Add option to build example programs only on demand.

configure.ac

@@ -848,8 +848,23 @@ AC_ARG_WITH([on-demand-check-programs],
   [with_on_demand_check_programs=no])
 AM_CONDITIONAL([with_on_demand_check_programs],
   [test x$with_on_demand_check_programs = xyes])
-
-
+dnl
+dnl
+dnl add flag to disable automatic creation of example programs
+AC_ARG_WITH([example-programs],
+  [AS_HELP_STRING([--without-example-programs],
+     [only build example programs when calling make examples in examples directory (default: build during make all)])],
+  [AS_CASE([$withval],
+     [yes|no],,
+     [n],[with_example_programs=no],
+     [y],[with_example_programs=yes],
+     [AC_MSG_FAILURE([unexpected value for --with-example-programs: '$withval'])])],
+  [with_example_programs=yes])
+AM_CONDITIONAL([with_example_programs],
+  [test x$with_example_programs = xyes])
+dnl
+dnl
+dnl
 AR="${AR:-ar}"
 ARFLAGS="${ARFLAGS:-cru}"
 AC_SUBST([AR])

example/Makefile.am

@@ -28,18 +28,24 @@
 # NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 # SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #
-noinst_PROGRAMS = show_ieee_emulation \
+EXTRA_PROGRAMS = show_ieee_emulation \
 	check_prng \
 	check_prng_f \
 	graph_build
 
+noinst_PROGRAMS =
+if with_example_programs
+noinst_PROGRAMS += $(EXTRA_PROGRAMS)
+endif
+examples: $(EXTRA_PROGRAMS)
+
 makef90depend_ignore_args = \
 	--ignore-module=ieee_arithmetic \
 	--ignore-module=iso_c_binding \
 	--ignore-module=omp_lib
 
 if USE_METIS
-noinst_PROGRAMS += \
+EXTRA_PROGRAMS += \
 	graph_partition
 else
 makef90depend_ignore_args += --ignore-module=ppm_graph_partition_serial