modff: Drop assumption about library that defines modff.

* m4/modff.m4 (gl_FUNC_MODFF): Use gl_MATHFUNC macro instead of
AC_CHECK_FUNCS.
* modules/modff (Files): Add m4/mathfunc.m4.

diff --git a/ChangeLog b/ChangeLog
index e3ef62d..6d43b90 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+2011-10-07  Bruno Haible  <bruno@clisp.org>
+
+       modff: Drop assumption about library that defines modff.
+       * m4/modff.m4 (gl_FUNC_MODFF): Use gl_MATHFUNC macro instead of
+       AC_CHECK_FUNCS.
+       * modules/modff (Files): Add m4/mathfunc.m4.
+
 2011-10-07  Bernhard Voelker  <mail@bernhard-voelker.de>
 
        raise tests: Avoid a GCC warning.

diff --git a/m4/modff.m4 b/m4/modff.m4
index 181c406..faf58e3 100644 (file)
--- a/m4/modff.m4
+++ b/m4/modff.m4
@@ -1,4 +1,4 @@
-# modff.m4 serial 1
+# modff.m4 serial 2
 dnl Copyright (C) 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,
@@ -9,15 +9,12 @@ AC_DEFUN([gl_FUNC_MODFF],
   AC_REQUIRE([gl_MATH_H_DEFAULTS])
   AC_REQUIRE([gl_FUNC_MODF])
 
-  dnl Test whether modff() exists. Assume that modff(), if it exists, is
-  dnl defined in the same library as modf().
-  save_LIBS="$LIBS"
-  LIBS="$LIBS $MODF_LIBM"
-  AC_CHECK_FUNCS([modff])
-  LIBS="$save_LIBS"
-  if test $ac_cv_func_modff = yes; then
-    MODFF_LIBM="$MODF_LIBM"
-  else
+  dnl Test whether modff() exists. We cannot assume that modff(), if it
+  dnl exists, is defined in the same library as modf(). This is not the case
+  dnl on FreeBSD, NetBSD, OpenBSD.
+  gl_MATHFUNC([modff], [float], [(float, float *)])
+  if test $gl_cv_func_modff_no_libm = no \
+     && test $gl_cv_func_modff_in_libm = no; then
     HAVE_MODFF=0
     MODFF_LIBM="$MODF_LIBM"
   fi

diff --git a/modules/modff b/modules/modff
index 891b01c..1551213 100644 (file)
--- a/modules/modff
+++ b/modules/modff
@@ -4,6 +4,7 @@ modff() function: get signed integer and fractional parts.
 Files:
 lib/modff.c
 m4/modff.m4
+m4/mathfunc.m4
 
 Depends-on:
 math