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m4_define([x86_ENABLE_PAE],
[AC_DEFINE([X15_X86_PAE], [1], [use PAE page translation])])
m4_define([x86_SELECT_I386],
[subarch=i386
AS_IF([test x"$enable_x86_pae" = xyes], [x86_ENABLE_PAE])])
m4_define([x86_SELECT_AMD64],
[subarch=amd64
AS_IF([test x"$enable_x86_pae" = xyes],
[AC_MSG_WARN([pae option available for 32-bits builds only, ignoring])])])
m4_define([x86_SELECT],
[arch=x86
AC_ARG_ENABLE([x86-pae],
[AS_HELP_STRING([--enable-x86-pae],
[enable physical address extension (32-bits only)])],
[],
[enable_x86_pae=no])
AS_IF([test -z "$enable_64bits"],
[AS_CASE(["$host_cpu"],
[i?86], [enable_64bits=no],
[x86_64], [enable_64bits=yes])])
AS_IF([test x"$enable_64bits" = xyes], [x86_SELECT_AMD64], [x86_SELECT_I386])
# Never generate instructions that are unhandled in kernel mode
AX_APPEND_COMPILE_FLAGS([ \
-mno-mmx \
-mno-3dnow \
-mno-sse \
-mno-sse2 \
-mno-avx])
AC_DEFINE_UNQUOTED([X15_X86_SUBARCH], [$subarch], [subarch])
AS_ECHO
AC_MSG_NOTICE([target: $arch ($subarch)])
AS_IF([test x"$subarch" = xi386],
[AC_MSG_NOTICE([x86: physical address extension: $enable_x86_pae])])])
AS_CASE(["$host_cpu"],
[i?86|x86_64], [x86_SELECT])
AM_CONDITIONAL([X86], [test x"$arch" = xx86])
AM_CONDITIONAL([X86_64], [test x"$arch" = xx86 -a x"$enable_64bits" = xyes])
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