sqrtl: Simplify for platforms where 'long double' == 'double'.

[gnulib.git] / m4 / modff.m4

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