bug#70822: flymake mishandles GCC diagnostics in en_US.UTF-8 locale

[Paul Eggert <eggert@cs.ucla.edu>]

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> AFAICT, flymake-tests.el injects LC_ALL=C into process-environment (in
> flymake-tests--call-with-fixture called from
> flymake-tests--with-flymake), so why doesn't that affect the locale
> under which the test runs?

I don't know. But shouldn't flymake also work when LC_ALL='en_US.UTF-8'? 
That is, instead of trying (but evidently failing) to check only 
LC_ALL='C', shouldn't flymake-tests also check the LC_ALL='en_US.UTF-8' 
case?


> And could you perhaps show the error message reported by the failing
> test(s) in that case?

The contents of test/lisp/progmodes/flymake-tests.log are attached.

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Running 9 tests (2024-05-08 10:01:37-0700, selector `(not (or (tag :expensive-test) (tag :unstable)))')
   passed  1/9  different-diagnostic-types (1.151769 sec)
   passed  2/9  dummy-backends (1.002037 sec)
   passed  3/9  eob-region-and-trailing-newline (0.000190 sec)
Test included-c-header-files backtrace:
  signal(ert-test-failed (((should (eq 'flymake-warning (face-at-point
  ert-fail(((should (eq 'flymake-warning (face-at-point))) :form (eq f
  #f(compiled-function () #<bytecode 0x1bee812822f86a40>)()
  flymake-tests--call-with-fixture(#f(compiled-function () #<bytecode 
  #f(compiled-function () #<bytecode -0x1170404b2f5c8feb>)()
  #f(compiled-function () #<bytecode 0x899bb4b220fad07>)()
  handler-bind-1(#f(compiled-function () #<bytecode 0x899bb4b220fad07>
  ert--run-test-internal(#s(ert--test-execution-info :test #s(ert-test
  ert-run-test(#s(ert-test :name included-c-header-files :documentatio
  ert-run-or-rerun-test(#s(ert--stats :selector ... :tests ... :test-m
  ert-run-tests((not (or (tag :expensive-test) (tag :unstable))) #f(co
  ert-run-tests-batch((not (or (tag :expensive-test) (tag :unstable)))
  ert-run-tests-batch-and-exit((not (or (tag :expensive-test) (tag :un
  eval((ert-run-tests-batch-and-exit '(not (or (tag :expensive-test) (
  command-line-1(("-L" ":." "-l" "ert" "--eval" "(setq treesit-extra-l
  command-line()
  normal-top-level()
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 (1.045034 sec) at lisp/progmodes/flymake-tests.el:168
   passed  5/9  perl-backend (1.034836 sec)
   passed  6/9  recurrent-backend (1.004512 sec)
   passed  7/9  ruby-backend (1.076380 sec)
   passed  8/9  warning-predicate-function-gcc (1.088740 sec)
   passed  9/9  warning-predicate-rx-gcc (1.071722 sec)

Ran 9 tests, 8 results as expected, 1 unexpected (2024-05-08 10:01:46-0700, 8.595761 sec)

1 unexpected results:
   FAILED  included-c-header-files