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, 1 insertions, 6 deletions

diff --git a/dlfcn/bug-atexit3-lib.cc b/dlfcn/bug-atexit3-lib.cc
index aba772004d..ed3334709a 100644
--- a/dlfcn/bug-atexit3-lib.cc
+++ b/dlfcn/bug-atexit3-lib.cc
@@ -1,12 +1,7 @@
 #include <unistd.h>
 #include <string.h>
 
-static void
-write_message (const char *message)
-{
-  ssize_t unused __attribute__ ((unused));
-  unused = write (STDOUT_FILENO, message, strlen (message));
-}
+#include <support/support.h>
 
 struct statclass
 {