1dnl $Id: mips-abi.m4 14166 2004-08-26 12:35:42Z joda $
2dnl
3dnl
4dnl Check for MIPS/IRIX ABI flags. Sets $abi and $abilibdirext to some
5dnl value.
6
7AC_DEFUN([AC_MIPS_ABI], [
8AC_ARG_WITH(mips_abi,
9	AS_HELP_STRING([--with-mips-abi=abi],[ABI to use for IRIX (32, n32, or 64)]))
10
11case "$host_os" in
12irix*)
13with_mips_abi="${with_mips_abi:-yes}"
14if test -n "$GCC"; then
15
16# GCC < 2.8 only supports the O32 ABI. GCC >= 2.8 has a flag to select
17# which ABI to use, but only supports (as of 2.8.1) the N32 and 64 ABIs.
18#
19# Default to N32, but if GCC doesn't grok -mabi=n32, we assume an old
20# GCC and revert back to O32. The same goes if O32 is asked for - old
21# GCCs doesn't like the -mabi option, and new GCCs can't output O32.
22#
23# Don't you just love *all* the different SGI ABIs?
24
25case "${with_mips_abi}" in 
26        32|o32) abi='-mabi=32';  abilibdirext=''     ;;
27       n32|yes) abi='-mabi=n32'; abilibdirext='32'  ;;
28        64) abi='-mabi=64';  abilibdirext='64'   ;;
29	no) abi=''; abilibdirext='';;
30         *) AC_MSG_ERROR("Invalid ABI specified") ;;
31esac
32if test -n "$abi" ; then
33ac_foo=krb_cv_gcc_`echo $abi | tr =- __`
34dnl
35dnl can't use AC_CACHE_CHECK here, since it doesn't quote CACHE-ID to
36dnl AC_MSG_RESULT
37dnl
38AC_MSG_CHECKING([if $CC supports the $abi option])
39AC_CACHE_VAL($ac_foo, [
40save_CFLAGS="$CFLAGS"
41CFLAGS="$CFLAGS $abi"
42AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]],[[int x;]])],[eval $ac_foo=yes], [eval $ac_foo=no])dnl
43CFLAGS="$save_CFLAGS"
44])
45ac_res=`eval echo \\\$$ac_foo`
46AC_MSG_RESULT($ac_res)
47if test $ac_res = no; then
48# Try to figure out why that failed...
49case $abi in
50	-mabi=32) 
51	save_CFLAGS="$CFLAGS"
52	CFLAGS="$CFLAGS -mabi=n32"
53	AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]],[[int x;]])],[ac_res=yes],[ac_res=no])dnl
54	CLAGS="$save_CFLAGS"
55	if test $ac_res = yes; then
56		# New GCC
57		AC_MSG_ERROR([$CC does not support the $with_mips_abi ABI])
58	fi
59	# Old GCC
60	abi=''
61	abilibdirext=''
62	;;
63	-mabi=n32|-mabi=64)
64		if test $with_mips_abi = yes; then
65			# Old GCC, default to O32
66			abi=''
67			abilibdirext=''
68		else
69			# Some broken GCC
70			AC_MSG_ERROR([$CC does not support the $with_mips_abi ABI])
71		fi
72	;;
73esac
74fi #if test $ac_res = no; then
75fi #if test -n "$abi" ; then
76else
77case "${with_mips_abi}" in
78        32|o32) abi='-32'; abilibdirext=''     ;;
79       n32|yes) abi='-n32'; abilibdirext='32'  ;;
80        64) abi='-64'; abilibdirext='64'   ;;
81	no) abi=''; abilibdirext='';;
82         *) AC_MSG_ERROR("Invalid ABI specified") ;;
83esac
84fi #if test -n "$GCC"; then
85;;
86esac
87])
88