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m4_define([x86_ENABLE_PAE],
[AC_DEFINE([X86_PAE], [1], [use PAE page translation])
AC_MSG_NOTICE([physical address extension enabled])])
m4_define([x86_SELECT_I386],
[machine=i386
AS_IF([test x"$enable_pae" = xyes], [x86_ENABLE_PAE])])
m4_define([x86_SELECT_AMD64],
[machine=amd64
AS_IF([test x"$enable_pae" = xyes],
[AC_MSG_WARN([pae option available for i386 only, ignoring])])])
m4_define([x86_SELECT],
[arch=x86
AC_ARG_WITH([i386],
[AS_HELP_STRING([--with-i386],
[build for a 32-bit IA-32 machine])],
[opt_i386=$withval],
[opt_i386=no])
AC_ARG_WITH([amd64],
[AS_HELP_STRING([--with-amd64],
[build for a 64-bit AMD64 machine])],
[opt_amd64=$withval],
[opt_amd64=no])
AC_ARG_ENABLE([pae],
[AS_HELP_STRING([--enable-pae],
[enable physical address extension (i386 only)])])
AS_IF([test x"$opt_i386$opt_amd64" = xyesyes],
[AC_MSG_ERROR([select only one of i386 or amd64])],
[test x"$opt_i386$opt_amd64" = xnono],
[AS_CASE(["$host_cpu"],
[i?86], [opt_i386=yes],
[x86_64], [opt_amd64=yes])])
AS_IF([test x"$opt_i386" = xyes], [x86_SELECT_I386],
[test x"$opt_amd64" = xyes], [x86_SELECT_AMD64])
AC_DEFINE_UNQUOTED([X86_MACHINE], [$machine], [machine])
AC_MSG_NOTICE([machine type: $arch ($machine)])])
AS_CASE(["$host_cpu"],
[i?86|x86_64], [x86_SELECT])
AM_CONDITIONAL([X86], [test "$arch" = x86])
AM_CONDITIONAL([I386], [test x"$opt_i386" = xyes])
AM_CONDITIONAL([AMD64], [test x"$opt_amd64" = xyes])
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