# HG changeset patch
# User Bruno Haible <bruno@clisp.org>
# Date 1317939717 -7200
# Node ID 5a6c8b0dc8365af2a26ee1cf204af2c2881202a1
# Parent  bc22a56bfa43163bab050b1d0867642eb8162dfb
fabsf: Drop assumption about library that defines fabsf.

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

diff --git a/ChangeLog b/ChangeLog
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+2011-10-06  Bruno Haible  <bruno@clisp.org>
+
+	fabsf: Drop assumption about library that defines fabsf.
+	* m4/fabsf.m4 (gl_FUNC_FABSF): Use gl_MATHFUNC macro instead of
+	AC_CHECK_FUNCS.
+	* modules/fabsf (Files): Add m4/mathfunc.m4.
+
 2011-10-06  Bruno Haible  <bruno@clisp.org>
 
 	frexpf: Drop assumption about library that defines frexpf.
diff --git a/m4/fabsf.m4 b/m4/fabsf.m4
--- a/m4/fabsf.m4
+++ b/m4/fabsf.m4
@@ -1,4 +1,4 @@
-# fabsf.m4 serial 1
+# fabsf.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_REQUIRE([gl_MATH_H_DEFAULTS])
   AC_REQUIRE([gl_FUNC_FABS])
 
-  dnl Test whether fabsf() exists. Assume that fabsf(), if it exists, is
-  dnl defined in the same library as fabs().
-  save_LIBS="$LIBS"
-  LIBS="$LIBS $FABS_LIBM"
-  AC_CHECK_FUNCS([fabsf])
-  LIBS="$save_LIBS"
-  if test $ac_cv_func_fabsf = yes; then
-    FABSF_LIBM="$FABS_LIBM"
-  else
+  dnl Test whether fabsf() exists. We cannot assume that fabsf(), if it
+  dnl exists, is defined in the same library as fabs(). This is not the case
+  dnl on FreeBSD, NetBSD, OpenBSD.
+  gl_MATHFUNC([fabsf], [float], [(float)])
+  if test $gl_cv_func_fabsf_no_libm = no \
+     && test $gl_cv_func_fabsf_in_libm = no; then
     HAVE_FABSF=0
     FABSF_LIBM="$FABS_LIBM"
   fi
diff --git a/modules/fabsf b/modules/fabsf
--- a/modules/fabsf
+++ b/modules/fabsf
@@ -4,6 +4,7 @@
 Files:
 lib/fabsf.c
 m4/fabsf.m4
+m4/mathfunc.m4
 
 Depends-on:
 math