bug#71749: 29.4; Test failure in flymake-tests.el with GCC 14.1.1

[Eli Zaretskii <eliz@gnu.org>]

> From: Ulrich Müller <ulm@gentoo.org>
> Date: Mon, 24 Jun 2024 15:33:00 +0200
> 
> Emacs 29.4 fails tests with GCC 14.1.1 (Gentoo package
> sys-devel/gcc-14.1.1_p20240518):
> 
> HOME=/nonexistent LANG=C EMACS_TEST_DIRECTORY=/tmp/portage/app-editors/emacs-29.4/work/emacs-29.4/test   "../src/emacs" --module-assertions --no-init-file --no-site-file --no-site-lisp -L ":."  \
>   -l ert --eval '(setq ert-batch-backtrace-right-margin nil)' -l src/emacs-module-tests \
>   --batch --eval '(ert-run-tests-batch-and-exit (quote (not (or (tag :expensive-test) (tag :unstable) (tag :nativecomp)))))' > src/emacs-module-tests.log 2>&1 || { STAT=$?; cat src/emacs-module-tests.log; exit $STAT; }
> Running 9 tests (2024-06-24 15:21:29+0200, selector ‘(not (or (tag :expensive-test) (tag :unstable) (tag :nativecomp)))’)
>    passed  1/9  different-diagnostic-types (1.294288 sec)
>    passed  2/9  dummy-backends (1.002899 sec)
>    passed  3/9  eob-region-and-trailing-newline (0.000172 sec)
> Test included-c-header-files backtrace:
> [... backtrace omitted ...]
> 
> Test included-c-header-files condition:
>     (ert-test-failed
>      ((should
>        (eq 'flymake-warning
> 	    (face-at-point)))
>       :form
>       (eq flymake-warning flymake-error)
>       :value nil))
>    FAILED  4/9  included-c-header-files (1.067014 sec) at lisp/progmodes/flymake-tests.el:168
>    passed  5/9  perl-backend (1.025399 sec)
>    passed  6/9  recurrent-backend (1.003033 sec)
>    passed  7/9  ruby-backend (1.019991 sec)
>    passed  8/9  warning-predicate-function-gcc (1.020760 sec)
>    passed  9/9  warning-predicate-rx-gcc (1.021962 sec)
> 
> Ran 9 tests, 8 results as expected, 1 unexpected (2024-06-24 15:21:38+0200, 8.529267 sec)
> 
> 1 unexpected results:
>    FAILED  included-c-header-files  ((should (eq 'flymake-warning (face-at-point))) :form (eq flymake-warning flymake-error) :value nil)
> 
> make[3]: *** [Makefile:180: lisp/progmodes/flymake-tests.log] Error 1
> make[3]: Leaving directory '/tmp/portage/app-editors/emacs-29.4/work/emacs-29.4/test'
> make[2]: [Makefile:340: check-doit] Error 2 (ignored)
> 
> SUMMARY OF TEST RESULTS
> -----------------------
> Files examined: 466
> Ran 6977 tests, 6757 results as expected, 1 unexpected, 219 skipped
> 1 files contained unexpected results:
>   lisp/progmodes/flymake-tests.log
> make[2]: *** [Makefile:341: check-doit] Error 1
> make[2]: Leaving directory '/tmp/portage/app-editors/emacs-29.4/work/emacs-29.4/test'
> make[1]: *** [Makefile:310: check] Error 2
> make[1]: Leaving directory '/tmp/portage/app-editors/emacs-29.4/work/emacs-29.4/test'
> make: *** [Makefile:1105: check] Error 2
> 
> 
> Attached patch (for the emacs-30 branch) fixes the problem for me:

Thanks, please install on the emacs-30 branch.