From 1ac9a623b07722e14367dac9284372881aae3934 Mon Sep 17 00:00:00 2001
From: Bruno Haible <bruno@clisp.org>
Date: Mon, 10 Oct 2011 01:04:13 +0200
Subject: [PATCH] ceill: Simplify for platforms where 'long double' ==
 'double'.

* lib/ceill.c: Include <config.h>.
(ceill) [HAVE_SAME_LONG_DOUBLE_AS_DOUBLE]: New function.
* lib/ceil.c [!USE_LONG_DOUBLE]: Don't include <config.h> a second
time.
* m4/ceill.m4 (gl_FUNC_CEILL): Require gl_LONG_DOUBLE_VS_DOUBLE.
Determine CEILL_LIBM according to HAVE_SAME_LONG_DOUBLE_AS_DOUBLE.
* modules/ceill (Depends-on): Add ceil. Update conditions.
---
 ChangeLog     | 11 +++++++++++
 lib/ceil.c    |  4 +++-
 lib/ceill.c   | 21 +++++++++++++++++++--
 m4/ceill.m4   | 14 +++++++++++---
 modules/ceill |  3 ++-
 5 files changed, 46 insertions(+), 7 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 11dc4bb08..909a202b5 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,16 @@
 2011-10-09  Bruno Haible  <bruno@clisp.org>
 
+	ceill: Simplify for platforms where 'long double' == 'double'.
+	* lib/ceill.c: Include <config.h>.
+	(ceill) [HAVE_SAME_LONG_DOUBLE_AS_DOUBLE]: New function.
+	* lib/ceil.c [!USE_LONG_DOUBLE]: Don't include <config.h> a second
+	time.
+	* m4/ceill.m4 (gl_FUNC_CEILL): Require gl_LONG_DOUBLE_VS_DOUBLE.
+	Determine CEILL_LIBM according to HAVE_SAME_LONG_DOUBLE_AS_DOUBLE.
+	* modules/ceill (Depends-on): Add ceil. Update conditions.
+
+2011-10-09  Bruno Haible  <bruno@clisp.org>
+
 	floorl: Simplify for platforms where 'long double' == 'double'.
 	* lib/floorl.c: Include <config.h>.
 	(floorl) [HAVE_SAME_LONG_DOUBLE_AS_DOUBLE]: New function.
diff --git a/lib/ceil.c b/lib/ceil.c
index b30902cbf..4e0354e1c 100644
--- a/lib/ceil.c
+++ b/lib/ceil.c
@@ -16,7 +16,9 @@
 
 /* Written by Bruno Haible <bruno@clisp.org>, 2007.  */
 
-#include <config.h>
+#if ! defined USE_LONG_DOUBLE
+# include <config.h>
+#endif
 
 /* Specification.  */
 #include <math.h>
diff --git a/lib/ceill.c b/lib/ceill.c
index 54a4b50c5..6181c91d4 100644
--- a/lib/ceill.c
+++ b/lib/ceill.c
@@ -16,5 +16,22 @@
 
 /* Written by Bruno Haible <bruno@clisp.org>, 2007.  */
 
-#define USE_LONG_DOUBLE
-#include "ceil.c"
+#include <config.h>
+
+#if HAVE_SAME_LONG_DOUBLE_AS_DOUBLE
+
+/* Specification.  */
+# include <math.h>
+
+long double
+ceill (long double x)
+{
+  return ceil (x);
+}
+
+#else
+
+# define USE_LONG_DOUBLE
+# include "ceil.c"
+
+#endif
diff --git a/m4/ceill.m4 b/m4/ceill.m4
index 40adaf12f..5f56df321 100644
--- a/m4/ceill.m4
+++ b/m4/ceill.m4
@@ -1,4 +1,4 @@
-# ceill.m4 serial 11
+# 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,
@@ -8,8 +8,11 @@ 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>]])
   if test "$ac_cv_have_decl_ceill" = yes; then
@@ -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])
 ])
diff --git a/modules/ceill b/modules/ceill
index 4ab7f3857..a5d860fc2 100644
--- a/modules/ceill
+++ b/modules/ceill
@@ -9,7 +9,8 @@ m4/ceill.m4
 Depends-on:
 math
 extensions
-float           [test $HAVE_DECL_CEILL = 0 || test $REPLACE_CEILL = 1]
+ceil            [{ test $HAVE_DECL_CEILL = 0 || test $REPLACE_CEILL = 1; } && test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 1]
+float           [{ test $HAVE_DECL_CEILL = 0 || test $REPLACE_CEILL = 1; } && test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 0]
 
 configure.ac:
 gl_FUNC_CEILL
-- 
2.11.0