Do not build examples if user did not ask for it

bicatali@gentoo.org

--- Makefile.am.orig	2012-05-29 23:16:20.000000000 +0100
+++ Makefile.am	2012-05-30 00:57:47.000000000 +0100
@@ -28,7 +28,9 @@
 SUBDIRS += socl
 endif
 
+if BUILD_EXAMPLES
 SUBDIRS += examples
+endif
 
 if BUILD_GCC_PLUGIN
 SUBDIRS += gcc-plugin
--- gcc-plugin/Makefile.am.orig	2012-05-29 23:16:20.000000000 +0100
+++ gcc-plugin/Makefile.am	2012-05-30 00:59:39.000000000 +0100
@@ -13,7 +13,10 @@
 #
 # See the GNU Lesser General Public License in COPYING.LGPL for more details.
 
-SUBDIRS = src tests examples
+SUBDIRS = src tests
+if BUILD_EXAMPLES
+SUBDIRS += examples
+endif
 
 EXTRA_DIST = COPYING README ChangeLog
 
--- configure.ac.orig	2012-05-29 23:30:19.000000000 +0100
+++ configure.ac	2012-05-30 01:17:48.000000000 +0100
@@ -1312,6 +1312,11 @@
 #                                                                             #
 ###############################################################################
 
+AC_ARG_ENABLE(build-examples, [AS_HELP_STRING([--enable-build-examples],
+			[enable building of examples])],
+			enable_build_examples=$enableval, enable_build_examples=no)
+# check stuff for examples (todo)
+AM_CONDITIONAL(BUILD_EXAMPLES, [test x$enable_build_examples != xno])
 AC_ARG_ENABLE(opengl-render, [AS_HELP_STRING([--enable-opengl-render],
 			[enable OpenGL rendering of some examples])],
 			enable_opengl_render=$enableval, enable_opengl_render=no)
@@ -1434,6 +1439,11 @@
      if test x$use_system_blas = xyes; then
         AC_DEFINE(STARPU_SYSTEM_BLAS, [1], [use refblas library])
 	blas_lib=system
+     elif test x"$BLAS_LIBS" != x; then
+        AC_DEFINE(STARPU_SYSTEM_BLAS, [1], [use user defined library])
+	STARPU_BLAS_LDFLAGS="$BLAS_LIBS"
+	AC_SUBST(STARPU_BLAS_LDFLAGS)
+	blas_lib=system
      else
 	blas_lib=none
      fi
--- mpi/Makefile.a.origm	2012-05-29 23:16:20.000000000 +0100
+++ mpi/Makefile.am	2012-05-30 01:20:49.000000000 +0100
@@ -94,7 +94,7 @@
 ###################
 # Stencil example #
 ###################
-
+if BUILD_EXAMPLES
 examplebin_PROGRAMS +=				\
 	examples/stencil/stencil5
 
@@ -202,7 +202,7 @@
 
 check_PROGRAMS +=		\
 	examples/reduction/mpi_reduction
-
+endif
 ########################
 # Unit testcases       #
 ########################
--- starpufft/Makefile.am.orig	2012-05-29 23:16:20.000000000 +0100
+++ starpufft/Makefile.am	2012-05-30 01:23:40.000000000 +0100
@@ -67,10 +67,13 @@
 endif
 
 examplebindir = $(libdir)/starpu/examples/starpufft
-examplebin_PROGRAMS =				\
+
+examplebin_PROGRAMS =
+if BUILD_EXAMPLES
+examplebin_PROGRAMS +=				\
 	examples/testf \
 	examples/test
-
+endif
 check_PROGRAMS = examples/testf
 examples_testf_LDADD = libstarpufft-@STARPU_EFFECTIVE_VERSION@.la $(top_builddir)/src/libstarpu-@STARPU_EFFECTIVE_VERSION@.la $(FFTWF_LIBS)