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This patch backports the makefile changes related to the support/
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framework.  It is based on upstream commits
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c23de0aacbeaa7a091609b35764bed931475a16d (support: Introduce new
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subdirectory for test infrastructure) and
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76dcbf42df83c970c13c786d287f1ec69e1b91eb (Expose linking against
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libsupport as make dependency).
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The actual contents of the support/ subdirectory is kept in a separate
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patch, so that it can be updated separately.
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diff --git a/Makeconfig b/Makeconfig
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index 1673eea7f2667aae..948c46420193051d 100644
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--- a/Makeconfig
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+++ b/Makeconfig
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@@ -384,6 +384,9 @@ LDFLAGS.so += $(hashstyle-LDFLAGS)
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 LDFLAGS-rtld += $(hashstyle-LDFLAGS)
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 endif
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+# Additional libraries to link into every test.
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+link-extra-libs-tests = $(libsupport)
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+
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 # Command for linking PIE programs with the C library.
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 ifndef +link-pie
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 +link-pie = $(CC) -pie -Wl,-O1 -nostdlib -nostartfiles -o $@ \
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@@ -464,7 +467,7 @@ link-libc-before-gnulib = -Wl,-rpath-link=$(rpath-link) \
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 link-libc = $(link-libc-before-gnulib) $(gnulib)
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 link-libc-tests = $(link-libc-before-gnulib) $(gnulib-tests)
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 # This is how to find at build-time things that will be installed there.
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-rpath-dirs = math elf dlfcn nss nis rt resolv crypt
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+rpath-dirs = math elf dlfcn nss nis rt resolv crypt support
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 rpath-link = \
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 $(common-objdir):$(subst $(empty) ,:,$(patsubst ../$(subdir),.,$(rpath-dirs:%=$(common-objpfx)%)))
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 else
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@@ -732,7 +735,7 @@ libio-include = -I$(..)libio
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 # List of non-library modules that we build.
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 built-modules = iconvprogs iconvdata ldconfig lddlibc4 libmemusage \
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 		libSegFault libpcprofile librpcsvc locale-programs \
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-		memusagestat nonlib nscd extramodules libnldbl
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+		memusagestat nonlib nscd extramodules libnldbl libsupport
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 in-module = $(subst -,_,$(firstword $(libof-$(basename $(@F))) \
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 				    $(libof-$(
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@@ -1022,6 +1025,12 @@ else
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 libm = $(common-objpfx)math/libm.a
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 endif
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+ifeq ($(build-shared),yes)
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+libsupport = $(common-objpfx)support/libsupport_nonshared.a
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+else
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+libsupport = $(common-objpfx)support/libsupport.a
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+endif
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+
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 # These are the subdirectories containing the library source.  The order
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 # is more or less arbitrary.  The sorting step will take care of the
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 # dependencies.
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@@ -1029,7 +1038,7 @@ all-subdirs = csu assert ctype locale intl catgets math setjmp signal	    \
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 	      stdlib stdio-common libio malloc string wcsmbs time dirent    \
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 	      grp pwd posix io termios resource misc socket sysvipc gmon    \
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 	      gnulib iconv iconvdata wctype manual shadow gshadow po argp   \
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-	      crypt nss localedata timezone rt conform debug		    \
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+	      crypt nss localedata timezone rt conform debug support	    \
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 	      $(add-on-subdirs) dlfcn elf
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 ifndef avoid-generated
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diff --git a/Rules b/Rules
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index 25a16d1a4f001a95..b18fb12b1711c0fc 100644
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--- a/Rules
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+++ b/Rules
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@@ -142,6 +142,7 @@ endif
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 ifneq "$(strip $(binaries-shared-tests))" ""
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 $(addprefix $(objpfx),$(binaries-shared-tests)): %: %.o \
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+  $(link-extra-libs-tests) \
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   $(sort $(filter $(common-objpfx)lib%,$(link-libc))) \
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   $(addprefix $(csu-objpfx),start.o) $(+preinit) $(+postinit)
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 	$(+link-tests)
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@@ -163,6 +164,7 @@ endif
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 ifneq "$(strip $(binaries-static-tests))" ""
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 $(addprefix $(objpfx),$(binaries-static-tests)): %: %.o \
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+  $(link-extra-libs-tests) \
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   $(sort $(filter $(common-objpfx)lib%,$(link-libc-static-tests))) \
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   $(addprefix $(csu-objpfx),start.o) $(+preinit) $(+postinit)
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 	$(+link-static-tests)
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diff --git a/extra-lib.mk b/extra-lib.mk
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index af1d6fc888f43d1c..6b87e52db3666cca 100644
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--- a/extra-lib.mk
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+++ b/extra-lib.mk
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@@ -5,6 +5,9 @@
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 # The variable $($(lib)-routines) defines the list of modules
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 # to be included in that library.  A sysdep Makefile can add to
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 # $(lib)-sysdep_routines to include additional modules.
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+#
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+# Libraries listed in $(extra-libs-noinstall) are built, but not
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+# installed.
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 lib := $(firstword $(extra-libs-left))
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 extra-libs-left := $(filter-out $(lib),$(extra-libs-left))
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@@ -28,7 +31,9 @@ extra-objs := $(extra-objs)
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 all-$(lib)-routines := $($(lib)-routines) $($(lib)-sysdep_routines)
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 # Add each flavor of library to the lists of things to build and install.
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+ifeq (,$(filter $(lib), $(extra-libs-noinstall)))
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 install-lib += $(foreach o,$(object-suffixes-$(lib)),$(lib:lib%=$(libtype$o)))
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+endif
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 extra-objs += $(foreach o,$(filter-out .os .oS,$(object-suffixes-$(lib))),\
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 			$(patsubst %,%$o,$(filter-out \
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 					   $($(lib)-shared-only-routines),\