eval

来自「make debug tool. You can use this tool t」· 代码 · 共 92 行

#                                                                    -*-perl-*-

$description = "Test the eval function.";

$details = "This is a test of the eval function in GNU make.
This function will evaluate inline makefile syntax and incorporate the
results into its internal database.\n";

open(MAKEFILE,"> $makefile");

print MAKEFILE <<'EOF';
define Y
  all:: ; @echo $AA
  A = B
endef

X = $(eval $(value Y))

$(eval $(shell echo A = A))
$(eval $(Y))
$(eval A = C)
$(eval $(X))
EOF

close(MAKEFILE);

&run_make_with_options($makefile, "", &get_logfile);

# Create the answer to what should be produced by this Makefile
$answer = "AA\nBA\n";

&compare_output($answer,&get_logfile(1));

# Test to make sure defining variables when we have extra scope pushed works
# as expected.

$makefile2 = &get_tmpfile;

open(MAKEFILE,"> $makefile2");

print MAKEFILE <<'EOF';
VARS = A B

VARSET = $(1) = $(2)

$(foreach v,$(VARS),$(eval $(call VARSET,$v,$v)))

all: ; @echo A = $(A) B = $(B)
EOF

close(MAKEFILE);

&run_make_with_options($makefile2, "", &get_logfile);

# Create the answer to what should be produced by this Makefile
$answer = "A = A B = B\n";

&compare_output($answer,&get_logfile(1));

# Test to make sure eval'ing inside conditionals works properly

$makefile3 = &get_tmpfile;

open(MAKEFILE,"> $makefile3");

print MAKEFILE <<'EOF';
FOO = foo

all:: ; @echo it

define Y
  all:: ; @echo worked
endef

ifdef BAR
$(eval $(Y))
endif

EOF

close(MAKEFILE);

&run_make_with_options($makefile3, "", &get_logfile);
$answer = "it\n";
&compare_output($answer,&get_logfile(1));

&run_make_with_options($makefile3, "BAR=1", &get_logfile);
$answer = "it\nworked\n";
&compare_output($answer,&get_logfile(1));

1;