New make target to only build benchmark binaries

For situations where we are cross-building or where we want to avoid
building on the target system, we want a way to only build benchmarks
and then copy them over to the target system to run them.  I have also
added a simple enhancement for the 'bench' target where all benchmark
binaries are built and then the benchmarks executed.

Tested on arm.

	Makefile.in (bench-build): New target.
	Rules (PHONY): Add bench-build target.
	benchtests/Makefile (bench): Depend on bench-build.
	(bench-build): New target.

ChangeLog

@@ -1,3 +1,10 @@
+2016-04-20  Siddhesh Poyarekar  <sid@reserved-bit.com>
+
+	Makefile.in (bench-build): New target.
+	Rules (PHONY): Add bench-build target.
+	benchtests/Makefile (bench): Depend on bench-build.
+	(bench-build): New target.
+
 2016-04-19  Samuel Thibault  <samuel.thibault@ens-lyon.org>
 
 	* sysdeps/mach/hurd/profil.c (update_waiter): Initialize

Makefile.in

@@ -12,7 +12,7 @@ install:
 	LC_ALL=C; export LC_ALL; \
 	$(MAKE) -r PARALLELMFLAGS="$(PARALLELMFLAGS)" -C $(srcdir) objdir=`pwd` $@
 
-bench bench-clean:
+bench bench-clean bench-build:
 	$(MAKE) -C $(srcdir)/benchtests $(PARALLELMFLAGS) objdir=`pwd` $@
 
 # Convenience target to rebuild ULPs for all math tests.

Rules

@@ -83,7 +83,7 @@ common-generated += dummy.o dummy.c
 
 # This makes all the auxiliary and test programs.
 
-.PHONY: others tests bench
+.PHONY: others tests bench bench-build
 
 ifeq ($(build-programs),yes)
 others: $(addprefix $(objpfx),$(others) $(sysdep-others) $(extra-objs))

benchtests/Makefile

@@ -128,7 +128,10 @@ bench-clean:
 	rm -f $(binaries-bench-malloc) $(addsuffix .o,$(binaries-bench-malloc))
 	rm -f $(timing-type) $(addsuffix .o,$(timing-type))
 
-bench: $(timing-type) $(gen-locales) bench-set bench-func bench-malloc
+bench: $(timing-type) $(gen-locales) bench-build bench-set bench-func \
+	bench-malloc
+# Target to only build the benchmark without running it.
+bench-build: $(binaries-bench) $(binaries-benchset) $(binaries-bench-malloc)
 
 bench-set: $(binaries-benchset)
 	for run in $^; do \