X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Fisnan.m4;h=dc3e290cd2372b543cfb852707c7935ce17a12be;hb=fba50604716b355a02d023ef5c2f7a7897b07536;hp=9378df815ce9c76dd678dbe5479cd4c50fe7c55d;hpb=3030c5b5e0a5199e16b05927da72c43c42f211c3;p=gnulib.git

diff --git a/m4/isnan.m4 b/m4/isnan.m4
index 9378df815..dc3e290cd 100644
--- a/m4/isnan.m4
+++ b/m4/isnan.m4
@@ -1,5 +1,5 @@
-# isnan.m4 serial 2
-dnl Copyright (C) 2007-2009 Free Software Foundation, Inc.
+# isnan.m4 serial 3
+dnl Copyright (C) 2007-2011 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
@@ -18,7 +18,22 @@ AC_DEFUN([gl_ISNAN],
      && test $gl_func_isnand = yes \
      && test $gl_func_isnanl = yes; then
     AC_MSG_RESULT([yes])
-    ISNAN_LIBM="$ISNANF_LIBM $ISNAND_LIBM $ISNANL_LIBM"
+    ISNAN_LIBM=
+    dnl Append $ISNANF_LIBM to ISNAN_LIBM, avoiding gratuitous duplicates.
+    case " $ISNAN_LIBM " in
+      *" $ISNANF_LIBM "*) ;;
+      *) ISNAN_LIBM="$ISNAN_LIBM $ISNANF_LIBM" ;;
+    esac
+    dnl Append $ISNAND_LIBM to ISNAN_LIBM, avoiding gratuitous duplicates.
+    case " $ISNAN_LIBM " in
+      *" $ISNAND_LIBM "*) ;;
+      *) ISNAN_LIBM="$ISNAN_LIBM $ISNAND_LIBM" ;;
+    esac
+    dnl Append $ISNANL_LIBM to ISNAN_LIBM, avoiding gratuitous duplicates.
+    case " $ISNAN_LIBM " in
+      *" $ISNANL_LIBM "*) ;;
+      *) ISNAN_LIBM="$ISNAN_LIBM $ISNANL_LIBM" ;;
+    esac
   else
     AC_MSG_RESULT([no])
     REPLACE_ISNAN=1