support: Introduce new subdirectory for test infrastructure

The new test driver in <support/test-driver.c> has feature parity with
the old one.  The main difference is that its hooking mechanism is
based on functions and function pointers instead of macros.  This
commit also implements a new environment variable, TEST_COREDUMPS,
which disables the code which disables coredumps (that is, it enables
them if the invocation environment has not disabled them).

<test-skeleton.c> defines wrapper functions so that it is possible to
use existing macros with the new-style hook functionality.

This commit changes only a few test cases to the new test driver, to
make sure that it works as expected.

1 files changed, 3 insertions, 5 deletions

diff --git a/dirent/opendir-tst1.c b/dirent/opendir-tst1.c
index e96a817398..bb23234623 100644
--- a/dirent/opendir-tst1.c
+++ b/dirent/opendir-tst1.c
@@ -58,7 +58,7 @@ real_test (void)
 
 
 static int
-do_test (int argc, char *argv[])
+do_test (void)
 {
   int retval;
 
@@ -89,8 +89,6 @@ do_cleanup (void)
 {
   remove (tmpname);
 }
-#define CLEANUP_HANDLER do_cleanup ()
+#define CLEANUP_HANDLER do_cleanup
 
-
-/* Include the test skeleton.  */
-#include <test-skeleton.c>
+#include <support/test-driver.c>