[Bug c/77965] -Wduplicated-cond should find duplicated condition / identical expressions of form "a || a" or "a && a"

[egall at gwmail dot gwu.edu]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77965

Eric Gallager <egall at gwmail dot gwu.edu> changed:

           What    |Removed                     |Added
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                 CC|                            |egall at gwmail dot gwu.edu

--- Comment #1 from Eric Gallager <egall at gwmail dot gwu.edu> ---
Use -Wlogical-op:

$ /usr/local/bin/gcc -c -Wall -Wextra -pedantic -Wlogical-op -Wduplicated-cond
-Wtautological-compare logical_op.c 
logical_op.c: In function ‘foo’:
logical_op.c:5:17: warning: logical ‘or’ of equal expressions [-Wlogical-op]
  return (x == 5 || x == 5) ? 1 : 0;
                 ^~