Clean up memory leak warnings from ASAN and Valgrind

* src/main.c (main): Add "sanitize" to .FEATURES if ASAN is enabled.
* src/expand.c (expand_variable_output): Remember "recursive" setting
in case it's changed by the expansion of the variable.
* src/file.c (rehash_file): If we drop a file from the global 'files'
hash, remember it in rehashed_files.  We can't free it because it's
still being referenced (callers will invoke check_renamed()) but
it will be a leak since it's no longer referenced by 'files'.
* src/remake.c (update_file_1): If we drop a dependency, remember it
in dropped_list.  We can't free it because it's still being referenced
by callers but it will be a leak since it's no longer referenced as
a prerequisite.
* tests/scripts/functions/guile: Don't run Guile tests when ASAN is
enabled.
* tests/scripts/functions/wildcard: Enabling ASAN causes glob(3) to
break!  Don't run this test.
* tests/scripts/features/exec: Valgrind's exec() doesn't support
scripts with no shbang.
* tests/scripts/jobserver: Valgrind fails if TMPDIR is set to an
invalid directory: skip those tests.
* tests/scripts/features/output-sync: Ditto.
* tests/scripts/features/temp_stdin: Ditto.

tests/scripts/features/exec

@@ -15,7 +15,11 @@ my $details = "The various shells that this test uses are the default"
 $port_type eq 'UNIX' or return -1;
 $^O =~ /cygwin/ and return -1;
 
-my @shbangs = ('', '#!/bin/sh', "#!$perl_name");
+my @shbangs = ('#!/bin/sh', "#!$perl_name");
+
+# The exec in Valgrind's VM doesn't allow starting commands without any shbang
+$valgrind or push @shbangs, '';
+
 my @shells = ('', 'SHELL=/bin/sh');
 
 # Try whatever shell the user has, as long as it's not a C shell.

tests/scripts/features/jobserver

@@ -168,7 +168,8 @@ if ($port_type ne 'W32') {
                   "all 1\nall 2\nrecurse");
 }
 
-if (exists $FEATURES{'jobserver-fifo'}) {
+# We can't reset TMPDIR to something invalid when using valgrind
+if (exists $FEATURES{'jobserver-fifo'} && !$valgrind) {
   # sv 62908.
   # Test that when mkfifo fails, make switches to pipe and succeeds.
   # Force mkfifo to fail by attempting to create a fifo in a non existent

tests/scripts/features/output-sync

@@ -380,17 +380,23 @@ unlink($fout);
 # Create a non-writable temporary directory.
 # Run the test twice, because run_make_test cannot match a regex against a
 # multiline input.
-my $tdir = 'test_tmp_dir';
-mkdir($tdir, 0500);
-$ENV{'TMPDIR'} = $tdir;
 
-run_make_test(q!
+# If we do this Valgrind fails because it cannot write temp files... the docs
+# don't describe any way to tell valgrind to use a directory other than TMPDIR.
+
+if (!$valgrind) {
+    my $tdir = 'test_tmp_dir';
+    mkdir($tdir, 0500);
+    $ENV{'TMPDIR'} = $tdir;
+
+    run_make_test(q!
 all:; $(info hello, world)
 !, '-Orecurse', "/suppressing output-sync/");
 
-run_make_test(undef, '-Orecurse', "/#MAKE#: 'all' is up to date./");
+    run_make_test(undef, '-Orecurse', "/#MAKE#: 'all' is up to date./");
 
-rmdir($tdir);
+    rmdir($tdir);
+}
 }
 
 # This tells the test driver that the perl test script executed properly.

tests/scripts/features/temp_stdin

@@ -115,16 +115,21 @@ rmdir($tmakedir);
 # makefile from stdin to a temporary file.
 # Create a non-writable temporary directory.
 
-my $tdir = 'test_tmp_dir';
-mkdir($tdir, 0500);
-$ENV{'TMPDIR'} = $tdir;
-close(STDIN);
-open(STDIN, "<", 'input.mk') || die "$0: cannot open input.mk for reading: $!";
+# If we do this Valgrind fails because it cannot write temp files... the docs
+# don't describe any way to tell valgrind to use a directory other than TMPDIR.
 
-run_make_test(q!
+if (!$valgrind) {
+    my $tdir = 'test_tmp_dir';
+    mkdir($tdir, 0500);
+    $ENV{'TMPDIR'} = $tdir;
+    close(STDIN);
+    open(STDIN, "<", 'input.mk') || die "$0: cannot open input.mk for reading: $!";
+
+    run_make_test(q!
 all:; $(info hello, world)
 !, '-f-', '/cannot store makefile from stdin to a temporary file.  Stop./', 512);
-rmdir($tdir);
+    rmdir($tdir);
+}
 }
 
 # This close MUST come at the end of the test!!

tests/scripts/functions/guile

@@ -21,7 +21,8 @@ $details = 'This only works on systems that support it.';
 # If we don't have Guile support, never mind.
 exists $FEATURES{guile} or return -1;
 
-# Guile and Valgrind don't play together at all.
+# Guile and Valgrind/ASAN don't play together at all.
+exists $FEATURES{sanitize} and return -1;
 $valgrind and return -1;
 
 # Verify simple data type conversions

tests/scripts/functions/wildcard

@@ -150,8 +150,9 @@ if ($port_type ne 'W32' && eval { symlink("",""); 1 }) {
 
   # Test for dangling symlinks
   # This doesn't work with the built-in glob... needs to be updated!
+  # It also for some obscure reason, will break if we use ASAN!!
 
-  if (get_config('USE_SYSTEM_GLOB') eq 'yes') {
+  if (get_config('USE_SYSTEM_GLOB') eq 'yes' && !exists($FEATURES{sanitize})) {
     symlink($dir, $lnk);
 
     run_make_test(qq!all: ; \@echo \$(wildcard $lnk)!, '', "$lnk");