configure.ac: move ELPA specific macros into ./m4

The macros which define the functionality to test
for
 - GPU support only (no CPU based kernels)
 - a specific real/complex kernel (not all available kernels)

are now defined in files in the m4 directory

m4/ax_elpa_gpu_version_only.m4

+
+dnl macro for testing whether the user wanted to compile only with the GPU version
+
+dnl usage: DEFINE_OPTION([gpu-support-only],[gpu-support],[with_gpu_support],[install_gpu])
+
+AC_DEFUN([DEFINE_OPTION_GPU_SUPPORT_ONLY],[
+  AC_ARG_WITH([$1],
+               AS_HELP_STRING([--with-$1],
+                              [only compile $2 ]),
+              [with_option=yes],[with_option=no])
+
+  if test x"${with_option}" = x"yes" ; then
+    dnl make sure that all the other kernels are unset
+    install_real_generic=no
+    install_real_generic_simple=no
+    install_real_sse=no
+    install_real_bgp=no
+    install_real_bgq=no
+    install_real_avx_block2=no
+    install_real_avx_block4=no
+    install_real_avx_block6=no
+
+
+    install_complex_generic=no
+    install_complex_generic_simple=no
+    install_complex_sse=no
+    install_complex_bgp=no
+    install_complex_bgq=no
+    install_complex_avx_block1=no
+    install_complex_avx_block2=no
+
+
+    install_gpu=yes
+
+    build_with_gpu_support_only=yes
+    use_specific_complex_kernel=yes
+    use_specific_real_kernel=yes
+    dnl now set the specific kernel
+    $3=yes
+
+    AC_MSG_NOTICE([ELPA will be build only with $1])
+  fi
+])
+

m4/ax_elpa_specific_kernels.m4

+
+dnl macro for testing whether the user wanted to compile only with one
+dnl specific real kernel
+
+dnl usage: DEFINE_OPTION([real-generic-kernel-only],[generic-kernel],[with_real_generic_kernel],[install_real_generic])
+
+AC_DEFUN([DEFINE_OPTION_SPECIFIC_REAL_KERNEL],[
+  AC_ARG_WITH([$1],
+               AS_HELP_STRING([--with-$1],
+                              [only compile $2 for real case]),
+              [with_option=yes],[with_option=no])
+
+   if test x"${with_option}" = x"yes" ; then
+    if test x"${use_specific_real_kernel}" = x"no" ; then
+
+    dnl make sure that all the other kernels are unset
+    install_real_generic=no
+    install_real_generic_simple=no
+    install_real_sse=no
+    install_real_bgp=no
+    install_real_bgq=no
+    install_real_avx_block2=no
+    install_real_avx_block4=no
+    install_real_avx_block6=no
+    install_gpu=no
+
+    use_specific_real_kernel=yes
+    dnl now set the specific kernel
+    $3=yes
+
+    dnl in case of SSE or AVX make sure that we can compile the choosen kernel
+    if test x"${install_real_sse}" = x"yes" ; then
+     if test x"${can_compile_sse}" = x"no" ; then
+       AC_MSG_ERROR([$2 kernel was set, but cannot be compiled!])
+     fi
+    fi
+
+    if test x"${install_real_avx_block2}" = x"yes" ; then
+     if test x"${can_compile_avx}" = x"no" ; then
+       AC_MSG_ERROR([$2 kernel was set, but cannot be compiled!])
+     fi
+    fi
+
+    if test x"${install_real_avx_block4}" = x"yes" ; then
+     if test x"${can_compile_avx}" = x"no" ; then
+       AC_MSG_ERROR([$2 kernel was set, but cannot be compiled!])
+     fi
+    fi
+
+    if test x"${install_real_avx_block6}" = x"yes" ; then
+     if test x"${can_compile_avx}" = x"no" ; then
+       AC_MSG_ERROR([$2 kernel was set, but cannot be compiled!])
+     fi
+    fi
+
+
+    AC_MSG_NOTICE([$1 will be the only compiled kernel for real case])
+    if test x"${want_gpu}" = x"yes" ; then
+      AC_MSG_WARN([At the moment this disables GPU support!])
+      AC_MSG_WARN([IF GPU support is wanted do NOT specify a specific real kernel])
+    fi
+   else
+    AC_MSG_FAILURE([$1 failed; A specific kernel for real case has already been defined before!])
+   fi
+  fi
+])
+
+
+AC_DEFUN([DEFINE_OPTION_SPECIFIC_COMPLEX_KERNEL],[
+  AC_ARG_WITH([$1],
+                 AS_HELP_STRING([--with-$1],
+                                [only compile $2 for complex case]),
+              [with_option=yes],[with_option=no])
+
+   if test x"${with_option}" = x"yes" ; then
+    if test x"${use_specific_complex_kernel}" = x"no" ; then
+
+    dnl make sure that all the other kernels are unset
+    install_complex_generic=no
+    install_complex_generic_simple=no
+    install_complex_sse=no
+    install_complex_bgp=no
+    install_complex_bgq=no
+    install_complex_avx_block1=no
+    install_complex_avx_block2=no
+
+    install_gpu=no
+    use_specific_complex_kernel=yes
+    dnl now set the specific kernel
+    $3=yes
+
+    dnl in case of SSE or AVX make sure that we can compile the choosen kernel
+    if test x"${install_complex_sse}" = x"yes" ; then
+     if test x"${can_compile_sse}" = x"no" ; then
+       AC_MSG_ERROR([$2 kernel was set, but cannot be compiled!])
+     fi
+    fi
+
+    if test x"${install_complex_avx_block1}" = x"yes" ; then
+     if test x"${can_compile_avx}" = x"no" ; then
+       AC_MSG_ERROR([$2 kernel was set, but cannot be compiled!])
+     fi
+    fi
+
+    if test x"${install_complex_avx_block2}" = x"yes" ; then
+     if test x"${can_compile_avx}" = x"no" ; then
+       AC_MSG_ERROR([$2 kernel was set, but cannot be compiled!])
+     fi
+    fi
+
+    AC_MSG_NOTICE([$1 will be the only compiled kernel for real case])
+    if test x"${want_gpu}" = x"yes" ; then
+      AC_MSG_WARN([At the moment this disables GPU support!])
+      AC_MSG_WARN([IF GPU support is wanted do NOT specify a specific complex kernel])
+    fi
+   else
+    AC_MSG_FAILURE([$1 failed; A specific kernel for real case has already been defined before!])
+   fi
+  fi
+])
+