condifomit.c: (in function cond1)
condifomit.c:11:6: Conditionals with Omitted Operands is not supported by ISO
                      C99
condifomit.c: (in function cond2)
condifomit.c:17:9: Conditionals with Omitted Operands is not supported by ISO
                      C99
condifomit.c: (in function test_use_before_definition)
condifomit.c:27:17: Variable i used before definition
condifomit.c:27:17: Conditionals with Omitted Operands is not supported by ISO
                       C99

Finished checking --- 4 code warnings, as expected

Command Line: Setting +gnuextensions redundant with current value
condifomit.c: (in function test_use_before_definition)
condifomit.c:27:17: Variable i used before definition

Finished checking --- 1 code warning, as expected