[MacPorts] #68638: bash @5.2.15: When a "command not found" situation happens, Bash prints errors and ends with "Abort Trap: 6" instead of printing "Command not found"

[MacPorts]

#68638: bash @5.2.15: When a "command not found" situation happens, Bash prints
errors and ends with "Abort Trap: 6" instead of printing "Command not
found"
----------------------+----------------------
  Reporter:  some1so  |      Owner:  raimue
      Type:  defect   |     Status:  assigned
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:  bash     |
----------------------+----------------------

Comment (by msbit):

 Replying to [comment:22 bradleyCPA]:
 > I suppose the problem lies at the intersection of gettext() usage after
 fork() and before exec() in bash [execute_cmd.c in bash source] in
 combination with setlocale() function replacement [libintl.h, "define
 setlocale libintl_setlocale", gettext-runtime/intl/setlocale.c in gettext
 source]. It seems that there must be some scenario or scenarios where
 calling into Apple's APIs in the gettext-provided setlocale() replacement
 spawns a thread so that after the fork() [in bash] calling back into
 Apple's APIs using CFLocaleCopyPreferredLanguages (or similar) in the
 gettext() call results in the forked process terminating.

 From what I can tell, this is what happens:

 {{{
 int main() {
   // via bash`reset_locale_vars > libintl.8.dylib`libintl_setlocale >
 .`_libintl_locale_name_default
   CFPreferencesCopyAppValue(CFSTR("AppleLocale"),
 kCFPreferencesCurrentApplication);
   if (fork() == 0) {
     // via bash`execute_disk_command > libintl.8.dylib`libintl_gettext >
 .`libintl_dcgettext > .`libintl_dcigettext > .`guess_category_value >
 .`_libintl_language_preferences_default
     CFLocaleCopyPreferredLanguages();
   }
 }
 }}}

 `CFPreferencesCopyAppValue` spins up a thread (one of the GCD worker
 threads) which triggers this forced crash whenever an objc `+initialize`
 method is called (as occurs within `CFLocaleCopyPreferredLanguages`).

-- 
Ticket URL: <https://trac.macports.org/ticket/68638#comment:25>
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