Build system progressing

configure.ac

@@ -1,2 +1,56 @@
-AC_INIT([Grid], [1.0])
+# Process this file with autoconf to produce a configure script.
+AC_PREREQ([2.69])
+AC_INIT([Grid], [1.0], [paboyle@ph.ed.ac.uk])
+AC_CONFIG_MACRO_DIR([m4])
+AC_CONFIG_SRCDIR([Grid.h])
+AC_CONFIG_HEADERS([Grid_config.h])
+
+# Checks for programs.
+AC_PROG_CXX
+AC_OPENMP
+
+# Checks for libraries.
+AX_GCC_VAR_ATTRIBUTE(aligned)
+
+# Checks for header files.
+AC_CHECK_HEADERS(stdint.h)
+AC_CHECK_HEADERS(malloc/malloc.h)
+AC_CHECK_HEADERS(malloc.h)
+
+# Checks for typedefs, structures, and compiler characteristics.
+AC_TYPE_SIZE_T
+AC_TYPE_UINT32_T
+AC_TYPE_UINT64_T
+
+# Checks for library functions.
+AC_CHECK_FUNCS([gettimeofday])
+
+AC_ARG_ENABLE([simd],[AC_HELP_STRING([--enable-simd=AVX|AVX2|SSE|SSE2|AVX512],[Select instructions])],[ac_SIMD=${enable_simd}],[ac_SIMD=AVX2])
+
+case ${ac_SIMD} in
+     SSE)
+       echo Configuring for SSE1
+       AC_DEFINE([SSE],[1],[SSE] )
+     ;;
+     SSE2)
+       echo Configuring for SSE2
+       AC_DEFINE([SSE2],[1],[SSE2] )
+     ;;
+     AVX)
+       echo Configuring for AVX
+       AC_DEFINE([AVX],[1],[AVX] )
+     ;;
+     AVX2)
+       echo Configuring for AVX2
+       AC_DEFINE([AVX2],[1],[AVX2] )
+     ;;
+     AVX512)
+       echo Configuring for AVX512
+       AC_DEFINE([AVX512],[1],[AVX512] )
+     ;;
+     *)
+     AC_MSG_ERROR([${ac_SIMD} unsupported --enable-simd option]); 
+     ;;
+esac
+
 AC_OUTPUT