X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;ds=inline;f=m4%2Fceill.m4;h=5f56df32125d2b7d7445762888ef7abb56a26bf7;hb=refs%2Ftags%2Fstable%2F20111211;hp=6b56820926e3a4366c7c485c05bff2d2a8e2751b;hpb=e73e42a61d1dbf1a80ba2fd95fef2aa98de6f48b;p=gnulib.git

diff --git a/m4/ceill.m4 b/m4/ceill.m4
index 6b5682092..5f56df321 100644
--- a/m4/ceill.m4
+++ b/m4/ceill.m4
@@ -1,4 +1,4 @@
-# ceill.m4 serial 10
+# ceill.m4 serial 12
 dnl Copyright (C) 2007, 2009-2011 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -8,10 +8,13 @@ AC_DEFUN([gl_FUNC_CEILL],
 [
   m4_divert_text([DEFAULTS], [gl_ceill_required=plain])
   AC_REQUIRE([gl_MATH_H_DEFAULTS])
+  AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE])
+
   dnl Persuade glibc <math.h> to declare ceill().
   AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
+
   dnl Test whether ceill() is declared.
-  AC_CHECK_DECLS([ceill], , , [#include <math.h>])
+  AC_CHECK_DECLS([ceill], , , [[#include <math.h>]])
   if test "$ac_cv_have_decl_ceill" = yes; then
     dnl Test whether ceill() can be used without libm.
     gl_FUNC_CEILL_LIBS
@@ -60,8 +63,13 @@ int main (int argc, char *argv[])
     HAVE_DECL_CEILL=0
   fi
   if test $HAVE_DECL_CEILL = 0 || test $REPLACE_CEILL = 1; then
-    dnl No libraries are needed to link lib/ceill.c.
-    CEILL_LIBM=
+    dnl Find libraries needed to link lib/ceill.c.
+    if test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 1; then
+      AC_REQUIRE([gl_FUNC_CEIL])
+      CEILL_LIBM="$CEIL_LIBM"
+    else
+      CEILL_LIBM=
+    fi
   fi
   AC_SUBST([CEILL_LIBM])
 ])