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b670a66a
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2013-01-11T18:26:03
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tests: can fake a compiler not grasping "-c -o" -- globally in all tests
The ability to easily do so will be quite important in upcoming changes
about C compilation handling and semantics of the 'subdir-objects'
option. Refer to the extensive discussion about automake bug#13378 for
more details: <http://debbugs.gnu.org/cgi/bugreport.cgi?bug=13378>.
See also commit 'v1.13.1-34-g744cd57' of 2013-01-08, "coverage: compile
rules used "-c -o" also with losing compilers".
* t/ax/cc-no-c-o.in: New, a "C compiler" that chokes when the '-c' and
'-o' options are passed together to it on the command line.
* Makefile.am (t/ax/cc-no-c-o): Generate this script from it.
(noinst_SCRIPTS, CLEANFILES): Add it.
(EXTRA_DIST): Add 't/ax/cc-no-c-o.in'.
(check-cc-no-c-o): New target, runs the whole testsuite with 'cc-no-c-o'
as the C compiler (bot GNU and non-GNU).
* .gitignore: Update.
* t/ccnoco.sh: Use the new script instead of duplicating it.
* t/ccnoco3.sh: Likewise.
* t/ccnoco4.sh: Likewise.
* t/self-check-cc-no-c-o.sh: New testsuite self-check.
* t/list-of-tests.mk: Adjust.
Signed-off-by: Stefano Lattarini <stefano.lattarini@gmail.com>
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6b31158c
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2013-01-09T19:57:27
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plans: we want to active subdir-objects unconditionally in automake 1.14
See automake bug#13378.
* PLANS/subdir-objects.txt: New.
* t/ccnoco4.sh: Improve heading comments a little.
Signed-off-by: Stefano Lattarini <stefano.lattarini@gmail.com>
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744cd575
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2013-01-08T20:19:04
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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>
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