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, 5 insertions, 0 deletions

diff --git a/extra-lib.mk b/extra-lib.mk
index b10748d185..2552049135 100644
--- a/extra-lib.mk
+++ b/extra-lib.mk
@@ -5,6 +5,9 @@
 # The variable $($(lib)-routines) defines the list of modules
 # to be included in that library.  A sysdep Makefile can add to
 # $(lib)-sysdep_routines to include additional modules.
+#
+# Libraries listed in $(extra-libs-noinstall) are built, but not
+# installed.
 
 lib := $(firstword $(extra-libs-left))
 extra-libs-left := $(filter-out $(lib),$(extra-libs-left))
@@ -28,7 +31,9 @@ extra-objs := $(extra-objs)
 all-$(lib)-routines := $($(lib)-routines) $($(lib)-sysdep_routines)
 
 # Add each flavor of library to the lists of things to build and install.
+ifeq (,$(filter $(lib), $(extra-libs-noinstall)))
 install-lib += $(foreach o,$(object-suffixes-$(lib)),$(lib:lib%=$(libtype$o)))
+endif
 extra-objs += $(foreach o,$(filter-out .os .oS,$(object-suffixes-$(lib))),\
 			$(patsubst %,%$o,$(filter-out \
 					   $($(lib)-shared-only-routines),\