source: kBuild/vendor/gnumake/current/tests/scripts/options/warn-undefined-variables@ 1989

#                                                                    -*-perl-*-

$description = "Test the --warn-undefined-variables option.";

$details = "Verify that warnings are printed for referencing undefined variables.";

# Without --warn-undefined-variables, nothing should happen
run_make_test('
EMPTY =
EREF = $(EMPTY)
UREF = $(UNDEFINED)

SEREF := $(EREF)
SUREF := $(UREF)

all: ; @echo ref $(EREF) $(UREF)',
              '', 'ref');

# With --warn-undefined-variables, it should warn me
run_make_test(undef, '--warn-undefined-variables',
              "#MAKEFILE#:7: warning: undefined variable `UNDEFINED'
#MAKEFILE#:9: warning: undefined variable `UNDEFINED'
ref");

1;