test for mips abi

git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@4882 ec53bebd-3082-4978-b11e-865c3cabbd6b

cf/mips-abi.m4

@@ -0,0 +1,81 @@
+dnl $Id$
+dnl
+dnl
+dnl Check for MIPS/IRIX ABI flags. Sets $abi and $abilibdirext to some
+dnl value.
+
+AC_DEFUN(AC_MIPS_ABI, [
+AC_ARG_WITH(mips_abi,
+[  --with-mips-abi=abi     ABI to use for IRIX (32, n32, or 64)])
+
+case "$host_os" in
+irix*)
+with_mips_abi="${with_mips_abi:-default}"
+if test -n "$GCC"; then
+
+# GCC < 2.8 only supports the O32 ABI. GCC >= 2.8 has a flag to select
+# which ABI to use, but only supports (as of 2.8.1) the N32 and 64 ABIs.
+#
+# Default to N32, but if GCC doesn't grok -mabi=n32, we assume an old
+# GCC and revert back to O32. The same goes if O32 is asked for - old
+# GCCs doesn't like the -mabi option, and new GCCs can't output O32.
+#
+# Don't you just love *all* the different SGI ABIs?
+
+case "${with_mips_abi}" in 
+        32|o32) abi='-mabi=32';  abilibdirext=''     ;;
+       n32|yes) abi='-mabi=n32'; abilibdirext='32'  ;;
+        64) abi='-mabi=64';  abilibdirext='64'   ;;
+	no) abi=''; abilibdirext='';;
+         *) AC_ERROR("Invalid ABI specified") ;;
+esac
+if test -n "$abi" ; then
+ac_foo=krb_cv_gcc_`echo $abi | tr =- __`
+AC_CACHE_CHECK([if $CC supports the $abi option], $ac_foo, [
+save_CFLAGS="$CFLAGS"
+CFLAGS="$CFLAGS $abi"
+AC_TRY_COMPILE(,int x;, eval $ac_foo=yes, eval $ac_foo=no)
+CFLAGS="$save_CFLAGS"
+])
+ac_res=`eval echo \\\$$ac_foo`
+if test $ac_res = no; then
+# Try to figure out why that failed...
+case $abi in
+	-mabi=32) 
+	save_CFLAGS="$CFLAGS"
+	CFLAGS="$CFLAGS -mabi=n32"
+	AC_TRY_COMPILE(,int x;, ac_res=yes, ac_res=no)
+	CLAGS="$save_CFLAGS"
+	if test $ac_res = yes; then
+		# New GCC
+		AC_ERROR([$CC does not support the $with_mips_abi ABI])
+	fi
+	# Old GCC
+	abi=''
+	;;
+	-mabi=n32|-mabi=64)
+		if test $with_mips_abi = default; then
+			# Old GCC, default to O32
+			abi=32
+			abilibdirext=''
+		else
+			# Some broken GCC
+			AC_ERROR([$CC does not support the $with_mips_abi ABI])
+		fi
+	;;
+esac
+fi #if test $ac_res = no; then
+fi #if test -n "$abi" ; then
+else
+case "${with_mips_abi}" in
+        32|o32) abi='-32'; abilibdirext=''     ;;
+       n32|default|yes) abi='-n32'; abilibdirext='32'  ;;
+        64) abi='-64'; abilibdirext='64'   ;;
+	no) abi=''; abilibdirext='';;
+         *) AC_ERROR("Invalid ABI specified") ;;
+esac
+fi #if test -n "$GCC"; then
+;;
+esac
+exit
+])