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, 7 insertions, 3 deletions

diff --git a/rt/tst-shm.c b/rt/tst-shm.c
index 36fb9ebcd0..95a4f9b21d 100644
--- a/rt/tst-shm.c
+++ b/rt/tst-shm.c
@@ -199,9 +199,13 @@ do_test (void)
   return (!WIFEXITED (status1) || WEXITSTATUS (status1) != 0
 	  || !WIFEXITED (status2) || WEXITSTATUS (status2) != 0);
 }
-#define TEST_FUNCTION do_test ()
 
-#define CLEANUP_HANDLER shm_unlink ("/glibc-shm-test");
+static void
+cleanup_handler (void)
+{
+  shm_unlink ("/glibc-shm-test");
+}
 
+#define CLEANUP_HANDLER cleanup_handler
 
-#include "../test-skeleton.c"
+#include <support/test-driver.c>