Commit 744cd575c103166ed2b9e8ea1e8013f3e3e25bfe
2013-01-08T20:19:04
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>