ELPA_2013.11: Abort in configure step if no kernel set

It is more user friendly if the configure steps aborts in the case
that the user did not define which ELPA kernel to use

ELPA_2013.11/INSTALL

@@ -28,6 +28,8 @@ The configure installation is best done in four steps
    "--with-..." option. For hints which kernels might be best
    for you, please refer to the file 
    "./src/elpa2_kernels/README_elpa2_kernels.txt".
+   If no kernel is specified at the configure step an exception
+   prompting this error is thrown.
 
    Please point to your blacs/scalapack installation and the
    linkline with the variables "BLACS_LDFLAGS" and "BLACS_FCFLAGS".

ELPA_2013.11/configure

@@ -4927,6 +4927,9 @@ fi
+ELPA_KERNEL_SET=no
+
+
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether the generic kernel is specified" >&5
@@ -4955,6 +4958,7 @@ $as_echo "#define WITH_GENERIC 1" >>confdefs.h
 #  elif test "x${with_option}" = xno; then
 #	AC_DEFINE([WITH_GENERIC], [0], [use generic kernel for all architectures (with some hand-coded optimizations)])
+        ELPA_KERNEL_SET=yes
   fi
@@ -4985,6 +4989,7 @@ $as_echo "#define WITH_GENERIC_SIMPLE 1" >>confdefs.h
 #  elif test "x${with_option}" = xno; then
 #	AC_DEFINE([WITH_GENERIC_SIMPLE], [0], [use generic simple kernel for all architectures (without any hand-coded optimizations)])
+        ELPA_KERNEL_SET=yes
   fi
@@ -5015,6 +5020,7 @@ $as_echo "#define WITH_BGP 1" >>confdefs.h
 #  elif test "x${with_option}" = xno; then
 #	AC_DEFINE([WITH_BGP], [0], [use optimized kernel for IBM BG/P])
+        ELPA_KERNEL_SET=yes
   fi
@@ -5045,6 +5051,7 @@ $as_echo "#define WITH_BGQ 1" >>confdefs.h
 #  elif test "x${with_option}" = xno; then
 #	AC_DEFINE([WITH_BGQ], [0], [use optimized kernel for IBM BG/Q])
+        ELPA_KERNEL_SET=yes
   fi
@@ -5075,6 +5082,7 @@ $as_echo "#define WITH_SSE_AS 1" >>confdefs.h
 #  elif test "x${with_option}" = xno; then
 #	AC_DEFINE([WITH_SSE_AS], [0], [use kernel tuned for SSE (written in gcc assembler)])
+        ELPA_KERNEL_SET=yes
   fi
@@ -5105,6 +5113,7 @@ $as_echo "#define WITH_AVX_SANDYBRIDGE 1" >>confdefs.h
 #  elif test "x${with_option}" = xno; then
 #	AC_DEFINE([WITH_AVX_SANDYBRIDGE], [0], [use kernel tuned for AVX on Intel Sandybridge (written in gcc assembler)])
+        ELPA_KERNEL_SET=yes
   fi
@@ -5135,6 +5144,7 @@ $as_echo "#define WITH_AMD_BULLDOZER 1" >>confdefs.h
 #  elif test "x${with_option}" = xno; then
 #	AC_DEFINE([WITH_AMD_BULLDOZER], [0], [use kernel tuned for AVX on AMD Bulldozer (written in gcc assembler)])
+        ELPA_KERNEL_SET=yes
   fi
@@ -5165,6 +5175,7 @@ $as_echo "#define WITH_AVX_COMPLEX_BLOCK1 1" >>confdefs.h
 #  elif test "x${with_option}" = xno; then
 #	AC_DEFINE([WITH_AVX_COMPLEX_BLOCK1], [0], [use AVX optimized complex kernel with blocking 1 (written in gcc assembler)])
+        ELPA_KERNEL_SET=yes
   fi
@@ -5195,6 +5206,7 @@ $as_echo "#define WITH_AVX_COMPLEX_BLOCK2 1" >>confdefs.h
 #  elif test "x${with_option}" = xno; then
 #	AC_DEFINE([WITH_AVX_COMPLEX_BLOCK2], [0], [use AVX optimized complex kernel with blocking 2 (written in gcc assembler)])
+        ELPA_KERNEL_SET=yes
   fi
@@ -5225,6 +5237,7 @@ $as_echo "#define WITH_AVX_REAL_BLOCK2 1" >>confdefs.h
 #  elif test "x${with_option}" = xno; then
 #	AC_DEFINE([WITH_AVX_REAL_BLOCK2], [0], [use AVX optimized real kernel with blocking 2 (written in gcc assembler)])
+        ELPA_KERNEL_SET=yes
   fi
@@ -5255,6 +5268,7 @@ $as_echo "#define WITH_AVX_REAL_BLOCK4 1" >>confdefs.h
 #  elif test "x${with_option}" = xno; then
 #	AC_DEFINE([WITH_AVX_REAL_BLOCK4], [0], [use AVX optimized real kernel with blocking 4 (written in gcc assembler)])
+        ELPA_KERNEL_SET=yes
   fi
@@ -5285,10 +5299,19 @@ $as_echo "#define WITH_AVX_REAL_BLOCK6 1" >>confdefs.h
 #  elif test "x${with_option}" = xno; then
 #	AC_DEFINE([WITH_AVX_REAL_BLOCK6], [0], [use AVX optimized real kernel with blocking 6 (written in gcc assembler)])
+        ELPA_KERNEL_SET=yes
   fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether the user defined an ELPA kernel" >&5
+$as_echo_n "checking whether the user defined an ELPA kernel... " >&6; }
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: ${with_option}" >&5
+$as_echo "${with_option}" >&6; }
+if test "x${ELPA_KERNEL_SET}" = xno; then
+   as_fn_error $? "no ELPA kernel choosen by user! Please look at the manual! Aborting..." "$LINENO" 5
+fi
+
 if test "x${with_avx_sandybridge}" = xyes; then
   check_avx_compilation=yes
 fi

ELPA_2013.11/configure.ac

@@ -27,6 +27,10 @@ AM_PROG_AR
 AM_PROG_AS
 AC_PROG_CXX
 
+
+dnl necessary for later checking
+ELPA_KERNEL_SET=no
+
 dnl  macro for an --with-$2 switch that sets the
 dnl  preprocessor define $1, with description $3, default $4, possible values $5
 AC_DEFUN([DEFINE_OPTION],[
@@ -42,6 +46,7 @@ AC_DEFUN([DEFINE_OPTION],[
 	AC_DEFINE([$1], [1], [$3])
 #  elif test "x${with_option}" = xno; then
 #	AC_DEFINE([$1], [0], [$3])
+        ELPA_KERNEL_SET=yes
   fi
 ])
 
@@ -94,6 +99,13 @@ DEFINE_OPTION([WITH_AVX_REAL_BLOCK6], [avx-real-block6],
 	      [no],[])
 
 
+dnl check whether any kernel was specified
+AC_MSG_CHECKING(whether the user defined an ELPA kernel)
+AC_MSG_RESULT([${with_option}])
+if test "x${ELPA_KERNEL_SET}" = xno; then
+   AC_MSG_ERROR(no ELPA kernel choosen by user! Please look at the manual! Aborting...)
+fi
+
 dnl check whether we better check if AVX compilation should work
 if test "x${with_avx_sandybridge}" = xyes; then
   check_avx_compilation=yes