#                                                                    -*-perl-*-
$description = "Test the load operator.";

$details = "Test dynamic loading of modules.";

# Don't do anything if this system doesn't support "load"
exists $FEATURES{'load'} or return -1;

my $cc = get_config('CC');
if (! $cc) {
    $verbose and print "Skipping load test: no CC defined\n";
    return -1;
}

# First build a shared object
# Provide both a default and non-default load symbol

unlink(qw(testload.c testload.so));

open(my $F, '> testload.c') or die "open: testload.c: $!\n";
print $F <<'EOF' ;
#include "gnumake.h"

char* getenv (const char*);

int plugin_is_GPL_compatible;

int testload_gmk_setup (unsigned int, gmk_floc *);
int explicit_setup (unsigned int, gmk_floc *);

int
testload_gmk_setup (unsigned int abi, gmk_floc *pos)
{
    (void)abi;
    (void)pos;
    gmk_eval ("TESTLOAD = implicit", 0);
    if (getenv("TESTAPI_KEEP"))
      return -1;
    return 1;
}

int
explicit_setup (unsigned int abi, gmk_floc *pos)
{
    (void)abi;
    (void)pos;
    gmk_eval ("TESTLOAD = explicit", 0);
    if (getenv("TESTAPI_KEEP"))
      return -1;
    return 1;
}
EOF
close($F) or die "close: testload.c: $!\n";

# Make sure we can compile

my $cppflags = get_config('CPPFLAGS') . ($srcdir ? " -I$srcdir/src" : '');
my $cflags = get_config('CFLAGS') . ' -fPIC';
my $ldflags = get_config('LDFLAGS') . ' -shared';
my $sobuild = "\"$cc\" $cppflags $cflags $ldflags -o testload.so testload.c";

my $clog = `$sobuild 2>&1`;
if ($? != 0) {
    $verbose and print "Failed to build testload.so:\n$sobuild\n$clog";
    return -1;
}

# TEST 1
run_make_test(q!
PRE := $(.LOADED)
load testload.so
POST := $(.LOADED)
all: ; @echo pre=$(PRE) post=$(POST) $(TESTLOAD)
!,
              '--warn-undefined-variables', "pre= post=testload.so implicit\n");

# TEST 2
# Load using an explicit function
run_make_test(q!
PRE := $(.LOADED)
load ./testload.so(explicit_setup)
POST := $(.LOADED)
all: ; @echo pre=$(PRE) post=$(POST) $(TESTLOAD)
!,
              '', "pre= post=testload.so explicit\n");

# TEST 3
# Check multiple loads
run_make_test(q!
PRE := $(.LOADED)
load ./testload.so
load testload.so(explicit_setup)
POST := $(.LOADED)
all: ; @echo pre=$(PRE) post=$(POST) $(TESTLOAD)
!,
              '', "pre= post=testload.so implicit\n");

# TEST 4
# Check auto-rebuild of loaded file that's out of date
utouch(-10, 'testload.so');
touch('testload.c');

run_make_test(q!
PRE := $(.LOADED)
load ./testload.so
POST := $(.LOADED)
all: ; @echo pre=$(PRE) post=$(POST) $(TESTLOAD)
testload.so: testload.c ; @echo "rebuilding $@"; !.$sobuild,
              '', "rebuilding testload.so\npre= post=testload.so implicit\n");

# TEST 5
# Check auto-rebuild of loaded file when it doesn't exist
unlink('testload.so');

run_make_test(q!
PRE := $(.LOADED)
-load ./testload.so(explicit_setup)
POST := $(.LOADED)
all: ; @echo pre=$(PRE) post=$(POST) $(TESTLOAD)
%.so: %.c ; @echo "rebuilding $@"; !.$sobuild,
              '', "rebuilding testload.so\npre= post=testload.so explicit\n");

# sv 63044.
# Test that the loaded shared object is present in .LOADED when the setup
# routine returns -1.
$ENV{TESTAPI_KEEP} = 1;
run_make_test(q!
PRE := $(.LOADED)
load testload.so
POST := $(.LOADED)
all: ; @echo pre=$(PRE) post=$(POST) $(TESTLOAD)
!,
              '--warn-undefined-variables', "pre= post=testload.so implicit\n");

# Check that we don't auto-rebuild of loaded file that's out of date
# if we return -1 from the setup
utouch(-10, 'testload.so');
touch('testload.c');

$ENV{TESTAPI_KEEP} = 1;
run_make_test(q!
PRE := $(.LOADED)
load ./testload.so
POST := $(.LOADED)
all: ; @echo pre=$(PRE) post=$(POST) $(TESTLOAD)
testload.so: testload.c ; @echo "rebuilding $@"; !.$sobuild,
              '', "pre= post=testload.so implicit\n");

# Check using load as a target or variable name
run_make_test(q!
load: ; @echo $@
-load&: ; @echo $@
!,
              "", "load\n");

run_make_test(q!
load : ; @echo $@
-load &: ; echo $@
!,
              "", "load\n");

run_make_test(q!
load = @echo $@
all: ; $(load)
load |: ; echo $@
!,
              "", "all\n");

# Verify that load does not start with TAB

run_make_test(q!
#TAB#load ./testload.so
all:;@echo hi
!,
              '', "#MAKEFILE#:2: warning: load lines cannot start with TAB\nhi\n");

run_make_test(q!
#TAB#-load ./testload.so
all:;@echo hi
!,
              '', "#MAKEFILE#:2: warning: -load lines cannot start with TAB\nhi\n");

# This tells the test driver that the perl test script executed properly.
1;