bugreport.cgi?bug=13378#35>
<http://debbugs.gnu.org/cgi/bugreport.cgi?bug=13378#44>

* t/ccnoco4.sh: New test.
* t/list-of-tests.mk (XFAIL_TESTS, handwritten_TESTS): List it.

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

1 files changed, 2 insertions, 0 deletions

diff --git a/t/list-of-tests.mk b/t/list-of-tests.mk
index f3e996325..aef3730e2 100644
--- a/t/list-of-tests.mk
+++ b/t/list-of-tests.mk
@@ -30,6 +30,7 @@ t/pm/Version3.pl
 
 XFAIL_TESTS = \
 t/all.sh \
+t/ccnoco4.sh \
 t/cond17.sh \
 t/gcj6.sh \
 t/override-conditional-2.sh \
@@ -209,6 +210,7 @@ t/canon-name.sh \
 t/ccnoco.sh \
 t/ccnoco2.sh \
 t/ccnoco3.sh \
+t/ccnoco4.sh \
 t/check.sh \
 t/check2.sh \
 t/check4.sh \