* work around bumm assembly result on linux ppc32, which was claiming

support for 64 bit opcodes

This commit was SVN r9284.

config/ompi_config_asm.m4

@@ -451,7 +451,13 @@ dnl operations (on a long long).
 dnl
 dnl #################################################################
 AC_DEFUN([OMPI_CHECK_POWERPC_64BIT],[
+    if test "$ac_cv_sizeof_long" != "4" ; then
+        # this function should only be called in the 32 bit case
+        AC_MSG_ERROR([CHECK_POWERPC_64BIT called on 64 bit platform.  Internal error.])
+    fi
     AC_MSG_CHECKING([for 64-bit PowerPC assembly support])
+        case $host in
+            *-darwin*)
                 ppc64_result=0
                 if test "$ompi_cv_asm_powerpc_r_reg" = "1" ; then
                    ldarx_asm="        ldarx r1,r1,r1";
@@ -462,6 +468,12 @@ AC_DEFUN([OMPI_CHECK_POWERPC_64BIT],[
         $ldarx_asm],
                     [ppc64_result=1],
                     [ppc64_result=0])
+            ;;
+            *)
+                ppc64_result=0
+            ;;
+        esac
+
     if test "$ppc64_result" = "1" ; then
         AC_MSG_RESULT([yes])
         ifelse([$1],,:,[$1])