Manual: improve out-of-memory documentation.

[gnulib.git] / m4 / roundl.m4

diff --git a/m4/roundl.m4 b/m4/roundl.m4
index 828103c..f7fe0e8 100644 (file)
--- a/m4/roundl.m4
+++ b/m4/roundl.m4
@@ -1,5 +1,5 @@
-# roundl.m4 serial 3
-dnl Copyright (C) 2007 Free Software Foundation, Inc.
+# roundl.m4 serial 7
+dnl Copyright (C) 2007, 2009-2010 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
@@ -12,18 +12,39 @@ AC_DEFUN([gl_FUNC_ROUNDL],
   AC_CHECK_DECLS([roundl], , , [#include <math.h>])
   if test "$ac_cv_have_decl_roundl" = yes; then
     gl_CHECK_MATH_LIB([ROUNDL_LIBM], [x = roundl (x);])
+    if test "$ROUNDL_LIBM" = missing; then
+      REPLACE_ROUNDL=1
+    fi
+  else
+    HAVE_DECL_ROUNDL=0
   fi
-  if test "$ac_cv_have_decl_roundl" != yes || test "$ROUNDL_LIBM" = missing; then
+  if test $HAVE_DECL_ROUNDL = 0 || test $REPLACE_ROUNDL = 1; then
+    AC_LIBOBJ([roundl])
     AC_CHECK_DECLS([ceill, floorl], , , [#include <math.h>])
-    if test "$ac_cv_have_decl_floorl" = yes &&
-       test "$ac_cv_have_decl_ceill" = yes; then
-      gl_CHECK_MATH_LIB([ROUNDL_LIBM], [x = floorl (x) + ceill (x);])
+    if test "$ac_cv_have_decl_floorl" = yes \
+       && test "$ac_cv_have_decl_ceill" = yes; then
+      gl_FUNC_FLOORL_LIBS
+      gl_FUNC_CEILL_LIBS
+      if test "$FLOORL_LIBM" != '?' && test "$CEILL_LIBM" != '?'; then
+        AC_DEFINE([HAVE_FLOORL_AND_CEILL], [1],
+          [Define if the both the floorl() and ceill() functions exist.])
+        ROUNDL_LIBM=
+        dnl Append $FLOORL_LIBM to ROUNDL_LIBM, avoiding gratuitous duplicates.
+        case " $ROUNDL_LIBM " in
+          *" $FLOORL_LIBM "*) ;;
+          *) ROUNDL_LIBM="$ROUNDL_LIBM $FLOORL_LIBM" ;;
+        esac
+        dnl Append $CEILL_LIBM to ROUNDL_LIBM, avoiding gratuitous duplicates.
+        case " $ROUNDL_LIBM " in
+          *" $CEILL_LIBM "*) ;;
+          *) ROUNDL_LIBM="$ROUNDL_LIBM $CEILL_LIBM" ;;
+        esac
+      else
+        ROUNDL_LIBM=
+      fi
     else
       ROUNDL_LIBM=
     fi
-    HAVE_DECL_ROUNDL=0
-    AC_LIBOBJ([roundl])
   fi
-  AC_SUBST([HAVE_DECL_ROUNDL])
   AC_SUBST([ROUNDL_LIBM])
 ])