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[Bug objc/77428] New: incorrect 'set but not used' warning with @throw


https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77428

            Bug ID: 77428
           Summary: incorrect 'set but not used' warning with @throw
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Severity: minor
          Priority: P3
         Component: objc
          Assignee: unassigned at gcc dot gnu.org
          Reporter: vries at gcc dot gnu.org
  Target Milestone: ---

test.m:
...
#import <objc/Object.h>
#import <stdio.h>

void
foo2 (void)
{
  printf ("foo2\n");
}

int
main (void)
{
  id o = nil;

  @try {
    printf ("before throw\n");
    @throw o;
    printf ("after throw\n");

  } @catch (id ue) {
    if (ue != nil)
      foo2 ();
    else
      printf ("not foo2\n");
  }

  return 0;
}
...

$ gcc test.m -fobjc-exceptions -lobjc -Wall:
...
test.m: In function ‘main’:
test.m:13:6: warning: variable ‘o’ set but not used [-Wunused-but-set-variable]
   id o = nil;
      ^
...

The warning is incorrect, variable 'o' is in fact used by @throw.

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