X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Ftanl.m4;h=0e785057fd891b03ff2960454f46a72e25703995;hb=8924d470065e554cb4532df49ba159ffdf8c1b32;hp=8f4ee101ab9e9e7294e9626e2381d562a4d272c3;hpb=73e329f11142c2804e42825e1590041d68dbb6e9;p=gnulib.git

diff --git a/m4/tanl.m4 b/m4/tanl.m4
index 8f4ee101a..0e785057f 100644
--- a/m4/tanl.m4
+++ b/m4/tanl.m4
@@ -1,4 +1,4 @@
-# tanl.m4 serial 1
+# tanl.m4 serial 2
 dnl Copyright (C) 2010 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -56,7 +56,21 @@ AC_DEFUN([gl_FUNC_TANL],
     AC_REQUIRE([gl_FUNC_ISNANL])
     AC_REQUIRE([gl_FUNC_FLOOR])
     AC_REQUIRE([gl_FUNC_FLOORL])
-    TANL_LIBM="$ISNANL_LIBM $FLOOR_LIBM $FLOORL_LIBM"
+    dnl Append $ISNANL_LIBM to TANL_LIBM, avoiding gratuitous duplicates.
+    case " $TANL_LIBM " in
+      *" $ISNANL_LIBM "*) ;;
+      *) TANL_LIBM="$TANL_LIBM $ISNANL_LIBM" ;;
+    esac
+    dnl Append $FLOOR_LIBM to TANL_LIBM, avoiding gratuitous duplicates.
+    case " $TANL_LIBM " in
+      *" $FLOOR_LIBM "*) ;;
+      *) TANL_LIBM="$TANL_LIBM $FLOOR_LIBM" ;;
+    esac
+    dnl Append $FLOORL_LIBM to TANL_LIBM, avoiding gratuitous duplicates.
+    case " $TANL_LIBM " in
+      *" $FLOORL_LIBM "*) ;;
+      *) TANL_LIBM="$TANL_LIBM $FLOORL_LIBM" ;;
+    esac
   fi
   AC_SUBST([TANL_LIBM])
 ])