Remove the "-arch sm_13" option from the NVCCFLAGS.

Users can use NVCCFLAGS when running configure if they need this flag. Plus, this allows the CUDA kernels to work on old NVIDIA cards.

configure.ac

@@ -542,6 +542,8 @@ if test x$enable_cuda = xyes; then
     AC_SUBST(STARPU_CUDA_CPPFLAGS)
 fi
 
+AC_ARG_VAR([NVCCFLAGS], [CUDA compiler flags])
+
 ###############################################################################
 #                                                                             #
 #                                 OpenCL settings                             #

doc/chapters/configuration.texi

@@ -48,6 +48,11 @@ Enable flags for the @code{gcov} coverage tool.
 
 @end table
 
+Additionally, the @command{configure} script recognize many variables, which
+can be listed by typing @code{./configure --help}. For example,
+@code{./configure NVCCFLAGS="-arch sm_13"} adds a flag for the compilation of
+CUDA kernels.
+
 @node Configuring workers
 @subsection Configuring workers
 

examples/Makefile.am

@@ -67,7 +67,7 @@ CLEANFILES += *.gcno *.gcda *.linkinfo
 
 if STARPU_USE_CUDA
 
-NVCCFLAGS += --compiler-options -fno-strict-aliasing  -I$(top_srcdir)/include/ -I$(top_builddir)/include/ -I$(top_srcdir)/examples/  $(HWLOC_CFLAGS) -arch sm_13
+NVCCFLAGS += --compiler-options -fno-strict-aliasing  -I$(top_srcdir)/include/ -I$(top_builddir)/include/ -I$(top_srcdir)/examples/  $(HWLOC_CFLAGS)
 
 .cu.o:
 	$(NVCC) $< -c -o $@ $(NVCCFLAGS)

starpufft/Makefile.am

@@ -57,7 +57,7 @@ am_libstarpufft_@STARPU_EFFECTIVE_VERSION@_la_OBJECTS = cudaf_kernels.o starpuff
 
 if STARPU_HAVE_CUFFTDOUBLECOMPLEX
 cuda_kernels.o: cuda_kernels.cu
-	$(NVCC) $(AM_CPPFLAGS) $< -c -o $@ --compiler-options -fno-strict-aliasing  $(NVCCFLAGS) -I${includedir} -arch sm_13
+	$(NVCC) $(AM_CPPFLAGS) $< -c -o $@ --compiler-options -fno-strict-aliasing  $(NVCCFLAGS) -I${includedir}
 
 libstarpufft_@STARPU_EFFECTIVE_VERSION@_la_SOURCES += cuda_kernels.cu
 am_libstarpufft_@STARPU_EFFECTIVE_VERSION@_la_OBJECTS += cuda_kernels.o