make/tests/scripts/variables/SHELL

#                                                                    -*-perl-*-

$description = "Test proper handling of SHELL.";

# Find the default value when SHELL is not set.  On UNIX it will be /bin/sh,
# but on other platforms who knows?
resetENV();
delete $ENV{SHELL};
$mshell = `echo 'all:;\@echo \$(SHELL)' | $make_path -f-`;
chop $mshell;

# According to POSIX, the value of SHELL in the environment has no impact on
# the value in the makefile.
# Note %extraENV takes precedence over the default value for the shell.

$extraENV{SHELL} = '/dev/null';
run_make_test('all:;@echo "$(SHELL)"', '', $mshell);

# According to POSIX, any value of SHELL set in the makefile should _NOT_ be
# exported to the subshell!  I wanted to set SHELL to be $^X (perl) in the
# makefile, but make runs $(SHELL) -c 'commandline' and that doesn't work at
# all when $(SHELL) is perl :-/.  So, we just add an extra initial /./ which
# works well on UNIX and seems to work OK on at least some non-UNIX systems.

$extraENV{SHELL} = $mshell;

run_make_test("SHELL := /./$mshell\n".'
all:;@echo "$(SHELL) $$SHELL"
', '', "/./$mshell $mshell");

# As a GNU make extension, if make's SHELL variable is explicitly exported,
# then we really _DO_ export it.

$extraENV{SHELL} = $mshell;

run_make_test("export SHELL := /./$mshell\n".'
all:;@echo "$(SHELL) $$SHELL"
', '', "/./$mshell /./$mshell");


# Test out setting of SHELL, both exported and not, as a target-specific
# variable.

$extraENV{SHELL} = $mshell;

run_make_test("all: SHELL := /./$mshell\n".'
all:;@echo "$(SHELL) $$SHELL"
', '', "/./$mshell $mshell");

$extraENV{SHELL} = $mshell;

run_make_test("all: export SHELL := /./$mshell\n".'
all:;@echo "$(SHELL) $$SHELL"
', '', "/./$mshell /./$mshell");

1;